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jb=yp;gp.createRoot=jb.createRoot,gp.hydrateRoot=jb.hydrateRoot;/** + * @remix-run/router v1.4.0 + * + * Copyright (c) Remix Software Inc. + * + * This source code is licensed under the MIT license found in the + * LICENSE.md file in the root directory of this source tree. + * + * @license MIT + */function nt(){return nt=Object.assign?Object.assign.bind():function(e){for(var t=1;t"u")throw new Error(t)}function ss(e,t){if(!e){typeof console<"u"&&console.warn(t);try{throw new Error(t)}catch{}}}function y_(){return Math.random().toString(36).substr(2,8)}function Hb(e,t){return{usr:e.state,key:e.key,idx:t}}function Kl(e,t,n,r){return n===void 0&&(n=null),nt({pathname:typeof e=="string"?e:e.pathname,search:"",hash:""},typeof t=="string"?ai(t):t,{state:n,key:t&&t.key||r||y_()})}function Li(e){let{pathname:t="/",search:n="",hash:r=""}=e;return n&&n!=="?"&&(t+=n.charAt(0)==="?"?n:"?"+n),r&&r!=="#"&&(t+=r.charAt(0)==="#"?r:"#"+r),t}function ai(e){let t={};if(e){let 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Please remove "+('all child routes from route path "'+c+'".')),g3(a.children,t,u,c)),!(a.path==null&&!a.index)&&t.push({path:c,score:A_(c,a.index),routesMeta:u})};return e.forEach((a,s)=>{var o;if(a.path===""||!((o=a.path)!=null&&o.includes("?")))i(a,s);else for(let l of y3(a.path))i(a,s,l)}),t}function y3(e){let t=e.split("/");if(t.length===0)return[];let[n,...r]=t,i=n.endsWith("?"),a=n.replace(/\?$/,"");if(r.length===0)return i?[a,""]:[a];let s=y3(r.join("/")),o=[];return o.push(...s.map(l=>l===""?a:[a,l].join("/"))),i&&o.push(...s),o.map(l=>e.startsWith("/")&&l===""?"/":l)}function x_(e){e.sort((t,n)=>t.score!==n.score?n.score-t.score:N_(t.routesMeta.map(r=>r.childrenIndex),n.routesMeta.map(r=>r.childrenIndex)))}const k_=/^:\w+$/,S_=3,__=2,E_=1,T_=10,C_=-2,Wb=e=>e==="*";function A_(e,t){let n=e.split("/"),r=n.length;return n.some(Wb)&&(r+=C_),t&&(r+=__),n.filter(i=>!Wb(i)).reduce((i,a)=>i+(k_.test(a)?S_:a===""?E_:T_),r)}function N_(e,t){return e.length===t.length&&e.slice(0,-1).every((r,i)=>r===t[i])?e[e.length-1]-t[t.length-1]:0}function M_(e,t){let{routesMeta:n}=e,r={},i="/",a=[];for(let s=0;s{if(u==="*"){let f=o[d]||"";s=a.slice(0,a.length-f.length).replace(/(.)\/+$/,"$1")}return c[u]=D_(o[d]||"",u),c},{}),pathname:a,pathnameBase:s,pattern:e}}function O_(e,t,n){t===void 0&&(t=!1),n===void 0&&(n=!0),ss(e==="*"||!e.endsWith("*")||e.endsWith("/*"),'Route path "'+e+'" will be treated as if it were '+('"'+e.replace(/\*$/,"/*")+'" because the `*` character must ')+"always follow a `/` in the pattern. To get rid of this warning, "+('please change the route path to "'+e.replace(/\*$/,"/*")+'".'));let r=[],i="^"+e.replace(/\/*\*?$/,"").replace(/^\/*/,"/").replace(/[\\.*+^$?{}|()[\]]/g,"\\$&").replace(/\/:(\w+)/g,(s,o)=>(r.push(o),"/([^\\/]+)"));return e.endsWith("*")?(r.push("*"),i+=e==="*"||e==="/*"?"(.*)$":"(?:\\/(.+)|\\/*)$"):n?i+="\\/*$":e!==""&&e!=="/"&&(i+="(?:(?=\\/|$))"),[new RegExp(i,t?void 0:"i"),r]}function I_(e){try{return decodeURI(e)}catch(t){return ss(!1,'The URL path "'+e+'" could not be decoded because it is is a malformed URL segment. This is probably due to a bad percent '+("encoding ("+t+").")),e}}function D_(e,t){try{return decodeURIComponent(e)}catch(n){return ss(!1,'The value for the URL param "'+t+'" will not be decoded because'+(' the string "'+e+'" is a malformed URL segment. 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Ci=e=>e.join("/").replace(/\/\/+/g,"/"),z_=e=>e.replace(/\/+$/,"").replace(/^\/*/,"/"),B_=e=>!e||e==="?"?"":e.startsWith("?")?e:"?"+e,F_=e=>!e||e==="#"?"":e.startsWith("#")?e:"#"+e;class Vb extends Error{}class $_{constructor(t,n){this.pendingKeysSet=new Set,this.subscribers=new Set,this.deferredKeys=[],He(t&&typeof t=="object"&&!Array.isArray(t),"defer() only accepts plain objects");let r;this.abortPromise=new Promise((a,s)=>r=s),this.controller=new AbortController;let i=()=>r(new Vb("Deferred data aborted"));this.unlistenAbortSignal=()=>this.controller.signal.removeEventListener("abort",i),this.controller.signal.addEventListener("abort",i),this.data=Object.entries(t).reduce((a,s)=>{let[o,l]=s;return Object.assign(a,{[o]:this.trackPromise(o,l)})},{}),this.done&&this.unlistenAbortSignal(),this.init=n}trackPromise(t,n){if(!(n instanceof Promise))return n;this.deferredKeys.push(t),this.pendingKeysSet.add(t);let 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font-weight: 400px; + font-size: 18px; + line-height: 28px; + @media screen and (max-width: 768px) { + margin-block: 6px; + font-size: 13.5px; + line-height: 21px; + } +`,ka=({ordered:e,children:t})=>{switch(e){case!1:return S.jsx(Ff,{ordered:e,children:t});case!0:return S.jsx(Ff,{as:"ol",ordered:e,children:t});default:return S.jsx(Ff,{ordered:e,children:t})}},nh=({children:e})=>S.jsx(iz,{children:e}),az=P.img` + display: block; + max-width: 90%; + margin-block: 32px; + margin-inline: auto; + border-radius: 12px; + @media screen and (max-width: 768px) { + margin-block: 24px; + } +`,rh=({src:e,alt:t})=>S.jsx(az,{src:e,alt:t}),sz=P.blockquote` + margin-inline: 0; + margin-block: 0; + margin-block: 32px; + padding-left: 12px; + border-left: 4px solid #c8c8c8; +`,ih=({children:e})=>S.jsx(sz,{children:e}),oz=P.main` + padding: 64px; +`,lz=` + # Header 1 + ## Header 2 + ### Header 3 + #### Header 4 + ##### Header 5 + ###### Header 6 + + + This text is *italic* _italic_. + + This text is **bold** __bold__. + + This text is ***mix*** ___mix___. + + This text is ~~mix~~ ~~mix~~. + + - - - + + This is a unordered list + + - list 1 + - list 2 + - list 3 + + This is a ordered list + + 1. list 1 + 2. list 2 + 3. list 3 + + > This is a zone + + This is a javascripe code block: \`const hello = 'Hello Word'\` + + ~~~ ts + let num: number = 1 + console.log(num) + ~~~ + +`,cz=()=>S.jsx(oz,{children:S.jsx(kc,{children:lz,remarkPlugins:[Q0],rehypePlugins:[J0],components:{h1:({level:e,children:t})=>S.jsx(Mt,{level:e,children:t}),h2:({level:e,children:t})=>S.jsx(Mt,{level:e,children:t}),h3:({level:e,children:t})=>S.jsx(Mt,{level:e,children:t}),h4:({level:e,children:t})=>S.jsx(Mt,{level:e,children:t}),h5:({level:e,children:t})=>S.jsx(Mt,{level:e,children:t}),h6:({level:e,children:t})=>S.jsx(Mt,{level:e,children:t}),p:({children:e})=>S.jsx(eh,{children:e}),em:({children:e})=>S.jsx(xa,{children:e}),strong:({children:e})=>S.jsx(xa,{type:"bold",children:e}),hr:()=>S.jsx(th,{}),ul:({depth:e,ordered:t,className:n,children:r})=>S.jsx(ka,{depth:e,ordered:t,className:n,children:r}),ol:({depth:e,ordered:t,className:n,children:r})=>S.jsx(ka,{depth:e,ordered:t,className:n,children:r}),li:({children:e})=>S.jsx(nh,{children:e}),img:({src:e,alt:t})=>S.jsx(rh,{src:e,alt:t}),blockquote:({children:e})=>S.jsx(ih,{children:e})}})}),uz=`# Install + +Read the [quick start](https://github.com/xline-kv/Xline/blob/master/doc/quick-start/README.md) for more information about how to start an xline cluster.`,dz=`# Xline API + +The current version of Xline implements some etcd-compatible APIs, such as KV API, Auth API, Watch API and so on. In the next release, we will further implement the remaining etcd APIs ( v0.3 ~ v0.5 ) ，such as Maintenance, Lease, and provide a client in different languages ( v0.6 ~ v0.8 ). Read the [roadmap](https://github.com/datenlord/Xline#roadmap) for more details. + +Since Xline is fully compatible with etcd interfaces, you can use etcdctl to interact with Xline cluster in the current version. etcdctl can be used as described in the documentation. For more information, please refer to the [documentation](https://github.com/etcd-io/etcd/tree/main/etcdctl) on how to use etcdctl. Read the etcd-compatible API validation test report for more details.`,hz=`Xline is a high-performance distributed key-value storage engine for multi-cluster. It can provide unified data management for multi-cluster scenarios, making mutual access, discovery, and modification simple and convenient. It also provides KV interface, Multi-Version Concurrency Control and is compatible with etcd and K8S. + +Xline is the first geo-distributed consistency management service based on CURP(a WAN consensus protocol, read the paper for more details). It addresses the challenges of convergence and consistency across clouds. + +# Architecture + +**An Xline instance consists of the following layers:** + +- Client Layer: Provides a simple and easy-to-use API for clients to use, which can greatly reduce the complexity of using Xline for business. Xline clients in different languages will be implemented in the later release, and currently etcdctl can be used to initiate requests because Xline APIs are compatible with etcd. +- Access Layer: The access layer mainly includes the communication protocol between client to server or server to server. Xline API is based on gRPC protocol. +- CURP Protocol Layer: The CURP protocol layer implements the core algorithm features, such as leader election, log replication, fast-path and slow-path, which are used to ensure data consistency among Xline multi-node and improve service availability. CURP protocol is the cornerstone and highlight of Xline. +- Functional Logic Layer: This layer implements Xline business logic, including the typical KV Server, Auth Server, Lease Server and Watch Server, etc. Client sends requests to Xline Server through the access layer, and Xline Server dispatches the requests to specific servers for execution. +- Storage Layer: This layer contains two components, Index and DB, where Index is based on BTreeMap while DB is mainly responsible for persistent storage of data. At present, Xline is still in the early stage of development, so DB is mainly implemented based on memory. We will introduce persistent storage in the next release. + +![image](/xline-home/docs/Get-Started/image1.png) + +For more information about the Architecture of Xline, read [Xline Architecture Details](/xline-home/#/docs/Xline-Architecture-Details). + +# Xline In 5 Minutes + +1. Download binary from [release](https://github.com/datenlord/Xline/releases) page. +2. Use the following command to start cluster: +~~~bash +$ ./xline --name node1 --cluster-peers 127.0.0.1:2380 127.0.0.1:2381 --self-ip-port 127.0.0.1:2379 --leader-ip-port 127.0.0.1:2379 +$ ./xline --name node2 --cluster-peers 127.0.0.1:2379 127.0.0.1:2381 --self-ip-port 127.0.0.1:2380 --leader-ip-port 127.0.0.1:2379 +$ ./xline --name node3 --cluster-peers 127.0.0.1:2379 127.0.0.1:2380 --self-ip-port 127.0.0.1:2381 --leader-ip-port 127.0.0.1:2379 +~~~ +3. Download or build etcdctl from [etcd](https://github.com/etcd-io/etcd) project. +4. Use etcdctl to operate the cluster: +~~~bash +$ etcdctl --endpoints=http://127.0.0.1:2379 put foo bar +$ etcdctl --endpoints=http://127.0.0.1:2379 get foo +~~~`,fz=`# Performance Comparison + +We compare Xline with ETCD in a simulated multi-cluster environment. The details of the deployment are shown below. + +![image](/xline-home/docs/Deploy/image1.png) + +We compare the performance with two different workloads. One is 1 key case, the other is 100k key space case. Here is the test result. + +![image](/xline-home/docs/Deploy/xline-key-perf.png)`,pz=`# v0.1.0 + +#### What is it? + +\`Xline\` is a geo-distributed KV store for metadata management, which is based on the \`Curp\` protocol. + +#### Why make it? + +Existing distributed KV stores mostly adopt the \`Raft\` consensus protocol, which takes two RTTs to complete a request. When deployed in a single data center, the latency between nodes is low, so it will not have a big impact on performance. However, when deployed across data centers, the latency between nodes may be tens or hundreds of milliseconds, at which point the \`Raft\` protocol will become a performance bottleneck. The \`Curp\` protocol is designed to solve this problem. It can reduce one RTT when commands do not conflict, thus improving performance. + +#### What does it provide? + +- Etcd Compatible API + - \`Kv\` service + - \`Watch\` service + - \`Auth\` service +- basic implementation of the \`Curp\` protocol +- basic \`Xline\` client (use \`Curp\` directly) +- benchmark tool + +#### Usage + +[Usage doc](https://github.com/datenlord/Xline/blob/v0.1.0/USAGE.md) + +#### Note + +In this release, we only provide binary files for X86_64 linux. Other platforms need to be compiled by yourself. we will add more support in the future. + +#### Links + +GitHub: https://github.com/datenlord/Xline +Paper of Curp: https://www.usenix.org/system/files/nsdi19-park.pdf + +# v0.2.0 + +#### Features: + +- Enable Xline to boot up from the config file xline_server.conf ([#145](https://github.com/datenlord/Xline/pull/145)) +- Support ETCD APIs, like the lease API and the lock API ([#142](https://github.com/datenlord/Xline/pull/145), [#153](https://github.com/datenlord/Xline/pull/145)) +- Enable the recovery mechanism in the CURP module ([#146](https://github.com/datenlord/Xline/pull/145)) +- Add ETCD APIs compatibility test (test report: (report)[./VALIDATION_REPORT.md]) + +#### Fix Bugs + +- Fix panic in the benchmark ([#123](https://github.com/datenlord/Xline/pull/123)) +- Fix the issue that modifies kv pairs will fail after watching them in etcdctl ([#148](https://github.com/datenlord/Xline/pull/123)) + +# v0.3.0 + +#### Features: + +Implement a persistent storage layer to enable durability, including: +Implement a storage engine layer to abstract the concrete storage engine, like rocksdb, +and enable upper layer storage function ([#185](https://github.com/datenlord/Xline/pull/185), [#187](https://github.com/datenlord/Xline/pull/187)) +Enable recover logic for curp and xline ([#194](https://github.com/datenlord/Xline/pull/194), [#184](https://github.com/datenlord/Xline/pull/194)) + +#### Fix Bugs: + +Fix concurrent cmd order bug ([#197](https://github.com/datenlord/Xline/issues/197)) + +# v0.4.0 + +#### Features： + +1. Introduce batching mechanism to improve network bandwidth utilization +2. Implement the snapshot feature for CURP consensus protocol, +3. Implement the snapshot relevant API，which is compatible with etcdctl. The rest of other APIs in etcdctl maintenance will be implemented in the future. + +#### Fix Bugs： + +1. Fix a bug that commands will execute out of order in some concurrent cases (issue [#197](https://github.com/datenlord/Xline/issues/197)), resolve in the pr [#195](https://github.com/datenlord/Xline/issues/195) +2. Fix a bug that the gc task will panic during benchmark(issue [#206](https://github.com/datenlord/Xline/issues/206)), resolve in the pr [#210](https://github.com/datenlord/Xline/issues/210) +3. Fix a bug that the lock feature will work abnormally in some cases(issue [#209](https://github.com/datenlord/Xline/issues/209)), resolve in the pr [#212](https://github.com/datenlord/Xline/issues/212) +4. Fix a bug that some concurrent put requests will get wrong revisions (issue [#209](https://github.com/datenlord/Xline/issues/212)), resolve in the pr [#238](https://github.com/datenlord/Xline/issues/238) + +#### Benchmark: + +Since we implemented the persistence feature for xline in v0.3.0, we have re-benchmarked xline in this release. The benchmark report can be viewed in the Performance Comparison section in our README file. + +# v0.4.1 + +#### Features + +- Watch Progress Notify [#309](https://github.com/datenlord/Xline/issues/309) + +#### Refactors + +- Sharing state between CurpServer and CurpClient [#299](https://github.com/datenlord/Xline/issues/299) +- Refactor the XlineServer [#293](https://github.com/datenlord/Xline/issues/293) +- Refactor curp fast read implementation [#270](https://github.com/datenlord/Xline/issues/270) +- Improve the read and write logic for the RocksSnapshot [#263](https://github.com/datenlord/Xline/issues/263) +- Refactor the watch server implementation [#253](https://github.com/datenlord/Xline/issues/253) +- Refactor the dependencies of lease server [#251](https://github.com/datenlord/Xline/issues/251) + +#### Fix Bugs + +- Test_kv_authorization block [#291](https://github.com/datenlord/Xline/issues/291) +- The background command workers will panic in the integration test "recovery_after_compaction" [#285](https://github.com/datenlord/Xline/issues/285) +- Handle_propose in raw_cup will panic when try notify events [#280](https://github.com/datenlord/Xline/issues/280) +- Watch prev_kv [#277](https://github.com/datenlord/Xline/issues/277) + +# v0.5.0 + +#### Features： + +- [Feature]: Implemented the Compact feature, which includes the following two aspects (Read issue [#188](https://github.com/xline-kv/Xline/issues/188) for more details about compaction design): + - Implemented historical version compaction feature. The compaction API is compatible with the etcd interface. Resolved in pr [#311](https://github.com/xline-kv/Xline/pull/311) + - Implemented an automatic compaction mode, supporting both periodic Strategy and Revision Strategy. It is not enabled by default. Resolved in pr [#401](https://github.com/xline-kv/Xline/pull/401) +- [Feature]: Implement a Rust SDK for the Xline client (xline-client crate) to fully leverage the performance of CURP protocol. Currently, the SDK covers functionalities: + - Watch: Implemented in pr #[321](https://github.com/xline-kv/Xline/pull/321) + - Kv: Implemented in pr #[318](https://github.com/xline-kv/Xline/pull/318) + - Maintenance: Implemented in pr #[323](https://github.com/xline-kv/Xline/pull/323) + - Auth: Implemented in pr #[320](https://github.com/xline-kv/Xline/pull/320) + - Lease: Implemented in pr #[319](https://github.com/xline-kv/Xline/pull/319) + - Lock: Implemented in pr #[322](https://github.com/xline-kv/Xline/pull/322) + - Compaction: Implemented in pr #[389](https://github.com/xline-kv/Xline/pull/389) +- [Feature]: Implement a command line tool for Xline, which is named xlinectl. Resolved in pr #[348](https://github.com/xline-kv/Xline/pull/348) +- [Feature]: Support single node cluster #[335](https://github.com/xline-kv/Xline/issues/335) +- [Feature]: Support multiplatform for Xline. Read #[doc](https://github.com/xline-kv/Xline/tree/master/doc/quick-start) for more details. +- [Feature]: Support dns resolution for Xline cluster #[351](https://github.com/xline-kv/Xline/issues/351) +- [Feature]: Support grpc health checking protocol, resolved in pr #[385](https://github.com/xline-kv/Xline/pull/385) +- [Feature]: Add madsim simulation in Curp tests #[282](https://github.com/xline-kv/Xline/issues/282) + +#### Fix Bugs + +- [Bug]: Madsim Curp integration tests sometimes fail #[361](https://github.com/xline-kv/Xline/issues/361) +- [Bug]: lease may not synced in lease server #[343](https://github.com/xline-kv/Xline/issues/343) +- [Bug]: EventListener will lose event since it's not cancellation safe. #[339](https://github.com/xline-kv/Xline/issues/339) +- [Bug]: Resolve failing tests related to serialized size. #[259](https://github.com/xline-kv/Xline/issues/259) + +#### Contributors + +We'd like to thank all the contributors who worked on this release! + +[@liubog2008](https://github.com/liubog2008) + +# v0.6.0 + +#### New Features + +- [Feature]: Add membership change mechanism for CUPR consensus Protocol (Read design doc [#306](https://github.com/xline-kv/Xline/issues/306) for more details) +- [Feature]: Implement cluster server and client [#464](https://github.com/xline-kv/Xline/pull/464), [#465](https://github.com/xline-kv/Xline/pull/465) +- [Feature]: Implement the graceful shutdown feature. +- [Feature]: Implement the xlinctl to communicate with the xline cluster. Currently, the xlinectl covers functionalities: + - Compaction and member command: Implemented in pr [#484](https://github.com/xline-kv/Xline/pull/484) + - Txn, watch and lock command: Implemented in pr [#428](https://github.com/xline-kv/Xline/pull/484) + - Role command: Implemented in pr [#427](https://github.com/xline-kv/Xline/pull/427) + - User command: Implemented in pr [#426](https://github.com/xline-kv/Xline/pull/426) + - Snapshot and auth command: Implemented in pr [#425](https://github.com/xline-kv/Xline/pull/425) + - Delete and lease command: Implemented in pr [#424](https://github.com/xline-kv/Xline/pull/424) + +#### Bug Fixes + +- [Bug]: benchmark client cannot connect to server [#462](https://github.com/xline-kv/Xline/pull/462) +- [Bug]: remove stop in simulation tests [#458](https://github.com/xline-kv/Xline/pull/458) +- [Bug]: execute out of order [#454](https://github.com/xline-kv/Xline/pull/454) +- [Bug]: check the password on leader [#435](https://github.com/xline-kv/Xline/pull/435) +- [Bug]: remove recovery of uncommitted pool [#419](https://github.com/xline-kv/Xline/pull/419) +- [Bug]: CURP TLA+ quorum size calculation & property check [#418](https://github.com/xline-kv/Xline/pull/418) +- [Bug]: fix propose doesn't handle SyncedError [#407](https://github.com/xline-kv/Xline/pull/407) + +#### Refactor + +- [Refactor]: reduce code duplication [#407](https://github.com/xline-kv/Xline/pull/407) +- [Refactor]: Take into account the interleaving states of a request broadcast in TLA+ [#429](https://github.com/xline-kv/Xline/pull/429) +- [Refactor]: Refine the bench client implementation [#496](https://github.com/xline-kv/Xline/pull/496) +- [Refactor]: Simplified the error handling logic [#480](https://github.com/xline-kv/Xline/pull/480) +- [Refactor]: Improve readability of bootstrap errors [#432](https://github.com/xline-kv/Xline/pull/432) +- [Refactor]: Imporve command serialization in execution and after-sync [#421](https://github.com/xline-kv/Xline/pull/421), [#422](https://github.com/xline-kv/Xline/pull/422) + +#### Contributors + +- [@EAimTY](https://github.com/EAimTY) +- [@MarkGaox](https://github.com/MarkGaox) +- [@Kikkon](https://github.com/Kikkon) + +Note： +Known issue: If the cluster is shut down immediately after adding a member, the leader node may not shut down properly, continuously trying to send entries to the shut-down new node. Read issue [#526](https://github.com/xline-kv/Xline/issues/526) for more details. +`,mz=`# Xline Architecture Details + +![image](/xline-home/docs/Xline-Architecture-Details/image1.jpg)`,gz="/xline-home/assets/dropdown-close-533c3c65.svg",yz="/xline-home/assets/dropdown-active-7d279a33.svg",bz=P.div` + height: 10px; + width: 10px; + margin-inline: 8px; + border-radius: 50%; + background: ${e=>e.theme.color.neutral.gray05}; +`,M5=P.li` + display: flex; + align-items: center; + margin-bottom: ${e=>e.theme.scale.scale03}; +`,vz=P(M5)` + display: ${e=>e.isActive?"flex":"none"}; + padding-left: 14px; +`,wz=P.div` + display: inline-block; + padding-inline: 8px; + height: 100%; +`,q4=P.img` + width: 12px; + height: 12px; +`,R5=P.p` + color: ${e=>e.theme.color.neutral.gray10}; + font-weight: ${e=>e.theme.font.fontWeightBold}; + font-size: 16px; + line-height: 18px; + cursor: pointer; +`,xz=P(R5)` + font-weight: ${e=>e.theme.font.fontWeightRegular}; + cursor: pointer; +`,O5=({item:e})=>S.jsx("ul",{children:e.map(t=>S.jsx(kz,{items:t},t.title))}),kz=({items:e})=>{const[t,n]=ce.useState(!1);return S.jsxs(S.Fragment,{children:[S.jsxs(M5,{onClick:()=>n(!t),children:[S.jsx(wz,{children:t?S.jsx(q4,{src:yz}):S.jsx(q4,{src:gz})}),S.jsx(R5,{children:e.title})]}),S.jsx("ul",{children:S.jsx(Sz,{items:e.children,isActive:t})})]})},Sz=({items:e,isActive:t})=>{const n=ji();return S.jsx(S.Fragment,{children:e.map(r=>S.jsxs(vz,{isActive:t,children:[S.jsx(bz,{}),S.jsx(xz,{onClick:()=>{n(r.url),setTimeout(()=>{const i=document.getElementById(r.id||"");console.log(i),i==null||i.scrollIntoView({behavior:"smooth"})},100)},children:r.title})]},r.id))})},_z=Object.assign({"/src/docs/Deploy.md":uz,"/src/docs/Develop.md":dz,"/src/docs/Get-Started.md":hz,"/src/docs/Performance-Comparison.md":fz,"/src/docs/What's-New.md":pz,"/src/docs/Xline-Architecture-Details.md":mz}),Ez=P.div` + display: flex; 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+ width: 148px; + height: 18px; + } +`,Az=P.main` + display: flex; + margin-inline: auto; + padding-block: ${e=>e.theme.scale.scale05}; + padding-inline: ${e=>e.theme.scale.scale07}; + max-width: ${e=>e.theme.scale.scale12}; + // - - - + /* height: 200px; + background-color: lightcoral; */ + @media screen and (max-width: 1024px) { + padding-block: 36px; + padding-inline: 96px; + } + @media screen and (max-width: 768px) { + padding-block: 24px; + padding-inline: 64px; + } +`,Nz=P.div` + width: 75%; + /* flex: 1; */ + + // - - - + /* min-height: 100px; + background-color: lightcyan; */ + @media screen and (max-width: 1024px) { + width: 100%; + } +`,Mz=P.div` + flex-shrink: 0; + width: 25%; + margin-right: ${e=>e.theme.scale.scale05}; + // - - - + /* height: 100px; + background-color: lightblue; */ + @media screen and (max-width: 1024px) { + display: none; + } +`,Rz=P.p` + margin-bottom: ${e=>e.theme.scale.scale06}; + color: ${e=>e.theme.color.neutral.gray07}; + font-weight: ${e=>e.theme.font.fontWeightBold}; + font-size: ${e=>e.theme.font.fontSize5}; + line-height: ${e=>e.theme.font.lineHeight5}; +`,Oz=()=>{const{params:e}=t1();return ce.useEffect(()=>{e==="Xline-Architecture-Details"&&window.scrollTo(0,0)},[e]),S.jsxs(S.Fragment,{children:[S.jsx(Ez,{children:S.jsxs(Tz,{children:[e==null?void 0:e.split("-").join(" "),S.jsx(Cz,{src:Ra,alt:"underline"})]})}),S.jsxs(Az,{children:[S.jsxs(Mz,{children:[S.jsx(Rz,{children:"Docs"}),S.jsx(O5,{item:K3})]}),S.jsx(Nz,{children:S.jsx(kc,{children:_z[`/src/docs/${e}.md`],remarkPlugins:[Q0],rehypePlugins:[J0],components:{h1:({level:t,children:n})=>S.jsx(Mt,{level:t,children:n}),h2:({level:t,children:n})=>S.jsx(Mt,{level:t,children:n}),h3:({level:t,children:n})=>S.jsx(Mt,{level:t,children:n}),h4:({level:t,children:n})=>S.jsx(Mt,{level:t,children:n}),h5:({level:t,children:n})=>S.jsx(Mt,{level:t,children:n}),h6:({level:t,children:n})=>S.jsx(Mt,{level:t,children:n}),p:({children:t})=>S.jsx(eh,{children:t}),em:({children:t})=>S.jsx(xa,{children:t}),strong:({children:t})=>S.jsx(xa,{type:"bold",children:t}),hr:()=>S.jsx(th,{}),ul:({depth:t,ordered:n,className:r,children:i})=>S.jsx(ka,{depth:t,ordered:n,className:r,children:i}),ol:({depth:t,ordered:n,className:r,children:i})=>S.jsx(ka,{depth:t,ordered:n,className:r,children:i}),li:({children:t})=>S.jsx(nh,{children:t}),img:({src:t,alt:n})=>S.jsx(rh,{src:t,alt:n}),blockquote:({children:t})=>S.jsx(ih,{children:t})}})})]})]})},Iz=`# Basic Concept + +## CAP Theorem and PACELC theorem + +In theoretical computer science, the CAP theorem, also named Brewer's theorem after computer scientist Eric Brewer, states that any distributed data store can provide only two of the following three guarantees: + +- Consistency: Every read receives the most recent write or an error. +- Availability： Every Request receives a (non-error) response, without the guarantee that it contains the most recent write. +- Partition tolerance: The system continues to operate despite an arbitrary number of messages being dropped (or delayed) by the network between nodes. + +To deal with a [network partition](https://en.wikipedia.org/wiki/Network_partition) failure, one of the following options must be chosen: + +- cancel the operation and thus decrease the availability but ensure consistency. +- proceed with the operation and thus provide availability but risk inconsistency. + +Thus, if there is a network partition, one has to choose between consistency or availability. Note that consistency as defined in the CAP theorem is quite different from the consistency guaranteed in [ACID database transactions](https://en.wikipedia.org/wiki/ACID). + +Eric Brewer argues that the often-used "two out of three" concept can be somewhat misleading because system designers need only to sacrifice consistency or availability in the presence of partitions, but that in many systems partitions are rare. The **PACELC theorem** is an extension to the CAP theorem. It states that in case of network partitioning (P) in a distributed computer system, one has to choose between availability (A) and consistency (C) (as per the CAP theorem), but else (E), even when the system is running normally in the absence of partitions, one has to choose between latency (L) and consistency (C). + +Read the following docs for more information: + +1. CAP Theorem： + - Paper: [Brewer's Conjecture and the Feasibility of Consistent Available Partition-Tolerant Web Services](https://users.ece.cmu.edu/~adrian/731-sp04/readings/GL-cap.pdf) + - Blog: [An Illustrated Proof of the CAP Theorem](https://mwhittaker.github.io/blog/an_illustrated_proof_of_the_cap_theorem/) +2. PACELC Theorem(Paper): [Consistency Tradeoffs in Modern Distributed Database System Design](https://www.cs.umd.edu/~abadi/papers/abadi-pacelc.pdf) + +## FLP Impossibility + +The paper "[Impossibility of Distributed Consensus with One Faulty Process](https://groups.csail.mit.edu/tds/papers/Lynch/jacm85.pdf)", published by Fischer, Lynch and Patterson in April 1985, proposed the "FLP Impossibility", specifying an upper bound on what is possible using distributed processes in an asynchronous environment. The consensus problem is solvable in a synchronous environment where processes can proceed simultaneously. The synchronous model allows detecting faults by waiting the entire length of a step for a process to reply, and assuming it has crashed if no reply is received. + +Mechanisms that determine whether a failure has occurred based on how long a reply has been received do not work in a fully asynchronous message-passing distributed system. This is because in an asynchronous environment, there is no upper limit to how long a process can reply to a message after completing its work. Thus, it is impossible to tell whether a process has crashed or has taken a long time to respond. The FLP impossibility shows that in a completely asynchronous system, even if only one node fails, there is no algorithm that can bring the system to consensus. This impossibility comes from the worst-case scheduling scenario, which is unlikely to happen in practice except in adversarial situations, such as an intelligent denial-of-service attacker in the network. In most normal cases, process scheduling has a degree of natural randomness. + +A randomized consensus algorithm can circumvent the FLP Impossibility, achieving security and effectiveness with overwhelming probability, even in the worst case scheduling scenario, such as an intelligent denial-of-service attacker in the network. + +# Consensus Protocol + +## Paxos + +Paxos is a consensus algorithm proposed by Leslie Lamport in 1989. The initial paper was "[The Part-Time Parliament](http://lamport.azurewebsites.net/pubs/pubs.html#lamport-paxos)", but it was not published. Lamport wrote “[Paxos Made Simple](https://lamport.azurewebsites.net/pubs/paxos-simple.pdf)” in 2001 and formally proposed the algorithm. + +Paxos uses proposals to drive the entire algorithm, so that the system resolves to the same proposal. Each node continuously proposes a proposal through messaging, and each proposal includes a proposal number and a proposal value. Paxos considers that if more than half of the nodes in the cluster unanimously accept the proposal, a consensus on the proposal is reached and the proposal is said to be **chosen**. + +Paxos divides the system into the following roles: + +- Client: The client sends a request to the distributed system and waits for a response. +- Proposer: When the proposer receives a request from the client, it makes a relevant proposal, tries to get the receiver to accept the proposal, and coordinates in case of conflict to drive the algorithm to run. +- Acceptor: also called voter, votes to accept or reject the proposer's proposal, and if more than half of the receivers accept the proposal, the proposal is chosen. +- Learners: Learners can only learn the chosen proposal and do not participate in the proposal voting. Once the client's request is unified by the acceptors, the learner can execute the requested operation in the proposal and initiate a response to the client. To improve system availability, multiple learners can be added. + +Paxos represents a family of protocols, including: + +- Basic Paxos: The basic protocol, allowing consensus about a single value. +- Multi Paxos: Allow the protocol to handle a stream of messages with less overhead than Basic Paxos. +- [Cheap Paxos](https://lamport.azurewebsites.net/pubs/web-dsn-submission.pdf): Reduce number of nodes needed via dynamic reconfiguration in exchange for reduced burst fault tolerance. +- [Fast Paxos](https://www.microsoft.com/en-us/research/wp-content/uploads/2016/02/tr-2005-112.pdf): Reduce the number of round trips in exchange for reduced fault tolerance. + +Since Paxos is difficult to understand, algorithms like Raft are designed to be easier to understand. + +## Raft + +In 2013, Diego Ongaro and John Ousterhout of Stanford University published “[In Search of an Understandable Consensus Algorithm with the goal of comprehensibility](https://raft.github.io/raft.pdf)”, formally proposing the Raft algorithm, which aims to optimize the Paxos family of algorithms into a consensus algorithm that is easier to understand and equally satisfying in terms of [safety and liveness](https://en.wikipedia.org/wiki/Safety_and_liveness_properties). + +Raft is similar to Multi-Paxos in that it is a leader-based consensus algorithm. Nodes in the Raft algorithm can only be in one of three states at any given time. + +- Leader: The leader is responsible for handling all client requests and log replication. There can be at most one working leader in the system at the same time. +- Follower: Passively handling requests from the leader. Most of the nodes in the cluster are in this state. +- Candidate: A transitional state between leader and follower, used to elect a new leader. + +Follower persists requests from the leader as log entries as soon as they are received. When a quorum (majority) of nodes confirm that the entry has persisted in their logs, the leader commits the log and followers apply the log entry to its own state machine. When there is a network partition in the system, the partition containing the majority of nodes can still process client requests normally. + +Raft ensures strong consistency of the distributed system through the leader. Raft supports leader election. When the leader crashes, one of the followers is elected as the new leader. Only the follower with more complete logs than the majority of nodes in the cluster can be elected as a leader. From this implementation of leader election, Raft is not a Byzantine fault-tolerant consensus algorithm. Any node can interfere with the cluster by initiating an election and falsely claiming to have the latest logs. + +In addition, there are several optimizations that can be applied to Raft. Prevote can be used to introduce a pre-selection of possible leaders, allowing them to gauge their ability to become leaders before potentially disrupting the cluster. Joint consensus can support arbitrary grouping changes, allowing for better scaling. Batching and pipelining can help high-throughput systems perform better. + +## CURP + +The CURP algorithm was proposed by Seo Jin Park and John Ousterhout of Stanford University in their paper “[Exploiting Commutativity For Practical Fast Replication](https://www.usenix.org/system/files/nsdi19-park.pdf)” published in 2019. + +Traditional approaches to replication, be it Raft or Multi-Paxos, require client requests to be ordered before making them durable by copying them to replica. As a result, clients must wait for two round-trip times (RTTs) before updates complete. The Consistent Unordered Replication Protocol (CURP) allows clients to replicate requests that have not yet been ordered, as long as they are commutative. This strategy allows most operations to complete in 1 RTT. + +CURP supplements a system's existing replication mechanism with a lightweight form of replication without ordering based on witness. A client replicates each operation to one or more witnesses in parallel with sending the request to the primary server. The primary can execute the operation and return to the client without waiting for normal replication, which happens asynchronously. This allows operations to complete in 1 RTT, as long as all witnessed-but-not-yet-replicated operations are commutative. Noncommutative operations still require 2 RTTs. If the primary crashes, information from witnesses is combined with that from the normal replicas to re-create a consistent server state. + +Xline is a distributed key-value store engine which can achieve high-performance data access and strong consistency in cross data center scenarios. The network latency between different data centers is very high, often tens or even hundreds of milliseconds. Ideally, since CURP protocol can save an RTT to reach consensus than Raft or Multi-Paxos does, Xline uses CURP to achieve high-performance data access and strong consistency in cross data center situations. + +Read the [blog](/xline-home/#/blog) for more information about the CURP Protocol.`,Dz=`Key-value stores are used as stand-alone NoSQL systems but they are also used as a part of more complex pipelines and systems such as machine learning and relational systems. + +B-trees and Log-Structured Merge-trees (LSM trees) are two of the most widely used data structures for organizing and storing data in data-intensive applications. However, each of them has its own trade-offs. The purpose of this paper is to compare these two data structures using a quantitative approach. + +# Metrics + +In general, there are three key metrics to measure the performance of a data structure: write amplification, read amplification, and spatial amplification. This section aims to describe these metrics. + +For hard disk drives (HDDs), the cost of disk seek is enormous, such that the performance of random read/write is worse than that of sequential read/write. Therefore, the performance of sequential disk reads and writes is much better than that of random reads and writes. Even for SSDs, sequential read and write performance is better than random read and write. + +## Write Amplification + +Write amplification means that the actual amount of data written to the storage media is greater than the amount of data expected to be written. + +Write amplification occurs because the database itself, in addition to storing data, also needs to store some metadata, such as indexes, wal logs, etc., to improve performance or crash consistency. In addition to metadata, write amplification can also occur on the storage media itself. For example, SSDs have their own garbage collection mechanism that can cause write amplification. Since the lifetime of flash-based storage devices is related to the number of erases, write amplification can reduce the lifetime of flash memory. + +## Read Amplification + +Read amplification is when the amount of data needed to be read per query is greater than the amount of data expected to be read. + +Read amplification occurs because databases often require metadata, such as indexes, to be queried first. The use of caching can reduce read amplification. Also, note that the units of write amplification and read amplification are different. Write amplification measures how much more data is written than the application thinks, while read amplification counts the number of disk reads to execute a query. + +## Space Amplification + +Space amplification is when the data stored in a storage medium is larger than the data stored in a database application + +# LSM Tree And B-Tree + +In the [LSM tree](https://en.wikipedia.org/wiki/Log-structured_merge-tree), data is organized into levels. The data at level 0 resides entirely in memory, while the rest of the levels reside on disk. New records are inserted into level 0. As more data is inserted, when level 0 exceeds a certain size threshold, it is merged into leve 1. If level 1 exceeds a certain size threshold, it is merged into level 2, and so on, with a limit on the size of each level. In order to perform a query on a specific key to get its associated value, a search must be performed in level 0 and also in each level. + +[B-tree](https://en.wikipedia.org/wiki/B-tree) is a self-balancing tree data structure that maintains sorted data and allows searches, sequential access, insertions, and deletions in logarithmic time. The B-tree generalizes the binary search tree, allowing for nodes with more than two children.([2]) Unlike other self-balancing binary search trees, the B-tree is well suited for storage systems that read and write relatively large blocks of data, such as databases and file systems. + +Generally speaking, a data structure can be optimized in at most two ways: read, write, or space amplification. This means that one data structure is unlikely to be better than another in all three. The LSM-tree has a better writer performance than the B+ tree, while its read performance is not as good as the B+ tree. + +LSM Tree has better write performance than B+ Tree because the former has lower write amplification than the latter. B+ Tree indexes require at least two writes of data, one to the WAL and one to the page itself. LSMs can have greater write throughput than B+ Trees partly because they sometimes have lower write amplification (which requires the right configuration) and partly because they write compact SSTable files sequentially. LSM Trees can be compressed well enough to produce smaller files on the disk. The B+ Tree storage engine, on the other hand, generates some space fragmentation due to the paging mechanism. + +The B+ Tree has better read performance compared to the LSM Tree because the former has lower read amplification than the latter. LSM Tree requires reading several different data structures with SSTable during the read process. In addition, since each key of the B tree exists in only one location in the index, the LSM tree storage engine, on the other hand, may have multiple copies of the same key in different segments. This also makes B-trees attractive in databases that need to provide strong transactional semantics, because in most relational databases, transactional isolation is achieved by using locks on key ranges. In a B-tree index, these locks can be attached directly to the tree.`,Lz=`In [distributed computing](https://en.wikipedia.org/wiki/Distributed_computing), a **remote procedure call (RPC)** is when a computer program causes a procedure (subroutine) to execute in a different address space (commonly on another computer on a shared network), which is coded as if it were a normal (local) procedure call, without the programmer explicitly coding the details for the remote interaction. That is, the programmer writes essentially the same code whether the subroutine is local to the executing program, or remote. This is a form of client–server interaction (caller is client, executor is server), typically implemented via a request–response message-passing system. In the object-oriented programming paradigm, RPCs are represented by remote method invocation (RMI). The RPC model implies a level of location transparency, namely that calling procedures are largely the same whether they are local or remote, but usually, they are not identical, so local calls can be distinguished from remote calls. Remote calls are usually orders of magnitude slower and less reliable than local calls, so distinguishing them is important. + +RPCs are a form of [inter-process communication](https://en.wikipedia.org/wiki/Inter-process_communication) (IPC), in that different processes have different address spaces: if on the same host machine, they have distinct virtual address spaces, even though the physical address space is the same; while if they are on different hosts, the physical address space is different. Many different (often incompatible) technologies have been used to implement the concept. + +Read the [protobuf doc](https://protobuf.dev/programming-guides/encoding/) and the [gRPC](https://grpc.io/docs/) doc for more details. + +[tonic]() is a gRPC over HTTP/2 implementation focused on **high performance**, **interoperability**, and **flexibility**. This library was created to have first-class support of async/await and to act as a core building block for production systems written in Rust.`,Pz=`Few can argue against the need for quality control when developing software. Any known or unknown software defects can be very costly for the users of the software. Testing can help developers identify these software defects in advance. The sooner development teams receive feedback from testing, the sooner they can address issues such as: + +- Architectural flaws +- Poor design decisions +- Invalid or incorrect functionality +- Security vulnerabilites +- Scalability issues + +Xline, as a distributed key-value store engine, is designed to run in the presence of many failure scenarios and degraded states, which greatly increases the testing surface. These states also must be tested in addition to the normal testing done on a project. + +In futher sections we’ll investigate how to test distributed systems under the influence of these almost infinite variables. For now, let's examine the basics that every project requires. These simple tests will lay the foundation for many later tests that can be run millions of times throughout the life of a project. + +Often, these tests are written before or alongside the code which they test, and they're used to guide the development process. + +# Unit Testing + +Unit testing is a software development process in which the smallest testable parts of an application, called units, are individually and independently scrutinized for proper operation. This testing methodology is done during the development process by the software developers and sometimes QA staff. + +Xline includes many unit tests that run by cargo test. These tests typically involve simple functionality and are tested using assertions. Many languages, like Rust, offer built-in unit testing functionality: + +~~~rust +#[test] +fn test_parse_members() { + let s1 = ""; + assert!(parse_members(s1).is_err()); + let s2 = "a=1"; + let m2 = HashMap::from_iter(vec![("a".to_owned(), "1".to_owned())]); + assert_eq!(parse_members(s2).unwrap(), m2); + + let s3 = "a=1,b=2,c=3"; + let m3 = HashMap::from_iter(vec![ + ("a".to_owned(), "1".to_owned()), + ("b".to_owned(), "2".to_owned()), + ("c".to_owned(), "3".to_owned()), + ]); + assert_eq!(parse_members(s3).unwrap(), m3); + let s4 = "abcde"; + assert!(parse_members(s4).is_err()); +} +~~~ + +The main objective of unit testing is to isolate written code to test and determine if it works as intended. + +# Mock Testing + +Doing testing is essentially a way to test system or component in a controlled environment. The biggest problem with having a lot of reliance on third-party code is that the third-party code is not controllable. So we need to isolate the tested code and replace the uncontrollable component with a controllable one. That's a so-called mock test. + +mockall is a powerful mock object library for Rust. It provides tools to create mock versions of almost any trait or struct. They can be used in unit tests as a stand-in for the real object. We use mockall to do some mock tests in Xline: + +~~~rust +#[traced_test] +#[tokio::test] +async fn logs_will_be_resent() { + let state = new_test_state(); + + let mut mock_connect = MockConnectInterface::default(); + mock_connect + .expect_append_entries() + .times(4) + .returning(|_, _| Err(ProposeError::RpcStatus("timeout".to_owned()))); + mock_connect + .expect_id() + .return_const(FOLLOWER_ID1.to_owned()); + + let handle = tokio::spawn(async move { + let req = AppendEntriesRequest::new( + 1, + LEADER_ID.to_owned(), + 0, + 0, + vec![LogEntry::new(1, &[Arc::new(TestCommand::default())])], + 0, + ) + .unwrap(); + send_log_until_succeed(1, req, Arc::new(mock_connect), state).await; + }); + sleep_secs(3).await; + assert!(!handle.is_finished()); + handle.abort(); +} +~~~ + +Read the [mock document](https://docs.rs/mockall/0.11.3/mockall/) for more information. + +# Integration Testing + +ntegration tests are often used to ensure that software components or functions operate together properly. + +In Rust, integration tests are entirely external to your library and use your code in the same way any other external code would, using only the public interface and potentially exercising multiple modules per test. It can also exist as documentation. That means it's possible to document your project and benefit from a full test suite simultaneously. + +~~~rust +/// Create a new Xline Server instance with the given config +/// +/// \`\`\`rust +/// let config = if let Ok(path) = env::var("XLINE_SERVER_CONFIG") { +/// fs::read_to_string(&path).await? +/// } else { +/// include_str!("/etc/xline/xline_server.conf").to_owned() +/// }; +/// let xline_server = XlineServer::new(config)?; +/// \`\`\` +struct XlineServer { /*...*/ } +~~~ + +The [Rust Book](https://doc.rust-lang.org/book/ch11-01-writing-tests.html) has a great chapter on how to write tests in Rust, and which testing strategies are appropriate for which problems. + +# Validation Testing + +Since one of the design goals of Xline is to be fully compatible with the etcd API, the validation test is mainly used to test the compatibility of the Xline interface with the etcd client. We used etcdctl to test the compatibility. + +Read the "[Start Xline Servers](https://github.com/datenlord/Xline/blob/master/QUICK_START.md#start-xline-servers)" and "[Send Etcd requests](https://github.com/datenlord/Xline/blob/master/QUICK_START.md#send-etcd-requests)" for more information. + +Read the etcdctl doc for more detail about how to use etcdctl + +Click [here](https://datenlord.feishu.cn/sheets/shtcnTuzElmgDO6NMOlobsCG2Jd) to view the test report.`,zz=Object.assign({"/src/deep-dive/Consensus.md":Iz,"/src/deep-dive/Key-value-Engine.md":Dz,"/src/deep-dive/Remote-Procedure-Calls-(RPC).md":Lz,"/src/deep-dive/Testing.md":Pz}),Bz=P.div` + display: flex; + align-items: center; + justify-content: center; + height: calc(86px + 416px); + padding-top: 86px; + background: #0a0c28; + @media screen and (max-width: 1024px) { + height: calc(63px + 312px); + padding-top: 64.5px; + } + @media screen and (max-width: 768px) { + height: calc(53px + 208px); + padding-top: 43px; + } +`,Fz=P.h1` + position: relative; + display: inline-block; + padding-inline: 32px; + color: white; + font-weight: 700; + font-size: 72px; + /* line-height: 80.64px; */ + line-height: 1.1; + text-transform: capitalize; + transform: translateY(-10%); + @media screen and (max-width: 1024px) { + padding-inline: 24px; + font-size: 54px; + } + @media screen and (max-width: 768px) { + padding-inline: 16px; + font-size: 36px; + } +`,$z=P.img` + z-index: -1; + position: absolute; + left: 50%; + bottom: -17px; + transform: translateX(-45%); + width: 295.01px; + height: 35.35px; + @media screen and (max-width: 1024px) { + bottom: -12px; + width: 222px; + height: 27px; + } + @media screen and (max-width: 768px) { + bottom: -8px; + width: 148px; + height: 18px; + } +`,Uz=P.main` + display: flex; + margin-inline: auto; + padding-block: ${e=>e.theme.scale.scale05}; + padding-inline: ${e=>e.theme.scale.scale07}; + max-width: ${e=>e.theme.scale.scale12}; + // - - - + /* height: 200px; + background-color: lightcoral; */ + @media screen and (max-width: 1024px) { + padding-block: 36px; + padding-inline: 96px; + } + @media screen and (max-width: 768px) { + padding-block: 24px; + padding-inline: 64px; + } +`,jz=P.div` + width: 75%; + /* flex: 1; */ + + // - - - + /* min-height: 100px; + background-color: lightcyan; */ + @media screen and (max-width: 1024px) { + width: 100%; + } +`,qz=P.div` + flex-shrink: 0; + width: 25%; + margin-right: ${e=>e.theme.scale.scale05}; + // - - - + /* height: 100px; + background-color: lightblue; */ + @media screen and (max-width: 1024px) { + display: none; + } +`,Hz=P.p` + margin-bottom: ${e=>e.theme.scale.scale06}; + color: ${e=>e.theme.color.neutral.gray07}; + font-weight: ${e=>e.theme.font.fontWeightBold}; + font-size: ${e=>e.theme.font.fontSize5}; + line-height: ${e=>e.theme.font.lineHeight5}; +`,Wz=()=>{const{params:e}=t1(),t=e==null?void 0:e.split("-").join(" ");return S.jsxs(S.Fragment,{children:[S.jsx(Bz,{children:S.jsxs(Fz,{children:[t==="Testing"?"Test":t,S.jsx($z,{src:Ra,alt:"underline"})]})}),S.jsxs(Uz,{children:[S.jsxs(qz,{children:[S.jsx(Hz,{children:"Deep Dive"}),S.jsx(O5,{item:G3})]}),S.jsx(jz,{children:S.jsx(kc,{children:zz[`/src/deep-dive/${e}.md`],remarkPlugins:[Q0],rehypePlugins:[J0],components:{h1:({level:n,children:r})=>S.jsx(Mt,{level:n,children:r}),h2:({level:n,children:r})=>S.jsx(Mt,{level:n,children:r}),h3:({level:n,children:r})=>S.jsx(Mt,{level:n,children:r}),h4:({level:n,children:r})=>S.jsx(Mt,{level:n,children:r}),h5:({level:n,children:r})=>S.jsx(Mt,{level:n,children:r}),h6:({level:n,children:r})=>S.jsx(Mt,{level:n,children:r}),p:({children:n})=>S.jsx(eh,{children:n}),em:({children:n})=>S.jsx(xa,{children:n}),strong:({children:n})=>S.jsx(xa,{type:"bold",children:n}),hr:()=>S.jsx(th,{}),ul:({depth:n,ordered:r,className:i,children:a})=>S.jsx(ka,{depth:n,ordered:r,className:i,children:a}),ol:({depth:n,ordered:r,className:i,children:a})=>S.jsx(ka,{depth:n,ordered:r,className:i,children:a}),li:({children:n})=>S.jsx(nh,{children:n}),img:({src:n,alt:r})=>S.jsx(rh,{src:n,alt:r}),blockquote:({children:n})=>S.jsx(ih,{children:n})}})})]})]})},I5=`--- + cover: /xline-home/blog/Revisit-the-Consensus-Protocol/cover.png + author: + name: Jicheng Shi + url: https://github.com/rogercloud + img_url: https://avatars.githubusercontent.com/u/939078?v=4 + read_time: 7 +--- + +Revisit-Consensus protocol is a protocol to keep the information consistent and durable in multiple servers. + +--- + +## Introduction of consensus + +Consensus protocol is a protocol to keep the information consistent and durable in multiple servers, and the property is kept even if some servers fail. When we talk about consensus, usually protocols like classic Paxos or Raft come into our minds. They are the foundation of many later invented protocols like Multi-Paxos or Fast-Paxos. Let’s first review these two protocols to see how they work. + +First let’s take a look at Paxos, which is shown in the below graph. Paxos has two phases. The first phase is Prepare, and its main assignment is to take a Slot on the Log. The second phase is Accept, which makes sure this specific Slot has been explicitly occupied, and not taken by others between two phases. When Client receives OK response from the majority of servers, it means this particular record has been submitted and a consensus is reached. Here we can take Client and Proposer as a whole, and there are two messages delivered in the whole process and one message in each phase respectively. + +![image](/xline-home/blog/Revisit-the-Consensus-Protocol/image1.jpg) + +Then let’s move on to talk about Raft, which is also shown below. In Raft protocol a Client sends a request to the leader server, then the leader broadcast the request to all the follower servers. When the leader collects the OK response from the majority of all servers, including itself, a consensus is reached, then it tells the result to Client. There are two messages delivered during the process, one is between Client and the leader, the other is between the leader and the followers. + +![image](/xline-home/blog/Revisit-the-Consensus-Protocol/image2.webp) + +It thus can be told that the above two protocols take two RTTs to complete a request and reach a consensus. It usually does not have a big impact on performance if the protocol runs in a single data center, while the situation is totally different if we run the protocol in multiple data centers. Because the latency between the data-centers is too high, up to hundreds of milliseconds. Therefore, in multi-data center scenarios, it is critical to reduce the number of messages delivered in the process. + +Then, the next question is “Are two phases necessary?”. The answer is yes if we want to keep the following properties: + +1. Any committed request cannot be revised or lost. +2. The order of committed requests cannot be revised or lost.d +3. The order of committed requests cannot be revised or lost.d + +In terms of the protocol that has no leader, like Paxos, one-message delivery can only make sure that the majority learns the message, but the ordering is out of control. And for the protocol that has a leader (e.g., Raft), two messages are also required to duplicate the message to all the servers, as one message can only make sure the leader learns the request. In other words, one-message delivery can only make the leader decide the execution sequence (the 2nd property),but cannot guarantee the committed request will not be lost, since only the leader is entitled to acquire this particular request. + +Then how do we come up with a way to reduce one number of message delivery? The answer is to compromise the second property, which is to abandon the “globally unique execution order” and change it to “guarantee a globally unique execution order for conflicting requests, and irrelevant requests can be executed out of order”. The CURP protocol introduces this idea and partially gives up the second property. Let’s see how CURP works in the next section. + +## CURP protocol + +We won’t discuss all the details of the CURP protocol for it’s too complicated, so only the critical parts will be covered. Here’s the process diagram of the CURP protocol: + +![image](/xline-home/blog/Revisit-the-Consensus-Protocol/image3.webp) + +To start with, let’s describe the main procedures briefly below: + +1. The Client sends a request to all the CURP servers including the master (leader). +2. Every server maintains a waiting pool, which is the blue part in the above graph. The requests in the waiting pool maybe haven’t reached a consensus yet. +3. Once a server receives a request from the Client, it checks if the request conflicts with the requests in the waiting pool. +4. If there’s a conflict, the server rejects the Client request. +5. Otherwise, it accepts the request and let the Client knows. +6. If the Client received no less than (f + (f + 1)/ 2 + 1) Accept replies, including the reply from the master, it knows the request has been committed. Otherwise, Client waits for the master server to duplicate the request to the follower servers. Once the duplication process completes, the request is removed from the waiting pool and the master server tells the Client that the request has been committed. + +It’s not easy to understand the protocol if we only list the above four steps. Let me put it in a question-and-answer format for further explanations. + +**Q1: Why can the Client make sure a request is committed when no less than (f + (f + 1)/ 2 + 1) Accept responses including the reply from the master are received?** + +A1: Because the waiting pool is exclusive as conflict requests won’t be in the same pool at the same time, once a request is accepted by the majority, the other conflict request won’t get the majority vote until the previous one is removed. Even if there’s f server failures, we can easily recover the request from the remaining (f + 1)/ 2 + 1 servers, which are also the majority of the remaining servers. So as a result CURP protocol keeps the committed request and the ordering of the conflicting requests. + +**Q2: The number (f + (f + 1)/ 2 + 1) is strange, why not f + 1?** + +A2: The reason is the recovery procedure requires the number. In the worst case, there are at most f failures, we must find out the committed requests in the waiting pool according to the remaining informed (f + 1)/ 2 + 1 servers, which are the majority of all remaining servers. + +The consensus protocol allows at most f server failures, so the remaining server is f+1. In the worst case, all failed servers contain that request, then the remaining f+1 still have at least (f+1\\_)/2+1 servers containing that particular request, accounting for the vast majority and is convenient for the recovery process to restore the request and prevent any losses. + +**Q3: Do all the requests reach the consensus after one message delivery?** + +A3: It is not guaranteed. If there’s no conflicting request, one message is enough to reach the consensus. Otherwise, in terms of conflicting requests, the Client must wait for the master (leader) server to complete synchronization, which takes another message delivery. Then the Client can confirm that the request is committed. In this case, two messages are delivered, similar to Raft. Therefore, 1RTT for the best case and 2RTT for the worst case. + +**Q4: How does the master duplicate the message to the follower servers?** + +A4: The same as Raft. + +**Q5: What is the recovery process for the CURP protocol?** + +A5: First, the recovery process needs to elect a new master (leader), which is the same as Raft. Then the process can be roughly divided into two modules. For the synchronized request, the recovery process is consistent with the Raft protocol. For the requests that have not been synchronized yet, they need to be collected from all servers. When f+1 servers (including the new leader itself) are collected information, keep the requests that appear at least (f+1)/2+1 times, because these requests may have been committed, thus cannot be lost. + +## Summary + +We find that the CURP protocol is very similar to the Raft protocol except for the waiting pool. The pool is used to keep the ordering of the conflicting requests, making sure there’s at most one request committed among all the conflicts. In other words, all requests need to wait for the synchronization of the master at the time when the pool is sorting conflicting requests. The waiting pool is the root reason for the outperforming result. + +To sum up, under optimal condition, the CURP takes one round of message delivery to reach consensus. In the worst case, it takes two rounds of message delivery to achieve consensus, just as the Raft protocol. + +For more details about the CURP protocol, please refer here to the original paper. + +Xline, an open source project by DatenLord, is a geo-distributed KV store for metadata management, which is based on the CURP protocol. + +GitHub Links: https://github.com/datenlord/Xline +`,D5=`--- + + cover: /xline-home/blog/Thinking-About-Programs-from-Mathematical-Perspective-to-Verify-Their-Correctness/cover.png + author: + name: Ye Tian + url: https://github.com/datenlord + img_url: /xline-home/DatenLord.png + read_time: 13 + +--- + +Thinking About-The purpose of this article is concerning how to think about computer systems and algorithms from a mathematics perspective. + +--- + +The purpose of this article is to provide readers who have not been exposed to formal methods with a new perspective on computer systems and algorithms, rather than formal methods or TLA+ tutorials. Therefore, the focus of this article is how to think about programs from a mathematical perspective, without using a lot of space to explain the syntax of TLA+. + +## How do we write correct programs? + +The goal of programming is always to write correct programs. Our programs become more complex over time, and the errors that may exist in them become more numerous. To write correct programs, we should first understand what errors may occur in our programs. + +### What errors will there be in the program? + +I will roughly divide the errors that may occur in the program into two categories: simple errors and logical errors. + +#### Simple errors + +Simple errors include semantic errors, memory errors, etc. For these easy-to-analyze errors, we already have many mature methods and tools to avoid them, such as compilers, static analysis tools, garbage collector. Because these errors can be relatively easily found and fixed, they are not the focus of our attention. + +#### Logical errors + +Logical errors are the most difficult to find and fix in programs, such as deadlocks, race conditions, data inconsistencies. Logical errors affect the correctness, performance and reliability of the program, and are usually caused by insufficient design of the program. For these errors, we need to analyze and solve them from a higher level, rather than just from the implementation details of the code. + +We usually use some methods to avoid logical errors, such as: + +- **Optimize software architecture design** - Consider the correctness of the program in the design stage +- **Testing** - Use various testing methods to reduce the errors in the program, but it cannot guarantee the complete correctness of the program + +### Experience + +It is not hard to see that the theories above are derived from experience. Experience is accumulated in practice, and we summarize the experience to derive guiding principles, methods and steps that can help us design better programs. + +#### But can we rely only on experience? + +The more experienced people are, the more details and possibilities they can think of, and the systems they design are usually more stable. But we can't just rely on experience: + +- **Experience is limited** - Human experience is limited and unreliable +- **The behavior and state of complex systems are numerous** - A complex system has too many behaviors and states to predict +- **The requirements for correctness of a specific program are very high** - Some programs have very high requirements for correctness, such as financial systems, medical systems, which are difficult to guarantee through experience +- **Unable to verify correctness from theory** - Can only reduce the occurrence of errors as much as possible, but cannot prove the correctness of the program from theory + +Therefore, we need a more rigorous method to guarantee the correctness of the program from the design. + +### Formal methods + +If we can verify the correctness of a program from mathematical perspective, we can solve the above problems. Actually, this is the goal of formal methods. + +Formal methods are based on mathematics, by establishing mathematical models for systems to define the behavior, state, etc. of the system, and then defining the constraints of the system, such as safety, liveness, and finally proving that the model satisfies the formal specification of the system to verify the correctness of the system. For finite-state systems, model checking based on finite-state search can be used to verify the behavior of the system to verify whether the system has the expected properties. For systems with infinite state spaces, deductive verification based on logical inference is used to verify the correctness of the system using induction. + +This article uses the TLA+ language as a tool to introduce formal methods. + +## TLA+ + +Leslie Lamport, the author of TLA+, is a computer scientist who won the Turing Award in 2013 for his groundbreaking work in the field of concurrent and distributed systems. + +### What's TLA+ + +TLA+ is an high-level language for modeling programs and systems - especially concurrent and distributed programs and systems. Its core idea is that the best way to precisely describe things is to use simple mathematics. TLA+ and its tools can be used to eliminate design errors that are difficult to find and correct in code and are expensive to correct. + +TLA+ specifications are not real engineering code and cannot be used in production environments because the goal of TLA+ is to find and solve logical errors at the design stage of the system. In TLA+ we abstract programs as finite-state mathematical models, usually state machines, and then use the TLC Model Checker to exhaustively search all possible states of the program and verify its correctness. + +The following two simple examples introduce TLA+. These two examples are from [Leslie Lamport's The TLA+ Video Course](https://www.youtube.com/playlist?list=PLWAv2Etpa7AOAwkreYImYt0gIpOdWQevD). The goal of this article is to provide a new perspective on computer systems and algorithms for readers who have not been exposed to formal methods, rather than a TLA+ tutorial, so the syntax and use of TLA+ tools will not be discussed in detail. + +### Simple Example + +TLA+ allows us to use simple mathematics to abstract system models, mainly set theory and boolean logic. In the process of abstraction, we need to abandon some implementation details and only focus on the logic of the program itself. + +Here is a simple C program that we try to abstract as a TLA+ program: + +\`\`\`c +int i; +void main() { + i = someNumber(); // someNumber() returns a number between 0 and 1000 + i = i + 1; +} +\`\`\` + +#### State Abstraction + +We need to abstract this program into a series of independent **states**. Obviously, the difference between each state is only the value of \`i\`. Suppose that the default value of \`i\` is 0 after initialization, and that \`someNumber()\` returns 42 when this program is run, then the state transition relationship of this program is: + +[i : 0] -> [i : 42] -> [i : 43] + +There are three states in this, and the difference between each state is that the value of \`i\` is different. + +It seems that the abstraction is complete, but there are problems. Suppose that \`someNumber()\` returns 43 in another run, then the state transition relationship of this program is: + +[i : 0] -> [i : 43] -> [i : 44] + +This is inconsistent with the previous abstraction, because the state transition relationship of the two runs is different. This is because we have not considered the return value of \`someNumber()\`. + +The _state_ of a program refers to the time point when the program is at each stage, not the process of the program running. Therefore, each state is independent, and the transition between states is atomic. This is very different from traditional programming, which is procedural, and TLA+ is state-oriented. We only care about what state the program is currently running in, so we can introduce a new variable \`pc\` to represent which stage the program is running in, so that we can clearly represent the sub-state relationship of the program: + +\`\`\`c +int i; +void main() { + i = someNumber(); // pc = "start" + i = i + 1; // pc = "middle" +} // pc = "done" +\`\`\` + +In this way, we no longer need to consider the value of \`i\`, but only the value of \`pc\`: + +[pc : start] -> [pc : middle] -> [pc : done] + +#### Writing States + +The initial value of \`i\` is 0, and the initial value of \`pc\` is \`start\`, so we can write the sub-state relationship as: + +![image1](/xline-home/blog/Thinking-About-Programs-from-Mathematical-Perspective-to-Verify-Their-Correctness/image1.png) + +In which, for the variable \`i\`, its next state is represented as \`i'\`, which is the way TLA+ defines the state transition of variables. \`i' ∈ 0..1000\` means that the value of \`i\` in the next state is a number between 0 and 1000, that is, \`someNumber()\`, \`0..1000\` represents the set \`{0,1,...,1000}\`. \`∧\` is the logical and in Boolean logic, which can be understood as "and". Finally, the program runs to completion and there is no next state, so it is represented as \`FALSE\`. + +In TLA+ , we write a state. Therefore, it is not "because \`pc = start\` so \`i' ∈ 0..1000\`", in fact, the relationship between the two is parallel: **In this state, the value of \`pc\` is \`start\` and the value of \`i\` in the next state \`∈ 0..1000\`**. With this idea, we can rewrite the above abstraction as: + +![image2](/xline-home/blog/Thinking-About-Programs-from-Mathematical-Perspective-to-Verify-Their-Correctness/image2.png) + +In which, the "or" is used to connect two states, which can be represented by the logical or \`∨\` in Boolean logic. In this way, we can clearly represent the state transition relationship of the program. For the sake of beauty, the same Boolean logic symbol can also be supplemented before the first sentence in TLA+ : + +![image3](/xline-home/blog/Thinking-About-Programs-from-Mathematical-Perspective-to-Verify-Their-Correctness/image3.png) + +We finally get the two states after the initial state of this simple program, and then we will complete the initial state and supplement the entire specification according to the requirements of the TLA+ language: + +![image4](/xline-home/blog/Thinking-About-Programs-from-Mathematical-Perspective-to-Verify-Their-Correctness/image4.png) + +- \`EXTENDS\` is used to introduce modules defined in other specifications, which is mainly used in \`i' ∈ 0..1000\` here. +- \`VARIABLES\` is used to define variables, which are defined as \`i\` and \`pc\` here. +- \`Init\` is used to define the initial state, which is defined as \`i = 0\` and \`pc = "start"\` here. +- \`Next\` is used to define the state transition relationship. + +Now we have a complete TLA+ specification. Later, we can use the TLC Model Checker to check the model, but this is not within the scope of this article. + +For simple systems, modeling with TLA+ cannot bring many benefits. Generally speaking, TLA+ is only used when designing very complex, very critical, and very experience-based systems. Concurrency and distributed systems are usually the fields where TLA+ is used. Let's take a look at an example of a distributed system algorithm: Two-Phase Commit. + +### Two-Phase Commit + +> In transaction processing, databases, and computer networking, the two-phase commit protocol (2PC) is a type of atomic commitment protocol (ACP). It is a distributed algorithm that coordinates all the processes that participate in a distributed atomic transaction on whether to commit or abort (roll back) the transaction. This protocol (a specialised type of consensus protocol) achieves its goal even in many cases of temporary system failure (involving either process, network node, communication, etc. failures), and is thus widely used. —— [Two-phase commit protocol (Wikipedia)](https://en.wikipedia.org/wiki/Two-phase_commit_protocol) + +Lamport explains Two-Phase Commit in the following analogy in [Leslie Lamport's The TLA+ Video Course](https://www.youtube.com/playlist?list=PLWAv2Etpa7AOAwkreYImYt0gIpOdWQevD): + +![image5](/xline-home/blog/Thinking-About-Programs-from-Mathematical-Perspective-to-Verify-Their-Correctness/image5.png) + +In a wedding, the minister is the coordinator, the groom and the bride are the participants. When the groom and the bride both agree to the marriage, the minister will officially announce the marriage. If one of them does not agree, the minister will abort the marriage: + +1. The minister asks the groom: Do you agree to this marriage? +2. The groom answers: I agree (prepared). +3. The minister asks the bride: Do you agree to this marriage? +4. The bride answers: I agree (prepared). +5. The minister announces: The marriage is officially established (committed). + +If one of them does not agree, the minister will abort the marriage. + +In a database, the Transaction Manager is the coordinator (the minister). When the Transaction Manager asks all the participants Resource Managers (the groom / bride), if all the Resource Managers agree to commit the transaction, the Transaction Manager will commit the transaction. If one of them does not agree, the Transaction Manager will abort the transaction. + +The detailed introduction and process of Two-Phase Commit can be found on [Wikipedia](https://en.wikipedia.org/wiki/Two-phase_commit_protocol). + +First, let's define some constants and variables and their initial state: + +![image6](/xline-home/blog/Thinking-About-Programs-from-Mathematical-Perspective-to-Verify-Their-Correctness/image6.png) + +- The constant \`RM\` is the set of all Resource Manager identifiers, for example, it can be set to the set \`{"r1", "r2", "r3"}\`. +- The variable \`rmState\` is used to record the state of each Resource Manager, and \`rmState[r]\` is used to represent the state of \`r\`, which has four states: \`working\`, \`prepared\`, \`committed\`, \`aborted\`. The initial state of each \`RM\` is \`working\`. +- The variable \`tmState\` is used to record the state of the Transaction Manager, which has three states: \`init\`, \`committed\`, \`aborted\`. The initial state is \`init\`. +- The variable \`tmPrepared\` is used to record the Resource Manager that is ready (in the \`prepared\` state). The initial value is an empty set. +- The variable \`msgs\` is used as a message pool to record all messages that are being transmitted. The initial value is an empty set. + +Next, let's define the actions that the system may perform. + +![image7](/xline-home/blog/Thinking-About-Programs-from-Mathematical-Perspective-to-Verify-Their-Correctness/image7.png) + +- In TLA+, expressions similar to the "function" concept in other programming languages can be defined in the above way, so there is no need to define an expression for each Resource Manager. +- \`[type → "prepare", rm → r]\` is a record in TLA+, similar to a struct in other programming languages. +- \`UNCHANGED ⟨rmState, tmState, msgs⟩\` means that this action will not change the values of the variables \`rmState\`, \`tmState\`, \`msgs\`. In TLA+, it is necessary to explicitly declare whether the value of each variable changes or not. + +When the state of \`TM\` is \`init\`, and there is a \`Prepared\` message from \`r\` in the message pool, the value of \`tmPrepared\` in the next state will be the union of \`tmPrepared\` and \`{r}\`. + +![image8](/xline-home/blog/Thinking-About-Programs-from-Mathematical-Perspective-to-Verify-Their-Correctness/image8.png) + +The above two actions are Transaction Manager performing Commit and Abort. + +![image9](/xline-home/blog/Thinking-About-Programs-from-Mathematical-Perspective-to-Verify-Their-Correctness/image9.png) + +The above 4 Resource Manager actions are Resource Manager choosing Prepare and Abort, and handling the Commit and Abort decided by the Transaction Manager. + +The syntax \`rmState' = [rmState except ![r] = "prepared"]\` means "in the next state, the value of \`rmState[r]\` is changed to \`prepared\`, and the other parts remain unchanged". + +If we use a form like \`rmState[r]' = "prepared"\`, we have not explicitly stated the values of the other parts of \`rmState\` in the next state, so it is incorrect. + +TLA+ is different from the programs we usually write, it is mathematics. In programming, we use arrays, and in TLA+, we use functions to express similar concepts, and the set of array indices is the domain of the function. + +After writing all the actions that the system may exist, we can start to deduce the state transition of the system: + +![image10](/xline-home/blog/Thinking-About-Programs-from-Mathematical-Perspective-to-Verify-Their-Correctness/image10.png) + +We use the existential quantifier \`∃r ∈ RM\` to represent "for any element \`r\` in the set \`RM\`, there is such an action". The state transition in TLA+ is atomic, so in a state, only one \`r\` will be selected in this "or" branch, which can be compared to the \`for r in RM\` in the programming language, but fundamentally different. + +At this point, the modeling of the system is complete. Now we need to write the system's constraint conditions: + +![image11](/xline-home/blog/Thinking-About-Programs-from-Mathematical-Perspective-to-Verify-Their-Correctness/image11.png) + +In the constraint condition \`TypeOK\`, we have limited the possible values of each variable. The \`[RM → {"working", "prepared", "committed", "aborted"}]\` is similar to the Cartesian product of the set \`RM\` and the set \`{"working", "prepared", "committed", "aborted"}\`, but the result is a set composed of records: + +\`\`\`rust +{ + [r1 |-> "working", r2 |-> "working"], + [r1 |-> "working", r2 |-> "prepared"], + [r1 |-> "working", r2 |-> "committed"], + ... + [r1 |-> "aborted", r2 |-> "committed"], + [r1 |-> "aborted", r2 |-> "aborted"] +} +\`\`\` + +In \`TypeOK\`, we use the set \`Messages\` defined above. When defining \`Messages\`, we used the syntax: \`[type: {"Prepared"}, rm: RM]\`. This syntax is also similar to the Cartesian product of \`{"Prepared"}\` and \`RM\`, but the result is also a record set: + +\`\`\`rust +{ + [type |-> "Prepared", rm |-> r1], + [type |-> "Prepared", rm |-> r2], + ... +} +\`\`\` + +The final constraint condition \`Consistent\` is used to ensure the consistency of the system: at any time, it is impossible for two Resource Managers to be in the \`committed\` and \`abort\` state respectively. + +Finally, we will give the constraint conditions as invariants, together with the system model, to the TLC Model Checker for verification, and we can prove the correctness of the system. + +## Summary + +From the above two examples, we have a preliminary understanding of the idea of formal methods. TLA+ is designed for verifying distributed systems, but its ideas can be applied to fields far beyond distributed systems. When writing programs, if we can not only consider the contents on the code level, but also think from a higher level, from a mathematical point of view, we can write more robust programs. + +If you are interested in TLA+, you can refer to [Leslie Lamport's The TLA+ Video Course - YouTube](https://youtube.com/playlist?list=PLWAv2Etpa7AOAwkreYImYt0gIpOdWQevD) and [Learn TLA+](https://learntla.com). +`,L5=`--- + + cover: /xline-home/blog/How-to-elegantly-organize-async-Rust-code/cover.png + author: + name: Tianyu Chen + url: https://github.com/datenlord + img_url: /xline-home/DatenLord.png + read_time: 5 + +--- + +Elegant-The article starts from my experience of writing async Rust code and concludes with my practice of applying the principles in a recent refractoring of Curp. + +--- + +## Summary + +Anyone who has worked with async Rust has likely struggled with the bounds it requires, e.g., the \`'static\` bound on spawned tasks, \`MutexGuard\` can not be held across \`.await\` point. Overcoming these constraints requires carefully structured scopes, which might result in opaque and nested code that is challenging for both the developer to write and for reviewers to read. In this talk, I will first list some pain points from my experience of writing async Rust code. Then, I will point out scenarios where we actually need async code and argue why we should separate async and non-async code. Finally, I will demonstrate how I've practiced this principle in a recent refactoring of Curp. + +## Pain Point + +### Spawned Task must be \`'static\` + +The compiler has no idea how long an asynchronous task will run for when we create it; it may be ephemeral or it may continue to run until the program terminates. For this reason, the compiler requires all types owned by the tasks to be \`'static\`. +Such a limitation often leads to a lot of cloning before spawning a task. Admittedly, these codes help programmers to better understand which variables' ownership should be transferred to the new task. Unfortunately, the code will look tedious. + +\`\`\`rust +let a_arc = Arc::clone(&a); +let b_arc = Arc::clone(&b); +tokio::spawn(async move { + // ... +}); +\`\`\` + +### \`Non-Send\` variables cannot be held across \`.await\` point + +The Tokio runtime can move a task between threads at every \`.await\`. That's why all variables that are held across\` .await\` must be sent, bringing a lot of trouble when writing async functions. + +For example, the following code does not compile because \`log_l\`, a non-\`Send\` \`MutexGuard\`, can not be held across the \`.await\` point. + +\`\`\`rust +let mut log_l = log.lock(); +log_l.append(new_entry.clone()); +broadcast(new_entry).await; +\`\`\` + +As the broadcast could take a while, we don't want the \`MutexGuard\` to be held across the.await point either. The compiler does a great job at pointing up places for possible performance improvement. + +To avoid this, we naturally add a line to drop the lock just before broadcasting. + +\`\`\`rust +let mut log_l = log.lock(); +log_l.append(new_entry.clone()); +drop(log_l); +broadcast(new_entry).await; +\`\`\` + +Sadly, it still won't compile. The explanation here is from \`tokio\` official website: + +> The compiler currently calculates whether a future is \`Send\` based on scope information only. The compiler will hopefully be updated to support explicitly dropping it in the future, but for now, you must explicitly use a scope. + +To get around, we must wrap our code in an redundant scope. The code is not elegant anymore🙁. + +\`\`\`rust +{ + let mut log_w = log.write(); + log_w.append(new_entry.clone()); +} +broadcast(new_entry).await; +\`\`\` + +More nested scope will be created if multiple locks must be acquired by an async function. When this happens, the code becomes unreadable and unmaintainable. + +> Side Note: You might be wondering why we don't make use of the async lock(\`tokio::sync::Mutex\`) tokio offers. It can be held across the \`.await\` point and will save us a lot of trouble. That's because it has relatively limited use cases in practice. Normally, we don't want critical sections to be too long. For example, we don't want to hold the lock when we are broadcasting the new entry. Therefore, be careful about async mutex, you don't want to accidentally use it. + +## Async scenarios + +The previously mentioned problems are, in my opinion, caused by a lack of clarity in the separation between async and non-async code. In other words, we may fail to separate the async part and non-async part when designing our application's architecture. So, I will sort out the scenarios where we can actually take advantage of async Rust. + +### I/O + +You don't want I/O to block the current thread since I/O can take a long time. Async I/O helps us to hand out control flow to other tasks when we are waiting for I/O resources. + +\`\`\`rust +// .await will enable other scheduled tasks to progress +let mut file = File::create("foo.txt").await?; + +file.write(b"some bytes").await?; +\`\`\` + +### Background tasks + +You want to spawn a background task in order to handle things in the background(usually paired with the receive end of an async channel). + +\`\`\`rust +tokio::spawn(async move { + while let Some(job) = rx.recv().await { + // ... + } +}; +\`\`\` + +### Concurrent tasks + +You want to spawn multiple tasks to utilize multicore. + +\`\`\`rust +let chunks = data.chunks(data.len() / N_TASKS); +for chunk in chunks { + tokio::spawn(work_on(chunk)); +} +\`\`\` + +### Wait for others + +You want to pause the current thread and wait for some other events. + +\`\`\`rust +// wait for some event +event.listen().await; + +// barrier +barrier.wait().await; +\`\`\` + +As can be seen, async code usually resides in limited places: I/O, concurrent, and background tasks. Therefore, when we are designing our code, we can consciously identify async functions and try to minimize them. Separating these two parts can not only alleviate the pain points mentioned at the beginning of the article, but also help us to clarify the code structure. + +\`\`\`rust +// before +{ + let mut log_w = log.write(); + log_w.append(new_entry.clone()); + // ... +} +broadcast(new_entry).await; + +// after: move the logic to another function instead + +fn update_log(log: &mut Log, new_entry: Entry) { + log.append(new_entry); + // ... +} + +update_log(&mut log.write(), new_entry.clone()); +broadcast(new_entry).await; +\`\`\` + +## Regarding a recent major refactor of curp + +Before refactoring, due to multiple iterations, the readability and structure of the code became increasingly poor. Specifically, we had several lock structures that needed to be shared among various parts of the Curp server, and most functions of Curp server were async. The async and locking code were mixed together, frequently leading to the aforementioned pain points during development. + +Therefore, we reorganized the structure of Curp server, dividing it into an async part called CurpNode and a non-async part called Rawcurp: + +- CurpNode includes only async code + - I/O tasks: receiving, sending network requests, persisting log entries + - Background tasks: periodically checking leader activity, copying and aligning data on each node +- Rawcurp can be considered as a state machine that receives calls from CurpNode and updates the state. It includes only non-async code. If RawCurp wants to perform some async operations (such as broadcasting heartbeat), it can use return values and channels to let CurpNode make requests on its behalf. + +![image1](/xline-home/blog/How-to-elegantly-organize-async-Rust-code/image1.png) + +Take our tick function as an example. Before refactoring, due to the limitation that LockGuard cannot pass the await point and the restriction of multiple logical branches, we had to organize the code in this way: + +\`\`\`rust + loop { + let _now = ticker.tick().await; + let task = { + let state_c = Arc::clone(&state); + let state_r = state.upgradable_read(); + if state_r.is_leader() { + if state_r.needs_hb + { + let resps = bcast_heartbeats(connects.clone(), state_r, rpc_timeout); + Either::Left(handle_heartbeat_responses( + resps, + state_c, + Arc::clone(&timeout), + )) + } else { + continue; + } + } else { + let mut state_w = RwLockUgradableReadGuard::upgrade(state_r); + // ... + let resps = bcast_votes(connects.clone(), state_r, rpc_timeout); + Either::Right(handle_vote_responses(resps, state_c)) + } + }; + task.await; + } +\`\`\` + +After the refactoring, the code is significantly more understandable because all of the non-async functionality has been transferred to \`RawCurp\`. + +\`\`\`rust +loop { + let _now = ticker.tick().await; + let action = raw_curp.tick(); + match action { + TickAction::Heartbeat(hbs) => { + Self::bcast_heartbeats(Arc::clone(&raw_curp), &connects, hbs).await; + } + TickAction::Votes(votes) => { + Self::bcast_votes(Arc::clone(&raw_curp), &connects, votes).await; + } + TickAction::Nothing => {} + } +} +\`\`\` +`,P5=`--- + cover: /xline-home/blog/Database-Isolation-Levels-and-MVCC/cover.png + author: + name: Jicheng Shi + url: https://github.com/rogercloud + img_url: https://avatars.githubusercontent.com/u/939078?v=4 + read_time: 5 +--- + +When processing multiple transactions at the same time, the database needs to decide whether the transactions can see each other's changes, how much they can see, etc. + +--- + +## Introduction to database isolation levels + +When processing multiple transactions at the same time, the database needs to decide whether the transactions can see each other's changes, how much they can see, etc. According to the strict level of isolation, they can be classified from strict to loose as Serializable, Repeatable reads, Read committed, Read uncommitted. We use the following example of KV storage to explain these four isolation levels. The initial situations of the KV storage are as follows: + +![image1](/xline-home/blog/Database-Isolation-Levels-and-MVCC/image1.png) + +### Read uncommitted + +When two transactions are being executed at the same time, top-down is the order of execution. + +![image2](/xline-home/blog/Database-Isolation-Levels-and-MVCC/image2.png) + +Under the isolation level of Read uncommitted, multiple transactions executing at the same time are able to see each other not committing the writing operations, which can be considered almost useless. +In the above example, Operation 2 reads "AA" and even though the second transaction eventually Rollback, Operation 4 still reads "DD". When two transactions are being executed simultaneously in the Read committed, they follow top-down order. + +![image3](/xline-home/blog/Database-Isolation-Levels-and-MVCC/image3.png) + +Under the isolation level of Read committed, only the result after Commit can be seen. So in the execution order of Table 2, both Operation 2 and 4 can read the value of "AA", that is, the value of Key 1 is not changed. If two transactions are executed as in Table 3, Operation 2 will read "AA" and Operation 5 will read "DD", because Transaction 2 has been executed successfully at the time. + +### Repeatable read + +If Transaction 1 in Table 3 has two consecutive read operations while the user wants to guarantee that the same value is read, then the repeatable read isolation level should be used. Under this isolation level, multiple reads of the same data in the same transaction are guaranteed to yield the same value, even if the data is modified by other committed transactions in the process. Of course, there are cases where isolation is not guaranteed in this isolation level, which is shown as follows: + +![image4](/xline-home/blog/Database-Isolation-Levels-and-MVCC/image4.png) + +Under the isolation level of repeatable read, Operation 2 returns ["CC"] as result, which means only the value of Key 3 is returned, while that of Operation 5 is [“CC", "DD"]. To summarize, the isolation level of repeatable read still cannot perfectly handle situations involving multiple pieces of data, especially when new data is inserted or deleted. + +### Serializable + +The strictest isolation level is called Serializable, which is also the most perspicuously defined. The execution result under this level is "as if" all transactions were serialized and executed one by one. + +It is worth emphasizing the word "as if" in the above sentence. To improve performance, few databases use serial execution on the real meaning of physical to ensure Serializable, but only to achieve a similar effect, which can be achieved in a variety of ways. There is a subcategory under the Serializable level called Snapshot, which is similar to Serializable but slightly less constrained. It is because of the relaxation of constraints that gives a better-performed implementation and makes it the default supported isolation level by most databases. + +Let's talk about Snapshot, and by extension, the MVCC implementation. + +## Snapshot isolation level and MVCC + +To distinguish between the strictest Serializable and Snapshot, let's look at the following two transactions as examples. + +![image5](/xline-home/blog/Database-Isolation-Levels-and-MVCC/image5.png) + +If strictly following the Serializable isolation level, regardless of either Transaction 1 or 2 is executed first, the ultimate value of Key 1 and 2 is the same, either "AA" or "BB". + +However, when executed under the Snapshot level, the result is that the values of Key 1 and 2 are swapped. + +The isolation power of Snapshot is obviously weaker in this case. Isolation seems helpless in dealing with the order of transactions with read-write intersections, while only ensuring the order of transactions with write conflicts. + +While the above example looks specifically at the differences between the Snapshot isolation level and Serializable, we have not yet fully described the characteristics of Snapshot: + +- Transactions in Snapshot have two important timestamps, a read timestamp R and a write timestamp W. All read operations after R can only read the data committed before R. +- Snapshot allows two transactions that do not have a write intersection to execute simultaneously and in parallel. + +In order to satisfy both of these features, it is natural to think of saving multiple versions for each data, so that when a write operation is committed, the new data is saved in the new version while the old one is not covered, which is what we call MVCC (Multiversion concurrency control). + +We know that there is no conflict between read operations, and write operations cannot be executed simultaneously under the Snapshot level (or Roll back if a conflict is found), so MVCC works mainly when there is a conflict between read and write operations, allowing two seemingly conflicting transactions to execute concurrently. + +MVCC also requires garbage collection, otherwise too much old version data will take up unnecessary storage space. The next question is, how do you determine whether a version of data can be deleted? The answer is that it can be deleted when all read operations involved in such version of data are completed, provided that there is a newer version of data ahead. + +## Some little thoughts + +In the process of introducing MVCC we can easily capture the following key points: +1.Multiple versions. +2.Garbage handling. +3.Improving the efficiency of concurrent operations. + +In a previous article by DatenLord titled "Memory Management for Rust Language Lock-Free Data Structures", we introduced another technology related to these keywords, which is the "epoch-based memory management" (epoch) method for lock-free data structures. Epoch maintains the memory state of two generations, and when the memory of the oldest generation is no longer accessible, then the corresponding memory will be reclaimed and released, and a new generation will be opened. The purpose of doing this is also to allow the operation of modifying the data of the new generation and the operation of reading the data of the old generation to be parallelized, also to achieve read-write concurrency optimization. Of course, in addition to these similarities, there are also differences in that MVCC can simultaneously exist in many versions, while epoch always exists in two versions. This can be interpreted as epoch's memory management being more granular, so when contention is heavy epoch can sometimes cause an increase in memory pressure. + +In general, MVCC and epoch are similar in the central idea of using multi-version memory control technology to solve the problem of concurrent read/write conflicts. + +## Summary + +In this paper, we introduced the four isolation levels of the database and the differences between the different isolation levels with examples. + +Later, we dug into details about Snapshot, a most widely used insolation level and its most frequently used implementing method MVCC. +Finally, compared and discussed the memory management mechanisms of MVCC and lock-free data structures. + +DatenLord project Xline focuses on cross-cloud metadata management KV storage and is currently using MVCC for database isolation in practice. If you want to learn more about it, please refer to the Xline GitHub link: [https://github.com/datenlord/Xline](https://github.com/datenlord/Xline) +`,z5=`--- + cover: /xline-home/blog/The-design-and-implementation-of-the-Xline-persistent-storage-layer/cover.png + author: + name: Jiawei Zhao + url: https://github.com/Phoenix500526 + img_url: https://avatars.githubusercontent.com/u/9337239?v=4 + read_time: 20 +--- + +In the early prototype phase of Xline, we used in-memory storage for data persistence. While this simplified the complexity of the Xline prototype design and speeded up the development and iteration of the project, it also had significant consequences: since the data was stored in memory, the recovery of node data after a process crash relied on pulling the full data from other healthy nodes, resulting in longer recovery times. + +--- + +## Introduction + +In the early prototype phase of Xline, we used in-memory storage for data persistence. While this simplified the complexity of the Xline prototype design and speeded up the development and iteration of the project, it also had significant consequences: since the data was stored in memory, the recovery of node data after a process crash relied on pulling the full data from other healthy nodes, resulting in longer recovery times. + +With this consideration in mind, Xline introduced a Persistent Storage Layer in its latest release v0.3.0 to persist data to disk and shield upper-layer callers from irrelevant low-level details. + +## Selection of Storage Engines + +Currently, mainstream storage engines in the industry can be broadly categorized into B+ Tree-based storage engines and LSM Tree-based storage engines. Each has its own advantages and disadvantages. + +### Analysis of B+ Tree Read and Write Amplification + +When reading data from B+ Tree, we need to first search along the root node, and then move down the index until we finally reach the bottom leaf node. Each access corresponds to one disk IO. Similarly, when writing data, the search starts from the root node and goes down to the appropriate leaf node for data insertion. + +To facilitate the analysis, let's make the following assumption: the block size of the B+ Tree is denoted as B, so each internal node contains O(B) child nodes, and each leaf node contains O(B) data entries. Assuming the size of the dataset is N, the height of the B+ Tree is approximately $$O(\\log_B(\\frac{N}{B}))$$ + +Write Amplification: Each insert operation in the B+ Tree writes data to a leaf node, regardless of the actual size of the data. This means that each insert operation requires writing a block of size B, resulting in a write amplification of O(B). + +Read Amplification: A single query in the B+ Tree requires traversing from the root node to a specific leaf node, resulting in a number of I/O operations equal to the height of the tree, which is approximately O(log_B(N/B)). Thus, the read amplification is O(log_B(N/B)). + +### LSM Tree Read and Write Amplification Analysis + +In LSM Tree, when data is written, it is first written to an in-memory file called the memtable (Level 0) in an append-only manner. When the memtable reaches a certain size, it is converted into an immutable memtable and merged into the next level. For data retrieval, the search starts in the memtable, and if the search fails, it proceeds to search in lower levels until the element is found. LSM Tree often utilizes Bloom Filters to optimize read operations by filtering out elements that do not exist in the database. + +Assuming the dataset size is N, the amplification factor is k, and the minimum file size in each level is B, with each level having the same file size as B but a different number of files. + +Write Amplification: Assuming we write a record, it will be compacted to the next level after being written k times in the current level. Therefore, the average write amplification per level is $$\\frac{\\sum_{i=1}^{k} k_i}{k} = \\frac{k+1}{2} $$. There are $$\\log_k(\\frac{N}{B} ) $$ levels in total, so the write amplification is $$O(k\\log_k(\\frac{N}{B}))$$. + +Read Amplification: In the worst-case scenario, data is compacted to the last level, and a binary search is required at each level until the data is found at the last level. +For the highest level, $$level_i$$, with data size O(N), a binary search requires $$O(\\log \\frac{N}{B}) $$ disk read operations. +For the next level, $$level_{i-1}$$, with data size $$O(\\frac{N}{k})$$, a binary search requires $$O(\\log \\frac{N}{kB}) $$ disk read operations. +For $$level_{i-2}$$, with data size $$O(\\frac{N}{k^2})$$, a binary search requires $$O(\\log \\frac{N}{k^2B})$$ disk read operations. +..... +Continuing this pattern, the final read amplification can be calculated as R = $$\\sum_{i=0}^{n}(\\log(\\frac{N}{k^iB} )) = O(\\frac{\\log^2\\frac{N}{B}}{log_k}) $$ + +### Summary + +![image](/xline-home/blog/The-design-and-implementation-of-the-Xline-persistent-storage-layer/image1.PNG) + +From the analysis of read and write amplification, it can be concluded that B+ Tree-based storage engines are more suitable for scenarios with more reads and fewer writes, while LSM Tree-based storage engines are more suitable for scenarios with more writes and fewer reads. + +As an open-source distributed KV storage software written in Rust, Xline needs to consider the following factors when selecting a persistent storage engine: + +1. In terms of Performance: Storage engines often become one of the performance bottlenecks in a system, so it is necessary to choose a high-performance storage engine. High-performance storage engines are typically implemented in high-performance languages, preferably with asynchronous implementations. Rust language is the first choice, followed by C/C++. + +2. From a development perspective: Prioritize the implementation in Rust language to reduce additional development work at the current stage. + +3. From a maintenance perspective: + +- Consider the supporters behind the engine, with priority given to large commercial companies and open-source communities. +- It should be widely used in the industry to facilitate learning from experiences in debugging and tuning processes. +- It should have high visibility and popularity (GitHub stars) to attract excellent contributors. + +4. From a functional perspective: The storage engine should provide transactional semantics, support basic KV operations, and batch processing operations. + +The priority order of requirements is: Functionality > Maintenance > =Performance > Development. + +We conducted research on several open-source embedded databases, including Sled, ForestDB, RocksDB, Bbolt, and Badger. Among them, only RocksDB fulfilled all four requirements mentioned earlier. RocksDB, implemented and open-sourced by Facebook, has been widely adopted in the industry with good production practices. It also maintains a stable release cycle and perfectly covers our functional requirements. + +Xline primarily serves the consistency metadata management across cloud data centers, where the workload is predominantly read-intensive with fewer writes. Some readers may wonder why we chose RocksDB even though it is an LSM Tree-based storage engine, which is more suitable for write-intensive, read-light scenarios. + +Indeed, in theory, the most suitable storage engine should be based on B+ Trees. However, considering that B+ Tree-based embedded databases like Sled and ForestDB lack extensive production practices and their version maintenance has stalled, we made a trade-off and selected RocksDB as the storage backend for Xline. Additionally, we designed the Persistent Storage Layer with good interface separation and encapsulation to minimize the cost of changing the storage engine in the future, considering the possibility of more suitable storage engines becoming available. + +## Design and Implementation of the Persistent Storage Layer + +Before discussing the design and implementation of the persistent storage layer, it is important to clarify our expectations and requirements for persistent storage: + +1. As mentioned earlier, after considering the trade-offs, we have chosen RocksDB as the backend storage engine for Xline. However, we cannot rule out the possibility of replacing this storage engine in the future. Therefore, the design of the StorageEngine should adhere to the Open-Closed Principle (OCP) and support configurability and easy replacement. +2. We need to provide a basic key-value (KV) interface for the upper-layer users. +3. A comprehensive recovery mechanism needs to be implemented. + +### Overall Architecture and Write Flow + +Let's first take a look at the current overall architecture of Xline, as shown in the following diagram: +![image](/xline-home/blog/The-design-and-implementation-of-the-Xline-persistent-storage-layer/image2.png) +From top to bottom, the overall architecture of Xline can be divided into the access layer, consensus module, business logic module, storage API layer, and storage engine layer. The storage API layer is responsible for providing business-related StorageApi to both the business module and the consensus module, while abstracting the implementation details of the underlying storage engine. The storage engine layer is responsible for the actual data persistence operations. +Let's take a PUT request as an example to understand the data writing process. When a client initiates a PUT request to the Xline Server, the following events occur: + +1. The KvServer receives the PutRequest from the client and performs validity checks. Once the request passes the checks, it sends a propose RPC request to the Curp Server using its own CurpClient. +2. Upon receiving the Propose request, the Curp Server first enters the fast path flow. It stores the command from the request in the Speculative Executed Pool (aka. spec_pool) to determine if it conflicts with any existing commands in the pool. If there is a conflict, it returns ProposeError::KeyConflict and waits for the slow path to complete. Otherwise, it continues with the current fast path. +3. In the fast path, if a command is neither conflicting nor duplicated, it notifies the background cmd_worker for execution through a specific channel. Once the cmd_worker starts executing the command, it stores the corresponding command in the CommandBoard to track the execution progress. +4. When consensus is reached among multiple nodes in the cluster, the state machine log is committed and persisted in the CurpStore. Finally, the log is applied, triggering the corresponding CommandExecutor in the business module. Each server's store module is responsible for persisting the actual data to the backend database using the DB interface during the apply process. + +### Interface Design + +The following diagram illustrates the relationships between the StorageApi and StorageEngine traits, as well as their corresponding data structures. + +![image](/xline-home/blog/The-design-and-implementation-of-the-Xline-persistent-storage-layer/image3.png) + +#### Storage Engine Layer + +The Storage Engine Layer primarily defines the StorageEngine trait and related errors. +Definition of StorageEngine Trait (engine/src/engine_api.rs): + +\`\`\`rust +/// Write operation +#[non_exhaustive] +#[derive(Debug)] +pub enum WriteOperation<'a> { + /// \`Put\` operation + Put { table: &'a str, key: Vec, value: Vec }, + /// \`Delete\` operation + Delete { table: &'a str, key: &'a [u8] }, + /// Delete range operation, it will remove the database entries in the range [from, to) + DeleteRange { table: &'a str, from: &'a [u8], to: &'a [u8] }, +} + +/// The \`StorageEngine\` trait +pub trait StorageEngine: Send + Sync + 'static + std::fmt::Debug { + /// Get the value associated with a key value and the given table + /// + /// # Errors + /// Return \`EngineError::TableNotFound\` if the given table does not exist + /// Return \`EngineError\` if met some errors + fn get(&self, table: &str, key: impl AsRef<[u8]>) -> Result>, EngineError>; + + /// Get the values associated with the given keys + /// + /// # Errors + /// Return \`EngineError::TableNotFound\` if the given table does not exist + /// Return \`EngineError\` if met some errors + fn get_multi( + &self, + table: &str, + keys: &[impl AsRef<[u8]>], + ) -> Result>>, EngineError>; + + /// Get all the values of the given table + /// # Errors + /// Return \`EngineError::TableNotFound\` if the given table does not exist + /// Return \`EngineError\` if met some errors + #[allow(clippy::type_complexity)] // it's clear that (Vec, Vec) is a key-value pair + fn get_all(&self, table: &str) -> Result, Vec)>, EngineError>; + + /// Commit a batch of write operations + /// If sync is true, the write will be flushed from the operating system + /// buffer cache before the write is considered complete. If this + /// flag is true, writes will be slower. + /// + /// # Errors + /// Return \`EngineError::TableNotFound\` if the given table does not exist + /// Return \`EngineError\` if met some errors + fn write_batch(&self, wr_ops: Vec>, sync: bool) -> Result<(), EngineError>; +} +\`\`\` + +Related Error Definitions + +\`\`\`rust +#[non_exhaustive] +#[derive(Error, Debug)] +pub enum EngineError { + /// Met I/O Error during persisting data + #[error("I/O Error: {0}")] + IoError(#[from] std::io::Error), + /// Table Not Found + #[error("Table {0} Not Found")] + TableNotFound(String), + /// DB File Corrupted + #[error("DB File {0} Corrupted")] + Corruption(String), + /// Invalid Argument Error + #[error("Invalid Argument: {0}")] + InvalidArgument(String), + /// The Underlying Database Error + #[error("The Underlying Database Error: {0}")] + UnderlyingError(String), +} +\`\`\` + +\`MemoryEngine\` (engine/src/memory_engine.rs) and \`RocksEngine\` (engine/src/rocksdb_engine.rs) implement the StorageEngine trait. MemoryEngine is mainly used for testing purposes, while the definition of RocksEngine is as follows: + +\`\`\`rust +/// \`RocksDB\` Storage Engine +#[derive(Debug, Clone)] +pub struct RocksEngine { + /// The inner storage engine of \`RocksDB\` + inner: Arc, +} + +/// Translate a \`RocksError\` into an \`EngineError\` +impl From for EngineError { + #[inline] + fn from(err: RocksError) -> Self { + let err = err.into_string(); + if let Some((err_kind, err_msg)) = err.split_once(':') { + match err_kind { + "Corruption" => EngineError::Corruption(err_msg.to_owned()), + "Invalid argument" => { + if let Some(table_name) = err_msg.strip_prefix(" Column family not found: ") { + EngineError::TableNotFound(table_name.to_owned()) + } else { + EngineError::InvalidArgument(err_msg.to_owned()) + } + } + "IO error" => EngineError::IoError(IoError::new(Other, err_msg)), + _ => EngineError::UnderlyingError(err_msg.to_owned()), + } + } else { + EngineError::UnderlyingError(err) + } + } +} + +impl StorageEngine for RocksEngine { + /// omit some code +} +\`\`\` + +#### StorageApi Layer + +##### Business Module + +Definition of StorageApi in the business module: + +\`\`\`rust +/// The Stable Storage Api +pub trait StorageApi: Send + Sync + 'static + std::fmt::Debug { + /// Get values by keys from storage + fn get_values(&self, table: &'static str, keys: &[K]) -> Result>>, ExecuteError> + where + K: AsRef<[u8]> + std::fmt::Debug; + + /// Get values by keys from storage + fn get_value(&self, table: &'static str, key: K) -> Result>, ExecuteError> + where + K: AsRef<[u8]> + std::fmt::Debug; + + /// Get all values of the given table from the storage + fn get_all(&self, table: &'static str) -> Result, Vec)>, ExecuteError>; + + /// Reset the storage + fn reset(&self) -> Result<(), ExecuteError>; + + /// Flush the operations to storage + fn flush_ops(&self, ops: Vec) -> Result<(), ExecuteError>; +} +\`\`\` + +In the business module, \`DB\` (xline/src/storage/db.rs) is responsible for converting StorageEngine into \`StorageApi\` for upper-level calls. Its definition is as follows: + +\`\`\`rust +/// Database to store revision to kv mapping +#[derive(Debug)] +pub struct DB { + /// internal storage of \`DB\` + engine: Arc, +} + +impl StorageApi for DB +where + S: StorageEngine +{ + /// omit some code +} +\`\`\` + +In the business module, different servers have their own Store backends, and the core data structure is the \`DB\` in the \`StorageApi\` Layer. + +##### Consensus Module + +The \`StorageApi\` definition of the Curp module is located in curp/src/server/storage/mod.rs. + +\`\`\`rust +/// Curp storage api +#[async_trait] +pub(super) trait StorageApi: Send + Sync { + /// Command + type Command: Command; + + /// Put \`voted_for\` in storage, must be flushed on disk before returning + async fn flush_voted_for(&self, term: u64, voted_for: ServerId) -> Result<(), StorageError>; + + /// Put log entries in the storage + async fn put_log_entry(&self, entry: LogEntry) -> Result<(), StorageError>; + + /// Recover from persisted storage + /// Return \`voted_for\` and all log entries + async fn recover( + &self, + ) -> Result<(Option<(u64, ServerId)>, Vec>), StorageError>; +} +\`\`\` + +\`RocksDBStorage\` (curp/src/server/storage/rocksdb.rs) is the CurpStore mentioned in the previous architectural diagram. It is responsible for converting \`StorageApi\` into underlying \`RocksEngine\` operations. + +\`\`\`rust +/// \`RocksDB\` storage implementation +pub(in crate::server) struct RocksDBStorage { + /// DB handle + db: RocksEngine, + /// Phantom + phantom: PhantomData, +} + +#[async_trait] +impl StorageApi for RocksDBStorage { + /// Command + type Command = C; + /// omit some code +} +\`\`\` + +#### Implementation Details + +##### Data Views + +With the introduction of the Persistent Storage Layer, Xline uses logical tables to separate different namespaces. Currently, these tables correspond to Column Families in the underlying RocksDB. +The following tables are currently available: + +1. curp: Stores persistent information related to curp, including log entries, voted_for, and corresponding term information. +2. lease: Stores granted lease information. +3. kv: Stores key-value information. +4. auth: Stores the enablement status of auth in Xline and the corresponding enable revision. +5. user: Stores user information added in Xline. +6. role: Stores role information added in Xline. +7. meta: Stores the current applied log index. + +##### Scalability + +Xline separates storage-related operations into two different traits, StorageEngine and StorageApi, and distributes them across two different layers to isolate changes. The StorageEngine trait provides a mechanism, while the StorageApi is defined by upper-level modules, allowing different modules to have their own definitions and implement specific storage strategies. The CurpStore and DB in the StorageApi layer are responsible for implementing the conversion between these two traits. Since the upper-level callers do not directly depend on the underlying Storage Engine, changing the storage engine later would not require extensive modifications to the code of the upper-level modules. + +##### Recovery Process + +For the recovery process, two important aspects need to be considered: what data to recover and when to perform the recovery. Let's first examine the data involved in recovery between different modules. + +###### Consensus Module + +In the consensus module, since RocksDBStorage is exclusive to Curp Server, the recovery process can be directly added to the respective StorageApi trait. The specific implementation is as follows: + +\`\`\`rust +#[async_trait] +impl StorageApi for RocksDBStorage { + /// Command + type Command = C; + /// omit some code + async fn recover( + &self, + ) -> Result<(Option<(u64, ServerId)>, Vec>), StorageError> { + let voted_for = self + .db + .get(CF, VOTE_FOR)? + .map(|bytes| bincode::deserialize::<(u64, ServerId)>(&bytes)) + .transpose()?; + + let mut entries = vec![]; + let mut prev_index = 0; + for (k, v) in self.db.get_all(CF)? { + // we can identify whether a kv is a state or entry by the key length + if k.len() == VOTE_FOR.len() { + continue; + } + let entry: LogEntry = bincode::deserialize(&v)?; + #[allow(clippy::integer_arithmetic)] // won't overflow + if entry.index != prev_index + 1 { + // break when logs are no longer consistent + break; + } + prev_index = entry.index; + entries.push(entry); + } + + Ok((voted_for, entries)) + } +} +\`\`\` + +For the consensus module, during the recovery process, the voted_for value and the corresponding term are first loaded from the underlying database. This is a security guarantee for the consensus algorithm to prevent voting twice within the same term. Subsequently, the corresponding log entries are loaded. + +###### Business Module + +For the business module, different servers have different stores and rely on the mechanisms provided by the underlying DB. Therefore, the recovery process is not defined in the StorageApi trait but exists as separate methods in LeaseStore (xline/src/storage/lease_store/mod.rs), AuthStore (xline/src/storage/auth_store/store.rs), and KvStore (xline/src/storage/kv_store.rs). + +\`\`\`rust +/// Lease store +#[derive(Debug)] +pub(crate) struct LeaseStore +where + DB: StorageApi, +{ + /// Lease store Backend + inner: Arc>, +} + +impl LeaseStoreBackend +where + DB: StorageApi, +{ + /// omit some code + /// Recover data form persistent storage + fn recover_from_current_db(&self) -> Result<(), ExecuteError> { + let leases = self.get_all()?; + for lease in leases { + let _ignore = self + .lease_collection + .write() + .grant(lease.id, lease.ttl, false); + } + Ok(()) + } +} + +impl AuthStore +where + S: StorageApi, +{ + /// Recover data from persistent storage + pub(crate) fn recover(&self) -> Result<(), ExecuteError> { + let enabled = self.backend.get_enable()?; + if enabled { + self.enabled.store(true, AtomicOrdering::Relaxed); + } + let revision = self.backend.get_revision()?; + self.revision.set(revision); + self.create_permission_cache()?; + Ok(()) + } +} +\`\`\` + +Among them, the recovery logic for \`LeaseStore\` and \`AuthStore\` is relatively simple, and we won't delve into it too much. Let's focus on the recovery process of \`KvStore\`. The flowchart for its recovery process is as follows: + +![image](/xline-home/blog/The-design-and-implementation-of-the-Xline-persistent-storage-layer/image4.png) + +###### Recovery Timing + +The recovery timing in Xline primarily occurs during the initial system startup. The recovery of the business module is prioritized, followed by the recovery of the consensus module. Since the recovery of KvStore depends on the recovery of LeaseStore, the recovery of LeaseStore needs to take place before the recovery of KvStore. The corresponding code in xline/src/server/xline_server.rs is as follows: + +\`\`\`rust +impl XlineServer +where + S: StorageApi, +{ + /// Start \`XlineServer\` + #[inline] + pub async fn start(&self, addr: SocketAddr) -> Result<()> { + // lease storage must recover before kv storage + self.lease_storage.recover()?; + self.kv_storage.recover().await?; + self.auth_storage.recover()?; + let (kv_server, lock_server, lease_server, auth_server, watch_server, curp_server) = + self.init_servers().await; + Ok(Server::builder() + .add_service(RpcLockServer::new(lock_server)) + .add_service(RpcKvServer::new(kv_server)) + .add_service(RpcLeaseServer::from_arc(lease_server)) + .add_service(RpcAuthServer::new(auth_server)) + .add_service(RpcWatchServer::new(watch_server)) + .add_service(ProtocolServer::new(curp_server)) + .serve(addr) + .await?) + } +\`\`\` + +The recovery process of the consensus module (curp/src/server/curp_node.rs) is as follows, with the function call chain: XlineServer::start -> XlineServer::init_servers -> CurpServer::new -> CurpNode::new + +\`\`\`rust +// utils +impl CurpNode { + /// Create a new server instance + #[inline] + pub(super) async fn new + 'static>( + id: ServerId, + is_leader: bool, + others: HashMap, + cmd_executor: CE, + curp_cfg: Arc, + tx_filter: Option>, + ) -> Result { + // omit some code + // create curp state machine + let (voted_for, entries) = storage.recover().await?; + let curp = if voted_for.is_none() && entries.is_empty() { + Arc::new(RawCurp::new( + id, + others.keys().cloned().collect(), + is_leader, + Arc::clone(&cmd_board), + Arc::clone(&spec_pool), + uncommitted_pool, + curp_cfg, + Box::new(exe_tx), + sync_tx, + calibrate_tx, + log_tx, + )) + } else { + info!( + "{} recovered voted_for({voted_for:?}), entries from {:?} to {:?}", + id, + entries.first(), + entries.last() + ); + Arc::new(RawCurp::recover_from( + id, + others.keys().cloned().collect(), + is_leader, + Arc::clone(&cmd_board), + Arc::clone(&spec_pool), + uncommitted_pool, + curp_cfg, + Box::new(exe_tx), + sync_tx, + calibrate_tx, + log_tx, + voted_for, + entries, + last_applied.numeric_cast(), + )) + }; + // omit some code + Ok(Self { + curp, + spec_pool, + cmd_board, + shutdown_trigger, + storage, + }) + } +\`\`\` + +Performance Evaluation +In v0.3.0, except for introducing the persistent storage layer, we also conducted significant refactoring on certain parts of CURP. After completing the refactoring and adding new features, we recently passed the validation test and integration test. The performance testing information has already been released in Xline v 0.4.0. +Xline GitHub ：https://github.com/datenlord/Xline +`,B5=`--- + cover: /xline-home/blog/Introduction-to-CURP-Protocol/cover.png + author: + name: Jiawei Zhao + url: https://github.com/Phoenix500526 + img_url: https://avatars.githubusercontent.com/u/9337239?v=4 + read_time: 20 +--- + +Xline is an open source distributed KV storage engine, its core purpose is to achieve high-performance strong consistency across data centers, providing cross-data center metadata management. So how does Xline achieve this high-performance strong consistency across data centers? This article will lead you to find out. + +--- + +## 1. What is Xline + +Xline is an open source distributed KV storage engine, its core purpose is to achieve high-performance strong consistency across data centers, providing cross-data center metadata management. So how does Xline achieve this high-performance strong consistency across data centers? This article will lead you to find out. + +## 2. The Overall Architecture of Xline + +Let's take a look at the overall architecture of Xline, as shown below: + +![Graph1](/xline-home/blog/Introduction-to-CURP-Protocol/graph1.jpg) + +From top to bottom, Xline can be roughly divided into three layers, namely + +- Access layer: Implemented using the gRPC framework, responsible for receiving requests from clients. +- Middle Layer: it can be divided into CURP Consensus Module (left) and Business Server Module (right), where: + - CURP Consensus Module: Implements the CURP consensus algorithm, the code corresponds to the curp crate in Xline, while the corresponding RPC service is defined in curp/proto. + - Business Server Module: It is responsible for realizing the upper layer business logic of Xline, such as KvServer for KV-related requests and AuthServer for authentication requests, etc. The code corresponds to the xline crate, while the corresponding RPC service is defined in the xlineapi crate. +- Storage layer: responsible for the persistence of data and metadata within Xline, providing abstract interfaces to the upper layer, the code corresponds to the engine crate. + +## 3. Introduction to the CURP protocol + +### What is CURP? + +The consensus protocol used in Xline is not Paxos or Raft, but a new consensus protocol called CURP, which is called "Consistent Unordered Replication Protocol (CURP)". It was initiated in NSDI 2019's paper "Exploiting Commutativity For Practical Fast Replication," which was authored by Seo Jin Park, a PhD student from Stanford, and Prof. John Ousterhout, who is also the authors of Raft algorithm. + +### Why the CURP Protocol? + +Why did Xline use a new protocol like CURP instead of Raft or Multi-Paxos as the underlying consensus protocol? To illustrate, let's look at the problems with Raft and Multi-Paxos. +The following figure shows a flow of Raft's consensus process: + +![Graph2](/xline-home/blog/Introduction-to-CURP-Protocol/graph2.jpg) + +In this timing diagram, we can see how the Raft protocol reaches consensus: + +1. The client makes a proposal request to the leader. +2. The leader receives the proposal request from the client, appends it to its state machine log, and broadcasts the AppendEntries request to other followers in the cluster. +3. After receiving the AppendEntries request from the leader, the follower performs a log consistency check to determine whether it can be added to its own state machine log. It responds with a success message if the check is successful or a failure message if the check fails. +4. The leader counts the number of successful responses received, and if it exceeds half of the number of cluster nodes, the consensus is considered reached and the proposal is successful, otherwise the proposal is considered to have failed and the result is returned to the client. + +The following figure shows the flow of Multi-Paxos protocol to reach a consensus: + +![Graph3](/xline-home/blog/Introduction-to-CURP-Protocol/graph3.jpg) + +In this timing diagram, we can understand the flow of Multi-Paxos protocol to reach consensus: + +1. The client makes a proposal request to the leader. +2. The leader finds the index of the first unapproved log entry in its state machine log, and then executes the Basic Paxos algorithm to propose the log at index with the proposal value requested by the client. +3. The follower receives the proposal value from the leader and decides whether to accept the proposal value and return a successful response, or to return a failing response. +4. The leader counts the number of successful responses received, and if it exceeds half of the number of nodes in the cluster, it considers that the consensus has been reached and the proposal is successful, otherwise, it considers that the proposal fails and returns the result to the client. + +Be it Multi-Paxos or Raft, reaching consensus inevitably requires 2 RTTs. Both of them are based on a core assumption: the criteria of being durably stored and ordered must be met after command approval or log commit. As a result, the state machine can directly perform the approved commands or apply committed logs. Due to the inherent asynchrony of the network, ensuring orderliness is challenging. Therefore, a leader is required to enforce the execution order of different commands and achieve persistence by obtaining replication from the majority through broadcasting. This process cannot be completed within a single RTT. + +That's why Xline didn't choose Raft or Multi-Paxos as the underlying consensus algorithm. Xline was primarily designed to manage metadata across data centers. As we all know, for a single data center, the latency of its intranet is often very low, only a few milliseconds or even less than 1ms, while for a cross-datacenter wide area network, the network latency can reach tens of milliseconds or even hundreds of milliseconds. Traditional consensus algorithms, such as Raft or Multi-Paxos, require 2 RTTs to reach a consensus, regardless of the state of the consensus, which often leads to serious performance bottlenecks in such high latency network environments. This makes us wonder whether two or more RTTs are necessary to reach consensus in any case. + +The CURP algorithm is an unordered replication algorithm that breaks down the consensus scenarios into the following two categories: +**Fast path**: In non-conflicting scenarios , relaxing the ordering requirements for consensus does not affect the final consensus under the premise of persistent storage. Since the fast path only requires storage persistency, only 1 RTT is needed to reach consensus. We call fast path the front-end of the protocol. +**Slow path**: In conflicting scenarios, both the requirement for ordered concurrent request and persistent storage need to be satisfied, thus requring 2 RTTs to achieve consensus. We refer to the slow path as the back-end of the protocol. + +Then reader may wonder, what exactly is the conflict here? Let's use a simple KV operation as an example. In the nodes of a distributed system, the operations we do on the state machine are just read and write, and in the case of concurrent operations on the state machine, there are four scenarios: read-after-read, read-after-write, write-after-read, and write-after-write. Obviously, for read-after-read, which is a read-only operation with no side-effects, there is no conflict under any circumstances, and the final result is always the same, whether it is read first or next. When operating on different keys, for example, PUT A=1, PUT B=2, then for the final state of the state machine, no matter whether to execute PUT A=1 first, PUT B=2 next, or vice versa, the final result of reading from the state machine is A=1, B=2. The same applies to the scenario of read-write mixing. Therefore, when there is no intersection between the keys of multiple operations performed concurrently on a state machine, we say that these operations are non-conflicting. Conversely, if the concurrent operations include at least one write operation, and the keys of those operations are intersected, the operations are in conflict. + +### fast path vs. slow path + +How does CURP implement fast path and slow path? Below is a sketch of the cluster topology in the CURP algorithm. + +Let's take a look at what's going on in this diagram: + +![Graph4](/xline-home/blog/Introduction-to-CURP-Protocol/graph4.jpg) + +1. Client: the client that makes the request to the cluster. +2. Master: Corresponds to the leader node in the cluster, which holds the state machine logs, where the green part represents the logs that have been persisted to disk, and the blue part represents the logs that are stored in memory. +3. Follower nodes: Corresponds to the yellow dotted box in the figure above, each follower contains the following two components. + a. Witness: it can be approximated as a memory-based HashMap, on one hand, it is responsible for logging the current requests in the cluster in the fast path process, on the other hand, CURP will also use Witness to determine whether there is a conflict in the current request. All the records saved in Witness are unordered. + b. Backup: Keeps state machine logs that are persisted to disk. + +Next, let's take the example PUT z=7 in the figure to see the execution flow of fast path: + +1. Client broadcasts a request for PUT z=7 to all nodes in the cluster. +2. When a node in the cluster receives the request, it executes different logic depending on its role. + a. The leader receives the request and immediately writes the data z = 7 locally (that is, the blue part in the state machine log) and returns OK immediately. + b. When the follower receives the request, it uses witness to determine whether the request is in conflict . Since z = 7 does not conflict with y = 5, which is the only one in the witness, the follower saves z = 7 to the witness and returns OK to the client. +3. Client collects and counts the number of successful responses received. For a cluster with 2f + 1 nodes, when the number of received successful responses reaches f+f/2+1, the operation is confirmed to be persisted to the cluster, which takes 1 RTT for the whole process. + +Next, based on the previous fast path example, let's take PUT z = 9 as an example to see the execution flow of slow path. Since z = 9 conflicts with z = 7, the fast path initiated by the client will fail and the slow path will be executed: + +1. Client broadcasts a PUT z=9 request to all nodes in the cluster. +2. The nodes in the cluster receive the request and perform different logic according to their roles. + a. The leader receives the request and writes z = 9 to the state machine log. Since z = 9 conflicts with z = 7, it returns a KeyConflict response to the client and asynchronously initiates an AppendEntries request to synchronize the state machine log to the other nodes in the cluster. + b. The follower receives the request and refuses to save the proposal since z = 9 conflicts with z = 7 in the witness. +3. Client collects and counts the number of successful responses received. Since the number of rejected responses received exceeds f/2, client needs to wait for the slow path to complete. +4. When the AppendEntries in step 2 are executed successfully, the follower appends all three state machine logs (y = 5, z = 7, z = 9) of the leader to the Backup, removes the relevant logs from the witness, and returns the successful responses to the leader. +5. The leader counts the number of successful responses received. If it exceeds half of the number of cluster nodes, the consensus is considered reached and the proposal succeeds. Otherwise, the proposal fails and the result is returned to the client. + +## 4. Summary + +Xline is a distributed KV storage that provides strong consistency across data centers. One of its core problems is how to provide high-performance strong consistency in a high latency WAN environment across data centers. Traditional distributed consensus algorithms, such as Raft and Multi-Paxos, guarantee state machine consistency by making all operations satisfy storage persistency and the ordering prerequisite. The CURP protocol, makes a finer-grained division of consensus scenarios, splitting the protocol into front-end (fast path) and back-end (slow path), where the front-end only guarantees that the proposal will be persisted to the cluster, while the back-end not only guarantees persistence, but also ensures that all nodes that have saved the proposal will execute the commands in the same order, guaranteeing the consistency of the state machine. + +This is the end of the introduction to the CURP protocol. For more details, please refer to our other articles and shares, as follows: +Rethinking the Curp Consensus Protocol +DatenLord | Xline Geo-distributed KV Storage + +Xline is a geo-distributed KV storage for metadata management. Xline project is written in Rust, and you are welcomed to participate in our open-source project! +GitHub link: +https://github.com/xline-kv/Xline +Xline official website: www.xline.cloud +Xline Discord: +https://discord.gg/XyFXGpSfvb +`,F5=`--- + cover: /xline-home/blog/Mechanism-and-Implementation-of-Lease/cover.png + author: + name: Yu Guan + url: https://github.com/themanforfree + img_url: https://avatars.githubusercontent.com/u/56149350?v=4 + read_time: 20 +--- + +Xline is an open source distributed KV storage engine for managing small amounts of critical data, with the aim of high performance data access and strong consistency across data centers. Xline provides a series of etcd-compatible access interfaces, including KV, Watch, Lease, and more. In this article, we will focus on the Lease interface. + +--- + +## 1. Introduction + +Xline is an open source distributed KV storage engine for managing small amounts of critical data, with the aim of high performance data access and strong consistency across data centers. Xline provides a series of etcd-compatible access interfaces, including KV, Watch, Lease, and more. In this article, we will focus on the Lease interface. + +Lease is a lease mechanism between client and server. Similar to the car rental service in our real life, when we need to use a car, we can apply for a lease from the car rental company, the car rental company will assign a car to us, and guarantee that the car will not be assigned to other people during the validity period agreed between us and the car rental company. If we want to use it for a longer period of time, we can renew the lease to the car rental company. If we no longer want to use the car, we can either return and cancel it, or wait for the lease to expire and return it automatically. + +The use of Lease in Xline is very similar to the real life car rental service. The client can apply for a lease from the server, the server will then ensure that the lease will not be revoked during the validity period. The client can also end the lease early or extend the TTL of lease through the corresponding interface. Unlike real-life car rental, we can bind some key-values to the lease, while they will be deleted with the expiration of the lease. + +According to the ability of Lease introduced above, we can use Lease to realize our purpose in many scenarios, the following are some common Lease application scenarios: +Distributed locks: Distributed locks are realized through several mechanisms, while Lease play a role in avoiding deadlocks in distributed locks. When a client requests for a distributed lock, it creates a lease and renews the lease continuously, while also writes key-value and attaches it to the lease. This key-value represents the occupancy state of the distributed lock, and if the client occupying the lock is unable to release the lock actively due to a failure, the Lease mechanism ensures that the corresponding key-value will be deleted automatically to release the current lock after the expiration of the lease. +Service Registry: A lease is created when registering a new service, and written the key-value of service-related information with lease. During the survival of the service, the service will renew its lease continuously. If the lease cannot be renewed automatically after the service fails, the corresponding key-value will be deleted automatically, and the corresponding service will be deregistered in the registry center. +Authorization Management in Distributed Systems: Clients apply for a lease to gain permissions for resources, if the client loses connection with the server, or if the lease expires due to failure to renew the lease in time, the client loses the corresponding permissions. + +## 2. Architecture + +![Image](/xline-home/blog/Mechanism-and-Implementation-of-Lease/image1.PNG) + +The above figure is a simple architecture diagram of Lease implementation. There are two ways for an external client to send a request to the Xline cluster. One is to directly broadcast the request to all nodes in the cluster through the Curp protocol. After the Curp module reaches a consensus, it applies the request to the state machine, which is to write the request to the storage layer. + +Another way is for the client to directly send the request to the LeaseServer of one of the nodes in the cluster, which is also the service request method that is compatible with etcd. After the request reaches the LeaseServer, there will be two different processing paths, most of the requests will be broadcasted to all the nodes in the cluster through the Curp client bound to the server, and the remaining small number of requests may only be handled by some of the nodes, which will be forwarded to the LeaseServer of the specific nodes and applied to the state machine. + +## 3. Source Code Analysis + +### Source Code Organization + +The Lease-related source code is mainly stored in the following files, which are roughly organized into three sections: + +1. RPC Definitions: + +- xlineapi/proto/rpc.proto: rpc interface definitions for each Server within Xline, including the LeaseServer interface definition. +- xlineapi/proto/lease.proto: rpc message definition for Lease. + +2. LeaseServer implementation: + +- xline/src/server/lease_server.rs: Responsible for providing the implementation of the Lease RPC service, the main purpose is to provide etcd compliant interface.If the client send the propose directly through the external curp, this interface can be omitted, while some of the requests that do not go through the consensus protocol must be processed through the LeaseServer. + +3. LeaseStore implementation: + +- xline/src/storage/lease_store/lease.rs: Defines the Lease data structure, which is used to store Lease-related information, such as all the keys bound on the Lease, the expiration time of the Lease, the remaining TTL of the Lease, etc. It also implements some practical methods for it. +- xline/src/storage/lease_store/lease_queue.rs: Defines LeaseQueue and related methods. LeaseQueue is a priority queue consisting of lease IDs and lease expiration times, while a background-resident task will capture all the expired lease IDs through this structure at regular intervals. +- xline/src/storage/lease_store/lease_collection.rs: Defines the LeaseCollection and related methods. The LeaseCollection is a collection of the core data structures of a lease, providing the core capabilities of the lease mechanism. The structure contains three parts: lease_map saves all the lease structures; item_map caches the key to lease ID mapping; and expired_queue manages the lease expiration time. expired_queue is only used on the leader node, and is empty on other nodes. +- xline/src/storage/lease_store/mod.rs: Definition and method implementation of LeaseStore. It is responsible for providing the storage layer abstraction for lease and the storage layer interface for all lease related operations externally. Its inner part contains LeaseCollection and some data structures which are shared with KvStore. + +### Lease Creation + +If you want to use a lease, you must create a lease first, and when doing so, you need to use the LeaseGrant interface provided by LeaseServer. The LeaseGrant RPC is quite straightforward, which is to assign a lease ID, and submit the request to the consensus protocol through propose interface?. Once consensus is reached, the request is executed in the LeaseStore. + +LeaseStore will create and insert a new lease in LeaseCollection. The core code logic is as follows: + +\`\`\`rust +... +if is_leader { + let expiry = lease.refresh(Duration::ZERO); + let _ignore = inner.expired_queue.insert(lease_id, expiry); +} else { + lease.forever(); +} +let _ignore = inner.lease_map.insert(lease_id, lease.clone()); +... +\`\`\` + +Note that if the current node is the leader node, it also needs to manage the lease's expiration time. Therefore, it must calculate the expiration time of the lease through the refresh method and insert it into the expired_queue. The other nodes do not need this step, they just need to insert the new lease into the lease_map. + +After the lease is created, the server returns a response to the client containing the lease ID. + +### Using Lease + +![Image](/xline-home/blog/Mechanism-and-Implementation-of-Lease/image2.png) + +After getting the lease ID, the client can use the lease through the lease ID. When putting a pair of key values, lease ID can be attached. When this Put request is applied to the state machine, in addition to writing the key-value directly to the index and DB of the KvStore, it will detach the current key from the old lease by the detach method provided by the LeaseCollection, and attach the key that needs to be put to the new lease ID by attach. + +\`\`\`bash +pub(crate) fn attach(&self, lease_id: i64, key: Vec) -> Result<(), ExecuteError> { + let mut inner = self.inner.write(); + let Some(lease) = inner.lease_map.get_mut(&lease_id) else { + return Err(ExecuteError::lease_not_found(lease_id)); + }; + lease.insert_key(key.clone()); + let _ignore = inner.item_map.insert(key, lease_id); + Ok(()) +} +\`\`\` + +The implementation of attach is to find the corresponding lease by the lease ID, attach the key to the lease, and add the mapping of the key to the lease ID to the item_map. Detach is the opposite of attach, it removes the content inserted when attaching. + +After the above process, we have successfully associated the key with the lease ID. If the lease is actively revoked or times out, the lease and all the keys associated with it will be deleted. + +## Active Lease Deletion + +To delete a lease, you need to use the LeaseRevoke interface, which is basically the same as LeaseGrant in LeaseServer. Both of them pass the request to the consensus protocol for processing, while the only difference is that LeaseRevoke doesn't need to assign a lease ID. + +\`\`\`rust +let del_keys = match self.lease_collection.look_up(req.id) { + Some(l) => l.keys(), + None => return Err(ExecuteError::lease_not_found(req.id)), +}; +if del_keys.is_empty() { + let _ignore = self.lease_collection.revoke(req.id); + return Ok(Vec::new()); +} + +// delete keys ... + +let _ignore = self.lease_collection.revoke(req.id); +\`\`\` + +When LeaseRevoke is executed, it first tries to find out if the lease has any associated keys, if not, it can directly remove the lease through the revoke method on the LeaseCollection. If there are associated keys, it needs to remove all associated keys from the KV Store and clean up the relationship between these keys and the lease ID in the LeaseCollection before you can revoke the lease from the LeaseCollection. + +### Lease expiration + +![Image](/xline-home/blog/Mechanism-and-Implementation-of-Lease/image3.png) + +The Lease expiration process is shown in the above figure, which omits the consensus part. When initializing LeaseServer, a background resident revoke_expired_leases_task is created, the main code of this task is as follows: + +\`\`\`bash +loop { + // only leader will check expired lease + if lease_server.lease_storage.is_primary() { + for id in lease_server.lease_storage.find_expired_leases() { + let _handle = tokio::spawn({ + let s = Arc::clone(&lease_server); + async move { + let request = tonic::Request::new(LeaseRevokeRequest { id }); + if let Err(e) = s.lease_revoke(request).await { + warn!("Failed to revoke expired leases: {}", e); + } + } + }); + } + } + time::sleep(DEFAULT_LEASE_REQUEST_TIME).await; +} +\`\`\` + +On the node responsible for managing Lease expiration time, this task will periodically captures all the expired lease IDs through find_expired_leases, and calls the lease_revoke interface on the lease server to delete the expired Leases, utilizing the same interface as clients use to actively delete Leases. +find_expired_leases is a core method in LeaseCollection, and its implementation is as follows: + +\`\`\`rust +pub(crate) fn find_expired_leases(&self) -> Vec { + let mut expired_leases = vec![]; + let mut inner = self.inner.write(); + while let Some(expiry) = inner.expired_queue.peek() { + if *expiry <= Instant::now() { + #[allow(clippy::unwrap_used)] // queue.peek() returns Some + let id = inner.expired_queue.pop().unwrap(); + if inner.lease_map.contains_key(&id) { + expired_leases.push(id); + } + } else { + break; + } + } + expired_leases +} +\`\`\` + +When a lease is created, the expiration time of the lease is already calculated and inserted into the expired_queue. When calling find_expired_queue, the process continuously attempts to extract the expired leases from the head of the priority queue until it encounters the first one that has not yet expired. It then returns all the lease ID obtained in this process. + +### Lease Renewal + +If you want the created lease to last longer, you need to maintain a stream between the client and the server, where the client sends LeaseKeepAlive requests to the server at regular intervals. Unlike the previous requests, LeaseKeepAlive requests do not need to go through the consensus protocol because they rely on the expiration time of a lease that exists only on the leader node, so only the leader node can process LeaseKeepAlive requests, while the follower node forwards the request to the leader node for processing. The forwarding logic can be found in the source code of lease_server.rs. +After the stream is established between the leader and the client, whenever the leader receives a lease ID from the stream, it will renew the lease. The final renewal logic is realized by the renewal method provided by LeaseCollection. This method is defined as follows: + +\`\`\`bash +pub(crate) fn renew(&self, lease_id: i64) -> Result { + let mut inner = self.inner.write(); + let (expiry, ttl) = { + let Some(lease) = inner.lease_map.get_mut(&lease_id) else { + return Err(ExecuteError::lease_not_found(lease_id)); + }; + if lease.expired() { + return Err(ExecuteError::lease_expired(lease_id)); + } + let expiry = lease.refresh(Duration::default()); + let ttl = lease.ttl().as_secs().cast(); + (expiry, ttl) + }; + let _ignore = inner.expired_queue.update(lease_id, expiry); + Ok(ttl) +} +\`\`\` + +Renew will first check whether the corresponding lease has expired or not. If not, it will recalculate the expiration time, and then update its order in the expired_queue. +As long as the connection between the client and the server is not interrupted, the client will continue to send LeaseKeepAlive requests to the server via stream, preventing the lease from timing out. The primary application scenarios for leases, as mentioned in the previous section, almost always use this feature to determine whether the client is running normally. + +### Lease information reading + +Lease has two reading interfaces. One is LeaseTimeToLive, which will read the detailed information of a lease, including its expiration time. Same as LeaseKeepAlive, because the expiration time only exists in the leader node, so the request needs to be forwarded to only the leader for processing. +Another reading interface is LeaseLeases, which lists all the lease IDs in the system. This interface doesn't need information about the lease expiration time, so it can be handed over to the consensus protocol directly, which makes the processing in LeaseServer similar to that of LeaseGrant and LeaseRevoke. We wouldn’t go into further details here. +The ability of LeaseTimeToLive and LeaseLeases to read information is finally realized by LeaseCollection, the source code is as follows: + +\`\`\`rust +pub(crate) fn look_up(&self, lease_id: i64) -> Option { + self.inner.read().lease_map.get(&lease_id).cloned() +} + +pub(crate) fn leases(&self) -> Vec { + let mut leases = self + .inner + .read() + .lease_map + .values() + .cloned() + .collect::>(); + leases.sort_by_key(Lease::remaining); + leases +} +\`\`\` + +## 4. Summary + +In this article, we have introduced Lease, an important interface of Xline, which allows users to realize the on-time expiration of a set of keys and renew the lease through KeepAlive interface. This feature also allows the server to monitor the client's status. Relying on these features of the Lease mechanism, many typical application scenarios have been born, such as distributed locks, service registries, authorization management and so on, as described in this article. +The article also explains how users can utilize the Lease interface, and outlines the realization of key functionalities within this process. If you want to learn more about the detailed code, you can also refer to our open source repository: https://github.com/xline-kv/Xline . + +Xline is a geo-distributed KV storage for metadata management. the Xline project is written in Rust, and you are welcome to participate in our open source project! + +GitHub link: +https://github.com/xline-kv/Xline +Xline official website: www.xline.cloud +Xline Discord: +https://discord.gg/XyFXGpSfvb +`,$5=`--- + cover: /xline-home/blog/Implementation-of-CURP-Server/cover.jpg + author: + name: Jiawei Zhao + url: https://github.com/Phoenix500526 + img_url: https://avatars.githubusercontent.com/u/9337239?v=4 + read_time: 30 +--- + +In the previous article, An Introduction to the CURP Protocol, we gave a preliminary introduction to the CURP Protocol. Now, let’s continue from where we left off and delve into the internal workings of the CURP Server. + +--- + +## Organization of the Curp Crate’s Source Code + +Now, let’s focus on the curp consensus module. The curp module is a separate crate in Xline, with all of its source code stored in the curp directory, which is organized as follows: + +curp/proto: Holds the definition of the rpc interfaces and messages related to the curp protocol. + +curp/tla+: Holds content related to the tla+ specification of the curp protocol + +curp/tests: integration tests + +curp/src: the main implementation code of the CURP protocol, which can be divided into: + +client.rs: CURP client-side implementation. + +cmd.rs: defines key traits for interacting with external mods + +log_entry.rs: state machine log entries. + +rpc/: CURP server implementation of rpc methods. + +server/: CURP server-side implementation, including the following + +Key data structure definitions: cmd_board.rs, spec_pool.rs + +Key background tasks: cmd_worker/, gc.rs + +CURP server front and backend implementations: curp_node.rs, raw_curp/ + +storage/: implements the interface definition of the persistence layer, used to interact with the storage layer + +## Curp Server Architecture and Task Division + +After understanding the rpc services provided by Curp Server and the corresponding traits, let’s take a look at the architecture and startup process of Curp Server. + +![image1](/xline-home/blog/Implementation-of-CURP-Server/image1.png) + +Architecturally, the entire Curp Server can be divided into the front-end CurpNode and the back-end RawCurp. Such a design primarily aims to separate synchronous and asynchronous code. Regarding Rust’s asynchronous code: + +1. For tasks spawned by tokio, since the compiler inherently doesn’t know how long the task will run, it enforces that all tasks must have a ‘static lifetime. This often requires us to clone certain reference data structures. +2. Non-Send variables, like MutexGuard, are prohibited from crossing .await statements. When synchronous and asynchronous code are mixed, it necessitates manually releasing this MutexGuard before the await, either within a block or through an explicit drop. This leads to nested code structures, making it more challenging to read.By separating CurpNode (handling synchronous requests) and RawCurp (handling asynchronous requests), the code boundaries are more transparent, enhancing code readability. + +For insights on organizing asynchronous code gracefully in Rust projects, you can refer to another article: How to Gracefully Organize Asynchronous Code in Rust Projects. + +Within the CurpNode structure, there are spec_pool and cmd_board structures. The spec_pool corresponds to the witness structure in the CURP paper, responsible for storing commands executed in the fast path. In contrast, cmd_board stores the results of command executions. CurpNode can register a listener to cmd_board. Once the RawCurp backend asynchronously completes command execution, the result is inserted into cmd_board, and CurpNode is notified via the listener to return the command execution outcome to the user. When RawCurp receives a request from CurpNode, it inserts the command into the conflict detection queue — the conflict_checked_channel. + +As the name implies, a conflict_checked_channel is essentially an mpmc channel that accepts cmd’s from a CurpNode concurrently and dynamically maintains conflict relationships between different cmd’s to ensure that the commands a command worker receives from the channel will always conflict with the currently executing command. + +As the name suggests, the conflict_checked_channel is essentially an mpmc channel, capable of concurrently accepting cmds from CurpNode. It dynamically maintains the conflict relationships between different cmds, ensuring that commands retrieved by the command worker from the channel always not conflict with the currently executed commands. The command worker is the command execution entity. While the conflict_checked_channel focuses on relationships between various commands, the command worker is concerned with how to execute the commands. After the command worker completes the command and obtains the result, it inserts the result into cmd_board, triggering the listener and notifying CurpNode that the command execution is finished. + +## How Curp Server Interacts with Business Server + +From the architecture diagram mentioned earlier, we can see that the Curp consensus module provides a Curp Server, which offers rpc services externally. In Xline, the Business Servers make requests to Curp Server via rpc calls. Once the Curp Server processes the request, it notifies the Business Server through the corresponding trait. + +## Service Definitions + +Let’s first take a look at the services defined by Curp Server: + +\`\`\` +service Protocol { + rpc Propose (ProposeRequest) returns (ProposeResponse); + rpc WaitSynced (WaitSyncedRequest) returns (WaitSyncedResponse); + rpc AppendEntries (AppendEntriesRequest) returns (AppendEntriesResponse); + rpc Vote (VoteRequest) returns (VoteResponse); + rpc FetchLeader (FetchLeaderRequest) returns (FetchLeaderResponse); + rpc InstallSnapshot (stream InstallSnapshotRequest) returns (InstallSnapshotResponse); +} +\`\`\` + +The purposes of these services are: + +- Propose: To initiate a proposal request to the Curp cluster. +- WaitSynced: To wait for the Curp cluster to complete requests in the after-sync phase. +- AppendEntries: To initiate a request to the Curp cluster to append state machine logs. +- Vote: When a Curp Server initiates an election, it transitions its role to Candidate and uses this interface to send voting requests to other Curp Servers. If it receives a majority of positive responses, it becomes the leader; otherwise, it reverts to follower. +- FetchLeader: To retrieve the current leader node of the Curp cluster. +- InstallSnapshot: If a Curp Server’s state machine log lags significantly behind the leader, it can request a snapshot from the leader through this interface to catch up with the leader’s state machine log. Except for Propose and FetchLeader, the other services are primarily for internal use by Curp Server. The Business Servers fetch the current leader information via FetchLeader and makes proposals to the Curp cluster through Propose. + +## Interface Definitions + +Next, let’s see which traits are defined by the Curp module. From a design perspective, the traits defined in Curp can be divided into two categories: + +1. Command-related: Once the Curp module reaches a consensus on a specific command, it notifies the Business Server to execute the corresponding command via related traits. +2. Role-related: When the role of a Curp node changes, it notifies the corresponding business component (e.g., Lessor, Compactor) via related traits. + +### Command-related Traits + +The command-related traits defined in the Curp module mainly include Command, ConflictCheck, and CommandExecutor. Let’s first examine the Command and ConflictCheck traits, which are defined as: + +\`\`\`rust +pub trait ConflictCheck { + fn is_conflict(&self, other: &Self) -> bool; +} + +#[async_trait] +pub trait Command{ + /// omit some code... + + #[inline] + fn prepare(&self, e: &E, index: LogIndex) -> Result + where + E: CommandExecutor + Send + Sync, + { + >::prepare(e, self, index) + } + + #[inline] + async fn execute(&self, e: &E, index: LogIndex) -> Result + where + E: CommandExecutor + Send + Sync, + { + >::execute(e, self, index).await + } + + #[inline] + async fn after_sync( + &self, + e: &E, + index: LogIndex, + prepare_res: Self::PR, + ) -> Result + where + E: CommandExecutor + Send + Sync, + { + >::after_sync(e, self, index, prepare_res).await + } +}The Command trait describes a command entity that can be executed by Business Server. ConflictCheck detects whether conflicts exist between multiple commands. The conflict criterion is whether there’s an intersection between keys of two different commands. +\`\`\` + +Command defines four associated types (K, PR, ER, and ASR). Here, K represents the Key corresponding to the command, while ER and ASR correspond to the results of the command in the execute and after_sync phases of the Curp protocol, respectively. What does PR represent? PR denotes the result of the command in the prepare phase. + +To explain the need for a prepare phase, let’s consider an example. Since Xline employs the MVCC mechanism for multi-version management of key-value pairs, each key is assigned a revision. If a client sends two consecutive commands to Xline: PUT A=1 and PUT B=1 (denoted as cmd1 and cmd2) with expected revisions of 3 and 4, respectively, Xline can execute these two non-conflicting commands concurrently and out of order. If cmd2 finishes before cmd1, the revision order may be reversed, leading to errors. + +To solve this, a prepare phase is introduced to Command. Curp ensures that the execution in the prepare phase is serialized and always precedes the execute phase. By moving the revision calculation from the after_sync phase to the prepare phase, Xline ensures that the revision order matches the order of user requests arriving at Xline while still allowing for concurrent out-of-order execution of non-conflicting commands. + +Next, let’s look at the CommandExecutor trait definition: + +\`\`\`rust +#[async_trait] +pub trait CommandExecutor{ + fn prepare(&self, cmd: &C, index: LogIndex) -> Result; + + async fn execute(&self, cmd: &C, index: LogIndex) -> Result; + + async fn after_sync( + &self, + cmd: &C, + index: LogIndex, + prepare_res: C::PR, + ) -> Result; + + /// omit some code ... +} + +\`\`\` + +CommandExecutor describes the command execution entity. The Curp module uses it to notify the Business Server to execute related commands. + +The relationship among these three traits is: ConflictCheck describes the relationship between two different commands; the Curp Server cares only about whether commands conflict, not how they are executed. CommandExecutor describes how commands are executed without concerning themselves with their interrelationships. Their dependency is CommandExecutor ←> Command → ConflictCheck. + +### Traits for Role Change + +The role-related trait defined in Curp is RoleChange: + +\`\`\`rust +/// Callback when the leadership changes +pub trait RoleChange { + /// The \`on_election_win\` will be invoked when the current server win the election. + /// It means that the current server's role will change from Candidate to Leader. + fn on_election_win(&self); + + /// The \`on_calibrate\` will be invoked when the current server has been calibrated. + /// It means that the current server's role will change from Leader to Follower. + fn on_calibrate(&self); +} +\`\`\` + +In Xline’s Curp module, the protocol backend uses the Raft protocol. The so-called backend means that when a conflict occurs, the Curp module automatically falls back to the Raft protocol. In this scenario, the latency to reach a consensus is the same as the Raft protocol, both being 2 RTT. As we know, the original Raft paper defined three roles for nodes in a Raft cluster: Leader, Follower, and Candidate, with their transition relationships as follows: + +![image2](/xline-home/blog/Implementation-of-CURP-Server/image2.png) + +Initially, a node is a Follower. If it doesn’t receive any messages from the current cluster Leader within the election_timeout, including heartbeats or AppendEntries requests, it initiates an election operation and transitions to Candidate. If it wins the election, it becomes the Leader; otherwise, it reverts to the Follower. If a network partition occurs, two Leaders might emerge. Once the network partition resolves, the Leader with a smaller term will calibrate itself upon receiving any message from the Leader with a larger term, updating its term and transitioning to the Follower. + +Why does Xline need to define a trait like RoleChange? In some Xline business scenarios, some components, like LeaseServer and LeaseStore, perform different operations on Leader node and non-Leader nodes. Thus, when a node’s role changes, the corresponding components need to be notified. Currently, because Lease-related components only differentiate between Leader and non-Leader nodes, the defined callback only covers the election_win and calibrate events. If future business requires finer-grained role differentiation, more callback methods will be added to cover those requirements. + +## How Curp Server Handles Requests + +Let’s assume there are two PutRequests: PUT A=1 and PUT A=2. Let’s see how the curp server handles these conflicting requests. As mentioned earlier, users need to initiate a proposal to Curp Server through the propose method of the Curp Client. Let’s first look at the pseudocode implementation of propose. + +\`\`\`rust +/// Propose the request to servers +#[inline] +pub async fn propose(&self, cmd: C) -> Result { + // create two futures + let fast_round = self.fast_round(cmd); + let slow_round = self.slow_round(cmd); + + // Wait for the fast and slow round at the same time + match which_one_complete_first(fast_round, slow_round).await { + fast_round returns fast_result => { + let (fast_er, success) = fast_result?; + if success { + Ok(fast_er.unwrap()) + } else { + let (_asr, er) = wait for slow_round to finish; + Ok(er) + } + } + slow_round returns slow_result => match slow_result { + Ok((_asr, er)) => Ok(er), + Err(e) => { + if let Ok((Some(er), true)) = wait for fast_round to finish { + return Ok(er); + } + Err(e) + } + }, + } +} +\`\`\` + +As the code suggests, when a Client calls propose, it simultaneously starts two different futures, namely fast_round and slow_round, corresponding to the fast path and slow path of the Curp protocol, respectively. The process waits for one of the futures to complete. Clearly, when the first request arrives, there will be no conflict with other requests. Thus, it can be assumed that this request will be processed during the fast round. Let’s first look at the implementation of fast_round. + +## Curp Consensus Process — Fast Round + +The fast_round code is defined in curp/src/client, corresponding to the frontend process of the Curp protocol. + +\`\`\`rust +/// The fast round of Curp protocol +/// It broadcasts the requests to all the curp servers. +async fn fast_round( + &self, + cmd_arc: Arc, +) -> Result<(Option<::ER>, bool), ProposeError> { + let request = create a new ProposeRequest; + let mut rpcs = broadcast request to each node and put responses into a stream; + + let mut ok_cnt: usize = 0; + let mut execute_result: Option = None; + let superquorum = superquorum(self.connects.len()); + + while let Some(resp_result) = rpcs.next().await { + let resp = match resp_result { + Ok(resp) => resp.into_inner(), + Err(e) => { + warn!("Propose error: {}", e); + continue; + } + }; + + update_state(resp.term, resp.leader_id); + + resp.map_or_else::( + |er| { + if let Some(er) = er { + execute_result = Some(er); + } + ok_cnt += 1; + Ok(()) + }, + |err| { + if let ProposeError::ExecutionError(_) = err { + return Err(err); + } + Ok(()) + }, + )??; + if (ok_cnt >= superquorum) && execute_result.is_some() { + return Ok((execute_result, true)); + } + } + Ok((execute_result, false)) +} +\`\`\` + +Overall, the logic of fast_round can be divided into three steps: + +1. Wrap Command into the corresponding ProposeRequest. +2. Broadcast the ProposeRequest to all nodes in the Curp cluster. +3. Summarize the results. If the current Command doesn’t conflict with the others, a successful execution result will be obtained. If the number of successful ProposeResponses received exceeds the super quorum (approximately 3/4 of the cluster node count), the command is deemed successfully executed; otherwise, it fails. + +Some readers might wonder why, in a distributed cluster with 2f + 1 nodes, consensus protocols like Raft or Paxos only need f + 1 nodes to return a successful response, but Curp requires more than f + f/2+1 nodes to return successful responses in the fast path. Here, f represents the fault tolerance of the cluster. To understand this discrepancy, let’s consider what would happen if the Curp protocol also used f+1as the criterion for success in the fast path. + +Assume Client_A broadcasts ProposeRequest (marked as A) to 2f + 1 nodes and receives f + 1 successful responses. There must be one leader node among them, with the remaining f nodes being followers. Suppose f nodes, including the leader, crashed and all had request A. Among the remaining f+1 nodes, only one follower retains request A in its in-memory spec_pool. Then, the client broadcasts another ProposeRequest (marked as B, conflicting with A). Since each node uses its in-memory spec_pool to determine whether incoming requests conflict with speculatively executed requests, even though Client_B won’t receive a successful result, request B will still be saved in the spec_pool of f nodes. If the leader node recovers and replays all requests saved in spec_pool across all nodes to restore the state machine (a process we call “recover”), the originally executed request A becomes the minority, while the unsuccessfully executed request B becomes the majority. This leads to an error during the leader’s recovery process. + +When the Curp protocol usesf+ f/2+ 1 as the criterion for success in the fast path, even if all f nodes containing request A crash, there are still more than half the nodes in the remaining f + 1 nodes that retain the request. This ensures that a later conflicting request will not outnumber the originally successfully executed request. + +Returning to our example, since Curp Server didn’t encounter conflicts when processing the request PUT A=1, it smoothly completes in the fast_round. For the Leader node, the request goes through CurpNode, to RawCurp, to the conflict detection queue Conflict_Checked_MPMC, and finally handed over to cmd_worker for execution. After the cmd_worker executes PUT A=1, it inserts the corresponding result into cmd_board, notifying CurpNode to return the command execution response to the Client. The following diagram depicts the sequence of events in the fast_round process. + +![image3](/xline-home/blog/Implementation-of-CURP-Server/image3.png) + +## Curp Consensus Process — Slow Round + +When the Client sends the request PUT A=2 to the Curp Server, as known from the previous propose method, the Client will simultaneously start both the fast_round and slow_round futures. Clearly, since the request PUT A=2 is in obvious conflict with the previous request PUT A=1, fast_round cannot be successfully executed, hence waiting for the completion of slow_round. The code for slow_round is defined in curp/src/client, corresponding to the backend process of the Curp protocol, i.e., the wait_synced process. + +\`\`\`rust +/// The slow round of Curp protocol +async fn slow_round( + &self, + cmd: Arc, +) -> Result<(::ASR, ::ER), ProposeError> { + loop { + let leader_id = self.get_leader_id().await; + + let resp = match call wait_synced from leader node { + Ok(resp) => resp.into_inner(), + Err(e) => { + wait for retry_timeout to retry propose again; + continue; + } + }; + + match resp? { + SyncResult::Success { er, asr } => { + return Ok((asr, er)); + } + SyncResult::Error(Redirect(new_leader, term)) => { + let new_leader = new_leader.and_then(|id| { + update_state(new_leader, term) + }) + }); + self.resend_propose(Arc::clone(&cmd), new_leader).await?; // resend the propose to the new leader + } + SyncResult::Error(Timeout) => { + return Err(ProposeError::SyncedError("wait sync timeout".to_owned())); + } + SyncResult::Error(e) => { + return Err(ProposeError::SyncedError(format!("{e:?}"))); + } + } + } +}Overall, the slow_round logic can also be divided into two steps: +\`\`\` + +1. Obtain the current leader of the cluster and send a WaitSyncedRequest to it. +2. Wait for the leader to return the execution result of WaitSyncedRequest. If failed, wait for retry_timeout and try again. + +In the Client’s propose method, because fast_round determines that the newly arrived request conflicts with the previously speculatively executed request, RawCurp will first save this Command in the state machine log and initiate an AppendEntries request to the cluster. After completion, it will return a ProposeError::KeyConflict error to the client, waiting for the end of slow_round. After the Leader completes the AppendEntries operation to the Followers in the cluster, the apply operation will be performed to apply the log to the state machine. It’s during this process that the leader will send the Command to the conflict detection queue, Conflict_Checked_MPMC. Only after the cmd_worker has executed all commands conflicting with PUT A=2 can the PUT A=2 command be popped from the conflict detection queue for execution. Unlike fast_round, in the slow_round process, after the command is executed and the execution result is saved in cmd_board, it will not return directly. Instead, the command will be put back into the conflict detection queue until the command completes the after_sync operation and saves the corresponding result to cmd_board. Only then will it return to CurpNode and finally return the corresponding ProposeResponse to the Client. The sequence diagram for the entire slow_round operation is as follows: + +![image4](/xline-home/blog/Implementation-of-CURP-Server/image4.png) + +## Summary + +In this article, we discussed how the Curp Server in Xline interacts with the business Servers. The business Server initiates requests to the Curp Server through the RPC interfaces predefined by Curp Server. Curp Server, on the other hand, notifies the business Server through two different types of traits. The command-related Traits, such as Command, ConflictCheck, and CommandExecutor, are mainly responsible for notifying the business Server after reaching consensus on commands. The RoleChange trait mainly notifies the business Server when the role of a cluster node changes. + +In Xline, the Curp Server is divided into two parts: the front-end CurpNode and the backend RawCurp. CurpNode mainly handles synchronous RPC call requests and forwards the requests to RawCurp for asynchronous execution. RawCurp submits commands to the conflict_checked_channel, with the command workers responsible for execution. 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e.items)t.sep&&!t.value&&!Cr(t.start,"explicit-key-ind")&&!Cr(t.sep,"map-value-ind")&&(t.key&&(t.value=t.key),delete t.key,R7(t.value)?t.value.end?Array.prototype.push.apply(t.value.end,t.sep):t.value.end=t.sep:Array.prototype.push.apply(t.start,t.sep),delete t.sep)}let q1=class{constructor(t){this.atNewLine=!0,this.atScalar=!1,this.indent=0,this.offset=0,this.onKeyLine=!1,this.stack=[],this.source="",this.type="",this.lexer=new N7,this.onNewLine=t}*parse(t,n=!1){this.onNewLine&&this.offset===0&&this.onNewLine(0);for(const r of this.lexer.lex(t,n))yield*this.next(r);n||(yield*this.end())}*next(t){if(this.source=t,this.atScalar){this.atScalar=!1,yield*this.step(),this.offset+=t.length;return}const n=A7(t);if(n)if(n==="scalar")this.atNewLine=!1,this.atScalar=!0,this.type="scalar";else{switch(this.type=n,yield*this.step(),n){case"newline":this.atNewLine=!0,this.indent=0,this.onNewLine&&this.onNewLine(this.offset+t.length);break;case"space":this.atNewLine&&t[0]===" 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