swift-clusterd PoC which serves as seed node #1155
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ktoso
changed the title
akbashev
reviewed
Aug 27, 2024
| @Option(help: "The host address to bid the cluster daemon on.") | ||
| var host: String = ClusterDaemon.defaultEndpoint.host | ||
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| mutating func run() async throws { |
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Should not be mutating? 🤔
| daemon.system.log.warning("RUNNING ClusterD DEBUG binary, operation is likely to be negatively affected. Please build/run the ClusterD process using '-c release' configuration!") | ||
| #endif | ||
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| try await daemon.system.park() |
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await is not needed, for now at least
| @@ -404,31 +404,65 @@ protocol ClusterSystemInstrumentationProvider { | |||
| /// all the nodes of an existing cluster. | |||
| public struct ServiceDiscoverySettings { | |||
| let implementation: ServiceDiscoveryImplementation | |||
| private let _initialize: (ClusterSystem) -> Void | |||
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A bit unclear naming, took some time to figure out, guess something more specific about cluster daemon, like _initializeClusterd. Wonder also if it should be optional and only set in init(clusterdEndpoint: Cluster.Endpoint), otherwise again—not very clear function.
| } | ||
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| /// Locate the default `ClusterD` process and use it for discovering cluster nodes. | ||
| public static func clusterd(endpoint: Cluster.Endpoint?) -> Self { |
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That's neat, my initial impression was it's for local clustering, but guess we can define any endpoint.
| "MultiNodeTestKit", | ||
| .product(name: "ArgumentParser", package: "swift-argument-parser"), | ||
| ] | ||
| ), | ||
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| .executableTarget( | ||
| name: "Clusterd", |
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Let's rename to swift-clusterd now? Or at least lowercased clusterd would be better.
Draft
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Quick PoC how a
clusterddaemon could look like.Usage in practice would be to just ensure we start the daemon OR if ANY of the nodes is using daemon discovery make sure one of them spawns it or something like that.
This way nodes can join without hardcoding discovery of peer nodes when playing around locally.
This is inspired by https://forums.swift.org/t/beginner-advice-for-distributed-distributedcluster-modules/72391/11 and erlang's shortnames + https://www.erlang.org/docs/25/man/epmd
Creating a few nodes in a system would literarily be:
this basically just does:
This is the same as epmd, it has to be running somewhere.
And applications just do:
and you're done:
they'll join eachother.
Follow up here:
ClusterDshould be a "HIDDEN" member in the membershipswift-clusterd(the cluster daemon for the swift distributed cluster)resolves #1152