Wen restart aggregate last voted fork slots #33892

wen-coding · 2023-10-27T05:20:55Z

Problem

Aggregate RestartLastVotedForkSlots in wen_restart and repair if necessary.

Summary of Changes

Aggregate RestartLastVotedForkSlots
Repair all blocks with more than 42% of stakes
If 80% of the validators reported RestartLastVotedForkSlots and blocks with more than 42% of the stakes have been repaired, proceed to next step
Write progress into protobuf file for further debugging

The Gossip changes are being reviewed separately in #33613.

…ed_fork_slots

codecov · 2023-10-27T07:27:24Z

Codecov Report

Attention: Patch coverage is 94.21222% with 54 lines in your changes are missing coverage. Please review.

Project coverage is 81.8%. Comparing base (7399178) to head (59fd5ff).
Report is 10 commits behind head on master.

❗ Current head 59fd5ff differs from pull request most recent head 40c0fb6. Consider uploading reports for the commit 40c0fb6 to get more accurate results

Additional details and impacted files

@@           Coverage Diff            @@
##           master   #33892    +/-   ##
========================================
  Coverage    81.7%    81.8%            
========================================
  Files         836      835     -1     
  Lines      224834   225690   +856     
========================================
+ Hits       183847   184687   +840     
- Misses      40987    41003    +16

AshwinSekar

Took an initial pass, will review the aggregate logic next.

I think if you wanted to you could split this PR into the repair changes that consume slots_to_repair_for_wen_restart and then the part that updates it.

core/src/repair/repair_service.rs

core/src/shred_fetch_stage.rs

wen-restart/src/wen_restart.rs

- Avoid waiting after first shred when repair is in wen_restart

core/src/repair/repair_service.rs

…than shred_fetch_stage.

jbiseda

I took a first pass and have some suggestions.

jbiseda · 2023-11-15T23:10:12Z

core/src/repair/repair_service.rs

@@ -630,7 +646,7 @@ impl RepairService {
                    * timestamp().saturating_sub(slot_meta.first_shred_timestamp)
                    / 1_000;
                if ticks_since_first_insert
-                    < reference_tick.saturating_add(DEFER_REPAIR_THRESHOLD_TICKS)
+                    < reference_tick.saturating_add(defer_repair_threshold_ticks)


Should we bypass the reference_tick comparison completely if add_delay_after_first_shred == false?

jbiseda · 2023-11-15T23:18:23Z

core/src/repair/repair_service.rs

@@ -613,7 +622,14 @@ impl RepairService {
        slot: Slot,
        slot_meta: &SlotMeta,
        max_repairs: usize,
+        add_delay_after_first_shred: bool,


nit: maybe change name to throttle_requests_by_shred_tick?

jbiseda · 2023-11-15T23:20:16Z

core/src/repair/repair_service.rs

@@ -668,6 +684,7 @@ impl RepairService {
                    slot,
                    &slot_meta,
                    max_repairs - repairs.len(),
+                    true,


nit: could you add the param name in a comment like /*add_delay_after_first_shred*/ true for readability?

jbiseda · 2023-11-15T23:22:29Z

core/src/repair/repair_service.rs

@@ -213,6 +213,8 @@ pub struct RepairInfo {
    pub repair_validators: Option<HashSet<Pubkey>>,
    // Validators which should be given priority when serving
    pub repair_whitelist: Arc<RwLock<HashSet<Pubkey>>>,
+    // A given list of slots to repair when in wen_restart
+    pub slots_to_repair_for_wen_restart: Option<Arc<RwLock<Vec<Slot>>>>,


suggestion: s/slots_to_repair_for_wen_restart/wen_restart_repair_slots/ for brevity

jbiseda · 2023-11-15T23:37:03Z

core/src/tvu.rs

@@ -205,6 +206,7 @@ impl Tvu {
                repair_whitelist: tvu_config.repair_whitelist,
                cluster_info: cluster_info.clone(),
                cluster_slots: cluster_slots.clone(),
+                slots_to_repair_for_wen_restart: slots_to_repair_for_wen_restart.clone(),


do you need to clone() here?

Actually I don't now, removed.

jbiseda · 2023-11-16T01:08:55Z

wen-restart/src/last_voted_fork_slots_aggregate.rs

+        let mut slots_stake_map = HashMap::new();
+        for slot in last_voted_fork_slots {
+            if slot <= &root_slot {
+                break;


is last_voted_fork_slots always sorted?

Yes it's sorted in Gossip code.

would be good to add an assert here that it's sorted to make the assumptions explicit

The problem is that if it's not sorted, assertion doesn't help you because you exited early already. I'm letting it loop on all slots, a loop on vec should be really fast.

jbiseda · 2023-11-16T18:41:19Z

wen-restart/src/wen_restart.rs

+    Ok(())
+}
+
+fn aggregate_restart_last_voted_fork_slots(


I think exit from Validator:new should be piped down to this level so the loop can be interrupted.

jbiseda · 2023-11-16T18:57:45Z

wen-restart/src/wen_restart.rs

+        RestartState::Init => RestartState::LastVotedForkSlots,
+        RestartState::LastVotedForkSlots => RestartState::HeaviestFork,
+        RestartState::HeaviestFork => RestartState::Done,
+        _ => panic!("Unexpected state {:?}", new_progress.state()),


nit: s/_/RestartState::Done so compilation will break if a new enum value is added.

wen-restart/src/wen_restart.rs

jbiseda · 2023-11-16T19:18:09Z

gossip/src/crds_value.rs

-    pub fn new(from: Pubkey, now: u64, last_voted_hash: Hash, shred_version: u16) -> Self {
-        Self {
+    // This number is MAX_CRDS_OBJECT_SIZE - empty serialized RestartLastVotedForkSlots.
+    const MAX_SPACE: usize = 824;


You may be able to define this in terms of the other constants and use const_assert_eq!() to make this less fragile. There are some similar patterns in legacy.rs.

Okay, I'll take a look.

wen-restart/src/wen_restart.rs

carllin · 2024-02-04T00:43:58Z

wen-restart/src/wen_restart.rs

+        {
+            *wen_restart_repair_slots.write().unwrap() = filtered_slots;
+        }
+        write_wen_restart_records(wen_restart_path, progress)?;


Isn't this write handled by the caller in wait_for_wen_restart()?

solana/wen-restart/src/wen_restart.rs

Line 220 in 1ceda56

increment_and_write_wen_restart_records(wen_restart_path, &mut progress)?;

For less complicated code and more modular testing, I think:

We leave all the record keeping into pub fn wait_for_wen_restart(), so wen_restart_path never needs to be passed into these state transition functions. This also means for testing we don't have to continually test for all errors that records are written to wen_restart_path (we only need one test for that), we just have to test that the inner state transition function returns the expected state.

Each of the state transition functions called here

solana/wen-restart/src/wen_restart.rs

Lines 197 to 219 in 1ceda56

RestartState::Init => send_restart_last_voted_fork_slots(

last_vote.clone(),

blockstore.clone(),

cluster_info.clone(),

&mut progress,

)?,

RestartState::LastVotedForkSlots => aggregate_restart_last_voted_fork_slots(

wen_restart_path,

wait_for_supermajority_threshold_percent,

cluster_info.clone(),

bank_forks.clone(),

wen_restart_repair_slots.clone().unwrap(),

exit.clone(),

&mut progress,

)?,

RestartState::HeaviestFork => {

warn!("Not implemented yet, make it empty to complete test")

}

RestartState::FinishedSnapshot => return Err("Not implemented!".into()),

RestartState::GeneratingSnapshot => return Err("Not implemented!".into()),

RestartState::WaitingForSupermajority => return Err("Not implemented!".into()),

RestartState::Done => return Ok(()),

}

should return a custom error type. For instance aggregate_restart_last_voted_fork_slots() should have an enum AggregateForksError(). This achieves a few things:

For debugging, we know where each of the errors originated

For testing, we can just test that every error returns the expected state. Then from 1. above, we don't have to worry about testing that that it's written to wen_restart_path

I originally put all book keeping in wait_for_wen_restart, but then realized that AggregateLastVotedForkSlots might span several hours when we wait for validators to join the restart, then I decided we want to write received LastVotedForkSlots inside this loop so we can speed up internal state population in case the validator restarts.

What's your take on this? We can of course rely on others sending us the Gossip messages as well.

Another reason we do want to keep record of the Gossip messages we received is that we can maybe debug later why the restart didn't work.

Instead of adding one error type per internal function, I added one WenRestartError for all functions in the crate, so we can do ?; everywhere. How does this look?

I originally put all book keeping in wait_for_wen_restart, but then realized that AggregateLastVotedForkSlots might span several hours when we wait for validators to join the restart, then I decided we want to write received LastVotedForkSlots inside this loop so we can speed up internal state population in case the validator restarts.

You're totally right, let's keep the record writing inside the function then, and test those records are properly written

Instead of adding one error type per internal function, I added one WenRestartError for all functions in the crate, so we can do ?; everywhere. How does this look?

Think it's better to still organize per state transition for testing, see comment below

carllin · 2024-02-07T19:07:44Z

wen-restart/src/wen_restart.rs

+    #[error("Protobuf Decode error: {0}")]
+    DecodeError(#[from] prost::DecodeError),
+    #[error("Protobuf Encode error: {0}")]
+    EncodeError(#[from] prost::EncodeError),
+    #[error("Exiting")]
+    Exiting,
+    #[error("Invalid Last Vote Type: {0:?}")]
+    InvalidLastVoteType(VoteTransaction),
+    #[error("File IO error: {0}")]
+    IoError(#[from] std::io::Error),
+    #[error("Missing last voted fork slots")]
+    MissingLastVotedForkSlots,
+    #[error("Hash parse error: {0}")]
+    ParseHashError(#[from] solana_sdk::hash::ParseHashError),
+    #[error("Pubkey parse error: {0}")]
+    PubkeyParseError(#[from] solana_sdk::pubkey::ParsePubkeyError),
+    #[error("Gossip push RestartLastVotedForkSlotsError: {0}")]
+    RestartLastVotedForkSlotsError(#[from] RestartLastVotedForkSlotsError),
+    #[error("Unexpected state: {0:?}")]
+    UnexpectedState(wen_restart_proto::State),


I think it would be better to organize these by state transition:

pub enum SendLastVotedForkError { } pub enum LastVotedForkSlotsError { }

Then wait_for_wen_restart() still returns Box<dyn std::error::Error>

For testing for each state transition, we make sure all of their particular errors write properly to the record and we can restart

Hmm, when you say "write properly to the record", do you mean writing to the logs or to the protobuf as well? Since some of the errors might be transient, I didn't plan to write the errors to the protobuf.

Oh I didn't mean write the error out. I mean the progress data structure you write is what you expect after the error happens.

For every single error, for every single state transition

I did the change but it actually felt wrong IMHO, several reasons:

complicating public API for the sake of testing
pub enum xxxError is public interface, if you think about how it's used, all people see from outside the module is wait_for_wen_restart, so it feels natural to have WenRestartError returned, it feels unnatural to have several Error enum returned, leaking our implementation details (which they shouldn't care about).

harder to write tests
I could of course test each function individually, but I do have to test they work in wait_for_wen_restart. If I only need to test is_err() then it's all fine, but if I want to test for specific error (e.g. file permission wrong), I had to do a downcast on dyn error, I had to constantly look back to error definitions to see what type of error I'm now expecting

common functions harder to implement and change
The fact that we do need to write the protobuf means I need to call write_wen_restart() from several places, but they will return different xxxError types, so I need to create yet another WriteWenRestartError and convert to other Error types, this is code duplication and unnecessary conversion. If we move part of the function to another internal method, we need to create yet another Error struct?

All in all, this feels wrong, maybe I'm misunderstanding what you described.

pub enum xxxError is public interface, if you think about how it's used, all people see from outside the module is wait_for_wen_restart, so it feels natural to have WenRestartError returned, it feels unnatural to have several Error enum returned, leaking our implementation details (which they shouldn't care about).

Here we're not writing a standalone library so I think a boxed error is fine. The purpose of this error is to make attribution of errors/debugging easier, which categorizing the errors does. We can now trace exactly which step in the restart went wrong. I think we could also introduce a top level WenRestartError that wraps the errors like so:

enum WenRestartError { SendLastVotedForkError(SendLastVotedForkError), AggregateLastVotedForkSlotsError(AggregateLastVotedForkSlotsError), ... }

I could of course test each function individually, but I do have to test they work in wait_for_wen_restart. If I only need to test is_err() then it's all fine, but if I want to test for specific error (e.g. file permission wrong), I had to do a downcast on dyn error, I had to constantly look back to error definitions to see what type of error I'm now expecting

Hmm I don't think you have to test every error case in wait_for_wen_restart(). I think if the state transition functions are a-> b -> c, then:

You just have to test that each transition a, b, and c individually will run successfully to "completion" across all cases. "Completion" in this case means the ending output passes the verification for the initial input of the next state transition. Concretely this means testing in the happy case the state is correct, and that on all declared errors, they can recover and then run to completion.

From 1, inductively, you can then conclude that a -> b -> c will run correctly.

All you need to test then in wait_for_wen_restart() is that the order of calls a -> b -> c is correct and the arguments are being passed correctly. Concretely this means just testing one happy path.

The fact that we do need to write the protobuf means I need to call write_wen_restart() from several places, but they will return different xxxError types, so I need to create yet another WriteWenRestartError and convert to other Error types, this is code duplication and unnecessary conversion. If we move part of the function to another internal method, we need to create yet another Error struct?

I think a unique error for write_wen_restart is fine, it is just a suberror of each state transition. This way we know which step the write failed in.

Thinking about it more, I think I agree that failures should be tested on individual functions rather than wait_on_wen_restart(), so I changed accordingly.

The only thing I'm hesitating is that I still don't see how splitting WenRestartError into individual errors helps us. If the proto file is suddenly not writable, we need to solve that problem no matter what stage WenRestart is in, so I don't think replicating file IO errors everywhere really helps the user, it just complicates the public API.

How about this, we guarantee no errors on the state transitions 😄 . I.e. we guarantee the state going in and the state coming out of the records are always valid.

All of the current errors are verification errors on the initial state:

solana/wen-restart/src/wen_restart.rs

Lines 88 to 92 in 645452f

return Err(WenRestartError::MissingLastVotedForkSlots);

}

} else {

return Err(WenRestartError::InvalidLastVoteType(last_vote));

}

and
https://github.com/solana-labs/solana/pull/33892/files#diff-c32a5c15bdd23820489e6f8af8b305aee344228d0cb6789e554a988d57d54bd7R70-R71. These validations can be done in the beginning on entry into the state machine in wait_for_wen_restart, as a validate_state_1(), validate_state_2(), etc. These can then be unit tested. Ideally I think we would change WenRestartProgress to be an enum with a separate state for each step in this state machine, i.e.

enum WenRestartProgress { Init, SendForkSlots(SendForkSlots), AggregateForkslots(AggregateForkSlots), }

and then at the end of each state transition we just spit out the next iteration of the enum

Then the only acceptable error is logging errors which we can then enforce is the only acceptable error.

Then if we test that write_wen_restart_records() either writes a whole valid record OR doesn't write a record/i.e. errors, then we know the state must always be valid.

I can move the initialization errors into initialize(), but I can't guarantee there are no other errors after initialize(). For example, push_restart_last_voted_fork_slots() could return error. And we might want to throw out error in the future while running.

you're right on this 😃

If we don't want a separate enum per state transition, then at minimum I would like to be able to print out the backtrace of where that error occurred. Maybe this: https://stackoverflow.com/questions/75060346/how-can-i-get-file-and-line-number-where-an-error-was-returned

Changed to anyhow instead of thiserror for backtrace, also moved initialization errors into initialize().

This reverts commit 4c920cb.

carllin · 2024-02-20T19:56:53Z

wen-restart/src/wen_restart.rs

+        }
+        None => {
+            // repair and restart option does not work without last voted slot.
+            if let VoteTransaction::Vote(ref vote) = last_vote {


Will this error for validators who have a default tower at startup and haven't voted yet?

The default tower has an empty slots list, so it will not fail on line 91, instead it will fail on line 88.

Is that what we want or do we want validators with a default tower to be able to perform this restart as well?

Hmm, if you have no last vote information, not sure you can contribute anything to the restart. I guess those guys can copy the generated snapshot like today. Or we can try to use information from the ledger if tower is not available?

I think that's fine, we should have a clear error message telling those guys they need to wait then.

I think it would be a better user experience if you verified the tower beforehand and printed a clear error message if the tower is not valid/missing

That's a good point, I added some error log there, see if this helps?

carllin · 2024-03-01T22:16:04Z

wen-restart/src/wen_restart.rs

+                                Cannot find last voted slot in the tower storage, it either means that this node has never \
+                                voted or the tower storage is corrupted. Unfotunately, since WenRestart is a consensus protocol \
+                                depending on each participant to send their last voted fork slots, your validator cannot participate.\
+                                Please wait in the discord channel for the result of WenRestart, then generate a snapshot and use \
+                                --wait-for-supermajority to restart the validator.");


Unfotunately->Unfortunately

carllin · 2024-03-01T22:18:25Z

wen-restart/src/wen_restart.rs

+                                Cannot find last voted slot in the tower storage, it either means that this node has never \
+                                voted or the tower storage is corrupted. Unfotunately, since WenRestart is a consensus protocol \
+                                depending on each participant to send their last voted fork slots, your validator cannot participate.\
+                                Please wait in the discord channel for the result of WenRestart, then generate a snapshot and use \


Nit: Please check discord for the conclusion of the WenRestart protocol, then generate a snapshot and use...

carllin · 2024-03-01T22:23:42Z

wen-restart/src/wen_restart.rs

+        )
+        .err()
+        .unwrap()
+        .to_string()


Can we remove this .err().unwrap().to_string() pattern from all the tests? We can just do an

assert_eq!(initialize(), Err()) or assert!(matches!(result, Err())

Unfortunately you can't directly use assert_eq or even assert_match on anyhow::Error:
https://users.rust-lang.org/t/issues-in-asserting-result/61198/5

I have to use a unwrap_error().downcast().unwrap(), would you prefer that instead?

wow so ugly 🤮

yeah, I think let's downcast and match on the actual error.

wen-coding and others added 8 commits October 25, 2023 11:30

Push and aggregate RestartLastVotedForkSlots.

47f8891

Fix API and lint errors.

a8d0c08

Reduce clutter.

f7b8232

Put my own LastVotedForkSlots into the aggregate.

f5f71b4

Merge branch 'solana-labs:master' into wen_restart_aggregate_last_vot…

630cc70

…ed_fork_slots

Write LastVotedForkSlots aggregate progress into local file.

ce32c03

Fix typo and name constants.

b90185d

Fix flaky test.

3c819f0

wen-coding requested review from carllin and AshwinSekar October 27, 2023 06:24

Clarify the comments.

e21efe3

AshwinSekar reviewed Nov 8, 2023

View reviewed changes

- Use constant for wait_for_supermajority

b24b8db

- Avoid waiting after first shred when repair is in wen_restart

AshwinSekar reviewed Nov 8, 2023

View reviewed changes

core/src/repair/repair_service.rs Outdated Show resolved Hide resolved

wen-coding and others added 6 commits November 8, 2023 16:07

Fix delay_after_first_shred and remove loop in wen_restart.

a2204f3

Read wen_restart slots inside the loop instead.

0c1ef0f

Merge branch 'master' into wen_restart_aggregate_last_voted_fork_slots

b9324c8

Discard turbine shreds while in wen_restart in windows insert rather …

122314d

…than shred_fetch_stage.

Merge branch 'master' into wen_restart_aggregate_last_voted_fork_slots

e1252a4

Merge branch 'master' into wen_restart_aggregate_last_voted_fork_slots

31ca285

AshwinSekar requested a review from jbiseda November 15, 2023 20:36

jbiseda reviewed Nov 16, 2023

View reviewed changes

wen-coding and others added 7 commits November 16, 2023 12:41

Merge branch 'master' into wen_restart_aggregate_last_voted_fork_slots

c3ab972

Use the new Gossip API.

8fc2327

Rename slots_to_repair_for_wen_restart and a few others.

229f447

Rename a few more and list all states.

bc1b4b5

Pipe exit down to aggregate loop so we can exit early.

8743b5c

Merge branch 'master' into wen_restart_aggregate_last_voted_fork_slots

4ebbde8

Fix import of RestartLastVotedForkSlots.

0d82a7c

wen-coding added 2 commits January 31, 2024 15:34

Wait on expected progress message in proto file instead of sleep.

0620aaf

Merge branch 'master' into wen_restart_aggregate_last_voted_fork_slots

1ceda56

carllin reviewed Feb 4, 2024

View reviewed changes

wen-coding added 3 commits February 4, 2024 16:50

Code reorganization and cleanup.

93abe45

Make linter happy.

cb1788e

Add WenRestartError.

72a732e

carllin reviewed Feb 7, 2024

View reviewed changes

wen-coding added 4 commits February 7, 2024 14:20

Split WenRestartErrors into separate erros per state.

4c920cb

Revert "Split WenRestartErrors into separate erros per state."

bf71c9b

This reverts commit 4c920cb.

Merge branch 'master' into wen_restart_aggregate_last_voted_fork_slots

056aef7

Use individual functions when testing for failures.

645452f

carllin reviewed Feb 20, 2024

View reviewed changes

wen-coding added 2 commits February 27, 2024 23:45

Move initialization errors into initialize().

f46e62a

Use anyhow instead of thiserror to generate backtrace for error.

e3d0194

wen-coding force-pushed the wen_restart_aggregate_last_voted_fork_slots branch from 10d4afa to e3d0194 Compare February 29, 2024 04:18

wen-coding added 4 commits February 28, 2024 20:22

Add missing Cargo.lock.

ffbb20c

Merge branch 'master' into wen_restart_aggregate_last_voted_fork_slots

3b50964

Add error log when last_vote is missing in the tower storage.

59fd5ff

Merge branch 'master' into wen_restart_aggregate_last_voted_fork_slots

e7c320c

wen-coding requested a review from carllin March 1, 2024 17:30

Merge branch 'master' into wen_restart_aggregate_last_voted_fork_slots

9ccf5ca

carllin reviewed Mar 1, 2024

View reviewed changes

Change error log info.

021dbe9

carllin reviewed Mar 1, 2024

View reviewed changes

Change test to match exact error.

40c0fb6

carllin approved these changes Mar 2, 2024

View reviewed changes

wen-coding merged commit bfe44d9 into solana-labs:master Mar 2, 2024
46 checks passed

wen-coding deleted the wen_restart_aggregate_last_voted_fork_slots branch March 2, 2024 02:52

wen-coding mentioned this pull request Apr 2, 2024

wen_restart: Find the bank hash of the heaviest fork, replay if necessary. anza-xyz/agave#420

Merged

wen-coding self-assigned this Apr 30, 2024

	RestartState::Init => send_restart_last_voted_fork_slots(
	last_vote.clone(),
	blockstore.clone(),
	cluster_info.clone(),
	&mut progress,
	)?,
	RestartState::LastVotedForkSlots => aggregate_restart_last_voted_fork_slots(
	wen_restart_path,
	wait_for_supermajority_threshold_percent,
	cluster_info.clone(),
	bank_forks.clone(),
	wen_restart_repair_slots.clone().unwrap(),
	exit.clone(),
	&mut progress,
	)?,
	RestartState::HeaviestFork => {
	warn!("Not implemented yet, make it empty to complete test")
	}
	RestartState::FinishedSnapshot => return Err("Not implemented!".into()),
	RestartState::GeneratingSnapshot => return Err("Not implemented!".into()),
	RestartState::WaitingForSupermajority => return Err("Not implemented!".into()),
	RestartState::Done => return Ok(()),
	}

	return Err(WenRestartError::MissingLastVotedForkSlots);
	}
	} else {
	return Err(WenRestartError::InvalidLastVoteType(last_vote));
	}

Wen restart aggregate last voted fork slots #33892

Wen restart aggregate last voted fork slots #33892

Conversation

wen-coding commented Oct 27, 2023

Problem

Summary of Changes

codecov bot commented Oct 27, 2023 • edited Loading

Codecov Report

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codecov bot commented Oct 27, 2023 •

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carllin Feb 4, 2024 •

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carllin Feb 7, 2024 •

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carllin Feb 7, 2024 •

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carllin Feb 8, 2024 •

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carllin Mar 1, 2024 •

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