feat: Optimistic Execution #16581

facundomedica · 2023-06-15T19:51:14Z

Description

RFC: #16499
Closes: #XXXX

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baseapp/abci.go

baseapp/optimistic_execution.go

facundomedica · 2023-06-30T10:20:05Z

I think we need to be especially careful when OE is aborted, because finalizeBlockState could be left in a bad state.

InitChain happens, finalizeBlockState is not nil
During FinalizeBlock we check if finalizeBlockState == nil, otherwise we re-use it (because we want to be able to access any state written during InitChain)
If we abort, we need to be able to reset to the state that we had right after InitChain.

Maybe to keep it simple we can execute OE only if height > initialHeight. That way we can just clear up the state 100% of the times

github-actions · 2023-07-20T12:58:35Z

baseapp/abci.go

 	// processed the first block, as we want to avoid overwriting the finalizeState
 	// after state changes during InitChain.
 	if req.Height > app.initialHeight {
+		// abort any running OE
+		if app.oeEnabled && app.oeInfo != nil && app.oeInfo.Running() {
+			app.oeInfo.Abort()
+			_, _ = app.oeInfo.WaitResult() // ignore the result


Change potentially affects state.

Call sequence:

(*github.com/cosmos/cosmos-sdk/baseapp.BaseApp).ProcessProposal (baseapp/abci.go:467)

baseapp/optimistic_execution.go

baseapp/abci.go

baseapp/optimistic_execution.go

baseapp/oe/optimistic_execution.go

facundomedica · 2023-08-27T11:54:05Z

I tried cleaning up the concurrency model with little success, now I'm passing a context to internalFinalizeBlock which makes it unaware of the whole OE thing, it uses this context just to know if it needs to return early.

Using channels is a cleaner way to do this, but the problem is that the function we are passing as our FinalizeBlockFn has access to baseapp and to its properties, so we have partial control over what's going on with the state. This ended up in getting wrong app hashes from time to time.

A great improvement would be to have FinalizeBlock to use only whatever is passed to it and with little to no access to baseapp. This way we could run the entire block completely concurrently by passing only cached copies of the contexts and values; and by the time we abort we just discard all of these.
On the other hand, this could complicated this a bunch given that we'd need to make sure no other process modifies the base contexts and values being passed. Also I don't know if it's possible at all without a major refactor on baseapp

baseapp/oe/optimistic_execution.go

+	go func() {
+		start := time.Now()
+		resp, err := oe.finalizeBlockFunc(ctx, oe.request)
+		oe.mtx.Lock()
+		executionTime := time.Since(start)
+		oe.logger.Debug("OE finished", "duration", executionTime.String(), "height", req.Height, "hash", hex.EncodeToString(req.Hash))
+		oe.response, oe.err = resp, err
+		close(oe.stopCh)
+		oe.mtx.Unlock()
+	}()


baseapp/oe/optimistic_execution.go

baseapp/abci.go

Co-authored-by: Aleksandr Bezobchuk <alexanderbez@users.noreply.github.com>

facundomedica · 2023-09-09T05:38:56Z

I've added a check so we don't start optimistic execution when ProcessProposal returns a "reject"

julienrbrt

mostly doc nits.

julienrbrt · 2023-09-15T16:26:56Z

simapp/app.go

@@ -241,7 +242,7 @@ func NewSimApp(
 		voteExtHandler := NewVoteExtensionHandler()
 		voteExtHandler.SetHandlers(bApp)
 	}
-	baseAppOptions = append(baseAppOptions, voteExtOp)
+	baseAppOptions = append(baseAppOptions, voteExtOp, baseapp.SetOptimisticExecution())


Is it purposely done so that simapp only uses optimistic execution?
Or should we add it here:

cosmos-sdk/server/util.go

Line 529 in e2637b8

baseapp.SetQueryGasLimit(cast.ToUint64(appOpts.Get(FlagQueryGasLimit))),

?

So I wouldn't like to add a flag for this, because that could give node operators the chance of not running optimistic execution if the developers chose to do so (they can still modify the code but that takes some extra effort).
Could we add a flag on simapp only? wdyt?

Yeah, a flag wouldn't make sense.
I was taking about adding it in our default baseapp options.
But I think I remember conversation about having it disabled by default first 🤔, so it makes sense to add it only in simapp.

baseapp/baseapp.go

baseapp/oe/optimistic_execution.go

julienrbrt

utACK!

tac0turtle · 2023-10-23T10:36:33Z

@Mergifyio backport release/v0.50.x

mergify · 2023-10-23T10:36:37Z

backport release/v0.50.x

✅ Backports have been created

#18205 feat: Optimistic Execution (backport #16581) has been created for branch release/v0.50.x but encountered conflicts

Co-authored-by: Aleksandr Bezobchuk <alexanderbez@users.noreply.github.com> (cherry picked from commit 8df065b) # Conflicts: # CHANGELOG.md # baseapp/abci_test.go

Co-authored-by: Facundo Medica <14063057+facundomedica@users.noreply.github.com> Co-authored-by: Facundo <facundomedica@gmail.com>

alexanderbez · 2023-11-11T22:48:29Z

Great work @facundomedica 👏

facundomedica added 2 commits June 15, 2023 21:50

feat: Optimistic Execution

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fix panic recovery

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facundomedica added 3 commits June 16, 2023 20:44

Merge branch 'main' of https://github.com/cosmos/cosmos-sdk into facu/oe

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fix test

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make comet panic instead of sdk

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facundomedica added 3 commits June 20, 2023 16:34

add abort channel

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fix abort

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clean up phase1

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facundomedica added 4 commits June 30, 2023 12:58

testing testing

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Merge branch 'main' of https://github.com/cosmos/cosmos-sdk into facu/oe

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merge main

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facundomedica and others added 4 commits July 21, 2023 14:16

fix

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Merge branch 'main' of https://github.com/cosmos/cosmos-sdk into facu/oe

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progress

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Merge branch 'main' into facu/oe

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alexanderbez approved these changes Aug 28, 2023

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facundomedica and others added 2 commits August 29, 2023 12:18

Update baseapp/abci.go

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Co-authored-by: Aleksandr Bezobchuk <alexanderbez@users.noreply.github.com>

only start optimistic execution if processProposal resp is accepted

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Merge branch 'main' into facu/oe

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facundomedica added 5 commits September 18, 2023 09:58

godoc + tests

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facundomedica added this pull request to the merge queue Sep 18, 2023

Merged via the queue into main with commit 8df065b Sep 18, 2023
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facundomedica deleted the facu/oe branch September 18, 2023 14:12

mergify bot pushed a commit that referenced this pull request Oct 23, 2023

feat: Optimistic Execution (#16581)

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Co-authored-by: Aleksandr Bezobchuk <alexanderbez@users.noreply.github.com> (cherry picked from commit 8df065b) # Conflicts: # CHANGELOG.md # baseapp/abci_test.go

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feat: Optimistic Execution (backport #16581) #18205

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feat: Optimistic Execution (backport #16581) (#18205)

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Co-authored-by: Facundo Medica <14063057+facundomedica@users.noreply.github.com> Co-authored-by: Facundo <facundomedica@gmail.com>

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byte-bandit mentioned this pull request Jan 11, 2024

Optimistic Execution VolumeFi/paloma#1162

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faddat mentioned this pull request Nov 8, 2024

faddat/many times #22476

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feat: Optimistic Execution #16581

feat: Optimistic Execution #16581

facundomedica commented Jun 15, 2023 •

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alexanderbez commented Nov 11, 2023

feat: Optimistic Execution #16581

feat: Optimistic Execution #16581

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