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Backward sync exception improvements #4092

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merged 5 commits into from
Jul 13, 2022

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fab-10
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@fab-10 fab-10 commented Jul 13, 2022

Signed-off-by: Fabio Di Fabio fabio.difabio@consensys.net

PR description

During the investigation of a Hive test that triggers backward sync, found some improvements that could be applied to backward sync exceptions.

  1. Remove of recoursive exceptions nesting, that produces monster exception like this one
    deeply-nested-exception.txt

  2. Avoid to return null from syncBackwardsUntil methods in case the block is already trusted

  3. Log a warning for backward sync exception that are not recoverable, likewise it is already done for recoverable exceptions

  4. Rephrase the error messages when there is a validator error found during the backward sync, with the assumption that the child block is the invalid one, and the parent is correct, this makes clearer the error message for the Hive test

Fixed Issue(s)

Documentation

  • I thought about documentation and added the doc-change-required label to this PR if
    updates are required.

Changelog

Signed-off-by: Fabio Di Fabio <fabio.difabio@consensys.net>
Signed-off-by: Fabio Di Fabio <fabio.difabio@consensys.net>
@fab-10 fab-10 marked this pull request as ready for review July 13, 2022 09:10
Signed-off-by: Fabio Di Fabio <fabio.difabio@consensys.net>
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@gezero gezero left a comment

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Looks good to me

@@ -165,7 +165,13 @@ public JsonRpcResponse syncResponse(final JsonRpcRequestContext requestContext)
new Block(newBlockHeader, new BlockBody(transactions, Collections.emptyList()));

if (mergeContext.isSyncing() || parentHeader.isEmpty()) {
mergeCoordinator.appendNewPayloadToSync(block);
mergeCoordinator
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Should this be part of this PR? Is this related to BWSync?

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The idea is to log also the not recoverable backward sync exceptions, and to do that closest possible to where the sync was invoked, and possibly do other actions in case of these exceptions.
So it related to backward sync since the exception is triggered there, but no problem for me to move it to a separate PR if you think it does not belong here.

Signed-off-by: Fabio Di Fabio <fabio.difabio@consensys.net>
@macfarla macfarla merged commit a1af83b into hyperledger:main Jul 13, 2022
codyborn pushed a commit to codyborn/besu that referenced this pull request Jul 31, 2022
* Remove backward sync exception recursive nesting

Signed-off-by: Fabio Di Fabio <fabio.difabio@consensys.net>
codyborn pushed a commit to codyborn/besu that referenced this pull request Jul 31, 2022
* Remove backward sync exception recursive nesting

Signed-off-by: Fabio Di Fabio <fabio.difabio@consensys.net>
Signed-off-by: Cody Born <codyborn@outlook.com>
@fab-10 fab-10 deleted the backwardsync-exceptions branch November 8, 2022 13:29
eum602 pushed a commit to lacchain/besu that referenced this pull request Nov 3, 2023
* Remove backward sync exception recursive nesting

Signed-off-by: Fabio Di Fabio <fabio.difabio@consensys.net>
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3 participants