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https://issues.apache.org/jira/browse/FLINK-10377?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16622196#comment-16622196
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ASF GitHub Bot commented on FLINK-10377:
----------------------------------------
StefanRRichter opened a new pull request #6723: [FLINK-10377] Remove
precondition in TwoPhaseCommitSinkFunction.notif…
URL: https://github.com/apache/flink/pull/6723
…yCheckpointComplete
## What is the purpose of the change
The precondition `checkState(pendingTransactionIterator.hasNext(),
"checkpoint completed, but no transaction pending");` in
`TwoPhaseCommitSinkFunction.notifyCheckpointComplete()` seems to strict,
because checkpoints can overtake checkpoints and will fail the precondition. In
this case the commit was already performed by the first notification and
subsumes the late checkpoint. I think the check can be removed.
## Brief change log
Removed the precondition without replacements and created a test case for
ou-of-order notification.
## Verifying this change
`TwoPhaseCommitSinkFunctionTest#testSubsumedNotificationOfPreviousCheckpoint`
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (no)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (no)
- The serializers: (no)
- The runtime per-record code paths (performance sensitive): (no)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Yarn/Mesos, ZooKeeper: (yes)
- The S3 file system connector: (no)
## Documentation
- Does this pull request introduce a new feature? (no)
- If yes, how is the feature documented? (not applicable)
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> Remove precondition in TwoPhaseCommitSinkFunction.notifyCheckpointComplete
> --------------------------------------------------------------------------
>
> Key: FLINK-10377
> URL: https://issues.apache.org/jira/browse/FLINK-10377
> Project: Flink
> Issue Type: Bug
> Components: Streaming Connectors
> Affects Versions: 1.5.0, 1.6.0
> Reporter: Stefan Richter
> Assignee: Stefan Richter
> Priority: Major
> Labels: pull-request-available
>
> The precondition {{checkState(pendingTransactionIterator.hasNext(),
> "checkpoint completed, but no transaction pending");}} in
> {{TwoPhaseCommitSinkFunction.notifyCheckpointComplete()}} seems to strict,
> because checkpoints can overtake checkpoints and will fail the precondition.
> In this case the commit was already performed by the first notification and
> subsumes the late checkpoint. I think the check can be removed.
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