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Posted to jira@kafka.apache.org by GitBox <gi...@apache.org> on 2021/12/15 22:33:41 UTC
[GitHub] [kafka] yyu1993 opened a new pull request #11605: MINOR: replace lastOption call in LocalLog#flush() to prevent NoSuchElementException
yyu1993 opened a new pull request #11605:
URL: https://github.com/apache/kafka/pull/11605
This PR fixed the iterator access issue during segment flush where a NoSuchElementException may be thrown. This can particularly happen if the Iterable[LogSegment] is accessed by 2 threads in parallel. A particular case is when retention periodic work empties segments from the segments map, while concurrently the async flush operation tries to access the very last segment from the same map. Since Iterable[T].lastOption is not thread-safe, the parallel access sometimes fails with a NoSuchElementException.
### Committer Checklist (excluded from commit message)
- [ ] Verify design and implementation
- [ ] Verify test coverage and CI build status
- [ ] Verify documentation (including upgrade notes)
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[GitHub] [kafka] junrao merged pull request #11605: MINOR: replace lastOption call in LocalLog#flush() to prevent NoSuchElementException
Posted by GitBox <gi...@apache.org>.
junrao merged pull request #11605:
URL: https://github.com/apache/kafka/pull/11605
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[GitHub] [kafka] kowshik commented on pull request #11605: MINOR: replace lastOption call in LocalLog#flush() to prevent NoSuchElementException
Posted by GitBox <gi...@apache.org>.
kowshik commented on pull request #11605:
URL: https://github.com/apache/kafka/pull/11605#issuecomment-996266315
cc @junrao
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