pnowojski opened a new pull request #10218: [hotfix][network] Reduce the synchronisation overhead in CreditBasedSequenceNumberingViewReader URL: https://github.com/apache/flink/pull/10218 Previously CreditBasedSequenceNumberingViewReader#isAvailable() was synchronising twice on the lock subpartitionView if there are no credits: first in subpartitionView.isAvailable() and second in subpartitionView.nextBufferIsEvent(). The first one `subpartitionView.isAvailable()` check is redundant (always true) if `subpartitionView.nextBufferIsEvent()` is also true so it should be safe to simplify the code. ## Verifying this change This change is already covered by existing network stack tests and most of the ITCases/e2e tests. ## Does this pull request potentially affect one of the following parts: - Dependencies (does it add or upgrade a dependency): (yes / **no**) - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: (yes / **no**) - The serializers: (yes / **no** / don't know) - The runtime per-record code paths (performance sensitive): (**yes** / no / don't know) - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (yes / **no** / don't know) - The S3 file system connector: (yes / **no** / don't know) ## Documentation - Does this pull request introduce a new feature? (yes / **no**) - If yes, how is the feature documented? (**not applicable** / docs / JavaDocs / not documented)
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