[GitHub] StefanRRichter opened a new pull request #6723: [FLINK-10377] Remove precondition in TwoPhaseCommitSinkFunction.notif…

[GitBox <gi...@apache.org>]

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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