Myasuka opened a new pull request #8693: [FLINK-8871] Support to cancel checkpoing via notification URL: https://github.com/apache/flink/pull/8693 ## What is the purpose of the change Use notification to abort checkpoint, instead of previous inflexible `CancelCheckpointMarker` mechanism. ## Brief change log - No `CancelCheckpointMarker` would be created. If running checkpoint not notified as aborted, tasks would decline that checkpoint if - Task not ready. - Receieve newer checkpoint barrier in non-blocked channel, which is the same as before. - Meet the end of partition. - If some specific checkpoint is notified as aborted. That checkpoint-to-abort would be stored in `BarrierBuffer`/`BarrierTracker` and `StreamTask`. After that during checkpoint alignment, in sync or async phase of checkpoint, the target checkpoint would be aborted. ## Verifying this change This change added tests and can be verified as follows: - Previous `BarrierBufferTest` and `BarrierTrackerTest` could verify the checkpoint abort logic. - Add tests in `OneInputStreamTaskTest` to verify the aborted checkpoint could take effect in sync phase and async phase. ## 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: **no** - The S3 file system connector: **no** ## Documentation - Does this pull request introduce a new feature? **yes** - If yes, how is the feature documented? **JavaDocs**
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