buptljy opened a new pull request #7013: [FLINK-5601][Checkpointing] Watermark checkpointing URL: https://github.com/apache/flink/pull/7013 ## What is the purpose of the change This pull request uses ListState in TimestampsAndPeriodicWatermarksOperator.java and TimestampsAndPunctuatedWatermarksOperator.java to checkpoint watermark. During recovering process, it uses union state to find the lowest watermark and emit it immediately. ## Brief change log * Add ListState to store watermark in TimestampsAndPeriodicWatermarksOperator.java and TimestampsAndPunctuatedWatermarksOperator.java. ## Verifying this change * Unit testing in WatermarkCheckpointingITCase.java. * TimestampsAndPeriodicWatermarksOperator testing: Send five "Five", then checkpoint, then make the job fail, then recover the job, and send five "Three", the sum should be 25. * TimestampsAndPunctuatedWatermarksOperator testing: Similar testing logic machenism as above. ## 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 / docs / JavaDocs / not documented)
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