azagrebin opened a new pull request #7188: [FLINK-10473][State TTL] TTL state incremental cleanup for heap backend URL: https://github.com/apache/flink/pull/7188 ## What is the purpose of the change Introduce TTL state incremental cleanup for heap backend. See docs in PR for high-level idea description. ## Brief change log - Add namespace/key iterator method to internal KV state interface. - Implement it for CopyOnWriteStateTable and NestedMapsStateTable in heap backend - Add TtlIncrementalCleanup class which is called back for each state access and optionally for each keyed context change (record processing) and performs the cleanup using state namespace/key iterator - Add config for incremental cleanup in StateTtlConfig - Construct TtlIncrementalCleanup in TtlStateFactory - Add unit test TtlStateTestBase.testIncrementalCleanup - smaller improvements in unit/e2e TTL tests ## Verifying this change Unit test TtlStateTestBase.testIncrementalCleanup. ## 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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