rkhachatryan opened a new pull request #10542: [FLINK-12484][runtime] move checkpoint lock to source task URL: https://github.com/apache/flink/pull/10542 ## What is the purpose of the change **This PR is WIP** This PR removes usages of the `StreamTask#getCheckpointLock()` method and moves the field to `SourceStreamTask`. Checkpoint lock acquisition in "network" tasks (not source/sink) is unnecessary after moving them to the mailbox execution model. This PR depends on the removal of the checkpoint lock usage from `ContinuousFileReaderOperator` (#10435). ## Brief change log - *remove usages of the `StreamTask#getCheckpointLock()` method * - *use `IMMEDIATE` (no-op) `StreamTaskActionExecutor` (decorator) in `StreamTask` by default* - *move the actual checkpoint lock object (field) to `SourceStreamTask` and use `SynchronizedStreamTaskActionExecutor` in it* - *remove testing of checkpoint lock acquisition* - *update other tests ## Verifying this change This change is already covered by existing tests. ## 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): yes (removes lock acquisition for mails in network tasks which may be per record) - 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? no - If yes, how is the feature documented? not applicable
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