1u0 opened a new pull request #9426: [FLINK-12958] Integrate AsyncWaitOperator with mailbox (preserving compatibility with legacy sources) URL: https://github.com/apache/flink/pull/9426 ## What is the purpose of the change This PR integrates `AsyncWaitOperator` with task's mailbox, by coordinating `AsyncWaitOperator` with it's `Emitter` thread via mailbox (the `Emitter` now delegates the execution of the element processing to the main task thread). ## Brief change log - the `AsyncWaitOperator` may execute letters from the task's mailbox if the elements queue is full; - the `Emitter` thread is delegating elememnt processing and pop up from the `StreamElementQueue` to the main task thread (via mailbox). ## 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): (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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