StefanRRichter opened a new pull request #8431: [FLINK-12480] Introduce mailbox to StreamTask main-loop URL: https://github.com/apache/flink/pull/8431 ## What is the purpose of the change This PR sits on top of #8409 and introduces the mailbox approach to the `StreamTask`. It is the next sub-task in our effort to change the threading model of `StreamTask` ## Brief change log - New class `MailboxImpl` with interfaces. - Rewritten `StreamTask#run` that spins around default action and mailbox. ## Verifying this change Added unit tests for the mailbox, everything else is 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) - 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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