StefanRRichter opened a new pull request #8853: [FLINK-12958] Integrate AsyncWaitOperator with mailbox URL: https://github.com/apache/flink/pull/8853 ## What is the purpose of the change This PR sits on top of #8692 and integrates the ``AsyncWaitOperator`` with the mailbox model. This PR keeps backwards compatibility with the legacy sources and also honors that timers and checkpoints are not yet using the mailbox. This means, there is some followup cleanup that can be done once the mailbox effort is further progressed and I left some `TODO` comments as markers. ## Brief change log - Integrate `AsyncWaitOperator` and the companion `Emitter` with the mailbox model. ## Verifying this change This change is already covered by existing unit tests and IT cases for the `AsyncWaitOperator`. ## 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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