pnowojski opened a new pull request #10939: [FLINK-15750][network] Moving output flushing to the mailbox URL: https://github.com/apache/flink/pull/10939 Almost all interactions with the network stack are happening from the mailbox thread, except of ResultPartitionWriter#flushAll, which happens from OutputFlusher thread. This commit moves ResultPartitionWriter#flushAll to the mailbox thread (as a mailbox action), which further simplifies the threading model. ## Verifying this change This is covered by variety of existing unit, integration and end-to-end 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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