gaoyunhaii opened a new pull request #11421: [FLINK-15962][network] Reduce the default chunk size to 4M in netty stack URL: https://github.com/apache/flink/pull/11421 ## What is the purpose of the change Decrease the default Netty chunk size from 16MB to 4MB. Since Netty allocates memory by chunks, a smaller chunk size would decrease the amount of unused direct memory, thus decrease the total direct memory required. To allow users changes the default behaviors, we also makes the `page size` and `max order` properties of `NettyBufferPool` configurable. ## Brief change log - ce674a7530f5a1dae64aa226148a92ad58b2be76 introduce the configuration options and change the default chunk size to 4MB. ## Verifying this change This change added tests and can be verified as follows: - Unit tests for the configuration checking logic. - Decrease the required direct memory in E2E test `NettyShuffleMemoryControlTest` from 20M to 7M and verifies the test are still past: [Running Result](https://travis-ci.org/github/gaoyunhaii/flink/builds/663139174). ## 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): **no** - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/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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