XComp opened a new pull request #13316: URL: https://github.com/apache/flink/pull/13316
## What is the purpose of the change The goal is to expose network memory usage to Flink's web UI. ## Brief change log * The `NetworkBufferPool` got extended to also expose memory information and the used memory segment count. * `NetworkBufferPool::getTotalNumberOfMemorySegments` was adapted to return `0` in case the BufferPool was destroyed. * The `NettyShuffleMetricFactory` was extended to expose the newly introduced properties. * The `TaskManagerDetailsHandler` is forwarding the new metrics to the REST API endpoint. ## Verifying this change This change added tests and can be verified as follows: * `NetworkBufferPoolTest` was extended ## 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? yes - If yes, how is the feature documented? docs ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org