zhijiangW opened a new pull request #8509: [FLINK-12458][network] Introduce PartitionConnectionException for unreachable producer URL: https://github.com/apache/flink/pull/8509 ## What is the purpose of the change * If the consumer can not establish a connection to remote task executor while requesting remote subpartition, which might indicate the remote task executor is not reachable. We could wrap this connection exception into new proposed `PartitionConnectionException` which also extends `PartitionException`, then the job master would decide whether to restart the upstream region to re-producer partition data.* ## Brief change log - *Introduce new `PartitionConnectionException` extends `PartitionException.* - *Wrap any exceptions into `PartitionConnectionException` while creating partition request client during `RemoteInputChannel#requestSubpartition`* ## Verifying this change - *Added new tests in `RemoteInputChannelTest` for verifying the `PartitionConnectionException` while requesting sub partition.* ## 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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