zhijiangW opened a new pull request #11687: [FLINK-16536][network][checkpointing] Implement InputChannel state recovery for unaligned checkpoint URL: https://github.com/apache/flink/pull/11687 ## What is the purpose of the change During recovery process for unaligned checkpoint, the remote input channel state should also be recovered besides with existing operator states. The remote channel would request buffer and then interact with ChannelStateReader to fill in the state data. The filled buffer would be inserted into respective data queue for processing in normal way. It should guarantee that the new data from upstream partition should not overtake the input state data to avoid mis-order issue. ## Brief change log - *Delay request partition in `RemoteInputChannel` after finishing reading channel state.* - *Add related interfaces method from input channel to handler stacks to notify the read of channel state* - *Implement the main process to read channel state via interacting with `ChannelStateReader`* ## Verifying this change Add some new unit tests to verify the changes ## 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, Kubernetes/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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