Myasuka opened a new pull request #7009: [FLINK-10712] Support to restore state when using RestartPipelinedRegionStrategy URL: https://github.com/apache/flink/pull/7009 ## What is the purpose of the change Currently, RestartPipelinedRegionStrategy does not perform any state restore. This is big problem because all restored regions will be restarted with empty state. This PR supports to restore state when using RestartPipelinedRegionStrategy. ## Brief change log - Implement new `restoreLatestCheckpointedState` API for region-based failover in `CheckpointCoordinator`. - Reload checkpointed state when `FailoverRegion` called `restart` method. - `StateAssignmentOperation` could assign state with given executionVertices. ## Verifying this change This change added tests and can be verified as follows: - Added unit tests for `FailoverRegion` to ensure the failover region ever called new `restoreLatestCheckpointedState` API within `CheckpointCoordinator`. - Added unit tests for `CheckpointCoordinatorTest` to ensure `CheckpointCoordinator` could restore with `RestartPipelinedRegionStrategy`. - Added unit tests for `CheckpointStateRestoreTest` to ensure `RestartPipelinedRegionStrategy` could handle well when restoring state from a checkpoint to the task executions. - Added new integration test `RegionFailoverITCase` to verify state could be restored properly when the job consists multi regions. - Refactored `StreamFaultToleranceTestBase` to let all sub-classes ITs could failover with state using RestartPipelinedRegionStrategy. ## 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): don't know - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, 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? JavaDocs
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