[GitHub] Myasuka opened a new pull request #7813: [FLINK-10712] Support to restore state when using RestartPipelinedRegionStrategy

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Myasuka opened a new pull request #7813: [FLINK-10712] Support to restore state when using RestartPipelinedRegionStrategy
URL: https://github.com/apache/flink/pull/7813
 
 
   ## What is the purpose of the change
   
   After [FLINK-11618](https://issues.apache.org/jira/browse/FLINK-11618) merged, previous [PR-7009](https://github.com/apache/flink/pull/7009) seems a bit outdated, just create this new PR based on previous discussion to replace the older one.
   
   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
     - Reload checkpointed state when `FailoverRegion` called `restart` method.
   
   ## 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 new integration test `RegionFailoverITCase` to verify split redistribution and union 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): **no**
     - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: **yes**, restore state when failover using RestartPipelinedRegionStrategy.
     - 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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