zhuzhurk opened a new pull request #9920: [FLINK-14389][runtime] Restore task state before restarting tasks in DefaultScheduler URL: https://github.com/apache/flink/pull/9920 ## What is the purpose of the change This PR is to enabled DefaultScheduler to restore task state before restarting tasks. ## Brief change log - *Added SchedulerBase#restartState for task state restore* - *Changed DefaultScheduler to invoke SchedulerBase#restartState before restarting tasks* ## Verifying this change This change added tests and can be verified as follows: - *Added unit tests* - *KeyedStateCheckpointingITCase is able to pass with this fix when using ng scheduler* ## 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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