Xiaogang Shi created FLINK-6027:
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Summary: Ignore the exception thrown by the subsuming of old completed checkpoints
Key: FLINK-6027
URL:
https://issues.apache.org/jira/browse/FLINK-6027 Project: Flink
Issue Type: Bug
Components: State Backends, Checkpointing
Reporter: Xiaogang Shi
Assignee: Xiaogang Shi
When a checkpoint is added into the {{CompletedCheckpointStore}} via the method {{addCheckpoint()}}, the oldest checkpoints will be removed from the store if the number of stored checkpoints exceeds the given limit. The subsuming of old checkpoints may fail and make {{addCheckpoint()}} throw exceptions which are caught by {{CheckpointCoordinator}}. Finally, the states in the new checkpoint will be deleted by {{CheckpointCoordinator}}. Because the new checkpoint is still in the store, we may recover the job from the new checkpoint. But the recovery will fail as the states of the checkpoint are all deleted.
We should ignore the exceptions thrown by the subsuming of old checkpoints because we can always recover from the new checkpoint when successfully adding it into the store. The ignorance may produce some dirty data, but it's acceptable because they can be cleaned with the cleanup hook introduced in the near future.
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