[jira] [Created] (FLINK-17860) Recursively remove channel state directories

[Shang Yuanchun (Jira)]

Roman Khachatryan created FLINK-17860:
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             Summary: Recursively remove channel state directories
                 Key: FLINK-17860
                 URL: https://issues.apache.org/jira/browse/FLINK-17860
             Project: Flink
          Issue Type: Improvement
          Components: Runtime / Checkpointing
    Affects Versions: 1.11.0
            Reporter: Roman Khachatryan
            Assignee: Roman Khachatryan
             Fix For: 1.11.0


With a high degree of parallelism, we end up with n*n files in each checkpoint (not mitigated by state.backend.fs.memory-threshold: 1048576 and state.backend.fs.write-buffer-size: 4194304 because each state is ten-hundreds Mb).

Writing them if fast (from many subtasks), removing them is slow (from JM).

 

Instead of going through them 1 by 1, we could remove the directory recursively.

 

The easiest way is to just not call discard for channelStateHandles and then switch flag isRecursive=true (if unalignedCheckpoints == true?).

 

This can be extended to other state handles in future as well.



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