Roman Khachatryan created FLINK-17860:

             Summary: Recursively remove channel state directories
                 Key: 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 

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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