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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