Myasuka commented on code in PR #21822:
URL: https://github.com/apache/flink/pull/21822#discussion_r1170863630


##########
flink-dstl/flink-dstl-dfs/src/main/java/org/apache/flink/changelog/fs/DuplicatingStateChangeFsUploader.java:
##########
@@ -51,14 +52,15 @@
  *       <li>Store the meta of files into {@link ChangelogTaskLocalStateStore} 
by
  *           AsyncCheckpointRunnable#reportCompletedSnapshotStates().
  *       <li>Pass control of the file to {@link 
LocalChangelogRegistry#register} when
- *           ChangelogKeyedStateBackend#notifyCheckpointComplete() , files of 
the previous
- *           checkpoint will be deleted by {@link 
LocalChangelogRegistry#discardUpToCheckpoint} at
- *           the same time.
+ *           FsStateChangelogWriter#persist , files of the previous checkpoint 
will be deleted by
+ *           {@link LocalChangelogRegistry#discardUpToCheckpoint} when the 
previous checkpoint is
+ *           confirmed.

Review Comment:
   @zoltar9264 My concern is that we already know that this solution is not a 
good choice, we might need to refactor this in the near feature. Why we have to 
do the work twice?
   
   On the other hand, since local disk has a much smaller space than DFS. 
Leaving files on the disk could make no space left problem more easily, which 
actually make the status worse.
   



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