danny0405 commented on PR #19226:
URL: https://github.com/apache/hudi/pull/19226#issuecomment-4979544851

   > > @fhan688 is there any bug we want to fix in this patch?
   > 
   > Yes. The bug is that MOR compaction rollback planning can be overly 
conservative and leave compaction-produced files behind after the later delta 
commits are no longer present.
   > 
   > This patch keeps the old base-file-only behavior when later delta commits 
still exist, but allows full cleanup of the compaction instant when no later 
delta commits remain. The requested-compaction changes are to keep 
rollback/restore timeline-only for REQUESTED instants, so they do not generate 
file-level rollback work.
   
   didn't get it yet, can you revert the optimization code make make the 
smallest change for the fix.


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