steveloughran commented on pull request #2168:
URL: https://github.com/apache/hadoop/pull/2168#issuecomment-732997464


   latest patch follows on from HADOOP-17318 and passes in status when opening 
.pending and .pendingset files.
   
   for the magic committer this saves 1 HEAD per file in task commit; 1 HEAD 
per task in job commit
   
   For max speedup/scale we'd need to also adopt incremental listing. Later.


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