weixiuli commented on pull request #35492:
URL: https://github.com/apache/spark/pull/35492#issuecomment-1036975951


   The stagingDir will be called many times in commitJob, especially in 
traversing partitionPaths when the dynamicPartitionOverwrite is true.
   
https://github.com/apache/spark/blob/25a4c5fa84d64e37cf5c27c7b2f0f29867330bf2/core/src/main/scala/org/apache/spark/internal/io/HadoopMapReduceCommitProtocol.scala#L218-L236


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