symious commented on a change in pull request #35569:
URL: https://github.com/apache/spark/pull/35569#discussion_r810980252



##########
File path: 
core/src/main/scala/org/apache/spark/internal/io/HadoopMapReduceCommitProtocol.scala
##########
@@ -305,4 +304,11 @@ class HadoopMapReduceCommitProtocol(
         logWarning(s"Exception while aborting 
${taskContext.getTaskAttemptID}", e)
     }
   }
+
+  private def cleanStagingDir(jobContext: JobContext): Unit = {
+    val fs = stagingDir.getFileSystem(jobContext.getConfiguration)
+    if (fs.exists(stagingDir)) {

Review comment:
       I think the stagingDir is not created`HadoopMapReduceCommitProtocol` or 
its subclass, it's just noting the directory and the actual `OutputCommiter` 
will do the creation.
   
   Unless we are asking `HadoopMapReduceCommitProtocol` and 
`SQLHadoopMapReduceCommitProtocol` to create the stagingDir at the following 
situation.
   ```
      * The staging directory of this write job. Spark uses it to deal with 
files with absolute output
      * path, or writing data into partitioned directory with 
dynamicPartitionOverwrite=true.
   ```




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