Github user HyukjinKwon commented on a diff in the pull request:
    --- Diff: 
    @@ -73,7 +73,10 @@ class HadoopMapReduceCommitProtocol(jobId: String, path: 
         val stagingDir: String = committer match {
           // For FileOutputCommitter it has its own staging path called "work 
    -      case f: FileOutputCommitter => 
    +      case f: FileOutputCommitter =>
    +        val workPath = f.getWorkPath
    +        require(workPath != null, s"Committer has no workpath $f")
    +        Option(workPath.toString).getOrElse(path)
    --- End diff --
    I wonder the answer to this question ^ actually .. Wouldn't 
`Option(...).getOrElse(path)` be unnecessary?

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