Maybe some code of MapTask is wrong.
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                 Key: MAPREDUCE-1555
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1555
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: task
            Reporter: Ruyue Ma


{code:title=MapTask.java|borderStyle=solid}

  public void write(DataOutput out) throws IOException {
    super.write(out);
    if (isMapOrReduce()) {
      splitMetaInfo.write(out);
      splitMetaInfo = null;  // HERE:  why set null ??????
    }
  }

{code} 

In above code, if the splitMetaInfo is set null, Second Serialization (will 
invoke write) will throw NullPointerException. 

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