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Posted to mapreduce-issues@hadoop.apache.org by "Ted Yu (JIRA)" <ji...@apache.org> on 2014/02/08 17:21:21 UTC

[jira] [Created] (MAPREDUCE-5748) Potential null pointer deference in ShuffleHandler#Shuffle#messageReceived()

Ted Yu created MAPREDUCE-5748:
---------------------------------

             Summary: Potential null pointer deference in ShuffleHandler#Shuffle#messageReceived()
                 Key: MAPREDUCE-5748
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5748
             Project: Hadoop Map/Reduce
          Issue Type: Bug
            Reporter: Ted Yu
            Priority: Minor


Starting around line 510:
{code}
      ChannelFuture lastMap = null;
      for (String mapId : mapIds) {
...
      }
      lastMap.addListener(metrics);
      lastMap.addListener(ChannelFutureListener.CLOSE);
{code}
If mapIds is empty, lastMap would remain null, leading to NPE in addListener() call.



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