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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-5748) Potential null pointer deference in ShuffleHandler#Shuffle#messageReceived()
Date Sat, 08 Feb 2014 16:21:21 GMT
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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