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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