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Varun Saxena commented on MAPREDUCE-5748: ----------------------------------------- OK [~devaraj.k]..Will check this. > Potential null pointer dereference in ShuffleHandler#Shuffle#messageReceived() > ------------------------------------------------------------------------------ > > Key: MAPREDUCE-5748 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-5748 > Project: Hadoop Map/Reduce > Issue Type: Bug > Affects Versions: 2.7.0 > Reporter: Ted Yu > Assignee: Varun Saxena > Priority: Minor > Labels: BB2015-05-RFC > Attachments: > 0001-MAPREDUCE-5748-Potential-null-pointer-deference-in-S.patch, > MAPREDUCE-5748.02.patch, MAPREDUCE-5748.03.patch > > > 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. -- This message was sent by Atlassian JIRA (v6.3.4#6332)