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https://issues.apache.org/jira/browse/MAPREDUCE-5748?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13937073#comment-13937073
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Hussein Baghdadi commented on MAPREDUCE-5748:
---------------------------------------------
Ok, sorry. My fault. You are right.
> 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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