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From "Karthik Kambatla (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-5748) Potential null pointer deference in ShuffleHandler#Shuffle#messageReceived()
Date Fri, 08 May 2015 23:51:00 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-5748?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Karthik Kambatla updated MAPREDUCE-5748:
----------------------------------------
    Labels:   (was: BB2015-05-RFC)

> 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
>    Affects Versions: 2.7.0
>            Reporter: Ted Yu
>            Assignee: Varun Saxena
>            Priority: Minor
>         Attachments: 0001-MAPREDUCE-5748-Potential-null-pointer-deference-in-S.patch,
MAPREDUCE-5748.02.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.



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