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From "Varun Saxena (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-5748) Potential null pointer dereference in ShuffleHandler#Shuffle#messageReceived()
Date Wed, 01 Jul 2015 09:49:05 GMT

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

Varun Saxena updated MAPREDUCE-5748:
------------------------------------
    Resolution: Not A Problem
        Status: Resolved  (was: Patch Available)

> 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.



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