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https://issues.apache.org/jira/browse/MAPREDUCE-3516?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13176154#comment-13176154
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Subroto Sanyal commented on MAPREDUCE-3516:
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Hi Harsh,
I agree, passing null can be user's mistake/error but, I feel framework should 
be capable of handling it rather than just exposing bare NPE.
                
> Possible NPE in org.apache.hadoop.mapred.MapTask.MapOutputBuffer.collect(K 
> key, V value, int partition)
> -------------------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-3516
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3516
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 0.20.1, 0.20.2, 0.20.203.0, 0.20.205.0, 0.23.0
>            Reporter: Subroto Sanyal
>            Assignee: Subroto Sanyal
>
> *org.apache.hadoop.mapred.MapTask.MapOutputBuffer.collect* accepts a pair of 
> Key and Value. There is chance that if somehow if a Null value or Key is 
> passed to the method, we can end up having NPE.

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