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https://issues.apache.org/jira/browse/MAPREDUCE-3516?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13176525#comment-13176525
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Subroto Sanyal commented on MAPREDUCE-3516:
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@Harsh
If I am not wrong, the K/V will be *Writables* on which some methods will be
exceuted like:
* {noformat}key.getClass(){noformat}
* {noformat}public void serialize(Writable w) throws IOException {
w.write(dataOut);
}{noformat}
So I feel passing *null* to key/value will not be accepted by the framework. If
user wants then they can use *NullWritable* for any such purpose.
What do you say?
> 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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