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https://issues.apache.org/jira/browse/MAPREDUCE-6215?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17526257#comment-17526257
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Yang Tang commented on MAPREDUCE-6215:
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This bug has been around for 7+ years. Any plans to fix it?
> Map is not cleared in SortedMapWritable.readFields(DataInput in)
> ----------------------------------------------------------------
>
> Key: MAPREDUCE-6215
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6215
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv1, mrv2
> Affects Versions: 2.6.0
> Reporter: Ahmed Radwan
> Assignee: Ahmed Radwan
> Priority: Major
> Attachments: apache-sortedMapWritable.patch
>
>
> The readFields(DataInput in) in SortedMapWritable doesn't reset the
> internally used SortedMap. If this Writable object is reused then entries
> will get accumulated in the map with every call of readFields().
> I have seen this behavior when using SequenceFileInputFormat. See
> SequenceFileRecordReader.java and SequenceFile.Reader.
>
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