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https://issues.apache.org/jira/browse/MAPREDUCE-4138?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13252308#comment-13252308
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Alejandro Abdelnur commented on MAPREDUCE-4138:
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+1. applied patch and run all hadoop-mapreduce-project testcase successfully.
[still puzzles me why counters (impl & API) are so complex]
> Reduce memory usage of counters due to non-static nested classes
> ----------------------------------------------------------------
>
> Key: MAPREDUCE-4138
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4138
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Reporter: Tom White
> Assignee: Tom White
> Attachments: MAPREDUCE-4138.patch
>
>
> FrameworkCounter is a non-static nested class of FrameworkCounterGroup which
> means it retains a reference to the outer class, which isn't really needed.
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