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https://issues.apache.org/jira/browse/MAPREDUCE-4865?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tsuyoshi OZAWA updated MAPREDUCE-4865:
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Summary: Launching node-level combiner at the end stage of MapTask (was:
Launching node-level combiner the end stage of MapTask)
> Launching node-level combiner at the end stage of MapTask
> ---------------------------------------------------------
>
> Key: MAPREDUCE-4865
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4865
> Project: Hadoop Map/Reduce
> Issue Type: Sub-task
> Components: tasktracker
> Affects Versions: 3.0.0
> Reporter: Tsuyoshi OZAWA
> Assignee: Tsuyoshi OZAWA
>
> MapTask needs to start node-level aggregation against local outputs at the
> end stage of MapTask after calling getAggregationTargets().
> This feature is implemented with Merger and CombinerRunner.
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