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Posted to mapreduce-issues@hadoop.apache.org by "Tsuyoshi OZAWA (JIRA)" <ji...@apache.org> on 2012/12/10 07:47:27 UTC

[jira] [Created] (MAPREDUCE-4865) Launching node-level combiner the end stage of MapTask

Tsuyoshi OZAWA created MAPREDUCE-4865:
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             Summary: Launching node-level combiner 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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