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  1. Hadoop Map/Reduce
  2. MAPREDUCE-4502 Node-level aggregation with combining the result of maps
  3. MAPREDUCE-4865

Launching node-level combiner at the end stage of MapTask and ignoring aggregated inputs at ReduceTask

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    Details

    • Type: Sub-task
    • Status: In Progress
    • Priority: Major
    • Resolution: Unresolved
    • Affects Version/s: 3.0.0-alpha1
    • Fix Version/s: None
    • Component/s: tasktracker
    • Labels:
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      Description

      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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            • Assignee:
              ozawa Tsuyoshi Ozawa
              Reporter:
              ozawa Tsuyoshi Ozawa
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              Dates

              • Created:
                Updated: