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  1. Hadoop Map/Reduce
  2. MAPREDUCE-4502 Node-level aggregation with combining the result of maps
  3. MAPREDUCE-4864

Adding new umbilical protocol RPC, "getAggregationTargets()", for node-level combiner.

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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
    • Labels:
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      Description

      MapTasks need to know whether or not they should start node-level combiner agaist outputs of mapper on their node.

      The new umbilical RPC, getAggregationTargets(), is used to get outputs to be aggregated on the node. The definition as follows:

      AggregationTarget getAggregationTargets(TaskAttemptID aggregator) throws IOException;

      AggregationTarget is a abstraction class of array of TaskAttemptID to be aggregated.

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            • Assignee:
              ozawa Tsuyoshi Ozawa
              Reporter:
              ozawa Tsuyoshi Ozawa

              Dates

              • Created:
                Updated:

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