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Posted to mapreduce-issues@hadoop.apache.org by "Tsuyoshi OZAWA (JIRA)" <ji...@apache.org> on 2012/12/10 06:23:21 UTC

[jira] [Created] (MAPREDUCE-4864) Extending RPC over umblical protocol "getAggregationTargets()" for node-level combiner.

Tsuyoshi OZAWA created MAPREDUCE-4864:
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             Summary: Extending RPC over umblical protocol "getAggregationTargets()" for node-level combiner.
                 Key: MAPREDUCE-4864
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4864
             Project: Hadoop Map/Reduce
          Issue Type: Sub-task
          Components: applicationmaster
    Affects Versions: 3.0.0
            Reporter: Tsuyoshi OZAWA
            Assignee: Tsuyoshi OZAWA


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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