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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