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https://issues.apache.org/jira/browse/MAPREDUCE-4864?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tsuyoshi OZAWA updated MAPREDUCE-4864:
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Affects Version/s: trunk
> Adding new umbilical protocol RPC, "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, mrv2, tasktracker
> Affects Versions: 3.0.0, trunk
> Reporter: Tsuyoshi OZAWA
> Assignee: Tsuyoshi OZAWA
> Attachments:
> 0001-Adding-new-umbilical-protocol-RPC-getAggregationTarg-20130116.patch,
> 0001-Adding-new-umbilical-protocol-RPC-getAggregationTarg.patch
>
>
> 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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