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Posted to mapreduce-issues@hadoop.apache.org by "Tsuyoshi OZAWA (JIRA)" <ji...@apache.org> on 2012/12/10 07:35:20 UTC

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

     [ https://issues.apache.org/jira/browse/MAPREDUCE-4864?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tsuyoshi OZAWA updated MAPREDUCE-4864:
--------------------------------------

    Summary: Extending RPC over umblical protocol, "getAggregationTargets()", for node-level combiner.  (was: Extending RPC over umblical protocol "getAggregationTargets()" for node-level combiner.)
    
> 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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