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From "Tsuyoshi OZAWA (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-4864) Adding new umbilical protocol RPC, "getAggregationTargets()", for node-level combiner.
Date Mon, 10 Dec 2012 06:41:21 GMT

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

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

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