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Posted to common-dev@hadoop.apache.org by "Jothi Padmanabhan (JIRA)" <ji...@apache.org> on 2008/11/21 07:52:46 UTC

[jira] Assigned: (HADOOP-4683) Move the call to getMapCompletionEvents in ReduceTask.ReduceCopier.fetchOutputs to a separate thread

     [ https://issues.apache.org/jira/browse/HADOOP-4683?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jothi Padmanabhan reassigned HADOOP-4683:
-----------------------------------------

    Assignee: Jothi Padmanabhan

> Move the call to getMapCompletionEvents in ReduceTask.ReduceCopier.fetchOutputs to a separate thread
> ----------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-4683
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4683
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>            Reporter: Devaraj Das
>            Assignee: Jothi Padmanabhan
>             Fix For: 0.20.0
>
>
> The method ReduceTask.ReduceCopier.fetchOutputs makes a call to getMapCompletionEvents every iteration of the loop. This should be moved out to a separate thread. This might slow down the shuffle scheduler in some cases since there is a sleep inside the getMapCompletionEvents method.

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