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Posted to common-dev@hadoop.apache.org by "Devaraj Das (JIRA)" <ji...@apache.org> on 2009/01/28 17:53:59 UTC

[jira] Commented: (HADOOP-5131) ReduceCopier sleeps for a hardcoded interval of 5secs

    [ https://issues.apache.org/jira/browse/HADOOP-5131?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12668073#action_12668073 ] 

Devaraj Das commented on HADOOP-5131:
-------------------------------------

Looks good to me.

> ReduceCopier sleeps for a hardcoded interval of 5secs
> -----------------------------------------------------
>
>                 Key: HADOOP-5131
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5131
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.20.0
>            Reporter: Arun C Murthy
>            Assignee: Arun C Murthy
>         Attachments: HADOOP-5131_0_20090127.patch
>
>
> Currently the ReduceCopier.run has a hard-coded 5s sleep which hurts jobs where latency is important, we really should have a mechanism where the thread fetching task-completion events should notify the ReduceCopier.run.

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