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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1984) some reducer stuck at copy phase and progress extremely slowly
Date Mon, 12 Nov 2007 16:43:51 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1984?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12541832

Arun C Murthy commented on HADOOP-1984:

Sorry, I should have been more clear: the proposal I had in mind takes into account the total
number of maps for the job and the number of complete, yet fetch-pending maps... does that

> some reducer stuck at copy phase and progress extremely slowly
> --------------------------------------------------------------
>                 Key: HADOOP-1984
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1984
>             Project: Hadoop
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.16.0
>            Reporter: Runping Qi
>            Assignee: Amar Kamat
>            Priority: Critical
>             Fix For: 0.16.0
>         Attachments: HADOOP-1984.patch
> In many cases, some reducers got stuck at copy phase, progressing extremely slowly.
> The entire cluster seems doing nothing. This causes a very bad long tails of otherwise
well tuned map/red jobs.

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