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From "Amar Kamat (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2639) Reducers stuck in shuffle
Date Mon, 21 Jan 2008 03:52:34 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2639?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12560925#action_12560925
] 

Amar Kamat commented on HADOOP-2639:
------------------------------------

I ran sort-100 with a bunch of maps not serving output to a bunch of reducers, here 10 maps
blocking 5 reducers. The job ran to completion. I am not able to reproduce the error.  Is
there a way to reproduce the error. 

> Reducers stuck in shuffle
> -------------------------
>
>                 Key: HADOOP-2639
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2639
>             Project: Hadoop
>          Issue Type: Bug
>            Reporter: Amareshwari Sri Ramadasu
>            Assignee: Amar Kamat
>            Priority: Blocker
>             Fix For: 0.16.0
>
>
> I started sort benchmark on 500 nodes. It has 40000 maps and 900 reducers.
> There are 11 reducers stuck in shuffle with 33% progress. I could see a node down which
ran 80 maps on it. And all these reducers are trying to fetch map output from that node. 

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