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From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5407) Sometimes, Reduce tasks hang, State is unassigned
Date Thu, 12 Mar 2009 18:10:50 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5407?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12681422#action_12681422
] 

Devaraj Das commented on HADOOP-5407:
-------------------------------------

This looks like HADOOP-4967 fixed in 0.19.1.

> Sometimes, Reduce tasks hang, State is unassigned
> -------------------------------------------------
>
>                 Key: HADOOP-5407
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5407
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.19.0
>            Reporter: ZhuGuanyin
>
> Hi, all
> When our cluster runs for a long time, some reduce tasks running on some tasktrackers
hang. Their states are UNASSIGNED.  Then, all reduce tasks on these tasktracker will hang.
> We kill the hang reduce task, then the reduce task attempt is re-scheduled to this tasktracker,
the attempt task continues to hang. We fail it, it goes to another tasktracker, it is executed
successfully. 
> Tasktracker which has hang reduce task will receive new reduce task, but the reduce 
task continue to hang for ever.
> When we reboot the tasktracker machine, reduce task no longer hangs.

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