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From "ZhuGuanyin (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1099) Setup and cleanup tasks could affect job latency if they are caught running on bad nodes
Date Tue, 01 Dec 2009 05:34:20 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1099?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12784067#action_12784067
] 

ZhuGuanyin commented on MAPREDUCE-1099:
---------------------------------------

We have encountered the same problem, so We just remove the setup and cleanup task (inport
the patch https://issues.apache.org/jira/browse/MAPREDUCE-463 )

> Setup and cleanup tasks could affect job latency if they are caught running on bad nodes
> ----------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-1099
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1099
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: jobtracker
>    Affects Versions: 0.20.1
>            Reporter: Hemanth Yamijala
>
> We found cases on our clusters where a setup task got scheduled on a bad node and took
upwards of several minutes to run, adversely affecting job runtimes. Speculation did not help
here as speculation is not used for setup tasks. I suspect the same could happen for cleanup
tasks as well.

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