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Posted to mapreduce-issues@hadoop.apache.org by "Chen He (JIRA)" <ji...@apache.org> on 2014/09/03 16:55:51 UTC

[jira] [Commented] (MAPREDUCE-6066) Speculative attempts should not run on the same node as their original attempt

    [ https://issues.apache.org/jira/browse/MAPREDUCE-6066?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14119914#comment-14119914 ] 

Chen He commented on MAPREDUCE-6066:
------------------------------------

I will take a look.

> Speculative attempts should not run on the same node as their original attempt
> ------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-6066
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6066
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: applicationmaster, scheduler
>    Affects Versions: 3.0.0
>            Reporter: Todd Lipcon
>
> I'm seeing a behavior on trunk with fair scheduler enabled where a speculative reduce attempt is getting run on the same node as its original attempt. This doesn't make sense -- the main reason for speculative execution is to deal with a slow node, so scheduling a second attempt on the same node would just make the problem worse if anything.



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