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From "zhaodong (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-9079) Speculative attempts should not run on the same node
Date Mon, 03 Dec 2018 02:34:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-9079?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16706607#comment-16706607
] 

zhaodong commented on YARN-9079:
--------------------------------

yeah, This issue is very important for us.

> Speculative attempts should not run on the same node
> ----------------------------------------------------
>
>                 Key: YARN-9079
>                 URL: https://issues.apache.org/jira/browse/YARN-9079
>             Project: Hadoop YARN
>          Issue Type: New Feature
>          Components: api, capacity scheduler, yarn
>    Affects Versions: 2.7.2
>            Reporter: Lee chen
>            Priority: Major
>         Attachments: image-2018-12-03-09-54-07-859.png
>
>
>           I found in all versions of yarn, Speculative Execution may set the speculative
task to the node of  original task.What i have read is only it will try to have one more task
attempt. haven't seen any place mentioning not on same node.It is unreasonable.If the node
have some problems lead to tasks execution will be very slow. and then placement the speculative
 task to same node cannot help the  problematic task.
>          In our cluster (version 2.7.2,2700 nodes),this phenomenon appear almost
everyday.
>  !image-2018-12-03-09-54-07-859.png! 



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