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From "Daniel Templeton (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-7600) Yarn NODE_LOCAL request downgraded to RACK_LOCAL didn't cancel the original NODE_LOCAL request
Date Sat, 02 Dec 2017 18:00:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-7600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16275687#comment-16275687
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Daniel Templeton commented on YARN-7600:
----------------------------------------

[~rkanter], any insights from you?

> Yarn NODE_LOCAL request downgraded to RACK_LOCAL  didn't cancel the original NODE_LOCAL
request
> -----------------------------------------------------------------------------------------------
>
>                 Key: YARN-7600
>                 URL: https://issues.apache.org/jira/browse/YARN-7600
>             Project: Hadoop YARN
>          Issue Type: Task
>    Affects Versions: 2.7.3
>            Reporter: wuchang
>
> I know, when AM making container request, if the request container is NODE_LOCAL, then
AM will also send out RACK_LOCAL and OFF_SWITCH requests. On the ResourceManager side, if
RM successfully assigned a NODE_LOCAL container, I saw that RM canceled RACK_LOCAL and OFF_SWITCH
requests because it was a duplicated request and did not need to be allocated any more. 
> However, my problem is that if  the **allowRelaxity** for RACK_LOCAL and OFF_SWITCH is
true,  NODE_LOCAL request is downgraded to RACK_LOCAL , thus NODE_LOCAL's request is allocated
with RACK_LOCAL locality, then OFF_SWITCH's duplicated request will be canceled of cource,
however I did not see RM cancel the duplicated NODE_LOCAL request, so, won't it lead to NODE_LOCAL
request still exist and then be scheduled in the next-round scheduling?



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