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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:
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[~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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