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https://issues.apache.org/jira/browse/YARN-7600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16286580#comment-16286580
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Robert Kanter commented on YARN-7600:
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{quote}However, my problem is that if the *allowRelaxity* for RACK_LOCAL and
OFF_SWITCH is true,{quote}
[~wuchang1989], I assume by "allowRelaxity" you mean "relaxLocality"?
I'm not sure. I haven't looked to much at that part of the code - it may also
depend on which Scheduler is used.
[~wuchang1989], are you actually seeing this behavior? Or is this speculation?
> 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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