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https://issues.apache.org/jira/browse/YARN-4399?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15052026#comment-15052026
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Lin Yiqun commented on YARN-4399:
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I test the failed unit tests and these error is not related.
> FairScheduler allocated container should resetSchedulingOpportunities count
> of its priority
> -------------------------------------------------------------------------------------------
>
> Key: YARN-4399
> URL: https://issues.apache.org/jira/browse/YARN-4399
> Project: Hadoop YARN
> Issue Type: Bug
> Components: scheduler
> Affects Versions: 2.7.1
> Reporter: Lin Yiqun
> Assignee: Lin Yiqun
> Attachments: YARN-4399.001.patch, YARN-4399.002.patch,
> YARN-4399.003.patch
>
>
> There is a bug on fairScheduler allocating containers when you configurate
> the locality configs.When you attempt to assigned a container,it will invoke
> {{FSAppAttempt#addSchedulingOpportunity}} whenever it can be assigned
> successfully or not. And if you configurate the
> yarn.scheduler.fair.locality.threshold.node and
> yarn.scheduler.fair.locality.threshold.rack, the schedulingOpportunity value
> will influence the locality of containers.Because if one container is
> assigned successfully and its priority schedulingOpportunity count will be
> increased, and second container will be increased again.This will may be let
> their priority of allowedLocality degrade. And this will let this container
> dealt by rackRequest. So I think in fairScheduler allocating container, if
> the previous container was dealt, its priority of schedulerCount should be
> reset to 0, and don't let its value influence container's allocating in next
> iteration and this will increased the locality of containers.
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