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https://issues.apache.org/jira/browse/YARN-2252?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14163470#comment-14163470
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Karthik Kambatla commented on YARN-2252:
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[~ozawa] - I have also noticed the failure occasionally, poked around a little
but didn't see the root cause. We could reopen this JIRA or open another one:
the earlier patch is already committed to branch-2.6.
> Intermittent failure of TestFairScheduler.testContinuousScheduling
> ------------------------------------------------------------------
>
> Key: YARN-2252
> URL: https://issues.apache.org/jira/browse/YARN-2252
> Project: Hadoop YARN
> Issue Type: Bug
> Components: scheduler
> Affects Versions: trunk-win
> Reporter: Ratandeep Ratti
> Labels: hadoop2, scheduler, yarn
> Fix For: 2.6.0
>
> Attachments: YARN-2252-1.patch, yarn-2252-2.patch
>
>
> This test-case is failing sporadically on my machine. I think I have a
> plausible explanation for this.
> It seems that when the Scheduler is being asked for resources, the resource
> requests that are being constructed have no preference for the hosts (nodes).
> The two mock hosts constructed, both have a memory of 8192 mb.
> The containers(resources) being requested each require a memory of 1024mb,
> hence a single node can execute both the resource requests for the
> application.
> In the end of the test-case it is being asserted that the containers
> (resource requests) be executed on different nodes, but since we haven't
> specified any preferences for nodes when requesting the resources, the
> scheduler (at times) executes both the containers (requests) on the same node.
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