[jira] [Updated] (YARN-2252) Intermittent failure for testcase TestFairScheduler.testContinuousScheduling

["Ratandeep Ratti (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/YARN-2252?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ratandeep Ratti updated YARN-2252:
----------------------------------

    Attachment: YARN-2252-1.patch

Wei, since I already have a patch for this on my 2.3 hadoop branch (for my internal org). I'm also submitting it here. Please have a look to see if it is fine by you.

> Intermittent failure for testcase 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
>            Assignee: Wei Yan
>              Labels: hadoop2, scheduler, yarn
>         Attachments: YARN-2252-1.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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