[jira] [Updated] (MAPREDUCE-4191) capacity scheduler: job unexpectedly exceeds queue capacity limit by one task

["Karthik Kambatla (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAPREDUCE-4191?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Karthik Kambatla updated MAPREDUCE-4191:
----------------------------------------

    Target Version/s: 2.6.0  (was: 3.0.0, 2.5.0)

> capacity scheduler: job unexpectedly exceeds queue capacity limit by one task
> -----------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-4191
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4191
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2, scheduler
>    Affects Versions: 0.23.3
>            Reporter: Thomas Graves
>            Assignee: Thomas Graves
>
> While testing the queue capacity limits, it appears that the job can exceed the
> queue capacity limit by one task while the user limit factor is 1. It's not
> clear to me why this is. 
> Here is the steps to reproduce:
> 1) set yarn.app.mapreduce.am.resource.mb to 2048 (default value)
> 2) set yarn.scheduler.capacity.root.default.user-limit-factor to 1.0 (default)
> 3) set yarn.scheduler.capacity.root.default.capacity to 90 (%)
> 4) For a cluster with capacity of 56G, 90% rounded up is 51.
> 5) submit a job with large number of tasks, each task using 1G memory. 
> 6) webui shows that the used resource is 52 G, which is 92.9% of the cluster
> capacity (instead of the expected 90%), and 103.2% of the queue capacity
> (instead of the expected 100%).



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