Varun Saxena commented on YARN-4330:

TestContainerManagerSecurity is failing even without this patch.
Checkstyle related(longer than 80 lines).

For findbugs, there is YARN-4298

> MiniYARNCluster prints multiple  Failed to instantiate default resource 
> calculator warning messages
> ---------------------------------------------------------------------------------------------------
>                 Key: YARN-4330
>                 URL: https://issues.apache.org/jira/browse/YARN-4330
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: test, yarn
>    Affects Versions: 2.8.0
>         Environment: OSX, JUnit
>            Reporter: Steve Loughran
>            Assignee: Varun Saxena
>            Priority: Blocker
>         Attachments: YARN-4330.01.patch
> Whenever I try to start a MiniYARNCluster on Branch-2 (commit #0b61cca), I 
> see multiple stack traces warning me that a resource calculator plugin could 
> not be created
> {code}
> (ResourceCalculatorPlugin.java:getResourceCalculatorPlugin(184)) - 
> java.lang.UnsupportedOperationException: Could not determine OS: Failed to 
> instantiate default resource calculator.
> java.lang.UnsupportedOperationException: Could not determine OS
> {code}
> This is a minicluster. It doesn't need resource calculation. It certainly 
> doesn't need test logs being cluttered with even more stack traces which will 
> only generate false alarms about tests failing. 
> There needs to be a way to turn this off, and the minicluster should have it 
> that way by default.
> Being ruthless and marking as a blocker, because its a fairly major 
> regression for anyone testing with the minicluster.

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