Szilard Nemeth commented on YARN-10330:

Hi [~pbacsko],
Can you please justify the UT failures?
I'm aware there are some flaky FS preemption tests out there, I guess 
[~mhudaky] reported a jira lately to fix those.
Anyway, it's better to link the jira(s) here.
In the meantime, I will check your patch.

> Add missing test scenarios to TestUserGroupMappingPlacementRule and 
> TestAppNameMappingPlacementRule
> ---------------------------------------------------------------------------------------------------
>                 Key: YARN-10330
>                 URL: https://issues.apache.org/jira/browse/YARN-10330
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: capacity scheduler, capacityscheduler, test
>            Reporter: Peter Bacsko
>            Assignee: Peter Bacsko
>            Priority: Major
>         Attachments: YARN-10330-001.patch, YARN-10330-002.patch, 
> YARN-10330-003.patch
> After running {{TestUserGroupMappingPlacementRule}} with EclEmma, it turned 
> out that there are at least 8-10 missing test scenarios that are not covered. 
> Since we're planning to enhance mapping rule logic with extra features, it is 
> crucial to have good coverage so that we can verify backward compatibility.

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