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https://issues.apache.org/jira/browse/YARN-9253?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16760579#comment-16760579
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Prabhu Joseph commented on YARN-9253:
-------------------------------------

[~cheersyang] TestDistributedShell all test cases uses 1 NodeManager. Faced 
MiniYARNCluster conflicts when adding the placement constraint test case with 2 
nodemanagers into TestDistributedShell. To avoid conflict, thought of having a 
separate class but then found TestDistributedShellWithNodeLabels has used two 
NodeManagers and so reused it with renaming the file into 
TestDSWithMultipleNodeManager. All DistributedShell test cases like NodeLabels, 
PlacementConstraint, AllocationTag NameSpace can be well tested with multiple 
nodemanagers can use this class TestDSWithMultipleNodeManager.



> Add UT to verify Placement Constraint in Distributed Shell
> ----------------------------------------------------------
>
>                 Key: YARN-9253
>                 URL: https://issues.apache.org/jira/browse/YARN-9253
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>    Affects Versions: 3.1.1
>            Reporter: Prabhu Joseph
>            Assignee: Prabhu Joseph
>            Priority: Major
>         Attachments: YARN-9253-001.patch, YARN-9253-002.patch, 
> YARN-9253-003.patch, YARN-9253-004.patch, YARN-9253-005.patch
>
>
> Add UT to verify Placement Constraint in Distributed Shell added as part of 
> YARN-7745



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