Wangda Tan commented on YARN-3848:

Hi [~varun_saxena],

Thanks for working on this patch.

Trying to understand the problem, do you know why the dispatcher cannot be 
drained?  It seems a bigger issue if the dispatcher cannot be drained, do you 
know what's the reason of it? Is it possible to attach some jstack trace if you 
can reproduce it? I tried to run locally many (10+) times, but I cannot 

Adding timeout to the tests makes sense to me.

> TestNodeLabelContainerAllocation is timing out
> ----------------------------------------------
>                 Key: YARN-3848
>                 URL: https://issues.apache.org/jira/browse/YARN-3848
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: test
>            Reporter: Jason Lowe
>            Assignee: Varun Saxena
>         Attachments: YARN-3848.01.patch, test_output.txt
> A number of builds, pre-commit and otherwise, have been failing recently 
> because TestNodeLabelContainerAllocation has timed out.  See 
> https://builds.apache.org/job/Hadoop-Yarn-trunk/969/, YARN-3830, YARN-3802, 
> or YARN-3826 for examples.

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