GitHub user sihuazhou opened a pull request:

    https://github.com/apache/flink/pull/5886

    [FLINK-9230][test] harden WebFrontendITCase#testStopYarn()

    ## What is the purpose of the change
    
    This PR aim to harden `WebFrontendITCase#testStopYarn()`.
    
    ## Brief change log
    
      - *harden `WebFrontendITCase#testStopYarn()`*
    
    ## Verifying this change
    
    This change is a trivial rework / code cleanup without any test coverage.
    
    ## Does this pull request potentially affect one of the following parts:
    
    no
    
    ## Documentation
    
    no

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/sihuazhou/flink hardenTestStopYarn

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/flink/pull/5886.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #5886
    
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commit 516dfd9dd7ac63b858c924ae57a88dde52ad1715
Author: sihuazhou <summerleafs@...>
Date:   2018-04-21T05:34:21Z

    harden WebFrontendITCase#testStopYarn()

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