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https://issues.apache.org/jira/browse/YARN-8484?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16537803#comment-16537803
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Íñigo Goiri commented on YARN-8484:
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{quote}
At the end of one of the tests, I saw a bunch of NPE when the test kills the
Router process. With YARN-8484.v1.patch I don't see them anymore and the Router
dies gratefully.
It is just to make clean the logging for the tests' execution.
I am not sure if I can add a test for this fix.
{quote}
This means you were able to repro this and trigger the NPE.
You just need to add a check for that.
Probably you will need to simplify the test.
> Fix NPE during ServiceStop in Router classes
> --------------------------------------------
>
> Key: YARN-8484
> URL: https://issues.apache.org/jira/browse/YARN-8484
> Project: Hadoop YARN
> Issue Type: Bug
> Affects Versions: 2.9.0
> Reporter: Giovanni Matteo Fumarola
> Assignee: Giovanni Matteo Fumarola
> Priority: Minor
> Attachments: YARN-8484.v1.patch
>
>
> Fix NPE during ServiceStop in Router classes.
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