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https://issues.apache.org/jira/browse/BOOKKEEPER-533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13546145#comment-13546145
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Sijie Guo commented on BOOKKEEPER-533:
--------------------------------------

suspending delivery manager is to simulate the case that closesub finished 
later than subscriber, which is the problem before fixing BOOKKEEPER-507.

another question, if Thread.suspend is not suggested to be used, could this 
issue you described happened on other test cases using Thread.suspend? e.g. 
BookKeeperClusterTestCase#sleepBookie.
                
> TestSubAfterCloseSub fails strangely in tests
> ---------------------------------------------
>
>                 Key: BOOKKEEPER-533
>                 URL: https://issues.apache.org/jira/browse/BOOKKEEPER-533
>             Project: Bookkeeper
>          Issue Type: Bug
>            Reporter: Ivan Kelly
>            Assignee: Ivan Kelly
>             Fix For: 4.2.0
>
>         Attachments: BOOKKEEPER-513.diff, BOOKKEEPER-513.diff, 
> BOOKKEEPER-533.diff, BOOKKEEPER-533.diff, BOOKKEEPER-533.diff, 
> BOOKKEEPER-533.diff, BOOKKEEPER-533.diff, BOOKKEEPER-533.diff, 
> BOOKKEEPER-533.diff, BOOKKEEPER-533.diff, BOOKKEEPER-533.diff, 
> hedwig-server.log, stack.txt
>
>
> Example https://builds.apache.org/job/bookkeeper-trunk-precommit-build/204/
> It looks like the maven surefire process exits, as if System.exit() is being 
> called. This should be the case since BOOKKEEPER-522, which removes all calls 
> to System.exit()

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