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https://issues.apache.org/jira/browse/CASSANDRA-21189?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18061131#comment-18061131
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Sam Tunnicliffe commented on CASSANDRA-21189:
---------------------------------------------

I don't recall why those values specifically, but I bet it was just a fairly 
arbitrary choice intended to speed up the test runtime. I'm sure it works fine 
99.999% of the time locally but is flaky in environments with more constrained 
resources, like CI. I think it would be reasonable to just bump that timeout a 
bit and see if it improves the failure rate.

> Fix flaky DTest: InProgressSequenceCoordinationTest
> ---------------------------------------------------
>
>                 Key: CASSANDRA-21189
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-21189
>             Project: Apache Cassandra
>          Issue Type: Bug
>          Components: Test/dtest/java
>            Reporter: Sam Lightfoot
>            Assignee: Sam Lightfoot
>            Priority: Normal
>             Fix For: 5.1
>
>
> There's a race condition between cluster closing and startup between test 
> scenarios due to lack of thread lifecycle handling. The spawned thread should 
> be joined before the test finishes to prevent the 'in-use port' errors.
> Affects
>  * bootstrapProgressTest
>  * decommissionProgressTest
>  * replacementProgressTest
> Adopt the same pattern as GossipTest with try-finally thread joining.



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