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https://issues.apache.org/jira/browse/CASSANDRA-15170?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16890996#comment-16890996
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Jon Meredith commented on CASSANDRA-15170:
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Here's the latest - had all the updated branches passing on macOS and a 
container based on the CircleCI image.  I need to make one more pass over it 
and would like to move the gossip and streaming shutdown from trunk to 2.2 and 
merge forward.

2.2 | 
[Branch|https://github.com/jonmeredith/cassandra/commits/in-jvm-dtest-fixes-v3-2.2]
 | 
[CircleCI|https://circleci.com/gh/jonmeredith/cassandra/tree/in-jvm-dtest-fixes-v3-2%2E2]
 3.0 | 
[Branch|https://github.com/jonmeredith/cassandra/commits/in-jvm-dtest-fixes-v3-3.0]
 | 
[CircleCI|https://circleci.com/gh/jonmeredith/cassandra/tree/in-jvm-dtest-fixes-v3-3%2E0]
 3.11 | 
[Branch|https://github.com/jonmeredith/cassandra/commits/in-jvm-dtest-fixes-v3-3.11]
 | 
[CircleCI|https://circleci.com/gh/jonmeredith/cassandra/tree/in-jvm-dtest-fixes-v3-3%2E11]
 trunk | 
[Branch|https://github.com/jonmeredith/cassandra/commits/in-jvm-dtest-fixes-v3-trunk]
 | 
[CircleCI|https://circleci.com/gh/jonmeredith/cassandra/tree/in-jvm-dtest-fixes-v3-trunk]

> Reduce the time needed to release in-JVM dtest cluster resources after close
> ----------------------------------------------------------------------------
>
>                 Key: CASSANDRA-15170
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-15170
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Test/dtest
>            Reporter: Jon Meredith
>            Assignee: Jon Meredith
>            Priority: Normal
>
> There are a few issues that slow the in-JVM dtests from reclaiming metaspace 
> once the cluster is closed.
> IsolatedExecutor issues the shutdown on a SingleExecutorThreadPool, sometimes 
> this thread was still running 10s after the dtest cluster was closed.  
> Instead, switch to a ThreadPoolExecutor with a core pool size of 0 so that 
> the thread executing the class loader close executes sooner.
> If an OutboundTcpConnection is waiting to connect() and the endpoint is not 
> answering, it has to wait for a timeout before it exits. Instead it should 
> check the isShutdown flag and terminate early if shutdown has been requested.
> In 3.0 and above, HintsCatalog.load uses java.nio.Files.list outside of a 
> try-with-resources construct and leaks a file handle for the directory.  This 
> doesn't matter for normal usage, it leaks a file handle for each dtest 
> Instance created.
> On trunk, Netty global event executor threads are still running and delay GC 
> for the instance class loader.



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