Jon Meredith edited comment on CASSANDRA-15170 at 8/16/19 3:23 AM:

Apologies, messed up the 3.11 [CircleCI 

was (Author: jmeredithco):
Alright, squashed it all down to a commit against 2.2 and merge commits up 
through against the current origin.  There's a CircleCI commit tacked on the 
end of each which needs to be dropped before merge.

 2.2 | 
[Branch|https://github.com/jonmeredith/cassandra/commits/CASSANDRA-15170-2.2] | 
 3.0 | 
[Branch|https://github.com/jonmeredith/cassandra/commits/CASSANDRA-15170-3.0] | 
 3.11 | 
 trunk | 
| [CircleCI 
J8|https://circleci.com/workflow-run/eb1ad032-7b76-4aa2-a975-4ba6496bb74f] | 

Thanks for all the effort reviewing/rereviewing.

> 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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