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https://issues.apache.org/jira/browse/CASSANDRA-15170?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16907479#comment-16907479
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Jon Meredith commented on CASSANDRA-15170:
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I've updated each of the branch for the inconsistent use of
timeouts/ExecutorUtils you pointed out, and also fixed my own nit of units ->
unit.
The only thing I noticed while doing that was that trunk was missing a couple
of synchronized modifiers in {{SharedExecutorPool}} on {{newExecutor}} and
{{shutdownAndWait}} that had been added in the 3.x and below series. Paranoia
made me include them, but I wanted to check with you if you remembered why they
were added and if there was a reason they were not merged up to 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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