Jon Meredith created CASSANDRA-15170:
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Summary: 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
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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