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https://issues.apache.org/jira/browse/CASSANDRA-3335?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13161235#comment-13161235
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Brandon Williams commented on CASSANDRA-3335:
---------------------------------------------
Tracked down to the shutdown hook:
{noformat}
java.lang.Thread.State: TIMED_WAITING (sleeping)
at java.lang.Thread.sleep(Native Method)
at org.apache.cassandra.utils.ExpiringMap.shutdown(ExpiringMap.java:103)
at
org.apache.cassandra.net.MessagingService.shutdown(MessagingService.java:495)
at
org.apache.cassandra.service.StorageService$2.runMayThrow(StorageService.java:426)
at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:30)
at java.lang.Thread.run(Thread.java:662)
{noformat}
Appears to be the ExpiringMap added in CASSANDRA-2034.
> ThreadPoolExecutor creates threads as non-daemon and will block on shutdown
> by default
> --------------------------------------------------------------------------------------
>
> Key: CASSANDRA-3335
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3335
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Reporter: Brandon Williams
> Assignee: Jonathan Ellis
> Priority: Minor
> Fix For: 1.0.6
>
> Attachments: 3335-v2.txt, 3335.txt
>
>
> This is most obviously visible in OptionalTasks which should not block
> shutdown, but often does.
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