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https://issues.apache.org/jira/browse/CURATOR-126?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14076204#comment-14076204
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Jordan Zimmerman commented on CURATOR-126:
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I think the above change is a good idea, but it probably won't totally solve
the problem. executorService.shutdownNow() will just interrupt the threads and,
so, the client will still get closed while a background thread is executing.
We could consider calling executorService.awaitTermination() but that would be
a significant change.
> IllegalStateException in performBackgroundOperation during close
> ----------------------------------------------------------------
>
> Key: CURATOR-126
> URL: https://issues.apache.org/jira/browse/CURATOR-126
> Project: Apache Curator
> Issue Type: Bug
> Components: Framework
> Affects Versions: 2.5.0
> Reporter: Scott Blum
> Assignee: Cameron McKenzie
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> {code}
> [CuratorFramework-0] ERROR
> org.apache.curator.framework.imps.CuratorFrameworkImpl - Background
> exception was not retry-able or retry gave up
> java.lang.IllegalStateException: Client is not started
> at
> com.google.common.base.Preconditions.checkState(Preconditions.java:176)
> at
> org.apache.curator.CuratorZookeeperClient.getZooKeeper(CuratorZookeeperClient.java:113)
> at
> org.apache.curator.framework.imps.CuratorFrameworkImpl.performBackgroundOperation(CuratorFrameworkImpl.java:807)
> at
> org.apache.curator.framework.imps.CuratorFrameworkImpl.backgroundOperationsLoop(CuratorFrameworkImpl.java:793)
> at
> org.apache.curator.framework.imps.CuratorFrameworkImpl.access$400(CuratorFrameworkImpl.java:57)
> at
> org.apache.curator.framework.imps.CuratorFrameworkImpl$4.call(CuratorFrameworkImpl.java:275)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:744)
> {code}
> I see this sometimes during test runs; I believe this happens because
> CuratorZookeeperClient.started gets set to false during shutdown, but the
> backgroundOperation loop can still be running since shutting down the
> backgroundOperation loop is inherently racy.
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