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https://issues.apache.org/jira/browse/SOLR-4557?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Erick Erickson updated SOLR-4557:
---------------------------------
Attachment: SOLR-4557.patch
NOCOMMITs in this patch, but with this patch in place on my Mac,
TestCoreContainer.testReload hangs every time with zombie threads.
> Fix broken CoreContainerTest.testReload
> ---------------------------------------
>
> Key: SOLR-4557
> URL: https://issues.apache.org/jira/browse/SOLR-4557
> Project: Solr
> Issue Type: Test
> Affects Versions: 4.2, 5.0
> Reporter: Erick Erickson
> Assignee: Erick Erickson
> Attachments: SOLR-4557.patch
>
>
> I was chasing down a test failure, and it turns out that
> CoreContainerTest.testReload has only succeeded by chance. The test fires up
> 4 threads that go out and reload the same core all at once. This caused me to
> look at properly synchronizing reloading cores pursuant to SOLR-4196, on the
> theory that we should serialize loading, unloading and reloading cores; we
> shouldn't be doing _any_ of those operations from different threads on the
> same core at the same time. It turns out that if you fire up multiple reloads
> at once without serializing them, an error is thrown instead of proper
> reloading occurring, and that's the only reason the test doesn't hang. The
> stack trace of the exception is below for reference, but it doesn't with the
> code I'll attach to this patch:
> [junit4:junit4] 2> at
> com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getMBean(DefaultMBeanServerInterceptor.java:1095)
> [junit4:junit4] 2> at
> com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.exclusiveUnregisterMBean(DefaultMBeanServerInterceptor.java:427)
> [junit4:junit4] 2> at
> com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.unregisterMBean(DefaultMBeanServerInterceptor.java:415)
> [junit4:junit4] 2> at
> com.sun.jmx.mbeanserver.JmxMBeanServer.unregisterMBean(JmxMBeanServer.java:536)
> [junit4:junit4] 2> at
> org.apache.solr.core.JmxMonitoredMap.put(JmxMonitoredMap.java:138)
> [junit4:junit4] 2> at
> org.apache.solr.core.JmxMonitoredMap.put(JmxMonitoredMap.java:51)
> [junit4:junit4] 2> at
> org.apache.solr.core.RequestHandlers.register(RequestHandlers.java:106)
> [junit4:junit4] 2> at
> org.apache.solr.core.RequestHandlers.initHandlersFromConfig(RequestHandlers.java:157)
> [junit4:junit4] 2> at
> org.apache.solr.core.SolrCore.<init>(SolrCore.java:757)
> [junit4:junit4] 2> at
> org.apache.solr.core.SolrCore.reload(SolrCore.java:408)
> [junit4:junit4] 2> at
> org.apache.solr.core.CoreContainer.reload(CoreContainer.java:1076)
> [junit4:junit4] 2> at
> org.apache.solr.core.TestCoreContainer$1TestThread.run(TestCoreContainer.java:90)
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