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From "Erick Erickson (JIRA)" <>
Subject [jira] [Updated] (SOLR-4557) Fix broken CoreContainerTest.testReload
Date Mon, 11 Mar 2013 17:01:14 GMT


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:
>             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(
> [junit4:junit4]   2> 	at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.exclusiveUnregisterMBean(
> [junit4:junit4]   2> 	at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.unregisterMBean(
> [junit4:junit4]   2> 	at com.sun.jmx.mbeanserver.JmxMBeanServer.unregisterMBean(
> [junit4:junit4]   2> 	at org.apache.solr.core.JmxMonitoredMap.put(
> [junit4:junit4]   2> 	at org.apache.solr.core.JmxMonitoredMap.put(
> [junit4:junit4]   2> 	at org.apache.solr.core.RequestHandlers.register(
> [junit4:junit4]   2> 	at org.apache.solr.core.RequestHandlers.initHandlersFromConfig(
> [junit4:junit4]   2> 	at org.apache.solr.core.SolrCore.<init>(
> [junit4:junit4]   2> 	at org.apache.solr.core.SolrCore.reload(
> [junit4:junit4]   2> 	at org.apache.solr.core.CoreContainer.reload(
> [junit4:junit4]   2> 	at org.apache.solr.core.TestCoreContainer$

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