[jboss-user] [IronJacamar] - Re: Thread BLOCKED on registerConnection/unregisterConnection?

[Vadim Kopichenko]

Vadim Kopichenko [https://community.jboss.org/people/vkopichenko] created the discussion

"Re: Thread BLOCKED on registerConnection/unregisterConnection?"

To view the discussion, visit: https://community.jboss.org/message/724971#724971

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During performance tests on JBoss 4.2.3.GA we've also faced much BLOCKED threads on org.jboss.resource.connectionmanager.CachedConnectionManager.registerConnection(CachedConnectionManager.java:288) 
and org.jboss.resource.connectionmanager.CachedConnectionManager.unregisterConnection(CachedConnectionManager.java:318)

The connection pool was not exhausted.

Digging in sources led to this:
 http://grepcode.com/file/repository.jboss.org/nexus/content/repositories/releases/org.jboss.jbossas/jboss-as-connector/5.0.0.Beta4/org/jboss/resource/connectionmanager/CachedConnectionManager.java#286 http://grepcode.com/file/repository.jboss.org/nexus/content/repositories/releases/org.jboss.jbossas/jboss-as-connector/5.0.0.Beta4/org/jboss/resource/connectionmanager/CachedConnectionManager.java#286

286      if (debug)
287      {
288         synchronized (connectionStackTraces)
289         {
290            connectionStackTraces.put(connection, new Throwable("STACKTRACE"));
291         }
292      }

So the problem is not about slow sql but about debug synchronization.

This can be disabled in deploy/jbossjca-service.xml with <attribute name="Debug">false</attribute>.
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