A single lagging JBM topic subscriber can cause all publishes to lag -------------------------------------------------------------------- Key: JBMESSAGING-1790 URL: https://jira.jboss.org/jira/browse/JBMESSAGING-1790 Project: JBoss Messaging Issue Type: Bug Components: Messaging Core Affects Versions: 1.4.3.GA Environment: JBoss 5.1.0_GA, JDK 1.6.0_14 and JDK 1.6.0_18, multiple versions of Windows (2008, 2003, Vista) Reporter: Jason Burton We have an application that makes heavy use of JMS topics. The attached stack traces lead me to believe that we have one client that has some sort of network problem and that JBM is trying to write messages to it. Evidently this client's socket isn't working anymore. That's no problem (and maybe could be expected), but this causes every other client publish to hang. The attached stack traces are from JBoss and taken 10 seconds apart during an occurence of this. During this time, we observed that one or more calls to JBossMessageProducer.publish() took 50 seconds to complete (normally takes 2-5 milliseconds). Best I can tell, the "WorkManager(2)-3" thread is the culprit. Over the 50 seconds, it seemed to be stuck in a socketWrite() and has object <0x143a2250> locked. There are a few other publishing threads waiting on that lock. I'm pretty sure this relates to a closed bug: https://jira.jboss.org/jira/browse/JBMESSAGING-1220 This bug report states to run a client out of memory to reproduce the problem, but at the point of the attached server stack traces. there aren't any clients that are out of memory. We have been able to reproduce this by running a client out of memory, though. That bug report stated to reduce the prefetchSize to a number of messages whose size would be under the TCP window size. Best I can tell by searching, the TCP window size defaults to 16K on Windows. It is definitely possible that the messages we send are larger than 16K, so even setting the prefetchSize to 1 would be larger that the TCP window size. Let me know if you need any more information. -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: https://jira.jboss.org/jira/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira