Hi Recently I have been diving into fixing some leaks in ActiveMQ. It started with the activemq-pool component which caused a Camel JMS client to become slower, due memory leaks not being released.
The activemq-pool has been fixed now, and runs flawless again. On a side note Tim Bish is working on improving the activemq-pool to be a better pool by leveraging more logic from commons-pool on the connection side as well. Beforehand it was only the sessions that was leveraged. Anyway continuing with the Camel JMS client, we have reports, about leaks in Tomcat, when you redeploy an application. So I have been tracking those down, and got most of it fixed. Have some pending commits for the JMS client. However on embedded a full blow ActiveMQ broker in a web container as Tomcat, and then supporting hot deployment, surfaced some issues with some thread pools not being closed graceful. Instead the pools is closed aggresively, and as some of them have idle threads timeout of 30 seconds, then those threads dont timeout before the application is redeployed (assuming you re-deploy the app; to remedy this you would have to stop the app, and wait for > 30 sec, and then deploy again). As we have some good graceful shutdown code in Camel, I have ported part of that to AMQ, in the ThreadPoolUtils class in the util package. There is a number of shutdown methods, to use for graceful shutdown. When a graceful shutdown of a thread pool is in the works, and if it takes some times, then we now log every 5th second about the shutdown in progress. There is a number of tickets in JIRA about this recent work (all the stuff above, etc.) https://issues.apache.org/jira/browse/AMQ-4026 https://issues.apache.org/jira/browse/AMQ-4019 https://issues.apache.org/jira/browse/AMQ-3451 https://issues.apache.org/jira/browse/AMQ-4016 https://issues.apache.org/jira/browse/AMQ-3959 https://issues.apache.org/jira/browse/AMQ-3797 https://issues.apache.org/jira/browse/AMQ-4008 https://issues.apache.org/jira/browse/AMQ-4011 https://issues.apache.org/jira/browse/AMQ-3997 -- Claus Ibsen ----------------- FuseSource Email: [email protected] Web: http://fusesource.com Twitter: davsclaus, fusenews Blog: http://davsclaus.com Author of Camel in Action: http://www.manning.com/ibsen
