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Date: Thu, 13 Oct 2011 07:45:11 +0000 (UTC)
From: "mikab PENG (Commented) (JIRA)" <jira@apache.org>
To: dev@activemq.apache.org
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Subject: [jira] [Commented] (AMQ-3448) Zombie ActiveMQ Connection Dispatcher
 threads - seems to consume all process File Descriptors (FD leak)
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    [ https://issues.apache.org/jira/browse/AMQ-3448?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13126412#comment-13126412 ] 

mikab PENG commented on AMQ-3448:
---------------------------------

sorry, the below code is test code :
public static void main(String[] argv) throws Exception {
	for (int i = 0; i < 1000; i++) {
		String url = "tcp://localhost:61616?wireFormat.maxInactivityDuration=0";
		ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory(url);
		ActiveMQConnection connection = (ActiveMQConnection) factory.createConnection();

		System.err.println(connection);
		connection.start();
	}
	System.exit(0);
}

I tried the last version(5.5.0) and didn't reproduce this error.
when I run these code on 4.1.1, each connection will create a zombie thread.


> Zombie ActiveMQ Connection Dispatcher threads - seems to consume all process File Descriptors (FD leak)
> -------------------------------------------------------------------------------------------------------
>
>                 Key: AMQ-3448
>                 URL: https://issues.apache.org/jira/browse/AMQ-3448
>             Project: ActiveMQ
>          Issue Type: Bug
>    Affects Versions: 5.3.2
>         Environment: Active MQ 5.3.2
> java version "1.6.0_23"
> Java(TM) SE Runtime Environment (build 1.6.0_23-b05)
> Java HotSpot(TM) Server VM (build 19.0-b09, mixed mode)
> LSB Version: :core-3.1-amd64:core-3.1-ia32:core-3.1-noarch:graphics-3.1-amd64:graphics-3.1-ia32:graphics-3.1-noarch
> Distributor ID: CentOS
> Description: CentOS release 5.5 (Final)
> Release: 5.5
> Codename: Final
>            Reporter: Carl Allain
>            Priority: Critical
>
> Somehow linked to https://issues.apache.org/jira/browse/AMQ-3286 which was closed. I am opening here as I cannot reopen the old bug and I hope that with the information I provide here, someone will be able to have some insight of the possible cause and a fix.
> I don't know how to reproduce with a test case, but I have found 800+ of such "ActiveMQ Connection Dispatcher" threads. I also noted that the number of FDs for the process keeps increasing and after a few days, we have a "too many files opened" when going beyond the 1024 limit. Most of those FDs (hundreds) do look like:
> java 6700 lexo-ext 904u sock 0,5 1741176200 can't identify protocol
> There is not much activity on the system and that is still enough to get the problem.
> When we reach the limit of FDs, we get tons of stack traces in the logs, filling up the hard disk...

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