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From "mikab PENG (JIRA)" <>
Subject [jira] [Commented] (AMQ-3448) Zombie ActiveMQ Connection Dispatcher threads - seems to consume all process File Descriptors (FD leak)
Date Tue, 20 Sep 2011 07:12:09 GMT


mikab PENG commented on AMQ-3448:

I found this issue too.

I use a very old version(4.1.1) of ActiveMQ server, and use a very old version of NMS client
to connect to the MQ server. I use the default configuration of the ActiveMQ Release. I found
in the default configuration , ActiveMQ create a dedicated thread to dipatch message, these
thread are the the threads you talking about. in my system, if the client connection doesn't
provide the MaxInactivityDuration parameter or the value of this parameter less than 0 , the
monitor thread will not started, so if the socket closed before we call the connection's close
method, the dispatch thread will not close.

the error is occour in the method onException of class org.apache.activemq.transport.InactivityMonitor
in 4.1.1. I have saw the newwest code, this code have been move to org.apache.activemq.transport.InactivityMonitor.AbstractInactivityMonitor,
I don't think it have been fixed.

you can disable the asynchronous dispatch in the #{ACTIVEMQ_HOME}/conf/activemq.xml, or don't
use dedicated thread to dipatch message in the cmd line, set the system property org.apache.activemq.UseDedicatedTaskRunner
to false in the #{ACTIVEMQ_HOME}/bin/activemq. 

i hope this is useful for you.

> Zombie ActiveMQ Connection Dispatcher threads - seems to consume all process File Descriptors
(FD leak)
> -------------------------------------------------------------------------------------------------------
>                 Key: AMQ-3448
>                 URL:
>             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 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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