Re: Too many open files

[Don Santillan]

Thanks for the reply Juan!

Can you give me a sample activemq.xml that enables KahaDB with 
production level settings?

-don

Can you give me a

Juan Nin wrote:
We used to have this issue with ActiveMQ 5.2.x, so had to rise the
file descriptors.
Since we moved to ActiveMQ 5.3.x and KahaDB, we naver had that issue again.

Regards,

Juan


On Wed, Jan 5, 2011 at 12:01 PM, Don Santillan <donzym...@gmail.com> wrote:
  
Hello,

I have an embedded activemq in my webapp and it is deployed in a jetty
server. I believe that our server OS's file descriptor limit has enough
value.

After a few days, the application crashed with the following error:

2011-01-05 00:34:40.000:WARN::EXCEPTION java.io.IOException: Too many open
files                at sun.nio.ch.ServerSocketChannelImpl.accept0(Native
Method)
      at
sun.nio.ch.ServerSocketChannelImpl.accept(ServerSocketChannelImpl.java:145)
      at
org.eclipse.jetty.server.nio.SelectChannelConnector$1.acceptChannel(SelectChannelConnector.java:74)
          at
org.eclipse.jetty.io.nio.SelectorManager$SelectSet.doSelect(SelectorManager.java:650)
      at
org.eclipse.jetty.io.nio.SelectorManager.doSelect(SelectorManager.java:195)
      at
org.eclipse.jetty.server.nio.SelectChannelConnector.accept(SelectChannelConnector.java:134)
      at
org.eclipse.jetty.server.AbstractConnector$Acceptor.run(AbstractConnector.java:850)
      at
org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:436)
      at java.lang.Thread.run(Thread.java:6


Is there a possibility that I have configured my activemq or persistence
wrongly which caused this? Here's my activemq.xml:
<beans xmlns="http://www.springframework.org/schema/beans";
  xmlns:amq="http://activemq.apache.org/schema/core";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
  xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
 http://activemq.apache.org/schema/core
http://activemq.apache.org/schema/core/activemq-core.xsd";>

  <broker xmlns="http://activemq.apache.org/schema/core";
      brokerName="devbroker" persistent="true"
      destroyApplicationContextOnStop="true"
      dataDirectory="/tmp/dev">
            <transportConnectors>
          <transportConnector name="openwire"
              uri="vm://devBroker" />
      </transportConnectors>

      <plugins>
          <statisticsBrokerPlugin />
      </plugins>

  </broker>

</beans>


I googled this and saw some posts telling this maybe caused by an improper
setting on memory limit. I also saw some threads that says use kaha db for
better persistence. How am I able to address both of this? Can I configure
both using the activemq.xml alone? What are the appropriate values for an
application that processes large amount of messages.

Can anyone point me to a good activemq.xml configuration that is good for
production environment?


Thanks!
-don