Re: Too many open files

Thu, 06 Jan 2011 00:50:51 -0800 

You mean by default, ActiveMQ is already using KahaDB?

Using the activemq.xml that I posted earlier, the logs show this:
2011-01-06 15:47:48,873 INFO BrokerService:462 - Using Persistence Adapter: AMQPersistenceAdapter(/tmp/dev/devbroker) 2011-01-06 15:47:48,882 INFO AMQPersistenceAdapter:177 - AMQStore starting using directory: /tmp/dev/devbroker 2011-01-06 15:47:48,988 INFO KahaStore:463 - Kaha Store using data directory /tmp/dev/devbroker/kr-store/state 2011-01-06 15:47:49,037 INFO AMQPersistenceAdapter:235 - Active data files: []
This means that I'm not using KahaDB, right? Or this is already KahaDB that is configured?
I also tried modifying the activemq.xml to use kahaDB instead of AMQPersistenceAdapter. Here's the new 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">
<persistenceAdapter> 
           <kahaDB
                   directory="/tmp/dev/devbroker/kahaDB-data"
                   journalMaxFileLength="32mb" />
       </persistenceAdapter>
<transportConnectors> 
           <transportConnector name="openwire"
               uri="vm://devBroker" />
       </transportConnectors>

       <plugins>
           <statisticsBrokerPlugin />
       </plugins>

   </broker>

</beans>

Running the app with this configuration, the logs show this:
2011-01-06 16:44:22,974 INFO BrokerService:462 - Using Persistence Adapter: org.apache.activemq.store.kahadb.kahadbpersistenceadap...@36a55 


Is this the proper configuration to enable KahaDB?

-don


Juan Nin wrote:

I'm basically using the default config, with the things I don't use
disabled, and several values tweaked based on the sample config files
that come with ActiveMQ


On Wed, Jan 5, 2011 at 3:24 PM, Don Santillan <donzym...@gmail.com> wrote:

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

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