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From rideallday <>
Subject Re: OOM with high KahaDB index time
Date Wed, 20 Jan 2010 16:49:18 GMT

rajdavies wrote:
> FileCursor and Kaha (which is  
> used by the AMQStore). - can you share the configuration you are using?
> KahaDB isn't the same as Kaha 

I'm still unsure... I'm using KahaDB, not AMQStore. I was about to go back
to AMQStore as this setup just isn't working, but I really like the way that
it works with the shared disk HA configuration. It's nice and simple.

A quick explanation first:
Data flows unidirectionally on a queue, communications and control are
bi-directional on topics. The test config has 2 brokers, both in a shared
disk HA setup, as described in the book. All 4 configs are the same, except
for the obvious differences in transport and broker name.
The /amq filesystem is NFS4
For my test I'm using the consumer and producer example that ships with AMQ.
I have producer flow control enabled, but it's actually the consumers that
are stalling.

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    <!-- Allows us to use system properties as variables in this
configuration file -->
        <property name="locations">

        The <broker> element is used to configure the ActiveMQ broker. 
    <broker xmlns=""
brokerName="test.shore" dataDirectory="/amq/shore" useJmx="true">
                                <topic physicalName=">"/>
				<queue physicalName=">"/>
            The managementContext is used to configure how ActiveMQ is
exposed in 
            JMX. By default, ActiveMQ uses the MBean server that is started
            the JVM. For more information, see: 
            <managementContext createConnector="true"/>

            Configure message persistence for the broker. The default
            mechanism is the KahaDB store (identified by the kahaDB tag). 
            For more information, see: 
            <kahaDB directory="/amq/shore/kahadb"/>
			For better performances use VM cursor and small memory limit.
			For more information, see:
            Also, if your producer is "hanging", it's probably due to
producer flow control.
            For more information, see:
                <policyEntry topic=">" producerFlowControl="false"
                    <vmCursor />
                <policyEntry queue=">" producerFlowControl="false"
                  <!-- Use VM cursor for better latency
                       For more information, see:
            The systemUsage controls the maximum amount of space the broker
            use before slowing down producers. For more information, see:
                    <memoryUsage limit="20 mb"/>
                    <storeUsage limit="1 gb" name="foo"/>
                    <tempUsage limit="100 mb"/>
            The transport connectors expose ActiveMQ over a given protocol
            clients and other brokers. For more information, see: 
            <transportConnector name="openwire" uri="tcp://"/>


        Uncomment to enable Camel
        Take a look at activemq-camel.xml for more details
    <import resource="camel.xml"/>

        Enable web consoles, REST and Ajax APIs and demos
        Take a look at activemq-jetty.xml for more details 
    <import resource="jetty.xml"/>

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