I ran my 5.3 test with the following
<systemUsage>
<systemUsage sendFailIfNoSpace="true">
<memoryUsage>
<memoryUsage limit="100mb"/>
</memoryUsage>
<storeUsage>
<storeUsage limit="500 mb" name="foo"/>
</storeUsage>
<tempUsage>
<tempUsage limit="100mb"/>
</tempUsage>
</systemUsage>
</systemUsage>
...and had my producer fill up the store; it tried to pump 400k messages
each at 2k in size. Producer flow control was also enabled. The broker did
not hurl any OOM exceptions, "just javax.jms.ResourceAllocationException:
Usage Manager Store is Full. Stopping producer..." exceptions as expected.
The producer got kicked off its connection.
The only time I got OOMs was when I used this.
<systemUsage>
<systemUsage sendFailIfNoSpace="true">
</systemUsage>
</systemUsage>
Joe
Daniel Kluesing-2 wrote:
>
> So I'm not sure if that's what Rob is talking about being fixed in 5.4
> (And I'll try the snapshot as soon as it's ready) but if I don't have the
> sendFailIfNoSpace then my understanding is the producers send calls
> block/wait/timeout - as opposed to fail - so it's more difficult to get
> into a HA configuration. It's a minor point, not having an OOM is much
> more important, but I definitely want the send calls to fail for the
> producer if the broker ever does anything funny.
>
> Thanks for the feedback on the config, very helpful.
>
> -----Original Message-----
> From: Joe Fernandez [mailto:[email protected]]
> Sent: Thursday, January 21, 2010 1:01 PM
> To: [email protected]
> Subject: RE: OOM with high KahaDB index time
>
>
> Just for grins, I threw your cfg file into our 5.3 testbed and sure
> enough,
> we got the OOMs; I pumped 200k messages with each being 2k in size. FWIW,
> taking this out of the cfg file made things run a lot better.
>
> <systemUsage>
> <systemUsage sendFailIfNoSpace="true">
> </systemUsage>
> </systemUsage>
>
> With the above taken out of the cfg file, I was able to pump 400k messages
> into the broker, no OOMs and memory utilization looked much better. I also
> gave a fully-defined systemUsage a try and that also appeared to do the
> trick.
>
> <systemUsage>
> <systemUsage>
> <memoryUsage>
> <memoryUsage limit="100 mb"/>
> </memoryUsage>
> <storeUsage>
> <storeUsage limit="1 gb" name="foo"/>
> </storeUsage>
> <tempUsage>
> <tempUsage limit="100 mb"/>
> </tempUsage>
> </systemUsage>
> </systemUsage>
>
> So may be worth giving it a whirl if you can't scoot over to the trunk and
> ride Rob's patch.
>
> Joe
>
>
> Daniel Kluesing-2 wrote:
>>
>> I tried the suggestion of going with the default cursor, but I still get
>> OOM errors. I've included my full config file below, I think I'm running
>> fairly vanilla/default.
>>
>> After about 350k persistent messages, the logs start to look like:
>>
>> INFO | Slow KahaDB access: Journal append took: 10 ms, Index update took
>> 3118 ms
>> INFO | Slow KahaDB access: Journal append took: 0 ms, Index update took
>> 5118 ms
>> INFO | Slow KahaDB access: Journal append took: 0 ms, Index update took
>> 2736 ms
>> INFO | Slow KahaDB access: Journal append took: 0 ms, Index update took
>> 2945 ms
>> INFO | Slow KahaDB access: Journal append took: 33 ms, Index update took
>> 2654 ms
>> INFO | Slow KahaDB access: Journal append took: 82 ms, Index update took
>> 3174 ms
>> INFO | Slow KahaDB access: Journal append took: 1 ms, Index update took
>> 5891 ms
>> INFO | Slow KahaDB access: Journal append took: 0 ms, Index update took
>> 2906 ms
>> INFO | Slow KahaDB access: Journal append took: 60 ms, Index update took
>> 7619 ms
>> Exception in thread "InactivityMonitor WriteCheck"
>> java.lang.OutOfMemoryError: Java heap space
>> at java.util.jar.Attributes.read(Attributes.java:377)
>> at java.util.jar.Manifest.read(Manifest.java:182)
>> at java.util.jar.Manifest.<init>(Manifest.java:52)
>> at
>> java.util.jar.JarFile.getManifestFromReference(JarFile.java:165)
>> at java.util.jar.JarFile.getManifest(JarFile.java:146)
>> at
>> sun.misc.URLClassPath$JarLoader$2.getManifest(URLClassPath.java:693)
>> at java.net.URLClassLoader.defineClass(URLClassLoader.java:221)
>> at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
>> at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
>> at java.security.AccessController.doPrivileged(Native Method)
>> at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
>> at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
>> at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
>> at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
>> at
>> org.apache.activemq.transport.InactivityMonitor.writeCheck(InactivityMonitor.java:132)
>> at
>> org.apache.activemq.transport.InactivityMonitor$2.run(InactivityMonitor.java:106)
>> at
>> org.apache.activemq.thread.SchedulerTimerTask.run(SchedulerTimerTask.java:33)
>> at java.util.TimerThread.mainLoop(Timer.java:512)
>> at java.util.TimerThread.run(Timer.java:462)
>>
>> Config file:
>>
>> <beans
>> xmlns="http://www.springframework.org/schema/beans";
>> xmlns:amq="http://activemq.apache.org/schema/core";
>> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
>> xsi:schemaLocation="http://www.springframework.org/schema/beans
>> http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
>> http://activemq.apache.org/schema/core
>> http://activemq.apache.org/schema/core/activemq-core.xsd";>
>>
>> <bean
>> class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
>> <property name="locations">
>>
>> <value>file:${activemq.base}/conf/credentials.properties</value>
>> </property>
>> </bean>
>>
>> <broker xmlns="http://activemq.apache.org/schema/core";
>> brokerName="sub01chi" dataDirectory="${activemq.base}/data">
>>
>> <managementContext>
>> <managementContext createConnector="true"/>
>> </managementContext>
>>
>> <persistenceAdapter>
>> <kahaDB directory="${activemq.base}/data/kahadb"/>
>> </persistenceAdapter>
>>
>> <destinationPolicy>
>> <policyMap>
>> <policyEntries>
>> <policyEntry queue="P>"
>> producerFlowControl="true"
>> memoryLimit="10mb"></policyEntry>
>> </policyEntries>
>> </policyMap>
>> </destinationPolicy>
>> <systemUsage>
>> <systemUsage sendFailIfNoSpace="true">
>> </systemUsage>
>> </systemUsage>
>> <transportConnectors>
>> <transportConnector name="openwire"
>> uri="tcp://0.0.0.0:61616"/>
>> </transportConnectors>
>> </broker>
>> <import resource="jetty.xml"/>
>> </beans>
>>
>> -----Original Message-----
>> From: Rob Davies [mailto:[email protected]]
>> Sent: Monday, January 18, 2010 10:42 PM
>> To: [email protected]
>> Subject: Re: OOM with high KahaDB index time
>>
>>
>> On 18 Jan 2010, at 22:14, Daniel Kluesing wrote:
>>
>>> Hi,
>>>
>>> I'm running the 5.3 release as a standalone broker. In one case, a
>>> producer is running without a consumer, producing small, persistent
>>> messages, with the FileCursor pendingQueuePolicy (per
>>> https://issues.apache.org/activemq/browse/AMQ-2512)
>>> option and flow control memoryLimit set to 100mb for the queue in
>>> question. (Through a policy entry)
>>>
>>> As the queue grows above 300k messages, KahaDB indexing starts
>>> climbing above 1 second. At around 350k messages, the indexing is
>>> taking over 8 seconds. At this point, I start getting java out of
>>> heap space errors in essentially random parts of the code. After a
>>> while, the producers timeout with a channel inactive for too long
>>> error, and the entire broker basically wedges itself. At this point,
>>> consumers are generally unable to bind to the broker quitting with
>>> timeout errors. When they can connect, consuming a single message
>>> triggers an index re-build, which takes 2-8seconds. Turning on
>>> verbose garbage collection, the jvm is collecting like mad but
>>> reclaiming no space.
>>>
>>> If I restart the broker, it comes back up, I can consume the old
>>> messages, and can handle another 350k messages until it wedges.
>>>
>>> I can reproduce under both default gc and incremental gc.
>>>
>>> Two questions:
>>> - It seems like someone is holding onto a handle to the messages
>>> after they have been persisted to disk - is this a known issue?
>>> Should I open a JIRA for it? (Or is there another explanation?)
>>>
>>> - Is there any documentation about the internals of KahaDB - the
>>> kind of indices etc? I'd like to get a better understanding of the
>>> index performance and in general how KahaDB compares to something
>>> like BerkeleyDB.
>>>
>>> Thanks
>>>
>>>
>>>
>>
>>
>> There's is some confusion over naming of our persistence options that
>> doesn't help. There is Kaha - which uses multiple log files and a Hash
>> based index - this is currently used by the FileCursor - whilst KahaDB
>> is a newer implementation, which is more robust and typically uses a
>> BTreeIndex. There is currently a new implementation of the Filecursor
>> btw - but that's a different matter. You can't currently configure the
>> HashIndex via the FileCursor - but it looks like this is the problem
>> you are encountering - as it looks like you need to increase the max
>> hash buckets.
>>
>>
>> So I would recommend the following
>> 1. Use the default pendingQueuePolicy (which only uses a FileCursor
>> for non-persistent messages - and uses the underlying database for
>> persistent messages
>> 2. Try KahaDB - which - with the BTreeIndex - will not hit the
>> problems you are seeing with the Filecursor
>>
>> or - increase the maximum number of hash buckets for the FileCursor
>> index - by setting a Java system property - maximumCapacity to 65536
>> (the default is 16384)
>>
>> cheers,
>>
>> Rob
>>
>> http://twitter.com/rajdavies
>> I work here: http://fusesource.com
>> My Blog: http://rajdavies.blogspot.com/
>> I'm writing this: http://www.manning.com/snyder/
>>
>>
>>
>>
>>
>>
>>
>
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> Sent from the ActiveMQ - User mailing list archive at Nabble.com.
>
>
>
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