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From Christian Posta <christian.po...@gmail.com>
Subject Re: Help with a producer & consumer stall problem after reaching flow control
Date Fri, 02 Aug 2013 21:37:12 GMT
You'll have to check to see what the broker thinks is going on. So if the
broker dispatches messages up to the consumer prefetch limit, and the
consumer hasn't sent ack's back, the broker will not try to send any more
messages and your consumers will look hung.


On Thu, Aug 1, 2013 at 5:27 PM, Jmal <jm15119b@gmail.com> wrote:

> Hello, I'm hoping that someone would be able to help me understand why I am
> having an issue with my applications usage of ActiveMQ under flow control
> situations.  I'm using 2 ActiveMQ 5.4.3 brokers using Open JDK 1.6,
> configured with 5 queues each.  I have 2 applications in separate JVMs
> connecting to each broker independently (app1 connects to broker1 &
> broker2)
> and (app2 connects to broker2).  app1 pushes messages to 1 or more queues
> on
> broker2 using the broker2's nio URI.  app2 reads and processes those
> messages on broker2.  All works well, until broker's 1 & 2 memory usage
> reaches 100% (as observed by the admin UI).  Then app1's connection to
> broker2 is placed in flow control as expected.  The weird part is that app2
> is no longer able to read any messages from broker2 which is very
> unexpected.  If I understand correctly, producer flow control is only
> suppose to slow down the producers from app1's connection to broker2, and
> not app2's connection to broker2?  If this is true, is there a known bug
> with the version of ActiveMQ I'm using or have I mis-configured the broker?
> Below is the config used for both brokers, and each is running on 2
> separate
> EC2 instances with 7GB of memory.  Any help will be greatly appreciated.
>
> Thanks
> <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="localhost"
>         dataDirectory="/usr/data/activemq"
>         destroyApplicationContextOnStop="true"
>         persistent="true">
>
>         <destinationPolicy>
>             <policyMap>
>                 <policyEntries>
>                     <policyEntry topic=">" producerFlowControl="true">
>                         <pendingSubscriberPolicy>
>                         </pendingSubscriberPolicy>
>                     </policyEntry>
>                     <policyEntry queue=">" producerFlowControl="true">
>                         <pendingQueuePolicy>
>                         </pendingQueuePolicy>
>                     </policyEntry>
>                 </policyEntries>
>             </policyMap>
>         </destinationPolicy>
>
>         <managementContext>
>             <managementContext createConnector="true" rmiServerPort="61516"
> />
>         </managementContext>
>
>         <persistenceAdapter>
>             <kahaDB
>                 directory="/usr/data/activemq/kahadb"
>                 enableJournalDiskSyncs="false"
>                 indexWriteBatchSize="10000"
>                 indexCacheSize="1000"
>             />
>         </persistenceAdapter>
>
>         <systemUsage>
>             <systemUsage sendFailIfNoSpaceAfterTimeout="5000">
>                 <memoryUsage>
>                     <memoryUsage limit="4096 mb"/>
>                 </memoryUsage>
>                 <storeUsage>
>                     <storeUsage limit="10240 mb"/>
>                 </storeUsage>
>                 <tempUsage>
>                     <tempUsage limit="100 mb"/>
>                 </tempUsage>
>             </systemUsage>
>         </systemUsage>
>
>        <sslContext>
>                 <sslContext keyStore="keystore" keyStorePassword="abcd1234"
> trustStore="truststore" trustStorePassword="efgh5678"/>
>        </sslContext>
>         <transportConnectors>
>             <transportConnector name="ssl" uri="ssl://0.0.0.0:61616"/>
>             <transportConnector name="nio" uri="nio://0.0.0.0:61617"/>
>         </transportConnectors>
>
>     </broker>
>
>
>     <import resource="jetty.xml"/>
>
> </beans>
>
>
>
> --
> View this message in context:
> http://activemq.2283324.n4.nabble.com/Help-with-a-producer-consumer-stall-problem-after-reaching-flow-control-tp4670034.html
> Sent from the ActiveMQ - User mailing list archive at Nabble.com.
>



-- 
*Christian Posta*
http://www.christianposta.com/blog
twitter: @christianposta

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