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https://issues.apache.org/jira/browse/AMQ-2683?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12974660#action_12974660
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Maarten Dirkse commented on AMQ-2683:
-------------------------------------
The testcase does not work as expected (ie PFC doesn't work for topics) for
both 5.4.2 and 5.5-snapshot.
> Producer Flow Control Does Not Seem to Work with Topics
> -------------------------------------------------------
>
> Key: AMQ-2683
> URL: https://issues.apache.org/jira/browse/AMQ-2683
> Project: ActiveMQ
> Issue Type: Bug
> Components: Broker
> Affects Versions: 5.3.0, 5.3.1
> Environment: Windows 2008 Server, Sun Java 6.
> Reporter: Brad Willard
> Priority: Minor
> Fix For: 5.5.0
>
>
> I have multiple producers posting messages to queues and adding statistical
> information to a topic. I have one consumer of that topic subscribing and
> taking those messages and monitors for problems. The consumer is slower than
> publishing to the topic. I have flow control enabled and I expected that
> once the memory limit of the Consumers dispatch queue was reached it would
> throttle the publishers to the topic, but instead it seems to lock everything
> up.
> The message producers are putting messages to each queue and the topic on
> separate sessions. The broker basically stops once it posts the message that
> it's going to throttle producers. The topic messages are messages with text
> attributes, they are non persistent and posted non-transactional using the
> AUTO_ACKNOWLEDGE mode.
> All the producers and consumers use the same Connection factory with with
> these attributes set.
> ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory(brokerURI);
> factory.setProducerWindowSize(1024 * 1024);
> factory.getPrefetchPolicy().setTopicPrefetch(10);
> My activemq config is as follows:
> <broker xmlns="http://activemq.apache.org/schema/core";
> brokerName="localhost" dataDirectory="${activemq.base}/data"
> destroyApplicationContextOnStop="true">
>
> <!--
> For better performances use VM cursor and small memory
> limit.
> For more information, see:
>
> http://activemq.apache.org/message-cursors.html
>
> Also, if your producer is "hanging", it's probably due to
> producer flow control.
> For more information, see:
> http://activemq.apache.org/producer-flow-control.html
> -->
>
> <destinationPolicy>
> <policyMap>
> <policyEntries>
> <policyEntry topic=">" producerFlowControl="true"
> memoryLimit="15mb">
> <pendingSubscriberPolicy>
> <vmCursor />
> </pendingSubscriberPolicy>
> </policyEntry>
> <policyEntry queue=">" producerFlowControl="true"
> memoryLimit="15mb">
> <!-- Use VM cursor for better latency
> For more information, see:
>
> http://activemq.apache.org/message-cursors.html
>
> <pendingQueuePolicy>
> <vmQueueCursor/>
> </pendingQueuePolicy>
> -->
> </policyEntry>
> </policyEntries>
> </policyMap>
> </destinationPolicy>
>
>
> <!--
> The managementContext is used to configure how ActiveMQ is
> exposed in
> JMX. By default, ActiveMQ uses the MBean server that is started
> by
> the JVM. For more information, see:
>
> http://activemq.apache.org/jmx.html
> -->
> <managementContext>
> <managementContext createConnector="false"/>
> </managementContext>
> <!--
> Configure message persistence for the broker. The default
> persistence
> mechanism is the KahaDB store (identified by the kahaDB tag).
> For more information, see:
>
> http://activemq.apache.org/persistence.html
> -->
> <persistenceAdapter>
> <kahaDB directory="${activemq.base}/data/kahadb"
> journalMaxFileLength="5 mb"/>
> </persistenceAdapter>
>
>
> <!--
> The systemUsage controls the maximum amount of space the broker
> will
> use before slowing down producers. For more information, see:
>
> http://activemq.apache.org/producer-flow-control.html
> -->
> <systemUsage>
> <systemUsage>
> <memoryUsage>
> <memoryUsage limit="200 mb"/>
> </memoryUsage>
> <storeUsage>
> <storeUsage limit="50 gb"/>
> </storeUsage>
> <tempUsage>
> <tempUsage limit="100 mb"/>
> </tempUsage>
> </systemUsage>
> </systemUsage>
>
>
> <!--
> The transport connectors expose ActiveMQ over a given protocol to
> clients and other brokers. For more information, see:
>
> http://activemq.apache.org/configuring-transports.html
> -->
> <transportConnectors>
> <transportConnector name="openwire" uri="tcp://0.0.0.0:61616"/>
> </transportConnectors>
> </broker>
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