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https://issues.apache.org/activemq/browse/AMQ-1868?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=44502#action_44502
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Alessandro Zanfardino commented on AMQ-1868:
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Hi Hans,
thank you for your answer.
I'm using the default message cursor type: Store based.
http://activemq.apache.org/message-cursors.html
When my Producer starts, broker works like in the picture "Dispatching Messages
for Fast Customer".
When Dispatch Queue becomes full, broker should work like in the picture
"Dispatching Messages if Dispatch Queue is Full".
It seems that
- If I use no memory limit for queue, or I use memory limit close to Total
Memory
When Dispatch Queue becomes full then messages are paged in to the
dispatch queue from a pending cursor on demand,
and producer is not blocked (limited only from disk sapce)
- If I use 5Mb memory limit for queue,
When Dispatch Queue becomes full producer is blocked, rather than to swith
to model that use Pending Cursor
So, my question is: why if I use 5Mb memory limit for queue, broker doesn't
work like when I use no limit (or use high limit)?
Alessandro
> Producer block when queue memory limit is setted to 5Mb and no consumer is
> actived
> ----------------------------------------------------------------------------------
>
> Key: AMQ-1868
> URL: https://issues.apache.org/activemq/browse/AMQ-1868
> Project: ActiveMQ
> Issue Type: Bug
> Components: Broker
> Affects Versions: 5.1.0
> Environment: Unix, jdk 1.5.0_12, AMQ 5.1.0
> Reporter: Alessandro Zanfardino
> Attachments: activemq.xml, AMQTester.zip
>
>
> Hallo
> I'm using the attached source code to test AMQ 5.1.0
> I'm using following setting:
> //SESSION
> ackMode = Session.AUTO_ACKNOWLEDGE;
> //FACTORY
> dispatchAsync = true;
> useAsyncSend = false;
> //PRODUCERS
> DelveryMode=Pesrsistent
> timeToLive = 21600000; //6h
> If I use the following configuration in activemq.xml:
> <memoryUsage limit="20 mb"/>
> <policyEntry queue=">" memoryLimit="5mb"/>
> I noted this behaviour:
> if producer starts a loop of sendMessage on a queue where no consumer is
> listen, after N messages, when the 5Mb are full, producer is blocked.
> Block ends when some consumer registers a listener on this queue and start
> to conuming messages.
>
> If I change the configuration, removing queue memory limit like below:
> <memoryUsage limit="20 mb"/>
> <policyEntry queue=">" />
> and producer starts a loop of sendMessage on a queue where no consumer
> is listen, producer is NEVER blocked.
> Memory usage percentage go up until 90% and then remains steady, but
> producer continues to send.
> I expected this same behaviour when queue memory limit was 5Mb, also.
> Further, I set values for queue memory limit higher than 5Mb and
> repeated the test :
> memoryLimit="10 mb" => producer was blocked
> memoryLimit="18 mb" (=90% of 20Mb) => producer was blocked
> memoryLimit="19 mb" ( >90% of 20Mb) => producer NEVER blocked
> I expected that producer NEVER blocked in every cases.
> Please can you help me for this issue?
> Feel free to ask me other details.
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