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From "Alessandro Zanfardino (JIRA)" <j...@apache.org>
Subject [jira] Created: (AMQ-1868) Producer block when queue memory limit is setted to 5Mb and no consumer is actived
Date Wed, 23 Jul 2008 15:53:01 GMT
Producer block when queue memory limit is setted to 5Mb and no consumer is actived
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                 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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