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From lucious <marcin.gi...@arise.pl>
Subject ActiveMQ - TempTopic/TempQueue makes MQ frozen during high traffic flow
Date Wed, 10 Feb 2010 17:14:30 GMT

Hello,

Here is ActiveMQ 5.3.0 with clients connected using openwire and CMS
activemqcp-3.0.1. Server is Intel Platform with 8GB RAM :
1) policyEntry for topic=">" and queue=">" set up to memoryLimit=20mb and
producerFlowControl="false"
2) memoryUsage limit="256 mb", storageUsage = 10gb, tempUsage = 10gb
3) transport openwire with ?wireFormat.maxInactivityDuration=0

and we use quite a lot TempTopic's and TempQueues ... what I found after
really heavy traffic that :

1) Heap memory usage in JMX console went above 256MB and ActiveMQ was frozen
-> 
2) in the console such messages appeared:

 INFO | Started SelectChannelConnector@0.0.0.0:8161                                      
                                                                                 
 INFO | Slow KahaDB access: Journal append took: 511 ms, Index update took 0
ms                                                                                       
    
 INFO | Slow KahaDB access: Journal append took: 542 ms, Index update took 0
ms                                                                                       
    
 INFO | Usage Manager memory limit reached on
temp-queue://42455840-0bb5-0101-49b1-304ecf24dbbd:2. Producers will be
throttled to the rate at which messages are removed from this destination to
prevent flooding it. See
http://activemq.apache.org/producer-flow-control.html for more info                      
                                 
 INFO | Usage Manager memory limit reached on
temp-queue://924b8029-97ad-f8e2-32ff-52384d24558e:0. Producers will be
throttled to the rate at which messages are removed from this destination to
prevent flooding it. See
http://activemq.apache.org/producer-flow-control.html for more info                      
                                 
 

I also confirmed in JMX console that for Topic and Queue producerFlowControl
is disabled but for TempTopic and TempQueue is enabled.

My question is:
1) is it possible to disable producerFlowControl for TempTopics and
TempQueues?
2) maybe clients apps using CMS (cpp-3.0.1) do not do kind of
"confirmations" to Broker?
3) what can be done to improve this set up: of course memoryUsage can be
changed I mean set bigger but I'm really worried about this memory being
consumed and not released. 

Any comments on that? ;)

Many thanks,
Marcin
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