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From harry143 <hari...@yahoo-inc.com>
Subject Re: Backlog data causes producers to slow down.
Date Tue, 20 Dec 2011 08:45:07 GMT
I am facing the similar problem.
Whenever my consumer goes down and there is a data back log the production
rate goes down significantly.
Moreover when my consumer is up again , the production rate goes down again
and this cycle goes on.
Some Info : 
I am using Producer flow control = FALSE , AsyncSend(true) , persistence =
true and ConcurrentQueueStoreAndDispatch = true
As i read in this post about cursors so i am using the default store cursor.

Here is snippet from broker.xml
destinationPolicy>
      <policyMap>
        <policyEntries>
          <policyEntry topic=">" optimizedDispatch="true" memoryLimit="1gb"
producerFlowControl="false"  />
          <policyEntry queue=">" optimizedDispatch="true" memoryLimit="1gb"
producerFlowControl="false" />
        </policyEntries>
      </policyMap>
    </destinationPolicy>

<systemUsage>
      <systemUsage sendFailIfNoSpace="true">
        <memoryUsage>
          <memoryUsage limit="20 gb" />
        </memoryUsage>
        <storeUsage>
          <storeUsage limit="500 gb" name="foo" />
        </storeUsage>
        <tempUsage>
          <tempUsage limit="1 gb" />
        </tempUsage>
      </systemUsage>
    </systemUsage>

I am using all the optimizations(i read from
http://fusesource.com/docs/broker/5.4/tuning/index.html )
for producer , consumer and broker.
These optimizations are able to increase message production rate a bit but
the main issue is the stability of the production rate.(why it goes down 10
times and then keep on going down with every time consumers goes down or
goes up again).
I am trying to figure out the cause but unable to pinpoint the code in
activeMQ which is causing this issue.
When i saw threads state in jconsole i found out that as soon as consumer
start running , producer thread goes into wait state ( State: WAITING on
java.util.concurrent.locks.AbstractQueuedSynchronizer ).I understand the
queue these producers write to is blocking queue.But i  don't understand why
consumers  are affecting producers while flow control is off and my store
size is 500 GB and memory is 20GB .Why not producers are producing at a
constant rate until my KahaDB store is full.

I really need help in this matter and deeply appreciate any help from you
guys.




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