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From mkubicina <>
Subject Pending Messages, but Browsing Queue Shows No Messages
Date Wed, 21 Dec 2011 18:26:21 GMT
Hello All,

I am looking for some help in troubleshooting an ActiveMQ installation. We
are running ActiveMQ 5.4.2 on Linux on Java using Java Hot Spot
64-bit Server VM. We're using KahaDB as our persistent store and we have
pre-fetch values set to 3000 for these consumers. We're running about 30
consumers per thread across 6 machines. So, each machine has 5 threads
consuming messages. 

We're having some pretty big issues with ActiveMQ in our environment that we
can reproduce in our QA environments, but not on command. The issues tend to
happen over time. They are happening at least once a week, sometimes up to
3-4 times a week.

The issue is the following:
- On the ActiveMQ web console, we see a given queue has pending messages. If
we browse the queue using the web console, there are no messages in the
queue. Our application is also not receiving any messages to process and if
we use a JMS Browser, no messages are visible.
- If we restart Active MQ, the messages come back. We are able to see them
in the browser, the application starts receiving messages and a JMS Browser
can see messages.

How can I begin to troubleshoot this issue? Its worth mentioning that we are
not seeing any exceptions in the ActiveMQ logs around the time the issue
starts occurring.

Thanks so much for the help!

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