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From greenbean <Kevin.Urci...@ngc.com>
Subject Trace Level Logging For Lost Messages
Date Thu, 19 Apr 2007 15:11:00 GMT

We are using Activemq 4.1.1 with Stomp.  We can reproduce a condition where
it appears messages are lost.  However, we would like to trace the internal
flow of messages to see exactly what is happening.  With a standalone
Activemq instance running, adjusting log4j.properties to debug as suggested
online and in the properties file produces very little logging about what is
happening.  Is there a better way to get very detailed logging information?

We appear to lose messages when we have around 100 Stomp consumers
distributed to several machines consuming from a single queue using
different message selectors.  The remote consumers send a message to another
queue after processing the data in the message they consumed.  There are
multiple processes producing messages that are consumed by the remote
consumers.

Things appear to work fine until a simulated level of parallelism reaches a
certain point.  This means each producer process produces, say, 24 messages
with different header properties for consumption by remote consumers with
specific message selectors instead of 10 messages with different header
properties.  A point is reached after a couple of cycles of production and
consumption where activemq stops functioning.  Messages are no longer
delivered after this point.  Using a test driver to send a message to a
queue appears to send a message.  However, the message is not delivered, and
the queue size shown through JMX does not increase.  Once Activemq enters
this state, the only way to correct the issue is to stop activemq, and
restart it.  However, the problem appears again after a couple more cycles
of production and consumption of messages.

Any suggestions or help on tracking this issue would be great.
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