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From magellings <>
Subject duplicates on master/slave broker failover
Date Fri, 25 Sep 2009 19:26:28 GMT

Hello.  We are running JDBC Master/Slave with ActiveMQ 5.2 and upon failing a
master broker to slave broker we are seeing duplicate messages come through
to the consumers processing a queue.  These messages are not flagged as

It's my understanding that the consumer is suppose to go through an audit
routine to avoid duplicate deliveries but with multiple consumers on the
same queue this does not seem to be the case.  It seems as if the new master
broker has no history of what the previous master broker send to consumers. 
So it could send a duplicate to consumer B while consumer A is still
processing the same message, thus it's processed twice.

Is this expected behavior during a broker failover from master to slave or
should we not be getting duplicate messages?  If so how does one handle this
situation on the consumer end?
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