Ron Koerner created AMQ-4924:
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Summary: Duplicate messages are left in the persistence store
Key: AMQ-4924
URL: https://issues.apache.org/jira/browse/AMQ-4924
Project: ActiveMQ
Issue Type: Bug
Components: Broker
Affects Versions: 5.9.0, 5.8.0
Reporter: Ron Koerner
We have a local and remote broker connected with a duplex bridge, which is
initiated by the remote broker.
Producers are attached to the remote broker, one consumer to the local broker.
The following scenario causes messages to be left in the local store, which are
replayed when the local broker is restarted:
# messages are forwarded from the remote broker to the local broker
# messages are dispatched to the local consumer
# the connection between the local and remote broker fails
# the local broker tries to acknowledge the message reception to the remote
broker, which fails
# the remote broker reconnects
# the messages are resent
# the local broker correctly identifies them as duplicates, but puts them into
the store nevertheless where they remain until the local broker is restarted
# other messages are produced and consumed without a problem
# the local broker is restarted
# the duplicates are now delivered to the local consumer again and of course
out of order
This behaviour can be identified by a queue size which does not seem to shrink
below a certain number, even if a consumer is connected and consuming other
messages.
When the log level is set to TRACE these messages indicate the problem:
{code}
2013-12-06 20:35:17,405 TRACE .a.a.b.r.c.AbstractStoreCursor -
org.apache.activemq.broker.region.cursors.QueueStorePrefetch@c0bc4f:testqueue,batchResetNeeded=false,storeHasMessages=true,size=0,cacheEnabled=true,maxBatchSize:1
- cursor got duplicate: ID:smcexp5-58011-1386358514283-7:1:1:1:1, 4 [ActiveMQ
VMTransport: vm://LOCAL#19-1]
2013-12-06 20:35:17,412 TRACE .a.a.b.r.c.AbstractStoreCursor -
org.apache.activemq.broker.region.cursors.QueueStorePrefetch@c0bc4f:testqueue,batchResetNeeded=false,storeHasMessages=false,size=1,cacheEnabled=false,maxBatchSize:1
- fillBatch [ActiveMQ BrokerService[LOCAL] Task-2]
{code}
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