Failover reconnect with outstanding consumer transaction can result in
javax.jms.JMSException: Unmatched acknowledege: MessageAck and lost ack
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Key: AMQ-2560
URL: https://issues.apache.org/activemq/browse/AMQ-2560
Project: ActiveMQ
Issue Type: Bug
Components: Broker
Affects Versions: 5.3.0
Reporter: Gary Tully
Assignee: Gary Tully
Fix For: 5.3.1, 5.4.0
It is possible to loose an ack after failover if an outstanding consumer
transaction (and ack) is in progress during failover. If due to ordering or
timing, an unexpected message is replayed to the consumer on recovery it will
delivered (and correctly not suppressed as a duplicate). This will be acked
with the outstanding messages but the ack will result in an exception
{code}javax.jms.JMSException: Unmatched acknowledege: MessageAck...{code} as
the original message will not have been re-dispatched. Essentially the ack is
lost at this stage.
The message will stay dispatched/inflight til the consumer closes, at which
point it can again be re-dispatched to another consumer. A broker restart will
also see it re-dispatched. In the mean time, it can look orphaned for some time
or will be visible in the jdbc store. It will also be visible via the inflight
count on that consumer.
Resolution:
On a transport disconnect, a consumer should discard acked state along with
delivered messages as the messages that are redelivered are not guaranteed to
be the same. This was not being done for a transacted session. Replayed
messages are more likely to be the same if the order of connection recovery is
preserved, but this will not be sufficient. (the test case shows the problem
because recovery order is dependent on hashmap order which is random when
dealing with connection ids)
This needs to be done for both consumers that use receive() or message
listeners (that are handled through dispatch)
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