Gary Tully created AMQ-7185:
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Summary: XA durable sub prepared acks don't block redelivery
Key: AMQ-7185
URL: https://issues.apache.org/jira/browse/AMQ-7185
Project: ActiveMQ
Issue Type: Bug
Components: Broker, XA
Affects Versions: 5.15.0
Reporter: Gary Tully
Assignee: Gary Tully
Fix For: 5.16.0
If a durable sub acks a message in an XA transaction, on prepare the disk image
is updated and on recovery the messages is pending an outcome and won't be
redelivered.
however if the durable sub disconnects and reconnects without a broker restart,
it can receive the same messages again. Acked and prepared messages should be
blocked pending the xa transaction outcome.
This duplicate delivery can result in duplicate acks and early deletion of the
message due to the reference count. The end result, another sub may see the
message pending but not be able to receive it b/c it has already been removed
from the store.
symptom in other words:
durableSub1 and durableStub2 registered, send one message to the topic. The
message reference count is 2.
durabelSub1 does receive in xa transaction, prepares and dies. The ack needs
recovery and completion via the transaction manager.
durableSub1 reconnects and gets the same message again! commits success. The
message reference count is decremented to 1.
the first xa transaction gets recovered and commits, the duplicate ack gets
processed; the message reference count is 0 and the message gets deleted in
error.
durableSub2 tries to receive, message pending is 1, but it does not get any
message!
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