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From "Ashley Holman (JIRA)" <j...@apache.org>
Subject [jira] Created: (AMQ-2243) Stomp does not retransmit message if client ACKs inside disconnected transaction
Date Tue, 05 May 2009 06:35:38 GMT
Stomp does not retransmit message if client ACKs inside disconnected transaction
--------------------------------------------------------------------------------

                 Key: AMQ-2243
                 URL: https://issues.apache.org/activemq/browse/AMQ-2243
             Project: ActiveMQ
          Issue Type: Bug
          Components: Transport
    Affects Versions: 5.2.0
            Reporter: Ashley Holman


Demonstration of problem:

MyQueue contains MSG1, MSG2.

Stomp:
- CONNECT
- SUBSCRIBE MyQueue (ack = client)
- BEGIN tx1
- <reads a message coming from MyQueue> message-id: MSG1
- ACK message-id: MSG1 
- *disconnect TCP session*

Upon reconnecting and subscribing, MSG2 is received.  MSG1 still appears in the queue under
the admin web interface but does not get retransmitted (is it still being locked by the now-dead
transaction?)
If the above example finished with an ABORT tx1 before disconnecting, the problem does not
occur.

Further to this, if I restart activemq, MSG1 will now get retransmitted correctly (ie. it
is no longer locked by the transaction).

I suspect that the stomp implementation does not roll back all open transactions when the
client unexpectedly disconnects.

I have attached a telnet session demonstrating the exact problem.

I've also attached a unit test for transport/stomp/ which contains two tests:
* testDisconnectRetransmit() - tests that an unacknowledged message is re-transmitted if the
client disconnects before ACKing it - SUCCEEDS
* testTransactionDisconnectRetransmit() - same as above except the message gets ACK'd inside
an incomplete transaction before disconnecting - FAILS

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