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From "Daniel Ellis (JIRA)" <jira+amq...@apache.org>
Subject [jira] Updated: (AMQNET-176) Messages received by a transactional session are not redelivered when the session dies before being commited.
Date Wed, 08 Jul 2009 21:30:07 GMT

     [ https://issues.apache.org/activemq/browse/AMQNET-176?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Daniel Ellis updated AMQNET-176:
--------------------------------

    Attachment: Message to JMS transactional session.pcap
                Message to NMS transactional session.pcap

Attached are two Wireshark traces.  The first is the trace of the NMS example, where I sent
a text message from the web admin console, the message was "Message 1".  The second is the
example where I sent a message to my JMS app, the message was "Message 2".

I am unable to decipher the captures because there is no Openwire dissector for Wireshark
(shame).  But looking at the TCP messages, there is clearly much more data sent back to the
broker after the message is received when using the NMS client.

JMS Client: 1 packet sent after received message (21 bytes)
NMS Client: 2 packets sent after received message (103 + 295 bytes)


> Messages received by a transactional session are not redelivered when the session dies
before being commited.
> -------------------------------------------------------------------------------------------------------------
>
>                 Key: AMQNET-176
>                 URL: https://issues.apache.org/activemq/browse/AMQNET-176
>             Project: ActiveMQ .Net
>          Issue Type: Bug
>          Components: ActiveMQ Client
>         Environment: .NET 2.0 on Windows XP
>            Reporter: Daniel Ellis
>            Assignee: Jim Gomes
>         Attachments: Message to JMS transactional session.pcap, Message to NMS transactional
session.pcap
>
>
> In our testing we have discovered that messages are not redelivered as expected when
we are using a transactional session.  The test goes as follows:-
> 1.  Create a connection and a transactional session.
> 2.  Create a queue consumer, add a listener and start the connection.
> 3.  Add a message to the queue, the message will arrive on the consumer.
> 4.  Kill the session (either dispose of the session and connection, or just kill the
process)
> 5.  Perform steps 1 & 2 again.
> Note that the message is not redelivered.
> We expect the message to be redelivered because the transaction was never committed.
 Looking at the Queues page on the web admin, you can see the queue count is still 1.  So
the message is still on the broker.
> To diagnose whether this is an NMS issue or an ActiveMQ issue, I created a Java application
to test this issue using JMS.
> The resulting behaviour is as expected when using JMS.  After the message is received,
I can either cleanly dispose the session, or kill the application, and the message will be
redelivered next time you start the app.
> I was a little confused as to why the message did not get redelivered, in the example
where I simply kill the process.  I would expect the broker to handle NMS and JMS clients
the same, as the TCP connection would simply be terminated.
> I then noticed a difference between NMS and JMS, when looking in the web admin.   When
a message arrives on a JMS client the queue count shows 1, and clicking on the queue shows
the message still on the queue.  When a message arrives on an NMS client, the queue count
goes to 1, but clicking on the queue shows no messages.
> Clearly, there is a difference between how JMS and NMS handle an incoming message on
a transactional session.  Could it be that NMS is sending an ack for each message when it
shouldn't?

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