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Date: Mon, 29 Jun 2009 17:36:08 -0700 (PDT)
From: "Eric Van Dewoestine (JIRA)" <jira@apache.org>
To: dev@activemq.apache.org
Subject: [jira] Commented: (AMQ-1807) Activemq stops dispatching messages
 aborting transaction (STOMP)
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    [ https://issues.apache.org/activemq/browse/AMQ-1807?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=52561#action_52561 ] 

Eric Van Dewoestine commented on AMQ-1807:
------------------------------------------

I just wanted to offer a bit of feedback on the current state of this as of the 20090620 snapshot (which includes Dejan's 738904 revision).  For message redelivery, when aborting the transaction, the redelivery policy is not currently honored.  This results in an infinite number of immediate retries to deliver the unacknowledged messages.

> Activemq stops dispatching messages aborting transaction (STOMP)
> ----------------------------------------------------------------
>
>                 Key: AMQ-1807
>                 URL: https://issues.apache.org/activemq/browse/AMQ-1807
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Transport
>    Affects Versions: 5.1.0
>         Environment: Linux, JDK 1.6_06b2
>            Reporter: Celso Pinto
>            Assignee: Dejan Bosanac
>            Priority: Critical
>             Fix For: 5.4.0
>
>         Attachments: stomp_test.patch
>
>
> As requested by Dejan Bosanac, I'm adding this ticket. I'm willing to help fix it, ie. I can get my hands dirty, but I must have some pointers on where to look because (unfortunately) I don't have much time to learn ActiveMQ's internals and architecture.
> A copy of the email I sent to the users mailing-list:
> =============================================
> I'm currently struggling to understand the reason behind that's causing the behaviour described in the subject: I'm connecting to activemq via stomp on a python app. Because I need to have the messages rolled back in case of some processing failure I'm wrapping the message processing in the following way:
>  message received -> start transaction -> ack message in transaction ->
> process message -> if no exception commit tx, else rollback transaction
> AFAIK, this is the only way of making message unacknowledgement possible with stomp. Also, this is a single client connection, ie. I'm using a
> single client connection to create a message processing daemon, all messages are sent and received via this single connection to the MQ server.
> Here's a telnet session that can be used to reproduce the problem (open jconsole and send 5 text messages to the queue):
> % telnet localhost 61613
> Trying 127.0.0.1...
> Connected to localhost.
> Escape character is '^]'.
> CONNECT
> ^@
> CONNECTED
> session:ID:starfish-53281-1213736462979-2:2
> SUBSCRIBE
> destination: /queue/testq
> ack: client
> activemq.prefetchSize: 1
> ^@
> MESSAGE
> message-id:ID:starfish-53281-1213736462979-3:3:1:1:1
> destination:/queue/testq
> timestamp:1213736837743
> expires:0
> priority:0
> 1
> BEGIN
> transaction: 1
> ^@
> ACK
> message-id:ID:starfish-53281-1213736462979-3:3:1:1:1
> transaction: 1
> ^@
> MESSAGE
> message-id:ID:starfish-53281-1213736462979-3:4:1:1:1
> destination:/queue/testq
> timestamp:1213736840224
> expires:0
> priority:0
> 2
> MESSAGE
> message-id:ID:starfish-53281-1213736462979-3:5:1:1:1
> destination:/queue/testq
> timestamp:1213736842611
> expires:0
> priority:0
> 3
> ABORT   
> transaction: 1
> ^@
> BEGIN 
> transaction:2
> ^@
> ACK
> message-id:ID:starfish-53281-1213736462979-3:4:1:1:1
> transaction:2
> ^@
> ABORT
> transaction:2
> ^@
> ACK
> message-id:ID:starfish-53281-1213736462979-3:5:1:1:1
> ^@
> I see a couple of issues here:
> #1) even though I specified activemq.prefetchSize to 1 in the subscription command, the connector dispatches two messages in a row
> #2) no more messages are dispatched after aborting the transaction/acknowledging the last received message. Even if the second message isn't wrapped in a transaction, message dispatch stops there.
> To add to the confusion, if I don't use transactions _at all_, my client keeps getting messages, one by one, ie. no two messages are sent together, I only get a new message after ACK'ing the previous one.
> I think I may be stepping into the realms of a buggy STOMP connector. Please tell me if I'm missing something obvious that fixes this issue
> (hence making it a non-issue) or if indeed the STOMP connector has problems.

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