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From Juergen Mayrbaeurl <juergen.mayrbae...@hvb.sozvers.at>
Subject Re: Strict order of messages with redelivery
Date Fri, 07 Sep 2007 08:50:00 GMT

I did the same test with transacted sessions and the result is the same.
--> The order gets reversed after each attempt.

Anyone seen this behaviour before? James told me that it should work as
expected! What's about version 4.1.1? Fixed? Or: It's not a bug, it's a
feature.

Kind regards
Juergen


Juergen Mayrbaeurl wrote:
> 
> Unfortunately the ordering doesn't work with client acknowledge in 4.1.0
> as the following example shows
> 
> 1) 10 messages for topic produced
> 2) First attempt to receive the messages with a durable topic subscriber
> (acknowledment mode set to client acknowlede but not called for any of the
> messages)
> 
> Message ID: ID:hvb0396-1306-1189153233546-1:0:1:1:1
> Message ID: ID:hvb0396-1306-1189153233546-1:0:1:1:2
> Message ID: ID:hvb0396-1306-1189153233546-1:0:1:1:3
> Message ID: ID:hvb0396-1306-1189153233546-1:0:1:1:4
> Message ID: ID:hvb0396-1306-1189153233546-1:0:1:1:5
> Message ID: ID:hvb0396-1306-1189153233546-1:0:1:1:6
> Message ID: ID:hvb0396-1306-1189153233546-1:0:1:1:7
> Message ID: ID:hvb0396-1306-1189153233546-1:0:1:1:8
> Message ID: ID:hvb0396-1306-1189153233546-1:0:1:1:9
> Message ID: ID:hvb0396-1306-1189153233546-1:0:1:1:10
> 
> 3) Second attempt
> 
> Message ID: ID:hvb0396-1306-1189153233546-1:0:1:1:10
> Message ID: ID:hvb0396-1306-1189153233546-1:0:1:1:9
> Message ID: ID:hvb0396-1306-1189153233546-1:0:1:1:8
> Message ID: ID:hvb0396-1306-1189153233546-1:0:1:1:7
> Message ID: ID:hvb0396-1306-1189153233546-1:0:1:1:6
> Message ID: ID:hvb0396-1306-1189153233546-1:0:1:1:5
> Message ID: ID:hvb0396-1306-1189153233546-1:0:1:1:4
> Message ID: ID:hvb0396-1306-1189153233546-1:0:1:1:3
> Message ID: ID:hvb0396-1306-1189153233546-1:0:1:1:2
> Message ID: ID:hvb0396-1306-1189153233546-1:0:1:1:1
> 
> 4) Third attempt:
> 
> Message ID: ID:hvb0396-1306-1189153233546-1:0:1:1:1
> Message ID: ID:hvb0396-1306-1189153233546-1:0:1:1:2
> Message ID: ID:hvb0396-1306-1189153233546-1:0:1:1:3
> Message ID: ID:hvb0396-1306-1189153233546-1:0:1:1:4
> Message ID: ID:hvb0396-1306-1189153233546-1:0:1:1:5
> Message ID: ID:hvb0396-1306-1189153233546-1:0:1:1:6
> Message ID: ID:hvb0396-1306-1189153233546-1:0:1:1:7
> Message ID: ID:hvb0396-1306-1189153233546-1:0:1:1:8
> Message ID: ID:hvb0396-1306-1189153233546-1:0:1:1:9
> Message ID: ID:hvb0396-1306-1189153233546-1:0:1:1:10
> 
> As you can see the order gets reversed after each attempt. I'll do some
> further testing with tranacted sessions.
> 
> Kind regards
> Juergen
> 
> 
> James.Strachan wrote:
>> 
>> On 9/6/07, Juergen Mayrbaeurl <juergen.mayrbaeurl@hvb.sozvers.at> wrote:
>>>
>>> Hi!
>>>
>>> Our application has to make sure that all consumers with durable topic
>>> subscriptions get messages in strict order even when a message has to be
>>> delivered.
>>> E.g.
>>> Publisher puts message 1 to 10 on topic. Consumer opens a session, gets
>>> message 1, makes a client acknowledment, gets message 2, makes a client
>>> acknowledment, and so on. On message 3 a runtime exception occurs and no
>>> client acknowledment is done, but the session and the connection are
>>> closed.
>>> The next time the consumer opens a session message 4 gets delivered
>>> before
>>> message 3.
>>>
>>> What do we have to do to get message 3 (and not 4) as the first message?
>>> Do
>>> we have to use a special redelivery policy?
>> 
>> It should just work; though FWIW I'd recommend you switch from using
>> acknowledge to using JMS transactions. They are typically faster as
>> well as allowing you to do a rollback (rather than having to close the
>> session & connection on failure)
>> http://activemq.apache.org/should-i-use-transactions.html
>> 
>> 
>>> PS: We're using ActiveMQ 4.1.0
>> 
>> I'd also recommend you upgrade to 4.1.1
>> -- 
>> James
>> -------
>> http://macstrac.blogspot.com/
>> 
>> 
> 
> 

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