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| Published messages and Sequence |
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| siljcjose |
 Posted: Mon Jul 15, 2013 5:27 am Post subject: Published messages and Sequence |
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Apprentice
Joined: 18 Aug 2005
Posts: 27
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Hi,
I have an application which is Publishing messages on 4 different topics.
There are subscriptions that are created for all the diferent topics to a queue.
Will MQ ensure that the messages are delivered to the queue in the same order in which it was published. Ie the first published message is the first message that arrives the queue via the subscription.
I understnad that the queue is in FIFO. Can we assume the same when publishing messages.
Regards,
Silj |
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| bruce2359 |
| Posted: Mon Jul 15, 2013 5:35 am Post subject: |
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Poobah
Joined: 05 Jan 2008
Posts: 9469
Location: US: west coast, almost. Otherwise, enroute.
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Messages arrive in a queue in the order they arrive. If there is only one putting/publishing application, and the queue/topic is local to that application, then there is little likelihood that messages might arrive out of order.
If, however, there are multiple putting applications, and/or the messages must traverse a network, then it is possible that messages might arrive out of order.
Messages are delivered out of the queue either FIFO or by priority - based on the message-delivery-sequence queue attribute.
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Lex Orandi, Lex Credendi, Lex Vivendi. As we Worship, So we Believe, So we Live. |
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| siljcjose |
| Posted: Mon Jul 15, 2013 5:39 am Post subject: |
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Apprentice
Joined: 18 Aug 2005
Posts: 27
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| The Message is published on the same queue manager and by just one application. There is no cluster involved as well. |
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| gbaddeley |
| Posted: Mon Jul 15, 2013 4:12 pm Post subject: |
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Jedi Knight
Joined: 25 Mar 2003
Posts: 2538
Location: Melbourne, Australia
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| Quote: |
| Will MQ ensure that the messages are delivered to the queue in the same order in which it was published. |
No. Applications cannot make any assumptions about the delivery order of MQ messages. If there is a requirement for message affinity or ordering, applications must be designed to perform the necessary marshalling.
Simple techniques are to combine all the data into one message or use MQ message groups. The most robust technique is to use a database to store messages and then process them as the order is fulfilled.
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Glenn |
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