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MQSeries.net Forum IndexGeneral DiscussionStrict delivery of mq messages through transmission queue

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MABeatty1978
PostPosted: Fri Jul 14, 2017 9:58 am Post subject: Strict delivery of mq messages through transmission queue Reply with quote

Apprentice

Joined: 17 Jul 2014
Posts: 40

Is there a way to force strict sequential delivery of messages to a remote queue through a transmission queue? So that if messages 1, 2, 3, 4 are all put on a que, they are ensured to show up on the remote que in 1,2,3,4 order?
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Vitor
PostPosted: Fri Jul 14, 2017 10:52 am Post subject: Reply with quote

Grand High Poobah

Joined: 11 Nov 2005
Posts: 24444
Location: Ohio, USA

Yes - put them in a group and specify "logical sequence" in the get.

If you mean "can we enforce that every message, even with no relationship to each other, sent from now until the end of time, arrives in the order it was put?" then no you can't and you've just discovered why message affinity is a really bad design concept.
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bruce2359
PostPosted: Fri Jul 14, 2017 7:35 pm Post subject: Re: Strict delivery of mq messages through transmission queu Reply with quote

Poobah

Joined: 05 Jan 2008
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Location: US: west coast, almost. Otherwise, enroute.

MABeatty1978 wrote:
Is there a way to force strict sequential delivery of messages to a remote queue through a transmission queue? So that if messages 1, 2, 3, 4 are all put on a que, they are ensured to show up on the remote que in 1,2,3,4 order?

No, not really. What if one or more of the messages can't be delivered to the destination queue on the remote qmgr, and end up on the dead-letter queue?
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gbaddeley
PostPosted: Sun Jul 16, 2017 3:48 pm Post subject: Re: Strict delivery of mq messages through transmission queu Reply with quote

Padawan

Joined: 25 Mar 2003
Posts: 1700
Location: Melbourne, Australia

MABeatty1978 wrote:
Is there a way to force strict sequential delivery of messages to a remote queue through a transmission queue? So that if messages 1, 2, 3, 4 are all put on a que, they are ensured to show up on the remote que in 1,2,3,4 order?

It may be possible, but you should never design an application that relies on strict delivery order of MQ messages. MQ is not built around this paradigm. If you need sequencing in your application, use marshalling techniques such as inserting the messages in a DB and the retrieve in the desired order. The app logic needs to allow for delayed messages or messages arriving in advance.
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PaulClarke
PostPosted: Sun Jul 16, 2017 8:42 pm Post subject: Reply with quote

Sentinel

Joined: 17 Nov 2005
Posts: 848
Location: New Zealand

In most cases it should not be necessary to use a DB. As Vitor says you can just put them in a message group and ask your local Queue Manager to give them to you in the right order. Or, a more low-tech solution is just to out the data to one queue and have the 'command' sent to your processing queue. When you get 'command' you just retrieve the messages from the data queue in the right order. Clearly you would need some retry logic to cope with missing messages etc.

Cheers,

Paul.
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bruce2359
PostPosted: Mon Jul 17, 2017 8:35 am Post subject: Reply with quote

Poobah

Joined: 05 Jan 2008
Posts: 7817
Location: US: west coast, almost. Otherwise, enroute.

Please take some time to research 'mq assured message delivery'. Note that it is not 'guaranteed message delivery.'

An MQ MessageGroup is a programming option, but it does NOT guarantee delivery of messages to the destination queue (see my dead-letter queue reference above).

A requesting/producing application must be written to create a MessageGroup with a unique GroupId, and MQPUT messages within the MessageGroup, specifying the GroupId and MessageGroup flags.

The replying/consuming application must be written to MQGET messages that the producing app MQPUT within the MessageGroup, by specifying the GroupId, and MessageGroup flags.
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gbaddeley
PostPosted: Mon Jul 17, 2017 4:44 pm Post subject: Reply with quote

Padawan

Joined: 25 Mar 2003
Posts: 1700
Location: Melbourne, Australia

Message groups do not allow for infinite processing of a stream of messages that contain sequencing data, such as transaction number, or a phase sequence number within a transaction.

In many cases where Message groups could be used, it is actually easier to design a solution that combines the data into one larger message. However, the 100MB ceiling is a hard limitation.
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