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| mq__quest |
 Posted: Thu Dec 15, 2022 7:32 am Post subject: MQIPT -cons |
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Apprentice
Joined: 21 Aug 2017
Posts: 49
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Hello experts,
Has anyone here used MQIPT? If yes, could you please list out any cons/limitations it may introduce.
Also do you know if it
1) makes troubleshooting difficult when there are channel connection issues?
2) does it cause the messages to be delivered out of order?
Thanks |
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| bruce2359 |
| Posted: Thu Dec 15, 2022 8:43 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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Other than posting here, what research have you done? What were the results?
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Lex Orandi, Lex Credendi, Lex Vivendi. As we Worship, So we Believe, So we Live. |
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| mq__quest |
| Posted: Thu Dec 15, 2022 9:09 am Post subject: |
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Apprentice
Joined: 21 Aug 2017
Posts: 49
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| bruce2359 wrote: |
| Other than posting here, what research have you done? What were the results? |
looked on the internet and Didn't find any answers. I guess MQIPT is not very popular or widely used. |
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| PeterPotkay |
| Posted: Thu Dec 15, 2022 2:53 pm Post subject: Re: MQIPT -cons |
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Poobah
Joined: 15 May 2001
Posts: 7722
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| mq__quest wrote: |
1) makes troubleshooting difficult when there are channel connection issues?
2) does it cause the messages to be delivered out of order?
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1) Troubleshooting is more complex because there is now another component sitting between the 2 ends of the channel. This additional component (MQIPT) is another potential point of failure, another set of logs to review. Its not impossible. Its not difficult once you are familiar with it, but it is more the deal with.
2) MQIPT does not cause messages to be delivered out of order.
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Peter Potkay
Keep Calm and MQ On |
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| mq__quest |
| Posted: Thu Dec 15, 2022 7:48 pm Post subject: Re: MQIPT -cons |
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Apprentice
Joined: 21 Aug 2017
Posts: 49
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| PeterPotkay wrote: |
2) MQIPT does not cause messages to be delivered out of order. |
In one of the IBM documents, it says, it is possible for messages to go out of order if "If a link in the network goes down and subsequent messages are rerouted along another link"
If we put MQIPT on more than one server and use it as active-active for HA, will it then cause messages go out of order in any situation? |
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| gbaddeley |
| Posted: Sun Dec 18, 2022 2:11 pm Post subject: |
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Jedi Knight
Joined: 25 Mar 2003
Posts: 2538
Location: Melbourne, Australia
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I'm not sure why you are concerned about MQ message order, as MQ does not guarantee message order, except in very specific circumstances.
If data order is critical, the message data should contain a sequence number which is handled by the consumer app. Ideally, it should be able to handle missing, duplicate and out of order numbers.
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Glenn |
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| fjb_saper |
| Posted: Mon Dec 19, 2022 5:47 am Post subject: Re: MQIPT -cons |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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| mq__quest wrote: |
If we put MQIPT on more than one server and use it as active-active for HA, will it then cause messages go out of order in any situation? |
This is really a specious question. You do not specify the number of consumers.
If you have more than 1 consumer, i.e. 1 consumer per MQIPT is considered as 2 consumers, you cannot per definition guarantee the sequence. Same if you use multiple threads on a threaded application.
if you are talking about a single application, single thread it is a FIFO order within priority, unless otherwise specified. Mind that if the network does not guarantee the FIFO from the sender you may still see sequence number disparities...
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