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| prateekmquser |
 Posted: Tue Jan 25, 2011 6:36 am Post subject: Setting up 2 different transmission qs for sender channel |
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Newbie
Joined: 25 Jan 2011
Posts: 2
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I have a test case for which I want to configure MQ for a clustered environment.
I want to configure a channel in a QM such that it picks up messages from two different transmission queues.
Is such a configuration possible? |
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| Vitor |
| Posted: Tue Jan 25, 2011 6:46 am Post subject: Re: Setting up 2 different transmission qs for sender channe |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| prateekmquser wrote: |
| Is such a configuration possible? |
Not in a cluster.
Depending on what exactly you're trying to do it's possible you can achieve the same ends by different means.
If you're just testing for the sake of testing then tick the "no" box and move to the next test.
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Honesty is the best policy.
Insanity is the best defence. |
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| bruce2359 |
| Posted: Tue Jan 25, 2011 6:58 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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| Quote: |
| I have a test case for which I want to configure MQ for a clustered environment. |
A configuration other than explained/defined in the WMQ Clusters manual?
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| mqjeff |
| Posted: Tue Jan 25, 2011 7:11 am Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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I am confused.
What properties of channels control which xmitq they use? What does the documentation say on those properties? What values are allowed? |
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| fjb_saper |
| Posted: Tue Jan 25, 2011 3:17 pm Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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Haven't seen that scenario much. The usual one is 2 chls sharing an xmitq but there is only one that can be in a running status at a time ... 
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| prateekmquser |
| Posted: Wed Jan 26, 2011 2:26 am Post subject: |
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Newbie
Joined: 25 Jan 2011
Posts: 2
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Is there such a scenario possible if there is no cluster?
I want to configure two different transmission queues for one sender channel. When you define a sender channel you have to specify a transmission queue for that from where it picks up the message. |
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| exerk |
| Posted: Wed Jan 26, 2011 2:53 am Post subject: |
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Jedi Council
Joined: 02 Nov 2006
Posts: 6339
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| prateekmquser wrote: |
| ... When you define a sender channel you have to specify a transmission queue for that from where it picks up the message... |
Well spotted...you might also wish to see the options an MCA makes when it opens an XMITQ, which will give you a big clue as to why what you want to do is not a good idea. What possible earthly reason do you have for this 'requirement'?
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| bruce2359 |
| Posted: Wed Jan 26, 2011 6:45 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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| Quote: |
| I want to configure a channel in a QM such that it picks up messages from two different transmission queues. |
What is the objective of this test? What outcome do you expect from this test? How would this configuration be used at your shop?
| Quote: |
| Is such a configuration possible? |
At the sending of a channel, the Message Channel Agent, not the qmgr, gets messages from a single transmission queue, and sends the messages to its partner MCA at the receiving end.
The sending MCA opens the xmit queue INPUT_EXCLUSIVE so that other MCAs and applications cannot consume messages from the xmit queue.
So, no, it is not possible to have multiple sender channels getting messages from a single xmit queue. This makes sense if you understand the purpose of a message channel, message channel agents, and how messages are sent in batches and units of work.
The WMQ Intercommunications manual is a great resource for understanding channels.
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Lex Orandi, Lex Credendi, Lex Vivendi. As we Worship, So we Believe, So we Live. |
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| mqjeff |
| Posted: Wed Jan 26, 2011 6:59 am Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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It's not possible to have more than one channel actively reading from the same XMITQ at the same time.
It is likewise not possible to put more than one queue name into any XMITQ parameter.
So it is not possible to have one channel actively reading from TWO XMITQs at the same time..
The product simply does not work this way, as is clearly documented. |
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| Mr Butcher |
| Posted: Wed Jan 26, 2011 7:13 am Post subject: |
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Padawan
Joined: 23 May 2005
Posts: 1716
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i do not see the need to have 1 channel process 2 xmitqs. you can do proper mq object definitions and all will end up in 1 xmitq.
if you have 2 xmitqs A and B and 2 channels A and B, and A is down and you want to send it all to B, then you can have a second channel for XMTIQA, or move the messages from XMITQ A to XMITQ B.
maybe tell us more what kind of situation you are trying to cover with your 2xmitq-1channel relationship
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| fjb_saper |
| Posted: Wed Jan 26, 2011 8:55 pm Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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| Mr Butcher wrote: |
if you have 2 xmitqs A and B and 2 channels A and B, and A is down and you want to send it all to B, then you can have a second channel for XMTIQA, or move the messages from XMITQ A to XMITQ B.
maybe tell us more what kind of situation you are trying to cover with your 2xmitq-1channel relationship |
 
I would say it is cleaner to have a third channel definition (C) using the same XMITQ A As channel A is down there should not be a problem getting exclusive input for channel C on XMITQA. And no need to move any messages from xmitq A to xmitq C...
This would lead to 1xmitq 2channels relationship as opposed to 2 xmitqs 1 channel ...
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| exerk |
| Posted: Thu Jan 27, 2011 1:30 am Post subject: |
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Jedi Council
Joined: 02 Nov 2006
Posts: 6339
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| fjb_saper wrote: |
...I would say it is cleaner to have a third channel definition (C) using the same XMITQ A As channel A is down there should not be a problem getting exclusive input for channel C on XMITQA. And no need to move any messages from xmitq A to xmitq C...
This would lead to 1xmitq 2channels relationship as opposed to 2 xmitqs 1 channel ... |
Although it should be borne in mind that the 'back-up' channel may fail to start for the same reason that caused the 'primary' channel to fail in the first place, which is why I wonder at the utility that the OP is looking for 
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It's puzzling, I don't think I've ever seen anything quite like this before...and it's hard to soar like an eagle when you're surrounded by turkeys. |
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| bruce2359 |
| Posted: Thu Jan 27, 2011 6:23 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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| Quote: |
| the 'back-up' channel may fail to start for the same reason that caused the 'primary' channel to fail in the first place, |
Having a second or third sender channel standing by in case the first one fails sounds like a fine idea, and a simple solution.
Will you have a 2nd or 3rd nic card, too? Will you have a 2nd or 3rd network path between qmgrs? Will you have a 2nd or 3rd NAT box? A 2nd or 3rd qmgr instance? A 2nd or 3rd computer facility?
When contemplating any disaster-recovery scenario like this one, start by listing the top 5 or 10 reasons that a channel would fail. Then brainstorm a solution for each.
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Lex Orandi, Lex Credendi, Lex Vivendi. As we Worship, So we Believe, So we Live. |
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| exerk |
| Posted: Thu Jan 27, 2011 6:52 am Post subject: |
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Jedi Council
Joined: 02 Nov 2006
Posts: 6339
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| bruce2359 wrote: |
| Having a second or third sender channel standing by in case the first one fails sounds like a fine idea, and a simple solution. |
My point was that if the 'primary' channel goes down, e.g. queue full and/or no DLQ available or full at the receiving end, the 'back-up' channel is going to be of as much use as a chocolate fireguard, not that it was a bad idea. I was just trying to elicit from the OP his requirement.
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It's puzzling, I don't think I've ever seen anything quite like this before...and it's hard to soar like an eagle when you're surrounded by turkeys. |
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| bruce2359 |
| Posted: Thu Jan 27, 2011 7:19 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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completely.
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I like deadlines. I like to wave as they pass by.
ב''ה
Lex Orandi, Lex Credendi, Lex Vivendi. As we Worship, So we Believe, So we Live. |
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