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| Cluster Question (remote defs in overlapping clusters) |
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| PeterPotkay |
 Posted: Thu Nov 21, 2002 1:48 pm Post subject: Cluster Question (remote defs in overlapping clusters) |
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Poobah
Joined: 15 May 2001
Posts: 7722
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Man, what a mess. Try and draw this one 1st before attempting to solve it!
QMA and QMB are in ClusterAB. QMA has a remote queue def called RequestQueue (RemoteQName=RequestQueue, RemoteQMname=QM1, XMITQ= blank)
QM1 and QM2 are in Cluster12. Each has a local queue called RequestQueue, and each one is clustered under Cluster12.
ClusterAB and Cluster 12 overlap. QMB is in both.
There is a QMAlias called QM1 on QMB. QM1 has QM1 as the RemoteQMname, and QM1.XMIT queue as the transmit queue. That transmit queue goes directly to QM1.
If an App on QMA puts to RequestQueue, wouldn't it's definition cause all the messages to go to QM1, via the QM1 Alias definition on QMB? Instead I see them round robin between QM1 and QM2. Why? Is there anyway the App on QMA can get all of its messages to QM1 consistently (without disabling the queue on QM2)? I thought the QMAlias along with the remote queue def would force that behavior.
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Peter Potkay
Keep Calm and MQ On |
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| nimconsult |
| Posted: Thu Nov 21, 2002 11:10 pm Post subject: |
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Master
Joined: 22 May 2002
Posts: 268
Location: NIMCONSULT - Belgium
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Wow! Is this a game or real life example?
I will first suppose that you do not have a xmitq named QM1, defined on QMA, attached to a channel going from QMA to QM1. If you had one, the message would go directly from QMA to QM1, without using any cluster feature. This is a possible solution to your problem, but it does not explain why you have the problem.
Now you DO NOT have a xmitq named QM1 defined on QMA. And you do not have a QM alias QM1 defined on QMA neither.
In this case my assumption is that your message follows this route:
- on QMA, RequestQueue resolves to QM1.RequestQueue.
- There is no local definition of QM1 on QMA.
- QMA finds a definition for QM1 in clusterAB; the definition is located on QMB, so QMA routes the message to QMB.
- On QMB, the situation is honnestly not clear to me. I would tend to say that QMB routes the message over QM1.XMITQ, but apparently this is not your case. It seems that the queue name is resolved at cluster level first. Because there are two definitions of the queue QMB does round robin the messages between QM1 and QM2. If you used BIND_ON_OPEN you would go to one queue manager only.
I would like to know how the message header looks like (including XQH) when transmitted from QMA to QMB, and from QMB to QM1 or QM2. Can you capture the message on the transmission queues and give us a dump of the message? I am wondering whether the message still has QM1 as destination queue manager?
_________________
Nicolas Maréchal
Senior Architect - Partner
NIMCONSULT Software Architecture Services (Belgium)
http://www.nimconsult.be |
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| PeterPotkay |
| Posted: Fri Nov 22, 2002 2:12 pm Post subject: |
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Poobah
Joined: 15 May 2001
Posts: 7722
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This is an existing set up I am trying to work in.
I deleted the QM Alias on QMB.
The set up is as follows now:
QMA and QMB are in ClusterAB. QMA has a remote queue def called RequestQueue (RemoteQName=RequestQueue, RemoteQMname=QM1, XMITQ= blank)
QM1 and QM2 are in Cluster12. Each has a local queue called RequestQueue, and each one is clustered under Cluster12.
ClusterAB and Cluster 12 overlap. QMB is in both.
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If I put messages to the remote queue def on QMA, they all go to QM1. Cool.
If I change the properties of the remote queue def to be (RemoteQName=RequestQueue, RemoteQMname=QM2, XMITQ= blank), they all go to QM2.
If I delete the remote queue def on QMA, and recreate it on QMB, the messages round robin. That I cant figure out. Why doesn't the RemoteQMname parameter in the remote queue def hold it to one QM like it did when the remote def was on QMA?
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Peter Potkay
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