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| Cluster overhead |
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| noll |
 Posted: Fri Jan 09, 2004 5:58 am Post subject: Cluster overhead |
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Newbie
Joined: 10 Sep 2001
Posts: 6
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Hi All!
I wonder if there is a heavy administration message overhead in the clustering environment between the full repository queue managers in case of synchronisation? Our customer has a network bottlenecks and they are afraid of the extra traffic.
Thanx:
Krisztian |
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| JasonE |
| Posted: Fri Jan 09, 2004 6:38 am Post subject: |
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Grand Master
Joined: 03 Nov 2003
Posts: 1220
Location: Hursley
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Depends on what you call heavy overhead.
The internals of clustering use pub/sub style, ie when a qmgr joins a cluster, it registers with two of the full repositories and finds out about all the other full repos.
Partial repositories then cache information, so if you open a queue which it doesnt know about it will go off to the full repos to get that info and leave a registration to state it is interested in any changes to that object (and again to the qmgr it resides on). Therefore the traffic is minimal and flattens out once a use pattern emerges. The subscriptions are refreshed periodically and the only other network traffic are changes to objects it has registered interest in
Full repos duplicate the information they receive to the other full repos, so traffic between them is slightly higher. |
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| noll |
| Posted: Fri Jan 09, 2004 1:01 pm Post subject: |
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Newbie
Joined: 10 Sep 2001
Posts: 6
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Jason,
thank you for the answer! Let me ask you few more things:
1. Is there any communication between the full rep. qms if a qm ask for a new communication partner?
2. Is there any communication between the qms (a kind of broadcasting) if one of the qms goes to the full rep?
3. How big messages are sent in case of synchronisation between the full rep qms?
Thank you,
Krisztian |
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| JasonE |
| Posted: Fri Jan 09, 2004 1:11 pm Post subject: |
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Grand Master
Joined: 03 Nov 2003
Posts: 1220
Location: Hursley
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Note dont quote me on this as its from memory and understanding and may not be 100%
| Quote: |
| 1. Is there any communication between the full rep. qms if a qm ask for a new communication partner? |
Assuming by new communication partner you mean a qmgr that another partial has never spoken to, yes - There will be a subscription from the partial to 2x the full to find out the details, and that subscription is propergated around between the fulls.
| Quote: |
| 2. Is there any communication between the qms (a kind of broadcasting) if one of the qms goes to the full rep? |
I do not believe there is qm->qm comms in this case. There is no general broadcast to all qms when one partial finds out about another. I think the only time a broadcast effectively happens is when clusrcvr details change on any of the full repos.
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| 3. How big messages are sent in case of synchronisation between the full rep qms? |
How bigs a piece of string? No idea, but tiny in most cases (a bit like a pcf message) |
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