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| Default Algorithm used by MQ for Clustering |
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| John_peter |
 Posted: Tue Jun 29, 2004 9:27 pm Post subject: Default Algorithm used by MQ for Clustering |
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Novice
Joined: 10 May 2004
Posts: 22
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On what basis is the queue manager's queue selected during WLoad balancing(default)
The q owned by the queue manager that it sent to least recently
queue manager on the fastest channel(is it based on NETPRTY)??
queue manager that it sent to most recently
queue manager that is receiving the least number of messages |
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| kspranava |
| Posted: Tue Jun 29, 2004 10:49 pm Post subject: |
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Centurion
Joined: 27 Apr 2003
Posts: 124
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Yes, it is a combination of all.
Below is the round robin algorithm which WebSphere MQ uses by default.
Algorithm: The steps in choosing a destination for a message:
1. If a queue name is specified, eliminate queues that are not PUT enabled.
Eliminate remote instances of queues that do not share a cluster with the local
queue manager.
Eliminate remote CLUSRCVR channels that are not in the same cluster as the
queue.
2. If a queue manager name is specified, eliminate queue manager alias’ that are
not PUT enabled.
Eliminate remote CLUSRCVR channels that are not in the same cluster as the
local queue manager.
3. If the result above contains the local instance of the queue, choose it.
4. If the message is a cluster PCF message, eliminate any queue manager you
have already sent a publication or subscription to.
5. If only remote instances of a queue remains, choose Resumed queue managers
over Suspended ones.
6. If more than one remote instance of a queue remains, include all
MQCHS_INACTIVE and MQCHS_RUNNING channels.
7. If less than one remote instance of a queue remains, include all
MQCHS_BINDING, MQCHS_INITIALIZING, MQCHS_STARTING, and
MQCHS_STOPPING channels.
8. If less than one remote instance of a queue remains, include all
MQCHS_RETRYING channels.
9. If less than one remote instance of a queue remains, include all
MQCHS_REQUESTING, MQCHS_PAUSED and MQCHS_STOPPED channels.
10. If more than one remote instance of a queue remains and the message is a
cluster PCF message, choose locally defined CLUSSDR channels.
11. If more than one remote instance of a queue remains to any queue manager,
choose channels with the highest NETPRTY to each queue manager.
12. If more than one remote instance of a queue remains, choose the least recently
used channel.
(From redbook for clustering.) |
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