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olan022 · Posted: Mon May 12, 2008 5:50 am Post subject: CLWL

Hello,

I appear to have an issue regarding MQ as it relates to routing priority. I am simply trying to have three identical cluster queues on which one is a priority as such that it would only be used in the event that the other two are not reachable. I am running on Solaris with MQ V6.0.2.0.

I have three cluster queues called Q1 (all three have priority 5) on three separate physical servers.
If I test send 3 messages from a remote server (not local to any of the three cluster queues), each of the three Q1 queues will receive one message using amqsput. Thus far we have confirmed that the basic connectivity and clustering is working as expected.

Change the priority of one of the Q1 queues to 4.
Sending messages now only go to the priority 5 queues in round robin fashion â€“ thatâ€™s what we expect.
Now I break communication to the two priority 5 queues with the expectation that new messages would route to the remaining priority 4 queue.

This does not occur. Instead these messages go to the SYSTEM.CLUSTER.TRANSMIT.QUEUE waiting for the channels to open to the priority 5 queues, instead of attempting to use the available priority 4 queue.

Iâ€™ve looked at the manual and the CLWL algorithm and you could say this is by design, but what do I do if I am trying to design for network failures like this?

Thanks in advance.