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| MQ msgs sent to MDB's in clustered Websphere app servers |
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| david lightman |
 Posted: Sun Sep 03, 2006 5:42 am Post subject: MQ msgs sent to MDB's in clustered Websphere app servers |
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Newbie
Joined: 03 Sep 2006
Posts: 3
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When implementing a system what uses Websphere MQ for messaging infrastructure, thick java clients are able to send transactions(MQ messages) that are sent to a websphere application server to be processed by MDB's that subsequently pass the tran to biz service & eventually calls DAO layer for DB2 update. however, some of these message from the client must be kept in a strict order to be processed. I would like to have connection pooling on the MDB's so they can process all the messages concurrently, not just have set certain mdb's to MAX session = 1. What is the best solution for this scenario, has anyone else seen this where you must have strict message order but want to send to a was cluster that process concurretly? spinning these particular trans that must be kept in order off to separate system such as a msg broker? to be grouped etc... then passed to WAS?
thoughts anyone?
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| jefflowrey |
| Posted: Sun Sep 03, 2006 6:03 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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Usually, people design MQ systems to avoid message affinity - particularly when you need to spread them out over a large infrastructure.
What business justification is presented for requiring messages to be processed in a particular order?
Is it expected that you need to preserve message affinity across messages coming from multiple clients? Or just each client? If you only need to preserve the logical order of messages from a single client, then grouping is what you need. If you need to preserve logical order across multiple clients, then you're in for a big fun time.
Go back to the business requirements, and see if they can be met without requiring message affinity. Particularly look at what "should" happen if the *user* presents the messages in the wrong order.
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