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MIRRORQ

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wastenzel

Posted: Wed May 27, 2009 11:18 am Post subject: MIRRORQ

Newbie

Joined: 27 May 2009
Posts: 1

Hi all-
I am using MIRRORQ to "copy" trades from one local queue to a remote queue to send to a separate server for dr/archive purposes. The issue that I am having is that after mirrorq runs it "moves" not "copies" the messages. I want to keep the original message in the source q but it keeps getting cleared. Any ideas? Is it possible to actually mirror the messages?

zpat

Posted: Wed May 27, 2009 11:21 am Post subject:

Jedi Council

Joined: 19 May 2001
Posts: 5866
Location: UK

I don't believe it clears it. Are they being removed by the application that is meant to read them?

If you have WMB, it's a lot easier to use a message flow to duplicate messages.

Vitor

Posted: Wed May 27, 2009 12:30 pm Post subject: Re: MIRRORQ

Grand High Poobah

Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA

wastenzel wrote:

The issue that I am having is that after mirrorq runs it "moves" not "copies" the messages. I want to keep the original message in the source q but it keeps getting cleared. Any ideas? Is it possible to actually mirror the messages?

A couple of points:

- the mirrorq exit is a piece of sample code not considered production strength. AFAIK the code as supplied does a copy not a move, and if you're using it in a high volume share trading environment be sure that non-production strength code will hold with some stress testing.
- as a piece of sample code you can change it to do whatever you want, including fixing whatever bug has been introduced that's causing the destructive read (if it is a bug in the exit).
- WMQ exits are considered an advanced task. It's surprisingly easy to cripple a queue manager with an inefficient exit; it's not that hard to bring a queue manager crashing down. Testing is everything.
- Browse through the forum to see a number of possibly useful discussions on why mirroring messages isn't always the best idea.
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