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| MQ Point to Point and Publish Subscribe and Network |
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Message
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| laddha |
 Posted: Thu May 01, 2003 10:40 pm Post subject: MQ Point to Point and Publish Subscribe and Network |
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Apprentice
Joined: 20 Mar 2003
Posts: 27
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Hi,
In MQSeries If I am using Public Subscribe Messaging,
1. Will the sender send only one message in the network.
And then each subscriber will read that message?
OR
Will the sender send individual messages to all subscribers?
2. I want to know what are Network Implications in using Publish-Subscribe?
Thanks and waiting for explanations.
-Prasanna |
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| vmcgloin |
| Posted: Fri May 02, 2003 12:26 am Post subject: |
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Knight
Joined: 04 Apr 2002
Posts: 560
Location: Scotland
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I believe the sender will send one message. When it reaches the broker that has subscribers registered, that broker may then pass on multiple copies of that message depending on the number of subscribers.
It has been a while though, so if someone knows better, then please correct me! |
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| bower5932 |
| Posted: Mon May 05, 2003 7:10 am Post subject: |
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Jedi Knight
Joined: 27 Aug 2001
Posts: 3023
Location: Dallas, TX, USA
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The subscribers will each get their own copy of the message. You can see this by having all of the subscribers share a single queue and watch the message count rise on it. A side item on this is that if you have subscribers that don't pick up their messages regularly, the depth of this queue will increase and have an effect on all subscriber's performance. This could be a reason to go with individual queues for each subscriber.
As far as network traffic is concerned, this definitely comes into play when you are dealing with a broker collective. The brokers will subscribe to other brokers on behalf of their subscribers. So, Broker A has 2 subscribers subscribing to a particular topic. Broker B has a publisher that is publishing on the particular topic. Broker B will only send one copy of the subscription to A rather than two. |
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