Hi Kovi,
Thanks for your idea, but I don't think it quite fits my problem space.
I'll explain a bit more, with respect to what we're seeing here.
My understanding is that JMS will provide a mechanism to deliver messages
from a single publisher to all active subscribers of that publisher's topic.
All of these subscribers will receive the messages from the publisher in
EXACTLY the same order. And that's great but...
When we have multiple publishers of data on a topic, we are seeing that this
rule changes. The subscribers to that topic receive the messages from each
individual publisher in order, but the messages as a whole (at the
subscribers end are not ordered), ie.
Sub1 receives Pub1-1, Pub2-1, Pub2-2, Pub3-1, Pub1-2, Pub3-2
Sub2 receives Pub2-1, Pub1-1, Pub2-2, Pub2-2, Pub3-1, Pub3-2
Sub3 receives Pub3-1, Pub2-1, Pub3-2, Pub1-1, Pub2-2, Pub1-2
(or some other mixing of publishers messages)
Note in the example above Sub1 and Pub1 are using Router1, Sub2 and Pub2 are
using Router2, Sub3 and Pub3 are using Router3. In our scenario, we can
have ~70 multicast routers on the same LAN.
That leads me now to believe that to overcome this, I need to "elect" a
single machine on the network to be responsible for the delivery of ordered
messages (from multiple publishers). That is, Pub1, Pub2 and Pub3 all
publish messages to PubOrdered. A thread on only machine (and only that one
machine) subscribes to all messages on PubOrdered, and then pumps them back
on a SubOrdered topic. All subscribers (on all routers) read from this
topic only. Only in this way will all subscribers receive messages in
exactly the same order.
So before I embark on this design decision and its implications, can someone
please let me know if there is a way to make JMS messages published from
multiple routers arrive at each subscriber (on different routers) in the
same order, or do I have to "elect" a message orderer (a single publisher on
a single router).
Andreas (or others) please comment.
Regards,
Trent
-----Original Message-----
From: Gregor Kovač [mailto:[EMAIL PROTECTED]]
Sent: Friday, 15 June 2001 10:28 PM
To: [EMAIL PROTECTED]
Subject: [developers] Topic question
Hi!
Just now I have been reading some JMS specs and got this idea:
Whenever you have to ensure a particular order of messages you can use
priority on that message.
So in your case:
- x has the highest priority
- y medium
- z lowest
I hope this helps.
Best regards,
Kovi
At 03:54 14.6.01 +0200, you wrote:
>Hi all,
>
>Help! We are trying to deploy a federated network of SwiftMQ routers
(using
>multicast). Each machine in our network is running a copy of SwiftMQ. Is
>it possible to do the following...
>
>For a given topic, say 'transactions' we have multiple publishers and
>subscribers (on each machine).
>Is it possible (please say yes), to ensure that all subscribers in this
>federated network receive their messages in exactly the same order (whilst
>they are subscribing).
>
>Example: machine 1 publishes x, machine 2 publishes y, machine 3 publishes
>z
>All subscribers receive x, y and z (in that order) on all machines.
>
>Regards,
>Trent
>
>
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Kako si kaj
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