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1. Re: Use of Multiple RELAY bridges
dsb Dec 14, 2011 9:13 AM (in response to psylsph)1 of 1 people found this helpfulI far as I know it's not supported yet. Here's a thread I started on the JGroups mailing list, take a look at the last response from Bela Ban:
http://old.nabble.com/RELAY-usage-td32062001.html
"Speaking of which: we intend to try out my JBW demo on Infinispan 5.1 / JGroups 3.0 soon, to see if the changes I proposed in 4.2 have been forward ported to 5.1 correctly. The intention is to package this as a feature of the EDG product, so expect a lot more work in this area, better documentation and so on. I also have 2 JIRA issues open for JGroups 3.1, which will make RELAY better, plus I intend to add code to use RELAY between more than just 2 sites."
-David
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3. Re: Use of Multiple RELAY bridges
belaban Dec 14, 2011 9:58 AM (in response to psylsph)Yes, to use RELAY between more than 2 sites is not supported atm. However, I intend to look into this in the 3.1 release of JGroups. Incidentally, the topic came up today.
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4. Re: Use of Multiple RELAY bridges
psylsph Dec 14, 2011 10:07 AM (in response to belaban)Do you have a time frame for the release of 3.1? I ask because I'm doing a product evaluation and selection at the moment. I've down selected between Infinispan over JGroups and another product. Infinispan over JGroups looks good, however ideally we need a product that can handle unreliable communication between multiple sites.
Ideally I'd like to use RELAY, although there is always the possibity of running TCP_NIO for the geographically co-locationed sites and then using a RELAY to the further aways sites I suppose.
Stuart
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5. Re: Use of Multiple RELAY bridges
belaban Dec 14, 2011 10:22 AM (in response to psylsph)1 of 1 people found this helpfulNo, I don't have a hard date for the 3.1 release yet. I'd like to release it before next summer, but if there's an important chunk of functionality that's done, I might de-scope 3.1, pushing everything else into 3.2, and release earlier.
I just talked to a guy who needs to use RELAY for a content distribution network a la Akamai (or the MBone, if anyone remembers that). This requires a tree form, where sites can have child sites and so on, hierarchically structured.
If you have requirements, I'd like to hear them, so I can take them into account when tackling multi-site distribution.
Note that I created another issue regarding RELAY today: https://issues.jboss.org/browse/JGRP-1401.
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6. Re: Use of Multiple RELAY bridges
psylsph Dec 14, 2011 10:34 AM (in response to belaban)In terms of approach I have no feeling about whether a round robin of all the sites or a star approach is better. Except that it would be nice to have some kind of semi-automated fall over mechanism. Where for instance if the center node dies the relay co-ordinators hold a list that nominates who reforms the center of the star.