Clustering without IP multicasting.

simo Aug 16, 2002 4:43 PM

I am trying to build a HA-JNDI cluster that spans across two subnets and can't rely on multicast packets being propagated from one subnet to another.

Example scenario: Three nodes in partition "Main", two running in subnet 100.100.1.x and one running in subnet 100.100.2.x. Currently the nodes in subnet 1 share their naming context, but are unaware of the node in subnet 2, since no multicast packets can reach across.

What would be my options? Is there currently a configuration mode that would make this type of cluster work, or should I try to see what can be done by using JavaGroups API's directly? I am using Jboss version 3.0.0.
Thanks,
Simo

1. Re: Clustering without IP multicasting.

sgturner Aug 16, 2002 6:07 PM (in response to simo)

JavaGroups is highly configurable and can be configured for other protocols. Check out their website for details. www.javagroups.com
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2. Re: Clustering without IP multicasting.

belaban Aug 17, 2002 4:36 PM (in response to simo)

Hi Simo,

there's a couple of ways you can configure JavaGroups to do without IPMCAST:

- Use multiple UDP packets instead of 1 multicast packet. I doubt thought that this is going to work for you because if your router/bridge drops IPMCAST, then it will probably also drop UDP packets

- Use TCP and a gossip server: TCP establishes TCP connections between members and uses a so-called Gossip server (Java process) to lookup the initial membership (so members find each other).

- If you know on which hosts you will be running instances of JavaGroups (JBoss), you can get away without the Gossip server by using the TCP:TCPPING protocols.

Have a look at http://www.javagroups.com/javagroupsnew/docs/newuser/node63.html

It explain how to setup such a configuration.

I suggest you use some JavaGroups demo such as org.javagroups.demos.Draw to test this out before running JBoss.

Cheers,
Bela
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