Re: [jgroups-users] Using JGroups on non-broadcast networks

On 31/05/16 18:17, Questions/problems related to using JGroups wrote:
> Are there an recommended configurations for using JGroups over
> networks that do not support broadcast or multicast messages?

Either TCP/TCP_NIO2 as transport, or UDP but with ip_mcast set to false. 
In both cases, multicasting cannot be used for discovery so PING or 
MPING cannot be used. Altrnatives are TCPPING, TCPGOSSIP, 
FILE_PING,S3_PING, GOOGLE_PING, JDBC_PING etc etc etc. Check out the 
manual for details.

> I'm guessing that some sort of unicast based relay would be in order to
> setup this up, but I guess the question is, does support for this
> exist within jGroups already?

Not sure I understood what you meant here...

> Also on a related note, are there any packages or classes that (if not
> used) that can be removed from the library (using proguard or
> something like it)?

You can remove
- org.jgroups.demos (demos)
- org.jgroups.tests (unit tests)
- From org.jgroups.blocks: all classes you don't need
- org.jgroups.blocks.auth: if you don't need authentication
- org.jgroups.protocols: remove all protocols you don't need

Depending on what functionality you use, you can remove a lot. If you 
for example use a UDP based stack only and not RPC functionality or 
other blocks, I guess you can shrink the JAR size by 70%.

> I'm primarily targeting android based platforms
> and frankly, jGroups is a large library (Android limits APKs based on
> the total number of method signatures). I've already stripped out JMX
> related content since JMX isn't available on Android. But is there
> anything else?


-- 
Bela Ban, JGroups lead (http://www.jgroups.org)


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