Re: [jgroups-dev] Creating a STUNT protocol for JGroups?

Mike Jensen wrote:
> Thanks for your reply. You make excellent points and I agree, I don't
> think STUNT is very doable.

I looked a bit at STUN for UDP, and it's a bit more involved than I 
thought...

> I thought about using UDP, but I am not confident how my system will 
> work with it.

I think it'll work great. But make sure to add FRAG2 and UNICAST(2) to 
your config. It might even be faster as no connection management is 
required.

> I will spend some time playing with that today. but it
> might be a long startup time to learn the tools.

Which tools ?

> Any advice on what/how  to force packet loss in a udp system?

Yes, either generate a lot of traffic, so the switches start dropping 
packets, or use one of the JGroups protocols (such as DISCARD), or 
create your own protocol to discard random messages.

> Would NS2 be my best tool to simulate something like that?

AFAIR, ns2 was quite involved to get it running...

> With that said, I think it needs to be tested. But I can't point to any
> specific reason jgroups existing reliability mechanisms wont work. 

I think this will work brilliantly, especially given that this is all 
point-to-point unicasting, which doesn't require recipients to store 
messages, stability messages, distributed message garbage collection and 
so on !

> I expect that it will probably work fine. Knowing this first though will
> help me decide if I want to work on a STUN protocol.
>
> As always, thanks for your help!

np

-- 
Bela Ban
Lead JGroups / Clustering Team
JBoss

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