[jboss-cluster-dev] TCP vs. UDP

[Brian Stansberry]

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M Wagad wrote:
> We have 2 node JBOSS Cluster, and we are having performance issue, what 
> we found out is that if we turn of the slave server, and operate the one 
> master node (Changing the load balance to 100/0), we have much better 
> performance then when we have both of the running sharing the load with 
> 50/50 load balance.
>  
> Would changing the default Protocol of UDP to TCP make any difference in 
> terms of Performance?
>  
> I had come across these posts on the Net that praises TCP over UDP for 
> organizations that have less then 16 JBOSS Nodes :-
>  
> 
>  
> 
> For  TCP…
> 
>  
> 
> /“We experiment with another configuration using TCP/IP and show that 
> current J2EE application server clusters up to 16 nodes (the largest 
> configuration we tested) can scale much better with this configuration. /
> 
> /We attribute the superiority of TCP/IP based group communications over 
> UDP/IP multicast to a better flow control management and a better usage 
> of the network switches available in cluster environments.”/
> 
>  
> 
> And UDP..
> 
>  
> 
> “Having to support reliable multicast UDP communication is not a piece 
> of cake. Drop a couple of packets and you get only a fraction of the 
> throughput. Then lose the ordering of the packets and you are in a 
> slump. The situation can turn pretty sour if you use large messages that 
> get fragmented (more than one UDP packet). You only need to lose one 
> packet to lose your entire message - then you resend everything. The 
> point is that in unideal and congested conditions you start to miss TCP, 
> and it is probably extremely hard to beat its adaptive protocol that has 
> been perfected for so many years.”
> 
>  
> 
>  
> 
> I would also like to know if any companies out there make the change 
> from UDP to TCP and if they can share their experience with us.
> 
>  
> 
> Thanks
> M. Wagad.
> 
> 
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-- 
Brian Stansberry
Lead, AS Clustering
JBoss, a division of Red Hat
brian.stansberry at redhat.com