Re: http://www.ietf.org/internet-drafts/draft-ietf-opes-protocol- re qs

Rochberger, Haim wrote:
> Is it still possible to add this requirement ? I mean chaining callout 
> servers ?
> This may improve the performance in case you have a few callout servers 
> that need to handle a specific message in order.
Callout server chaining would add a lot of complexity to callout 
transactions and callout servers, e.g. in terms of error handling, 
fail-over, tracing, trust relationships etc. I can only see performance 
benefits in cases where the distance between the callout servers is 
shorter than the distance between the OPES processor and the callout 
servers. However, I think whenever the performance of callout 
transactions is critical, it is much more likely that the callout 
servers will be co-located with the OPES processor, i.e. in the same 
domain. Hence the distance between the OPES processor and callout 
servers would be similar to the distance between the callout servers and 
there wouldn't be much of a performance benefit any more with callout 
chaining.
-Andre