Hi BW, On Feb 1, 2012, at 9:31 AM, BW wrote:
> Please help clarify: > > The dispatching of a user query to multiple geographicaly seperated nodes is > basically layer 7 routing via HTTP redirect. The routing traversal entry > point is a nodes web service endpoint where the query for each node is > injected as an HTTP Servlet Request. Yep, you got it. And, from there, a user may connect to the Web Grid node, and get a set of profiles, which point at *other* profile servers, and nodes, potentially or *other* product servers, or simply data, and URLs. > > I'm a liitle confused. I thought that a query was done as above and also > broadcasted via base64 encoded xml packes at layer 3. It really depends on whether you are dealing with request (which I would characterize as similar to your above scenario) or reply (which would be a product server style response in your bottom one). Does that make sense? Cheers, Chris ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Chris Mattmann, Ph.D. Senior Computer Scientist NASA Jet Propulsion Laboratory Pasadena, CA 91109 USA Office: 171-266B, Mailstop: 171-246 Email: [email protected] WWW: http://sunset.usc.edu/~mattmann/ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Adjunct Assistant Professor, Computer Science Department University of Southern California, Los Angeles, CA 90089 USA ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
