2010/2/12 Mark Thomas <ma...@apache.org>: > On 12/02/2010 15:20, Henri Gomez wrote: >> Hi to all, >> >> Some times ago, we discuss about mod_jk/cluster and more intelligent >> strategy to be use for the dispatching system. >> >> One point was to get system load informations about the various Tomcat >> instances involved in a cluster, to send request to the lowest loaded >> Tomcat. >> >> Hyperic Sigar, http://www.hyperic.com/products/sigar.html, seems to >> provide such informations for various OS. >> >> Could it be interesting to add such 'extension' to Tomcat, so it could >> be able to send back to jk/cluster so they could get the best >> decisions ? >> >> New commands could be added to AJP13, as done previously with >> cping/cpong, http://tomcat.apache.org/connectors-doc/ajp/ajpv13ext.html. >> >> What do you think about ? > > I like the general idea.
Thanks > My personal favourite in terms of implementation is to pass the > information via response headers as it allows interoperability with the > widest possible range of front-end load balancers. The info can be > passed back with every request or only for requests to a particular URL. Why not in response headers if it's discarded by the jk side. These informations shouldn't be send back to the browser (security concerns). > Then you get into how you measure load. I don't think that there will be > a one size fits all solution. I imagine that it would need to be fairly > easy for folks to implement their own load measurements. Using response > headers makes that simple to do providing we get the definition of that > header format right. In response header it will allow both mod_jk (ajp), or mod_proxy (http) to get such decision. Question, how to add such informations in Tomcat ? Extension ? --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@tomcat.apache.org For additional commands, e-mail: dev-h...@tomcat.apache.org
