On Tue, Feb 16, 2010 at 1:38 AM, Mladen Turk <mt...@apache.org> wrote:
> On 02/16/2010 10:21 AM, Mark Thomas wrote: > >> On 16/02/2010 09:08, Mladen Turk wrote: >> >>> On 02/16/2010 09:56 AM, Mark Thomas wrote: >>> >>>> The other thing it potentially allows is the cluster to tell the proxy >>>> about which nodes are in the cluster, allowing a more dynamic >>>> configuration. Not sure I'd want to use that in production, but in dev >>>> that could be useful. >>>> >>>> >>> Hmm, the zero conf is actually more desired in production then in >>> dev environments since it allows single point of admin and no need >>> for webserver reconfig. >>> >> >> Its just a personal opinion. I don't like any form of auto-configuration >> in production because I always feel I never quite know what it is doing >> or, more importantly, what it might do. >> > > Well it's zero conf inside web server only, so its conf is passed from > Tomcat, and that is certainly something strictly defined inside .xml or > via some manager app. > > There was attempt for creating AJP14 protocol, since the current one > lacks some IPC capabilities with the limited packed size being the major > problem. However I'd rather see mod_jk/isapi with http protocol then > creating > some AJP extensions or even completely new protocol. Network and processing > speed changed a lot since 90's so now there's almost no performance > difference > between AJP and HTTP implementations. With some new HTTP proposals for > connection reusing even that factor could be eliminated in the future. > > IMHO bi-directional communication is quite important - there are all kind of new protocols ( web socket, SPDY ) that requires it. You can have apache as a frontend for those protocols - but than you need AJP or mod_proxy to support it as well. I think the main driver for replacing ajp is the 2-directional protocols - and if we replace it, why invent a new protocol and not just adopt SPDY, which has all we need. There are some issues with SPDY - like the requirement to compress and do SSL, but we can easily tweak it. Regarding auto-conf , smarter load balancing and the other features enabled by 2-directional communication - in a large enough cluster they become quite important. Costin
