Hi Willy, Thanks a lot for the reply.It was really helpful.
Are these sessions are a request from client? When a new request comes in to proxy,will it create a session? Regards, Pradeep On 26 April 2014 00:44, Willy Tarreau <[email protected]> wrote: > Hi Pradeep, > > On Sat, Apr 26, 2014 at 12:26:17AM +0200, Pradeep Kiruvale wrote: > > Hi All, > > > > I am new to HAProxy. For one of my project I am planning to > > add some functionality to HAProxy. > > I dont know where to start. > > > > I would like to know where in code base the calls are forwarded to > > backed servers > > It's not easy to describe. Basically, when there's no more analyser > holding the request, the connection automatically starts. That's > initiated in process_session(), look for SI_ST_REQ etc... you'll > see these functions. They pass through backend.c to select a > server and apply the LB algorithm. > > > I read about some queues,I dint get clear idea how they work? Is this > > queue one per backend server? > > One per server and one per backend (=farm). There are some diagrams > in doc/internal/ that I recommend that you take a look at. One of them > is about queueing. Another one is about stream interface states, which > I use from time to time when I have not touched that area for a long > time. You should also take a look at the various .txt files there. > > > When I say retry in config file,will it retry on main haproxy queue or > > when it comes to server queue. > > The retry applies to a connection error to a server. It will first retry > to the same server, but if only one retry is left and you have option > redispatch, it will retry on the backend instead and do its best to pick > a different server. > > > And also please let me know,where can I find some kind of HAProxy > > architecture documents. > > In doc/internal. That's what I'm using whenever I have a doubt about > something. > > Hoping this helps a little bit, > Willy > >
