Re: CAO remoting and Web gardens
From: Ken Kolda (ken.kolda_at_elliemae-nospamplease.com)
Date: 09/24/04
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Date: Fri, 24 Sep 2004 12:45:41 -0700
If your client can access the web servers directly (as opposed to only
through a virtual IP that maps through a load balancer), the having a web
farm should work as you noted. A web garden is different though because
there are two processes that effectively share a single listener (IIS). Now
IIS doesn't know anything about remoting -- it just knows when it receives a
request to forward it to the to pass the request to the two processes in
round robin fashion -- it's not inspecting the requests' contents to see if
it's a remoting request and, if so, which process it should go to.
Ken
<SolDel@mercer.com> wrote in message
news:Ow5RsLmoEHA.1800@TK2MSFTNGP15.phx.gbl...
> Thanks Ken.
>
> I fully understand the concept of web gardens as relates to worker
> processes. One thing that I failed to mention was that this works on four
> servers in an NLB cluster. The fifth server is where we are having an
> issue. I find it hard to believe that the first four servers work as a
mere
> coincidence - but I can find no other reason.
>
> My observations indicate that when a CAO is marshaled, it uses the primary
> IP address on the primary adapter. In an NLB environment this is
typically
> the machines individual public IP address - which provides the required
> server affinity. My assumption was that there *may* be a similar
mechanism
> in the remoting infrastructure to supply process affinity so that
subsequent
> request for the same marshaled URI are routed to the same process (instead
> of following the round robin distribution).
>
> At this point, I have four machines that work, and two that do not. I am
> looking for some empirical evidence that can explain the discrepancy. Am
I
> just lucky in the case of the four? I bet not.
>
> Dolph
>
> "Ken Kolda" <ken.kolda@elliemae-nospamplease.com> wrote in message
> news:OTHPCwkoEHA.3900@TK2MSFTNGP10.phx.gbl...
> > If you're using CAOs from within an IIS-based remoting app then you
> > shouldn't use web gardens. When you use a web garden you are instructing
> > IIS
> > to spin up several distinct processes to handle your requests. Incoming
> > requests are then sent to these processes in a round robin fashion. Your
> > CAO
> > will live in whatever process it was first instantiated in. If
subsequent
> > requests come in for your CAO and those requests are sent to the wrong
> > process, the CAO can't be found so you get the "Requested service not
> > found"
> > error.
> >
> > Ken
> >
> >
> > <SolDel@mercer.com> wrote in message
> > news:uRTS$MkoEHA.2588@TK2MSFTNGP12.phx.gbl...
> >> I have come across an issue when using CAOs and enabling the Web garden
> >> on
> >> the process model. If gardening is disabled, eveything works fine. If
> >> it
> >> is enabled, the remote object is created and appears to marshal just
> >> fine,
> >> however, any calls on the proxy result in the standard error,
> >>
> >> System.Runtime.Remoting.RemotingException: Requested Service not
> > found.
> >>
> >> First, are CAOs supported under the Web garden process model? Second,
if
> >> supported, are there any special configurations that are required? Or
> >> any
> >> known issues?
> >>
> >> I get the same results on both of the following configurations:
> >> Windows 2000 w/ .NET 1.1
> >> Windows XP w/ .NET 1.1 SP1
> >>
> >> Thanks,
> >> Dolph Priest
> >>
> >>
> >
> >
>
>
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