May 2007
Intermediate to advanced
610 pages
20h 14m
English
Content preview from Learning WCF
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Load Balancing and Failover
A very important consideration for scalable enterprise services is distribution,
load-balancing, and session failover across multiple server machines. A single host process
is not likely to handle more than 350 to 500 requests per second on average, thus the need
for multiple processes and eventually multiple server machines to support the load. In a
simple case where sessions are not involved (BasicHttpBinding or WSHttpBinding without
reliable session or secure session), the distribution of work across server machines can be
handled with load balancing techniques using
hardware-level routing or Windows Network Load Balancing (NLB), for example.
Without sessions, it doesn’t matter which server machine processes each request; the load can be distributed based on round-robin system, or more intelligent algorithms that detect the most available server. Figure 5-19 illustrates the same proxy making subsequent calls across multiple server machines.
Figure 5-19. PerCall services do not require server affinity
The minute that sessions are introduced, it is important that requests are forwarded to the server maintaining the session. This requirement applies to any type of session, including application sessions, transport sessions, reliable sessions, and secure sessions. In the case of application sessions, the same service object must be allocated, as shown in
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.