Chapter 29. Case Study: Highly Available Platform
“You just call out my name,
And you know wherever I am
I’ll come running, oh yeah baby
To see you again.”
Carole King, “You’ve Got a Friend”
Many corporate software systems depend on a highly available platform. This chapter shows increasingly detailed acceptance tests for such a platform.
Context for Switching Servers
A highly available platform has at least two independent computers. If one goes down, the other available computers take over the load. If the servers are running close to capacity, not all the applications may be able to run. A predetermined priority mechanism determines which applications get to run. In addition to switching applications when a server goes down, in the case ...
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