Chapter 1. Cassandra's Approach to High Availability
What does it mean for a data store to be "highly available"? When designing or configuring a system for high availability, architects typically hope to offer some guarantee of uptime even in the presence of failure. Historically, it has been sufficient for the vast majority of systems to be available for less than 100 percent of the time, with some attempting to achieve the "five nines", or 99.999, percent uptime.
The exact definition of high availability depends on the requirements of the application. This concept has gained increasing significance in the context of web applications, real-time systems, and other use cases that cannot afford any downtime. Database systems must not only guarantee ...
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