Chapter 13. Designing for fault-tolerance

This chapter covers

  • What fault-tolerance is and why you need it
  • Using redundancy to remove single point of failures
  • Retrying on failure
  • Using idempotent operations to achieve retry on failure
  • AWS service guarantees

Failure is inevitable for hard disks, networks, power, and so on. Fault-tolerance deals with that problem. A fault-tolerant system is built for failure. If a failure occurs, the system isn’t interrupted, and it continues to handle requests. If your system has a single point of failure, it’s not fault-tolerant. You can achieve fault-tolerance by introducing redundancy into your system and by decoupling the parts of your system in such a way that one side doesn’t rely on the uptime of ...

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