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What Is a Flaky Test? Why It Costs More Than the Bug It Was Meant to Catch

A flaky test passes and fails on the same code. Nothing changed between the two runs except timing, ordering, or something outside the test that nobody was thinking about.

  • Flaky tests pass and fail unexpectedly on same code.
  • Caused by timing issues, order dependence, shared state.
  • Addressed by fixing underlying issue, not just increasing timeouts.

Low Latency and “Fast Enough”

What is low latency? Why is it different from domain to domain? And what is “fast enough”? Everybody wants their application to have low latency. This is obvious. The real question is: how low ?

  • Low latency varies by application and business case
  • Latency-sensitive flows divided into user experience, backend processes, and competing systems
  • Goal is to be "fast enough" for specific business case

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