Challenges

Meet the SLOs, survive the failure, stay on budget.

• Keep reads fast through a cache restart

  ☆☆☆
  • ✓goodput ≥ 99%
  • ⏱p99 < 80 ms
  • $$400/mo
  • ⚑1 invariant
  • ⚡1 failure

• Sell 100 seats without overselling

  ☆☆☆
  • ✓goodput ≥ 10%
  • $$400/mo
  • ⚑1 invariant
  • ⚡0 failures

• Charge once when payment acknowledgements drop

  ☆☆☆
  • ✓goodput ≥ 99%
  • $$400/mo
  • ⚑1 invariant
  • ⚡1 failure

• Survive primary failover without lost writes or split-brain

  ☆☆☆
  • ✓goodput ≥ 94%
  • $$500/mo
  • ⚑2 invariants
  • ⚡1 failure

• Eliminate stale reads on a 3-replica key-value ring

  ☆☆☆
  • ✓goodput ≥ 99%
  • $$500/mo
  • ⚑1 invariant
  • ⚡0 failures

• Preserve per-key queue order when workers hit slow tail spikes

  ☆☆☆
  • ✓goodput ≥ 99%
  • $$500/mo
  • ⚑1 invariant
  • ⚡0 failures