RED for the service, USE for the disk

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Difficulty 2 of 5

Photo pages read 64 KB documents at 8,800 reads/s. Users see p99 5.7 s and 10 percent errors. API CPU: 33 percent. Document store: CPU 15 percent, disk operations 18 percent busy, disk throughput 113 percent of its 500 MB/s limit. Pick the fix. Budget: 70 USD/mo.

Play level

Options

  • Add 2 API servers
  • Double the document store CPU to 4 vCPU
  • Move the documents to a 1,000 MB/s disk volume
A graph for each resourceTap to add or remove the probes

Goals and limits

p99 latency
under 100 ms
Error rate
under 0.1%
Monthly cost
under 70 USD/mo
Traffic
8,800 req/s

Concepts

How players did

Player results load from the server.

All levels