Range or hash

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  • Scale 09

Difficulty 3 of 5

A log table takes 16,000 events/s, all stamped now. A report reads one account's events from the last hour 200 times/s. Choose how to split four 1-vCPU shards. Keep CPU use below 70 percent and both p99 times below 100 ms.

Play level

Options

  • Split by time range
  • Split by a hash of the event ID
  • Split by account hash, ordered by time
Keys on a hash ringArrow keys add or remove a node. Tap to switch the hash.

Goals and limits

p99 latency (Append)
under 100 ms
p99 latency (Report)
under 100 ms
Error rate (*)
under 0.1%
CPU use
under 70%
Monthly cost
under 80 USD/mo
Traffic
16,000 req/s

Concepts

How players did

Player results load from the server.

All levels