Read replicas

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Level 27 of 41
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Difficulty 2 of 5

The database receives 10,000 reads and 1,000 writes/s. Add read replica capacity. Keep p99 below 100 ms and replica lag below one second.

The board at the start of the level

Copies and the write quorumDrag or use arrow keys to change the write quorum

Quorum 2 of 3 · commit 9.0 ms

Goals and limits

p99 latency: under 100 ms
Replica lag: under 1 s
Monthly cost: under 100 USD/mo
Parts you can add: Postgres
Part limit: 16
Traffic: 11,000 req/s

Concepts

Replication

How players did

Player results load from the server.