Wide rows

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Difficulty 4 of 5

A large chat account has ten million messages. Each request asks for the latest 50. All messages of one user sit in one partition that keeps growing. Keep p99 below 100 ms.

Play level

TCPUsers500 req/sWide-column…2 vCPU · 2 GB
TCPUsers500 req/sWide-column…2 vCPU · 2 GB
The board at the start of the level
Keys on a hash ringArrow keys add or remove a node. Tap to switch the hash.

Hash ring · 3 to 4 nodes · 8 of 36 keys move

Goals and limits

p99 latency
under 100 ms
Monthly cost
under 100 USD/mo
Parts you can add
Wide-column DB
Part limit
16
Traffic
500 req/s

Concepts

How players did

Player results load from the server.

All levels