TTL and stale reads
Difficulty 1 of 5
Each second, 4,995 reads and 5 writes reach 1,000 keys. Tune the TTL. Fewer than 1 percent of the 299,700 reads may be stale. More than 80 percent must hit the cache.
1,600 keys · hit 81% · mean 3.2 ms
Goals and limits
- Stale reads
- under 2,997
- Hit ratio
- at least 80%
- p99 latency
- under 150 ms
- Monthly cost
- under 30 USD/mo
- Traffic
- 5,000 req/s