Lesson 10
Why did my post disappear?
Break it
Users post, then reload from a replica. Turn traffic up to 2,500 requests per second.
Users
1,000 req/s
Load balancer
splits evenly
2%
App servers
× 4
26%
Cache
Not added
Off
DB primary
reads + writes · large
26%
Read replicas
× 2
51%
p50 latency
94 ms
Failed requests
0.0%
Monthly cost
$620
Stale reads
0.0%