See it move
Systems you learn by loading them up and breaking them.
Servers, queues and networks you can load up and break.
The real thing, not a picture of it. Try it.
01
Requests queue, caches fill and servers fall over, following the same rules the real thing does.
02
Raise the traffic, change the strategy, take a server out, and see what it does to latency.
03
Round robin against least connections is clearer when you’ve watched one of them fail.