Systems-Design-2

Question 1

List Three Examples

Things you should recognize but say are out of scope

Answer 1

User Authentication
Load Balancing

Question 2

SLA

Answer 2

Service Level Agreement
Defines the promises made to users regarding metrics such as service availability

This is a legal document

Question 3

SLO

Answer 3

Service Level Objective
Promise made to users regarding specific metris such as incident resonse or uptime

Must be clear, and easily measured to determine if objective is fulfilled

Question 4

Give an example:

Latency SLO

Answer 4

Latency can exceed 300ms for only 5% of requests over 30-day period

Question 5

Availability SLO

Answer 5

Service might have an SLO that states it must have 99% availability over a calendar week

Question 6

List the three ways service availability can be measured

Answer 6

1. Client request success rate
2. Server request success rate
3. % of work done within established SLA (e.g. meets latency requirements)