Working from home means we need to self-manage a lot of things, from being our own IT people to getting our own food, to making our own coffee. Coffee is critical infra, so let us treat it as such, with a coffee service architecture. But it is not highly available. How do we make it highly available?

1. High Availability (HA)
Coffee
Gil Zellner @Heathenaspargus
High Availability (HA) Coffee

2. High Availability (HA)
is Super Important to Wix.
Gil Zellner @Heathenaspargus
High Availability (HA) Coffee

3. About Me
High Availability (HA) Coffee

4. Now:
Then:
AppsFlyer | Gett | Technion |Trackwise | Arkelis | Oracle | Cloudify
@Heathenaspargus
High Availability (HA) Coffee

5. Wix Engineering Locations
Ukraine Israel Lithuania
Kiev Tel-Aviv Vilnius
Dnipro Be’er Sheva
Haifa
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High Availability (HA) Coffee

6. Working From
Home
High Availability (HA) Coffee
@Heathenaspargus

7. High Availability (HA) Coffee
@Heathenaspargus
Be Own
Facilities
Manager

8. No Order
in lunch
High Availability (HA) Coffee
Provide
own lunch
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9. Be Your Own IT
High Availability (HA) Coffee
@Heathenaspargus

10. High Availability (HA) Coffee
Critical Infrastructure
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11. Pro’-gram-mer
An organism that converts
caffeine into code.
High Availability (HA) Coffee
@Heathenaspargus

12. High Availability (HA) Coffee
@Heathenaspargus
Critical Infrastructure

13. Current Coffee Architecture
High Availability (HA) Coffee
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14. Backend
Backend
Backend
Frontend Client
Current Coffee Architecture
High Availability (HA) Coffee
@Heathenaspargus

15. Backend
Backend
Backend
Frontend Client
Cache
Cache
Cache
Current Coffee Architecture
High Availability (HA) Coffee
@Heathenaspargus

16. Current Coffee Architecture
High Availability (HA) Coffee
Backend
Backend
Backend
Frontend Client
Cache
Cache
Cache
Can’t Handle the load
@Heathenaspargus

17. High maintenance,
very expensive
Illegal in Israel,
very expensive
High Availability (HA) Coffee
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Stronger Cache

18. Re-architect
our Coffee
High Availability (HA) Coffee
@Heathenaspargus

19. Define
our SLA
High Availability (HA) Coffee
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20. Backend
Backend
Backend
Frontend Client
Cache
Cache
Cache
Can’t Handle the load
High Availability (HA) Coffee
@Heathenaspargus

21. Backend
Backend
Backend
Frontend Client
Cache
Cache
Cache
Can’t Handle the load
High Availability (HA) Coffee
@Heathenaspargus

22. High Availability (HA) Coffee
Backend+
Cache
Backend
Backend
Frontend Client
Cache
Cache @Heathenaspargus

23. ./coffee.go:15:42: cannot use e (type *energy.Gas) as type coffeemachine.Electricity
in argument to coffeemachine.NewDelonghiMagnificaS:
*energy.Gas does not implement coffeemachine.Electricity (missing GetElectricity
method)
High Availability (HA) Coffee
@Heathenaspargus
Compile error

24. Replace frontend
High Availability (HA) Coffee
Backend+
Cache
Backend
Backend
Frontend Client
Cache
Cache @Heathenaspargus

25. ./coffee.go:15:32: cannot use e (type *energy.Gas) as type coffeemachine.Heat in
argument to coffeemachine.NewBialetti:
*energy.Gas does not implement coffeemachine.Heat (missing GetHeat method)
High Availability (HA) Coffee
@Heathenaspargus

26. Current Coffee Architecture
High Availability (HA) Coffee
Backend +
Cache
Backend
Backend
Frontend Client
Cache
Cache
Translation
layer
@Heathenaspargus

27. type Stove struct {
g gas
}
type gas interface {
GetGas()
}
func (s *Stove) GetHeat() {
fmt.Printf("Heating up...n")
time.Sleep(1 * time.Second)
}
func NewStove(g gas) *Stove {
return &Stove{g: g}
}
High Availability (HA) Coffee
@Heathenaspargus

28. Load Balancer
High Availability (HA) Coffee
CLB =
Coffee
Load
Balancer
Active
Passive
Client
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29. High Availability (HA) Coffee
The Code
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30. Takeaways
— If you don’t plan for HA, you will have to refactor later
High Availability (HA) Coffee
@Heathenaspargus

31. Takeaways
— If you don’t plan for HA, you will have to refactor later
— Refactoring can add functionality
High Availability (HA) Coffee
@Heathenaspargus

32. Takeaways
— If you don’t plan for HA, you will have to refactor later
— Refactoring can add functionality
— Invest in good coffee
High Availability (HA) Coffee
@Heathenaspargus

33. Q&A
Any questions?
High Availability (HA) Coffee

34. Thank You!
High Availability (HA) Coffee
Links:
https://github.com/gilzellner/HA-Coffee
@Heathenaspargus Gil.Zellner@gmail.com