How to win the game of trade-offs

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Delivered at the Serverless Summit 2022. Learn how to design serverless systems and tip the balance of trade-offs in your favour. To learn how to build production-grade serverless applications, check out my upcoming workshops at productionreadyserverless.com and get 15% off with the code "serverlesssummit22".

Technology

How to win the game of
trade-offs
Yan Cui
AWS Serverless Hero @theburningmonk

Yan Cui
http://theburningmonk.com
@theburningmonk
AWS user since 2010

Yan Cui
http://theburningmonk.com
@theburningmonk
Developer Advocate @

Yan Cui
http://theburningmonk.com
@theburningmonk
Independent Consultant
advise
training delivery

How to build a service for
scheduling one-off tasks
Calendar reminders
Stop cancelled subscriptions
…

Be explicit about the things that matter to you

Scheduling service for one-off tasks
Precision
Birthday reminder: within hours
Subscription service: within minutes
Multiplayer game: within seconds

Scheduling service for one-off tasks
Precision
Cost
Scalability
Hotspots

Be upfront about how much you care
about each of these in relative terms

Precision Cost Scalability Hotspots
?
? ?
?

Con
fi
rmation bias
The tendency to search for, interpret, favor, and recall information in
a way that con
fi
rms or supports one's prior beliefs or values

Scheduling service for one-off tasks
Precision
Cost
Scalability
Hotspots
time-to-market?
maintenance?
familiarity?
enterprise support?

Precision Cost Scalability Hotspots
$45
$15
$25
$15

Precision
Seconds Mins Hours Days …
OK! NOT OK!

Maintenance
Easier More Dif
fi
cult
OK! NOT OK!

Maintenance
Easier More Dif
fi
cult
OK! NOT OK!
Maintenance
Easier More Dif
fi
cult
OK! NOT OK!
Maintenance
Easier More Dif
fi
cult
OK! NOT OK!

Build vs Buy?
Serviceful
Prefer using a service until
it’s not feasible

It’s not you. This stuff is hard.
But you can get better at it with exercise

RemindMe
Google calendar competitor.
Users can set reminders for future events and receive SMS or
push noti
fi
cations 10 mins before the event.
RemindMe

RemindMe
Google calendar competitor.
Users can set reminders for future events and receive SMS or
push noti
fi
cations 10 mins before the event.
User reminders often cluster around public holidays and
sporting events. During which, the system needs to notify
millions of users.
RemindMe

Precision Cost Scalability Hotspots
$40
$35

Precision Cost Scalability Hotspots
$40
$35
$15

Precision Cost Scalability Hotspots
$40
$35
$10
$15

Precision Cost Scalability Hotspots
EventBridge Scheduler

Precision Cost Scalability Hotspots
EventBridge Scheduler
4

Precision Cost Scalability Hotspots
4
EventBridge Scheduler
10

Precision Cost Scalability Hotspots
4
EventBridge Scheduler
10 9

Precision Cost Scalability Hotspots
4
EventBridge Scheduler
10 9 3

3
Precision Cost Scalability Hotspots
4
EventBridge Scheduler
10 9
$40
$35
$10
$15

3
Precision Cost Scalability Hotspots
4
EventBridge Scheduler
10 9
$40
$35
$10
$15
4x15 10x10 9x40 3x35

3
Precision Cost Scalability Hotspots
4
EventBridge Scheduler
10 9
$40
$35
$10
$15
4x15 10x10 9x40 3x35
+ + +
625

Precision Cost Scalability Hotspots
Step Functions

Precision Cost Scalability Hotspots
Step Functions
10

4 states x 1,000,000 x $0.000025 = $100 per million scheduled events

Precision Cost Scalability Hotspots
Step Functions
10 1

1
Precision Cost Scalability Hotspots
Step Functions
10 9

1
Precision Cost Scalability Hotspots
Step Functions
10 9 5

1
Precision Cost Scalability Hotspots
Step Functions
10 9 5
$40
$35
$10
$15

1
Precision Cost Scalability Hotspots
Step Functions
10 9 5
$40
$35
$10
$15
10x15 1x10 9x40 5x35
+ + +

Precision Cost Scalability Hotspots
Step Functions
10 2 9 5
$40
$35
$10
$15
10x15 2x10 9x40 5x35
+ + +
695

Step Functions
EventBridge Scheduler
625 695

Step Functions
EventBridge Scheduler
625 695
Better at the things
we care more about

productionreadyserverless.com
15% OFF with “serverlesssummit22”

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How to win the game of trade-offs

1. How to win the game of trade-offs Yan Cui AWS Serverless Hero @theburningmonk

2. Yan Cui http://theburningmonk.com @theburningmonk AWS user since 2010

3. Yan Cui http://theburningmonk.com @theburningmonk Developer Advocate @

4. Yan Cui http://theburningmonk.com @theburningmonk Independent Consultant advise training delivery

6. How to build a service for scheduling one-off tasks Calendar reminders Stop cancelled subscriptions …

8. How to build a service for scheduling one-off tasks Calendar reminders Stop cancelled subscriptions …

10.

11.

12. Goal: win the game of trade-offs

13. Be explicit about the things that matter to you

14. Scheduling service for one-off tasks Precision Birthday reminder: within hours Subscription service: within minutes Multiplayer game: within seconds

15. Scheduling service for one-off tasks Precision Birthday reminder: within hours Subscription service: within minutes Multiplayer game: within seconds

16. Scheduling service for one-off tasks Precision Cost Scalability Hotspots

17. Be upfront about how much you care about each of these in relative terms

18.

19. Precision Cost Scalability Hotspots ? ? ? ?

20.

21. Be upfront about how much you care about each of these in relative terms

22. Con fi rmation bias The tendency to search for, interpret, favor, and recall information in a way that con fi rms or supports one's prior beliefs or values

23. Scheduling service for one-off tasks Precision Cost Scalability Hotspots

24. Scheduling service for one-off tasks Precision Cost Scalability Hotspots time-to-market? maintenance? familiarity? enterprise support?

25. Precision Cost Scalability Hotspots $45 $15 $25 $15

26. Precision Seconds Mins Hours Days …

27. Precision Seconds Mins Hours Days … OK! NOT OK!

28. Maintenance Easier More Dif fi cult

29. Maintenance Easier More Dif fi cult OK! NOT OK!

30. Maintenance Easier More Dif fi cult OK! NOT OK! Maintenance Easier More Dif fi cult OK! NOT OK! Maintenance Easier More Dif fi cult OK! NOT OK!

31. EventBridge Scheduler

32. Build vs Buy?

33. Build vs Buy? Serviceful Prefer using a service until it’s not feasible

34. It’s not you. This stuff is hard.

35. It’s not you. This stuff is hard. But you can get better at it with exercise

36. RemindMe Google calendar competitor. Users can set reminders for future events and receive SMS or push noti fi cations 10 mins before the event. RemindMe

37. RemindMe Google calendar competitor. Users can set reminders for future events and receive SMS or push noti fi cations 10 mins before the event. User reminders often cluster around public holidays and sporting events. During which, the system needs to notify millions of users. RemindMe

38. Precision Cost Scalability Hotspots ? ? ? ?

39. Precision Cost Scalability Hotspots $40

40. Precision Cost Scalability Hotspots $40 $35

41. Precision Cost Scalability Hotspots $40 $35 $15

42. Precision Cost Scalability Hotspots $40 $35 $10 $15

43. EventBridge Scheduler

44. Precision Cost Scalability Hotspots EventBridge Scheduler

45.

46. Precision Cost Scalability Hotspots EventBridge Scheduler 4

47.

48. Precision Cost Scalability Hotspots 4 EventBridge Scheduler 10

49.