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Serverless: “It’s not scalable”
And other myths
Author: Jez Daniels BSc(Hons), GSM(NI), QGJM
@jezd7588 www.linkedin.com/in/jezd
TABLE OF CONTENTS
INTRODUCTION
It’s all about me
01
THE MYTHS
Assumptions made, wrongly,
about serverless
03
BACKGROUND
Unusual topic. Why I selected it.
02
THE END
It’s all over now
04
● Northerner
● Wales resident
● Multilingual
● AWS Certifications x 2
● Systems Architect & Developer
● Formerly web developer (full stack)
● Roles in UK, DK, NL
INTRODUCTION
BACKGROUND
Architecture?
Don’t use
serverless
Serverless?
That won’t work
Serverless?
I’m scared!
THE MYTHS
IT’S NOT SCALABLE
Serverless Architecture is
infinitely scalable
MEANS VENDOR LOCK-IN
It doesn’t have to be this
way. Tooling is the answer
COLD START NIGHTMARE
Cold starts are a factor, but
not necessarily bad
Really?
NOBODY USES SERVERLESS
MYTH - IT DOESN’T SCALE
SERVERLESS
FUNCTIONS SCALING
● On first invocation AWS
spins up instance to run
function handler.
● On completion, instance
remains available for a short
time for more requests.
● Can run multiple concurrent
instances
MYTH 2 - GOING SERVERLESS = VENDOR LOCK-IN
VENDOR LOCK-IN
● Risk increases with early
adoption, and extensive use,
of services offered by
industry leader
● Spread the risk to manage
the risk: Git, CodeShip etc
● Use multi-vendor frameworks
MYTH 3 - COLD STARTS ARE A BIG PROBLEM
COLD STARTS
● VPC connections no longer a
big contributor to cold start
times.
● Cold starts are a factor for first
invokations of the container
● Issue in Dev/test, maybe not in
Production
● Ping them to keep them warm
MYTH 4 - NOBODY USES SERVERLESS ARCHITECTURES
WHO USES SERVERLESS
THE END

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Serverless: It's not scalable, and other myths

  • 1. Serverless: “It’s not scalable” And other myths Author: Jez Daniels BSc(Hons), GSM(NI), QGJM @jezd7588 www.linkedin.com/in/jezd
  • 2. TABLE OF CONTENTS INTRODUCTION It’s all about me 01 THE MYTHS Assumptions made, wrongly, about serverless 03 BACKGROUND Unusual topic. Why I selected it. 02 THE END It’s all over now 04
  • 3. ● Northerner ● Wales resident ● Multilingual ● AWS Certifications x 2 ● Systems Architect & Developer ● Formerly web developer (full stack) ● Roles in UK, DK, NL INTRODUCTION
  • 5. THE MYTHS IT’S NOT SCALABLE Serverless Architecture is infinitely scalable MEANS VENDOR LOCK-IN It doesn’t have to be this way. Tooling is the answer COLD START NIGHTMARE Cold starts are a factor, but not necessarily bad Really? NOBODY USES SERVERLESS
  • 6. MYTH - IT DOESN’T SCALE
  • 7. SERVERLESS FUNCTIONS SCALING ● On first invocation AWS spins up instance to run function handler. ● On completion, instance remains available for a short time for more requests. ● Can run multiple concurrent instances
  • 8. MYTH 2 - GOING SERVERLESS = VENDOR LOCK-IN
  • 9. VENDOR LOCK-IN ● Risk increases with early adoption, and extensive use, of services offered by industry leader ● Spread the risk to manage the risk: Git, CodeShip etc ● Use multi-vendor frameworks
  • 10. MYTH 3 - COLD STARTS ARE A BIG PROBLEM
  • 11. COLD STARTS ● VPC connections no longer a big contributor to cold start times. ● Cold starts are a factor for first invokations of the container ● Issue in Dev/test, maybe not in Production ● Ping them to keep them warm
  • 12. MYTH 4 - NOBODY USES SERVERLESS ARCHITECTURES

Editor's Notes

  1. Introduce sections and briefly explain
  2. This is the most common, and usually the first cited, mis-conception about serverless architecture, usually followed by suggestions of using a fleet of large EC2 instances.
  3. Vendor lock-in is a risk, but so are most things we do. There are only two certainties: you pay tax and you die. I have heard experienced and highly qualified software developers use this as a reason not to Go Serverless.
  4. Cold starts are what they are. The myth here is about them being a big problem.
  5. Highly qualified software developers have been know to say that serverless should not be used because “nobody uses it” Here’s a few well known companies which do.