High Performance Serverless Functions in Scala with AWS Lambda Learn how to build serverless functions in Scala with low response times and overall high performance.

1. High Performance Serverless
Functions in Scala
Scale BTB • November 14, 2019

2. Hello
Scale By
The Bay!

4. Hello
Scale By
The Bay!

5. High Performance Serverless
Functions in Scala
Scale BTB • November 14, 2019

6. High Performance Serverless
Functions in Scala
with AWS Lambda
Scale BTB • November 14, 2019

8. Vanilla Sally
And The Tale Of The
Growling Lambs!

11. Vanilla Sally & Growling Lambs
Vanilla Scala & Graal Lambda

12. Vanilla Scala
Compiled With
Graal For Lambda!

13. Let
Me Try To
Explain This

14. 1. Write your Lambda Functions in Vanilla Scala
2. Package to a big ol’ fat Jar
3. Compile to native Linux code with GraalVM
4. Setup a Serverless config w/ lots o mem
5. Deploy away!
Fast Scala Serverless Functions

15. Solution

16. Vanilla Scala
Compiled With
Graal For Lambda!

17. Okay, That’s The
Entire Talk
Let’s Run To The Snack Bar Before The Other Talks Finish

18. Problem

19. I Want To Write a Slack App...

20. Choosing Scala on AWS Lambda

21. Choosing Scala on AWS Lambda

22. What’s
The Challenge?

23. Slack App
Response Times
< 3 Seconds
api.slack.com

24. User Flow
Response Times
< 1 Second
Jakob Nielsen, Usability Engineering (1995)

25. Instantaneous Reaction
Response Times
< 0.1 Seconds
Jakob Nielsen, Usability Engineering (1995)

26. Well? We’re Waiting….

27. JVM on AWS Lambda is
Pretty Slow

28. Especially when
Booting the JVM

29. Slack
User Flow

32. “Native images compiled with
GraalVM ahead-of-time improve
the startup time and reduce the
memory footprint of JVM
applications.”

33. JVM vs GraalVM

34. So How Does
AWS Lambda
handle Native Code?

35. AWS Lambda Custom Runtime
1. [Your Linux Executable Initialization Here]
2. Do an HTTP GET
"http://${AWS_LAMBDA_RUNTIME_API}/2018-06-01/runtime/invocation/next"
1. Parse the API Gateway or SQS or other request
2. Repeat

36. Dockerfile
FROM oracle/graalvm-ce:1.0.0-rc16
WORKDIR /tmp/dist
CMD native-image -jar /tmp/target/app.jar --enable-
http
--enable-https -H:+JNI bootstrap

37. build.sh
(cd .. && sbt ";test;project query;assembly")
docker run -v "$(pwd -P)/target/scala-2.12":/tmp/target -v
"$(pwd -P)/dist":/tmp/dist buildable
(cd dist && zip -9 bootstrap.zip bootstrap cacerts
libsunec.so)

38. User Flow

43. Plain Scala Code
Reflection

44. JNI
Dynamic Class Loading

45. Apache HttpComponents
Most Scala Http Libraries

46. Jsoniter-Scala
Most Scala JSON Libraries

47. Hand-Written API Clients
Provided API Clients

48. reflectconfig.json
{
"name": "com.sun.xml.internal.stream.XMLInputFactoryImpl",
"methods": [
{
"name": "<init>",
"parameterTypes": []
}
]
}

49. Vanilla Sally
And The Tale Of The
Growling Lambs!

50. Vanilla Scala
Safely Compiles
With GraalVM

51. Okay, Probably I’m
Finished
Are There Any Good Snacks Left?

52. Introduction

53. Speaker Introduction

54. Jason Swartz
@swartzrock
WORK FUNCTIONAL PROGRAMMING