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© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved.
B E N G A L U R U | M A Y 1 5 , 2 0 2 4
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved.
How we scaled our application
for 80K users by doing nothing!
Srushith Repakula
Head of Engineering, KonfHub
AWS Serverless Hero
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Agenda
1. The What?
2. The How?
3. Best Practices
4. Lessons learned
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved.
The What?
• An app to check-in attendees for events
• Works both offline and online
• Real time updates and auto sync of data across
devices
• Scale for an event with 80K attendees!
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved.
What did we do?
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Region
Amazon DynamoDB
Amazon Aurora
Stream
AWS AppSync AWS Lambda
Amazon Cognito Amazon CloudWatch
Amazon EventBridge Amazon Simple Email
Service (Amazon SES)
How did we do? (The 10,000 ft view)
AWS Amplify
In-app/
browser storage
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved.
“The How” - AppSync
• Serverless GraphQL APIs, with in-built support for real time
subscriptions using WebSockets
• Offline data synchronisation using Amplify DataStore
• Lambda-less integration with data sources like DynamoDB, RDS (using
data API) and much more!
• Fine-grained access control
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved.
AppSync in Action
30K
60K
90K
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved.
“The How?” - DynamoDB Global Tables
• Leveraged DynamoDB Global table to
replicate data across region, without any
changes to the application code
• Helps in disaster recovery and provides
a backup option
• Improves performance for global users
• Consistency and conflict resolution
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved.
“The How?” - The Scaling part
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved.
How to calculate concurrency?
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved.
How to calculate concurrency?
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved.
How to calculate concurrency?
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Reserved vs Provisioned Concurrency
• Max number of execution
environment instances
• Provisioned on-demand
• Cold starts still exist
• Throttled when the reserved
concurrency limit is reached
• No extra charges
• Pre-provisioned execution
environments
• No cold starts
• Function uses unreserved
concurrency if reserved
concurrency not set
• Extra charges applicable
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved.
So, what did we do? - Provisioned Concurrency
• Improved performance and reduced costs
• Cost per millisecond of execution time is
about ~60% cheaper
• Advisable only for functions that have
predictable and high throughput
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved.
So, what did we do? - Sizing Lambda Functions
• Choosing the memory allocated
to Lambda functions is an
optimization process that
balances speed (duration) and
cost
• Changing the Lambda instruction
set architecture - arm64 vs
x86_64
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Best Practices & Lessons Learned
• Leverage caching wherever feasible
• Keep an eye on the code initialization - the “init” duration
• Optimize function configuration to reduce cost and boost performance
• Identify components of your architecture that might not scale - non
Serverless components, and architect your application around this
limitation
• Load test and be prepared for things to fail!
• Look out for throttling and service limits
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved.
© 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Thank you! Please complete the session
survey in the mobile app
Srushith Repakula
@SrushithR

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How we scaled to 80K users by doing nothing!.pdf

  • 1. © 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved. B E N G A L U R U | M A Y 1 5 , 2 0 2 4
  • 2. © 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved. How we scaled our application for 80K users by doing nothing! Srushith Repakula Head of Engineering, KonfHub AWS Serverless Hero
  • 3. © 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved. Agenda 1. The What? 2. The How? 3. Best Practices 4. Lessons learned
  • 4. © 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved. The What? • An app to check-in attendees for events • Works both offline and online • Real time updates and auto sync of data across devices • Scale for an event with 80K attendees!
  • 5. © 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved. What did we do?
  • 6. © 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved. Region Amazon DynamoDB Amazon Aurora Stream AWS AppSync AWS Lambda Amazon Cognito Amazon CloudWatch Amazon EventBridge Amazon Simple Email Service (Amazon SES) How did we do? (The 10,000 ft view) AWS Amplify In-app/ browser storage
  • 7. © 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved. “The How” - AppSync • Serverless GraphQL APIs, with in-built support for real time subscriptions using WebSockets • Offline data synchronisation using Amplify DataStore • Lambda-less integration with data sources like DynamoDB, RDS (using data API) and much more! • Fine-grained access control
  • 8. © 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved. AppSync in Action 30K 60K 90K
  • 9. © 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved. “The How?” - DynamoDB Global Tables • Leveraged DynamoDB Global table to replicate data across region, without any changes to the application code • Helps in disaster recovery and provides a backup option • Improves performance for global users • Consistency and conflict resolution
  • 10. © 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved. “The How?” - The Scaling part
  • 11. © 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved. How to calculate concurrency?
  • 12. © 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved. How to calculate concurrency?
  • 13. © 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved. How to calculate concurrency?
  • 14. © 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved. Reserved vs Provisioned Concurrency • Max number of execution environment instances • Provisioned on-demand • Cold starts still exist • Throttled when the reserved concurrency limit is reached • No extra charges • Pre-provisioned execution environments • No cold starts • Function uses unreserved concurrency if reserved concurrency not set • Extra charges applicable
  • 15. © 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved. So, what did we do? - Provisioned Concurrency • Improved performance and reduced costs • Cost per millisecond of execution time is about ~60% cheaper • Advisable only for functions that have predictable and high throughput
  • 16. © 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved. So, what did we do? - Sizing Lambda Functions • Choosing the memory allocated to Lambda functions is an optimization process that balances speed (duration) and cost • Changing the Lambda instruction set architecture - arm64 vs x86_64
  • 17. © 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved. Best Practices & Lessons Learned • Leverage caching wherever feasible • Keep an eye on the code initialization - the “init” duration • Optimize function configuration to reduce cost and boost performance • Identify components of your architecture that might not scale - non Serverless components, and architect your application around this limitation • Load test and be prepared for things to fail! • Look out for throttling and service limits
  • 18. © 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved.
  • 19. © 2024, Amazon Web Services, Inc. or its affiliates. All rights reserved. Thank you! Please complete the session survey in the mobile app Srushith Repakula @SrushithR