0: Lambda Overview

What’s Lambda?

• A compute service: Run code without provisioning servers
• Absolutely no touching server config
• Only charged when code is running
• It’s stateless and event-driven
• It can do anything that we can program.

How’s it work?

1. Receives some event trigger, perhaps from:
   • S3
   • DynamoDB
   • API Gateway
   • SES
   • Eventbridge
2. Run some code
3. Log the run

Lambda Requirements?

• Function code
• Memory size spec
• Execution timeout (15m max)
• IAM (execution) role
• Event source mapping

Lambda funcs can be chained together

What if you are dealing with longer time periods?

• Consider “step functions”
• Run multiple lambdas in parallel, potentially