Lambda
- Lambda in VPC can only access S3 and DynamoDB via VPC endpoint if the service has no VPC options.
- Some third-part package has binary extension, you need to find a same env (arch and running env) to build it and package it to Lambda. For example, you need to find Python3.6 and linux to build Pillow package for Python lambda functions.
- Downloaded file can only be put in
/tmp/directory, and the size limitation is 512MB
Cognito
- field can't be updated after created (name, type, string length, number range)
- User can't be exported from pool
- Import user to pool requires user to reset the password
