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Lambda Miscellaneous

Links: 102 AWS DVA Index

Miscellaneous

  • We use DLQs/Destinations with Lambda in asynchronous and event source mapping.
  • For logging:
    • For each lambda a log group is created.
    • The logs are then grouped into streams. We can find the logs if we go inside a particular stream.
  • Best Practices:
    • Perform heavy-duty work outside of your function handler
      • Connect to databases outside of your function handler
      • Initialise the AWS SDK outside of your function handler
      • Pull in dependencies or datasets outside of your function handler
    • Use environment variables for:
      • Database Connection Strings, S3 bucket, etc... don't put these values in your code
      • Passwords, sensitive values, etc can be encrypted using KMS
    • Minimise your deployment package size to its runtime necessities
      • Break down the function if need be
      • Remember the AWS Lambda limits
      • Use Layers where necessary
  • Avoid using recursive code, never have a Lambda function call itself. This can become very expensive.

Last updated: 2023-02-25