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Lambda

Invoke

For some reason the last argument isa file. To output to stdout use /dev/stdout

aws lambda invoke --function-name $fn /dev/stdout

Limitations

https://docs.aws.amazon.com/lambda/latest/dg/limits.html

Maximum of 1000 executions at a time

Execution Time

  • Default is 6 seconds
    • Just change it to 30 seconds
  • Maximum is 15 minutes
  • When using with API Gateway, maximum is 30 seconds
  • When making web requests, it is easy to pass 6 second limit

Memory

  • Minimum is 128MB; goes up in 64MB increments
  • Max is 3GB
  • When using with Node.js and Express you have to increase to at least 192MB

Python

  • Debugging is a little harder
    • For some reason, output isn’t as clean as debugging using Node.js

Debugging

  • API Gateway
  • Try command line
    • sls invoke local —function $f —data $d
    • aws lambda invoke —function-name $f —post

When not to use Lambda?

  • You have more than 1000 concurrent connections
  • When you have predictable traffic
  • You need something that lasts longer than 15minutes
  • The latency to fire has to be fast
  • The deployed code is larger than 50mb

Why I like lambda (or faas in general)

I can treat it as a script that doesn’t have a dependency on my computer

Prototype Projects