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Serverless

Only single App Engine App per project!

App Engine

Managed code runtime. Can build complete app stack like DB. Support for more languages. OR can use app engin flexible to containarise unsupported languages.

  • Service (Code execution) single service can support multiple revisions.
  • Version
    • Instance (Single or multi or autoscale)

Traffic splitting

When multiple versions are running, split can be done via IP, HTTP cookie or random selection. Http Cookie is preffered as user will end in same version.

Scaling

  • Standard : saves money by waiting until no instances are available to serve
  • Autoscale : Set threshold, CPU, throughput or Max concurrent requests.

By default app-engine will scale based on load. However can control and define scaling options. min_idle_instance can be used to maintain minimum number of instances.

Traffic splitting

When multiple versions are running, split can be done via IP, HTTP cookie or random selection. Http Cookie is preferred as user will end in same version.

Cloud functions

Like Lambda, limited number of languages. Ideal for reactive/event driven apps.

  • Default 1 min timeout, can be up to 9min. Https can be up to 60min!
  • Events : An action in Google cloud, eg pub/sub, s3
  • Trigger : A way to respond to event.
  • Function : Actual code.

Functions used when single function to be executed, App engine ideal for grouping multiple tasks. Pub/sub has only one event that is when message is published.