If we have to reconnect to the database every time we run our Lambda functions (especially if we’re responding to an API request) then we are already adding over 200ms to the total response time. In my experience it typically takes more than 200ms. Setting up a new database connection is relatively expensive. However, since Lambda is stateless, you’ll most likely need to query a persistent datastore in order for it to do anything exciting. There’s no longer the need to run several underutilized processing servers just waiting for someone to request a large job.ĪWS Lambda is event-driven, so it’s also possible to have it respond to API requests through AWS’s API Gateway.
FaaS is great for a number of use cases (like processing images) because it will scale immediately and near infinitely when there are spikes in traffic. This is what’s known as a “ Serverless” architecture since we do not need to provision any servers in order to run these functions.
The ability to use this Functions-as-a-Service (FaaS) has dramatically reduced the complexity and hardware needs of the apps I work on. Update : I wrote an NPM module that manages MySQL connections for you in serverless environments.
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