In November of 2019, we announced AWS Lambda function state attributes, a capability to track the current “state” of a function throughout its lif

Coming soon: Expansion of AWS Lambda states to all functions

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2021-07-16 11:00:08

In November of 2019, we announced AWS Lambda function state attributes, a capability to track the current “state” of a function throughout its lifecycle.

Since launch, states have been used in two primary use-cases. First, to move the blocking setup of VPC resources out of the path of function invocation. Second, to allow the Lambda service to optimize new or updated container images for container-image based functions, also before invocation. By moving this additional work out of the path of the invocation, customers see lower latency and better consistency in their function performance. Soon, we will be expanding states to apply to all Lambda functions.

This post outlines the upcoming change, any impact, and actions to take during the roll out of function states to all Lambda functions. Most customers experience no impact from this change.

As functions are created or updated, or potentially fall idle due to low usage, they can transition to a state associated with that lifecycle event. Previously any function that was zip-file based and not attached to a VPC would only show an Active state. Updates to the application code and modifications of the function configuration would always show the Successful value for the LastUpdateStatus attribute. Now all functions will follow the same function state lifecycles described in the initial announcement post and in the documentation for Monitoring the state of a function with the Lambda API.