logger.resetKeys behavior during timeout

[adxzhang1]

I see in the sample, the finally block calls logger.resetKeys. What happens during lambda timeout - will those keys added from logger.appendKeys persist to the next request?

[dreamorosi]

Hi @adxzhang1, when there's a timeout the AWS Lambda service shuts down that execution environment and recycles it. So in practice, even if we don't clear the keys the state is lost, and a subsequent request would use another sandbox.

This is documented here:

At some point, suppose your function runs into an invoke failure (such as a function timeout or runtime error). [...] When this happens, the Lambda service performs a reset. The reset behaves like a Shutdown event. First, Lambda shuts down the runtime, then sends a Shutdown event to each registered external extension. The event includes the reason for the shutdown. If this environment is used for a new invocation, Lambda re-initializes the extension and runtime together with the next invocation.