Zero Downtime Deploys: What happens to any pending request in the old app after it receives SIGKILL

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Just reading render notes on Zero Downtime Deploys

After the new app is deployed and healthy, it mentions the following

  • We terminate the old version at this point by sending your app a SIGTERM signal. Most web servers automatically intercept SIGTERM and shut down gracefully. There is a grace period of 30 seconds to shut everything down. If your app is still up after 30 seconds, it is shut down via a SIGKILL signal.

After the old app receives SIGTERM, what happens to the pending request if they don’t finish by the time SIGKILL is sent?

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Hi there,

If your app is still up after 30 seconds, it is shut down via a SIGKILL signal

This line is key, if the service is still up then it will receive a SIGKILL

Regards,

John B

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