Deregistration delay

Elastic Load Balancing stops sending requests to targets that are deregistering. By default, Elastic Load Balancing waits 300 seconds before completing the deregistration process, which can help in-flight requests to the target to complete. To change the amount of time that Elastic Load Balancing waits, update the deregistration delay value.

The initial state of a deregistering target is draining. After the deregistration delay elapses, the deregistration process completes and the state of the target is unused. If the target is part of an Auto Scaling group, it can be terminated and replaced.

If a deregistering target has no in-flight requests and no active connections, Elastic Load Balancing immediately completes the deregistration process, without waiting for the deregistration delay to elapse. However, even though target deregistration is complete, the status of the target is displayed as draining until the deregistration delay timeout expires. After the timeout expires, the target transitions to an unused state.

If a deregistering target terminates the connection before the deregistration delay elapses, the client receives a 500-level error response.

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