When you do that, it only keeps one instance warm. If you have 10 concurrent requests, even if one is warm, the other 9 requests will still experience a cold start.
The only way around this is to send a request that holds the connection open long enough to make sure concurrent requests start a new lambda instance. While you are keeping the request open, that lambda instance isn’t available for a real call.
If the entire purpose of lambda is to make things easier, once you start down the Rube Goldberg path of trying to keep enough instances warm, it kind of defeats the purpose. Just spend the money and the time to set up an autoscaling group of the smallest instances of EC2 or use Fargate if you don’t want the cold start times.
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