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Maybe it shares a beam instance per AWS account. Definitely curious about the isolation level of lambda in general since the same comment also applies to the JVM.

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This means AWS would keep a beam instance running for you the entire time? I doubt that

I assume it'll cold boot one up for you if you didn't already have on running on first request, keep it around for a while, and when it becomes idle for a while, shut it down. There's a lot of blog content out there to try to ping lambda enough so the instance stays around to avoid the cold boot issue.

If only there were a feature of lambda where it stayed up all the time...

EC2 ?

Never having a cold boot isn't quite the same as being able to set a minimum concurrency level, though both would be very valuable.

At re:invent this year, someone on the Lambda team indicated that they were working on something in this space, but couldn't say exactly what, or give any real timeline.

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