Why is AWS building a JavaScript runtime?

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5 ай бұрын

General-purpose runtimes such as Node.js and Bun are not optimal for a constrained execution environment such as Lambda, because they're not designed for these environments.
The trade-offs and design decisions they make do not align with the constraints and needs of a Lambda customer.
That's why, instead of trying to make the general-purpose runtime fit into Lambda, it's worth asking "what would a purpose-built JavaScript runtime look like for Lambda?" and go from there.
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Пікірлер: 2

@gariklaw 4 ай бұрын

@theburningmonk Can you please give some concrete examples where cold starts are more spikey and stair-stepped? Just curious for specific use cases here. Thanks!

@theburningmonk 4 ай бұрын

It's not that cold starts are more spikey, but when you have sudden spikes in traffic, cold starts is more likely to be a concern. With the introduction of proactive initialization (see aaronstuyvenberg.com/posts/understanding-proactive-initialization) most cold starts will really impact users - e.g. when you do a deployment in the middle of the day, or when existing workers are replaced. But if you have a sudden spike in traffic, then you need more workers to handle the load, so Lambda would need to create new execution environments on-demand, and you'll see lots of cold starts in that moment. An example would be a social network, when a popular user posts something, suddenly everyone logs in and start interacting with the app. You can't plan for these kinds of spikes.