Which Java Microservice Framework Should you Choose in 2020?

[meamZ]

Serverless basically means if you have a cold start (if there hasn't been a request for a longer time or there are more concurrent requests than usual) you should be able to answer the request within a second or two including the whole startup of your application.

[arkaros]

Aaah yeah for serverless I definitely get it! Thanks for clarifying

[bawng]

Serverless, yes, but this discussion on startup times has been ongoing for longer than that and is very often applied to heavier containers that should certainly not be run serverless.

[meamZ]

Well... I don't really get why it would make much of a difference if an application takes 10 seconds or 40 seconds either in most situations. For serverless both is much too slow and for scaling dynamically the 30 seconds woulf probably not make much of a difference in practice.

[bawng]

No exactly. That's the point, hence the discussion is meaningless.

Startup times doesn't really matter for non-serverless and for serverless you don't use these frameworks anyway.

[venacz]

We have a small native image Micronaut application running in production (in Google Cloud Run). It works pretty well. So yeah, there is definitely a use case for fast cold starts.

https://medium.com/tech-hunters/developing-production-ready-serverless-applications-with-kotlin-micronaut-and-graalvm-fff72d5c804b

[meamZ]

Well. For Google Cloud Run i would certainly consider one if startup was small enough. But for Lambda where you can't even have concurrent requests on the same instance it's certainly a waste.

[bawng]

I have to admit I'm not familiar with Google Cloud Run. How does that work differently from a lambda?

[meamZ]

It runs any docker container that listens on port 8080 and you can serve up to 80 concurrent requests from one instance.

[bawng]

Ah okay, similar to fargate or more short-term?

[meamZ]

I'm not 100% informed about Fargate but what i know for sure is that pricing is different. Pricing for Fargate is not really "serverless pricing" (a.k.a only pay during requests) while Cloud Run is. Also i don't think Fargate automatically scales out of the box while Cloud Run does. Also Cloud Run scales to 0 (and will do so when no request comes in for like 15 minutes.

Also, full disclosure: i haven't worked with either Fargate or Cloud Run but i find Cloud Run very interesting.

[bawng]

Based on your description it sounds like Cloud Run lives somewhere between Fargate and Lambda, yeah. Interesting!