I was just reading Dave Kerr’s piece
The Death of Microservice Madness in 2018.
Not just because it has an awesome title, but because it was trending on news.ycombinator.com for a while, and that is always a good quality signal.
And I’m all about quality. 🙂
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I quickly found that I agreed with him on a lot of points. There were also a bunch of serious criticisms in there that I hadn’t heard before.
Here are some of my comments on the piece:
Dave, this piece is genius. You hit on a lot of stuff here, and offered critical thought with such finesse. It’s not easy to stand up and be contrary to the trends!
o increased complexity for devs
– so true, setting up the entire suite of services on dev is tough
– and lets not forget about integration testing, which also becomes tough
Check out: The Myth of five nines
o systems have poorly defined boundaries
– very true. We can break them up into easy teams at the start, but over time things get messy, and they overlap.
o complexities of state
– Do you use a monolithic db? If so the architecture isn’t really microservices.
– If each service has it’s own, transactions that touch multiple services become very tough.
– And what about backups for all these individual databases?
– How about at restore time? How do you manage them all to restore at a SINGLE POINT IN TIME?
o Databases without schemas push logic into the application
– They sure do. And ones without complex joins do too. It’s a dirty little secret of NoSQL
Check out: How to hire a developer that doesn’t suck
o Versioning can be hard
– Absolutely. Sure each service has it’s own version, but as Dave says you have to manage cross version compatibility. if they are truly independent, this will drift over time, in and unpredictably complex way
– And what about backup versions?
o Distributed transactions
– with a monolithic db broken up into little pieces, sometimes… maybe often, you will need to do things across data in multiple services. then what?
I like the graphic Dave put together. It’s great. I do like serverless too. I’m also critical of it. I wrote a piece 30 questions to ask a serverless fanboy 🙂