September 2017
Intermediate to advanced
82 pages
1h 44m
English
Content preview from Reactive Microsystems
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Chapter 3. Microservices Come in Systems
One actor is no actor. Actors come in systems.
Carl Hewitt
In the spirit of famed computer scientist Carl Hewitt:1 one microservice is no microservice. Microservices come in systems.
Like humans, microservices are autonomous and therefore need to communicate and collaborate with others to solve problems. And as with humans, it is in the collaboration with others that the most interesting opportunities and challenging problems arise.
What’s difficult in microservices design is not creating the individual services themselves, but managing the space between the services. We need to dig deeper into the study of systems of services.
Embrace Uncertainty
What is not surrounded by uncertainty cannot be the truth.
Richard Feynman
As soon as we exit the boundary of the single-service instance, we enter a wild ocean of nondeterminism—the world of distributed systems—in which systems fail in the most spectacular and intricate ways; where information becomes lost, reordered, and garbled; and where failure detection is a guessing game.
It sounds like a scary world.2 But it is also the world that gives us solutions for resilience, elasticity, and isolation, among others. What we need is better tools to not just survive, but to thrive in the barren land of distributed systems.
We Are Always Looking into the Past
The contents of a message are always from the past! They are never “now.”
Pat Helland
When it comes to distributed systems, one constraint ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.