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Microservices

by James Lewis and Martin Fowler

The term "Microservice Architecture" has sprung up over the last few years to describe a particular way of designing software applications as suites of independently deployable services. While there is no precise definition of this architectural style, there are certain common characteristics around organization around business capability, automated deployment, intelligence in the endpoints, and decentralized control of languages and data.

25 March 2014

article


Microservice Trade-Offs

Many development teams have found the microservices architectural style to be a superior approach to a monolithic architecture. But other teams have found them to be a productivity-sapping burden. Like any architectural style, microservices bring costs and benefits. To make a sensible choice you have to understand these and apply them to your specific context.

1 July 2015

article


Microservices and the First Law of Distributed Objects

When I wrote Patterns of Enterprise Application Architecture, I coined what I called the First Law of Distributed Object Design: "don't distribute your objects". In recent months there's been a lot of interest in microservices, which has led a few people to ask whether microservices are in contravention to this law, and if so why I am in favor of them?

13 August 2014

article


MicroservicePremium

The microservices architectural style has been the hot topic over the last year. At the recent O'Reilly software architecture conference, it seemed like every session talked about microservices. Enough to get everyone's over-hyped-bullshit detector up and flashing. One of the consequences of this is that we've seen teams be too eager to embrace microservices, not realizing that microservices introduce complexity on their own account. This adds a premium to a project's cost and risk - one that often gets projects into serious trouble.

13 May 2015

bliki


MonolithFirst

As I hear stories about teams using a microservices architecture, I've noticed a common pattern.

  1. Almost all the successful microservice stories have started with a monolith that got too big and was broken up
  2. Almost all the cases where I've heard of a system that was built as a microservice system from scratch, it has ended up in serious trouble.

This pattern has led many of my colleagues to argue that you shouldn't start a new project with microservices, even if you're sure your application will be big enough to make it worthwhile. .

3 June 2015

bliki

Microservices Talk

As with any bit of new architectural terminology, it's hard to get a decent definition of what microservices are, so this talk kicks off by tackling that, based on the article by James and I that helped fuel the interest. I then compare microservices to SOA, compare the architecture to a more monolithic approach, and outline important things you have to get right before you should deploy a microservice application.

15 January 2015

video


Testing Strategies in a Microservice Architecture

by Toby Clemson

There has been a shift in service based architectures over the last few years towards smaller, more focussed "micro" services. There are many benefits with this approach such as the ability to independently deploy, scale and maintain each component and parallelize development across multiple teams. However, once these additional network partitions have been introduced, the testing strategies that applied for monolithic in process applications need to be reconsidered. Here, we plan to discuss a number of approaches for managing the additional testing complexity of multiple independently deployable components as well as how to have tests and the application remain correct despite having multiple teams each acting as guardians for different services.

18 November 2014

infodeck


Don’t start with a monolith

by Stefan Tilkov

In the last few months, I’ve heard repeatedly that the only way to get to a successful microservices architecture is by starting with a monolith first. To paraphrase Simon Brown: If you can’t build a well-structured monolith, what makes you think you can build a well-structured set of microservices? The most recent – and, as usual, very convincing – rendering of this argument comes from Martin Fowler on this very site. As I had a chance to comment on an earlier draft, I had some time to think about this. And I did, especially because I usually find myself in agreement with him, and some others whose views I typically share seemed to agree with him, too.

I’m firmly convinced that starting with a monolith is usually exactly the wrong thing to do.

9 June 2015

article


MicroservicePrerequisites

As I talk to people about using a microservices architectural style I hear a lot of optimism. Developers enjoy working with smaller units and have expectations of better modularity than with monoliths. But as with any architectural decision there are trade-offs. In particular with microservices there are serious consequences for operations, who now have to handle an ecosystem of small services rather than a single, well-defined monolith. Consequently if you don't have certain baseline competencies, you shouldn't consider using the microservice style.

28 August 2014

bliki