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Micro Services
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Will Hamill
March 13, 2014
Programming
1
100
Micro Services
Presentation given at Codeslice event on micro-services.
Will Hamill
March 13, 2014
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Transcript
μServices { } March 2014 Will Hamill
DISCLAIMER: I am not an expert We are working (somewhat)
in this direction on some projects But this is based mostly on content from QCon London 2014
Applications are getting larger
Services are getting smaller
Services have been getting smaller for some time
Monolithic
Layered
Service-Oriented
Micro-Services
How?
A micro-service typically does only one thing User Authentication and
Role Based Authorisation Service User Authentication Role Based Authorisation
Anatomy of a micro service HTTP Logic Monitoring Storage
Techs: no hard and fast rules Simpler, lighter, self-contained services
need simpler and lighter technologies
None
Why?
Simplicity (at the service level)
3,000 LOC vs 200 LOC 100 LOC 500 LOC 400
LOC 200 LOC
Scale (distribute load and apps across machines)
Scaling the monolith
Scaling the monolith
Scaling the monolith …
Scaling micro-services
Scaling micro-services
Scaling micro-services
Scaling micro-services …
Scale 2: Scale Harder (many teams one on project)
Division of labour
Division of labour
Responding to change (decoupling delivery)
Release Schedule Every 6 months
Every 2 weeks Every week Every 4 weeks About every
4 days
Fault tolerance (fault acceptance)
Fragile Robust Antifragile
Who?
Netflix Twitter Amazon Yammer MailOnline
Not Quite There Yet
BandwagonDB
DRY-ed Out “core”
Service-Oriented Monolith
Difficulties
Testing everything is harder (but testing services is easier)
Fast, automated deployment and application monitoring are super-important
Versioning can be tricky www.semver.org
Conway’s Law
This Is New
This is an emerging approach Find which tradeoffs work best
for your particular situation
“It depends” ¯\_(ツ)_/¯
Further Reading http://www.infoq.com/presentations/Micro-Services http://vimeo.com/user22258446/review/79288222/cbb24b224c http://yobriefca.se/blog/2013/04/29/micro-service-architecture/ http://martinfowler.com/articles/microservices.html http://davidmorgantini.blogspot.co.uk/2013/08/micro-services- introduction.html http://qconlondon.com/dl/qcon-london-2014/slides/ AdrianCockcroft_MigratingToMicroservices.pdf
None