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Microservices in Practice
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Jano González
October 24, 2014
Technology
7
630
Microservices in Practice
My talk at RubyConf Argentina 2014
Jano González
October 24, 2014
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Transcript
None
@janogonzalez MICROSERVICES IN PRACTICE
LAST YEAR…
None
Leandro “Inkel” López, 2013 “El ordenador, ordena. La computadora, computa”
˝
12hrs AUDIO/min
HUNDREDS OF MILLIONS users/month
MANY PLATFORMS
$ rails soundcloud
The Mothership
Pearl Jam - Do the Evolution “It’s evolution, baby!” ˝
soundcloud.com iOS/Android 3rd party Public API Domain logic The Mothership
None
WELCOME TO THE MONOLITH Population: you
CONWAY’S LAW
Marvin Conway, 1968 “Organizations produce systems whose design is a
copy of the structure of the organization”
BREAKING THE MONOLITH ˝
MICROSERVICES ARCHITECTURE
JUST SOA FOR HIPSTERS?
CROSS FUNCTIONAL TEAMS ˝
None
None
BOUNDED CONTEXTS ˝
Track User Favoriting
DOMAIN MODEL FITS IN YOUR HEAD ˝
Track Likes Count Favoriting
YOU CAN USE THE RIGHT TOOLS ˝
FASTERS TESTS ˝
ENABLES REPLACEABILITY ˝
None
CONTINUOUS DEPLOYMENT ˝
SOA WITHOUT VENDOR LOCK-IN?
SMART COMPONENTS, DUMB PIPES ˝
HC SVNT DRACONES ˝
YOU CAN USE TOO MANY TOOLS ˝
DUPLICATED EFFORTS ˝
AVAILABILITY VS CONSISTENCY ˝
CASCADING FAILURES ˝
None
None
None
None
TOO MANY NETWORK CALLS ˝
None
YOU HAVE NETWORK CALLS ˝
L. Peter Deutsch - Ten Fallacies of Distributed Computing “The
network is reliable”
WHO CALLS WHO AGAIN?
OUR MIGRATION TO MICROSERVICES
SAY NO TO THE BIG-BANG ˝
EXTRACT WHEN MODIFYING ˝
Client Apps Public API Domain logic The Mothership Microservice Internal
API (bounded context)
DE-ACTIVE RECORD ˝
def index likes = user_likes_service.public_track_likes( @user, pagination_params) ! respond collection_for(likes)
end
USE FEATURE FLAGS ˝
if $feature.active?(:use_likes_service, current_user) … else … end
CREATE YOUR SERVICE ˝
MONITOR YOUR SERVICE ˝
PREVENT CASCADING FAILURES ˝
None
CIRCUIT BREAKERS ˝
None
X X X
X X X
X X
USE LIFECYCLE EVENTS ˝
Public API Domain logic The Mothership Microservice Internal API Events
Broker
EVENTUAL CONSISTENCY ˝
Microservice Microservice Client b1:(p,q,r), b2:(/) (a1;b1),(a1;b2)
DEFINE AUTHORITATIVE SOURCES ˝
DEFINE SYSTEM ROLES ˝
Microservice Microservice Client b1:(p,q,r), b2:(/) (a1;b1),(a1;b2)
Listing system Entity System Client b1:(p,q,r), b2:(/) (a1;b1),(a1;b2)
REDUCE “CHATTINESS” ˝
ONE SIZE DOESN’T FIT ALL ˝
CLIENT SPECIFIC APIs ˝
BFF ˝
Listing system Entity System Entity System Client specific API
Listing system Entity System Entity System Client specific API (a1;b1),(a1;b2)
Listing system Entity System Entity System Client specific API a1:(x,y,z)
b1:(p,q,r), b2:(/)
Listing system Entity System Entity System Client specific API (a1.x,
a1.y, b1.p)
EXTRACTING LIBRARIES ˝
COMING SOON…
DISTRIBUTED TRACING ˝
MORE TOLERANT READERS ˝
BINARY PROTOCOLS? ˝
CONCLUSIONS
SMALL FOCUSED TEAMS ˝
DELIVERING FAST ˝
BEWARE OF LOSING THE BIG PICTURE ˝
BEWARE OF TOO MANY STACKS ˝
BEWARE OF DUPLICATE EFFORTS ˝
AVOID BIG-BANG MIGRATIONS ˝
EXPECT DISTRIBUTED FAILURE ˝
MONITOR ALL THE SERVICES ˝
MICROSERVICES WORK FOR US, BUT…
NO SILVER BULLET ˝
THANK YOU jano@soundcloud.com http://soundcloud.com/jobs
(WE ARE HIRING) jano@soundcloud.com http://soundcloud.com/jobs
•https://www.flickr.com/photos/rubyconfar/11231906253/in/set-72157638113568114 •"Gilbert Hill, Andheri" by Madhav Pai - originally posted
to Flickr as Gilbert Hill, Andheri. Licensed under Creative Commons Attribution 2.0 via Wikimedia Commons - http://commons.wikimedia.org/wiki/ File:Gilbert_Hill,_Andheri.jpg#mediaviewer/File:Gilbert_Hill,_Andheri.jpg