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HOW TO DISASSEMBLE A MONOLITHIC APP IN
(NOT-SO)MICRO-SERVICES
Turin - 17 november 2015
MICHELE FRANZIN
@REALFUZZY
PARTNERS
8000TRANSACTIONS/MONTH
in just an hour
DISCLAIMER
my personal opinion
people have different experiences
ideas, comment, etc contact me @realfuzzy
subject is wide, so I’d love to hear your thoughts :-)
It’s not a code talk (but I’ll show you some code)
AGENDA: THERE’S NO AGENDA
I’ve got a tale instead
BUAHAHAHAHA! I AM THE
MONOLITH! COME TO THE
WORLD TO BRING IMMOBILISM AND
COMPLEXITY!
MONOLITHIC MICROSERVICE
architecture is the keyword
ARCHITECTURE ARCHITECTURE
THE MONOLITH
THE (SOMETIMES EVIL) MONOLITH http
://w
ww.
infoq
.com
/art
icles
/micr
oser
vices
-intro
✓simple to develop
✓IDEs & development tools support
✓easy to test
✓simple to deploy
✓works well for relatively small apps
- growth overloads everything
- difficult to adopt new technologies
- often stuck with the starting choices
- doesn’t scale to long-lived-application
#MICROSERVICESEARCH TREND
WHAT’S A MICROSERVICE• suite of small services• running in its own process• communicating with lightweight mechanisms• built around business capabilities • independently automated deployable • minimum of centralized management• technology agnostic
http
://blo
g.aru
ngup
ta.m
e/m
onol
ithic-
micr
oser
vices
-refac
torin
g-jav
aee-
appl
icatio
ns/
✓each microservice is relatively small
✓easier for a developer to understand
✓easier to scale development
✓improve fault isolation
✓develop and deploy independently
✓no long-term commitment to a tech-stack
✓allow a fine-grained performance tuning or scaling
- additional complexity of a distributed system
- tools/IDEs are monolithic applications oriented
- testing is more difficult
- must implement the inter-service communication
- increase memory consumption
THE NEWBEGINNING
http
s://u
ploa
d.wiki
med
ia.or
g/w
ikipe
dia/
com
mon
s/6/6
7/Ch
ange
_In_
Han
d.jpg
GOALS
‣ time
‣ budget
‣ shit (can) happens
‣ ship
AGENDA*
✓what’s a microservice?
• why have I to jump in ?
• where I can start from ?
• how I should be aware of ?
* I know, I know, I lied about the agenda
Sir. Tools
A warrior that can use every kind of tool as a weapon
Strateky Sensei
Master renowned for its strategic and
tactical ability
Workodoo Master
The work-force is strong with this one
HAHAHAHA!YOUR EFFORTS
ARE NOT ENOUGH TO DEFEAT ME!
Your efforts have little effect! an orthogonal approach might
help you ...
Q0: HOW TO DECOMPOSE A MONOLITH?
1. Identify business boundaries
2. start decomposing each into own microservice
3. follow the Single Responsibility Principle
4. goto :2
…MANY SERVICES THAT COMMUNICATE ?
http
://w
ww.
rapt
orsre
publi
c.com
/
ASYNC MESSAGING
XP
S2
S1
CHOOSE WISELY
• Reliability
• Routing algorithms
• Highly Availability
• Supported protocols
MESSAGE BUS
XP1
S2
S1
P2
S3
OUR CHOICE ☛ RABBITMQ
• AMPQ message broker
• Erlang
• Fast, reliable, secure
• Many clients
• Commercial support
SPECIFICATION IS A MUST HAVE
(no matter what)
DESIGN FOR FAILUREaka: communicate when communication is hard
CIRCUIT BREAKER http
s://w
ww.
flickr.
com
/pho
tos/l
eafb
ug/4
0995
0515
/
http
://m
artin
fow
ler.co
m/b
liki/C
ircuit
Brea
ker.h
tml
SLIM FIT
circuit_breaker https://github.com/wsargent/circuit_breaker
breaker_box https://github.com/sittercity/breaker_box
CB2 https://github.com/pedro/cb2
S
M
L
–Giovanni Mela
“Inserisci qui una citazione”.9XL
– Martin Fowler, Chief Scientist - ThoughtWorks
“…don’t even consider microservices unless you have a system that's too complex to manage as a monolith”
YAGNIdo monolith first
monolith
microservice
complexity
prod
uctiv
ity
http
://m
artin
fow
ler.co
m/b
liki/M
icros
ervic
ePre
mium
.htm
l
CONTINUOUS DEPLOYMENT FOR RUBY GEMS
–Giovanni Mela
“Inserisci qui una citazione”.
– Melvin Conway, 1968
“organizations which design systems … are constrained to produce designs
which are copies of the communication structures of these organizations”
THE INVERSE CONWAY MANEUVER
– Martin Fowler, Chief Scientist - ThoughtWorks
“For many people throwing away a code base is a sign of failure, perhaps
understandable …, but still failure.”
SACRIFICIAL ARCHITECTURE
http:/
/www
.card
hub.c
om/ed
u/cre
dit-ca
rds-e
xpira
tion-d
ate
POLYGLOT IS NICEbut mother tongue is fair enough
DEVOPS!no devops?!? no party.
https://www.flickr.com/photos/91657289@N02/10218392744
The Smith
Master craftsman expert in forging
anything
The Sculptor
An artist able to give shape to
magnificent works
The Painter
Colors and shapes come to life on her
canvas!
NO MONOLITHS WERE HARMED IN THE MAKINGOF THIS PRESENTATION
TAKEAWAYS
• go monolith first
• communication (all-around) is strategic assets
• start simple, don’t fear the change
• take decisions. I-really-mean-that.
…WHAT’S NEXT ?• testing
• CQRS + ES
• log analisys & monitoring
• metrics
• …
Thank you.
@realfuzzyMichele Franzin
