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Un monolith microservice ready – Orange Dev Tes...
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Arnaud LEMAIRE
October 16, 2018
Programming
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Un monolith microservice ready – Orange Dev Test Days 2018
Arnaud LEMAIRE
October 16, 2018
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Transcript
Monolith Microservices ready™ @Lilobase
Complexity is non-linear Complexity System size
Distributed doghouse
-Simon Brown « If you can’t build a monolith, what
makes you think micro-services are the answer ? »
Monolith Microservices -Alvaro Sanchez
-Melvin Conway « organizations which design systems ... are constrained
to produce designs which are copies of the communication structures of these organizations »
-Simon Brown
-Simon Brown
-Simon Brown 1 2
The problem has never been the monolith, but having a
single coupled model
Multiple models lives in your application Invoice Catalog Payment Product
Product Product This is not the same product
The primary coupling in software architecture is when concepts from
separate contexts are entangled
We usually don’t get our models right on the first
try. This is where having a single code base & deployment unit helps with the requested refactoring
Let’s create some hard boundaries
Domain domain interface concrete implementation of the domain interface technical
collaborator
Service A API Service B
Internal API Service A Service B External API Anti-Corruption Layer
(Belong to the infrastructure)
Facade Parent Injector S1 S2
Facade Parent Injector S1 HTTP connector
« Two micro services and their shared database » -Mathias
Verraes
Messages brokers are also datasources
-Cyrille Dupuydauby « Years of fight against ‘DB as a
MoM’ anti- pattern have finally paid off: I am now fighting against ‘MoM as a DB’ anti-pattern. »
Events are not created equal Invoice Catalog Payment Inventory
What about processes
Event or Command driven ? Agent Acteur
Orchestration or choreography ? Orchestration Choreography
Exemple of an event driven orchestrated pattern : the macdonald’s
pattern Counter Ice Cream Hamburgers Salads New Order —— —— —— New Order —— —— —— New Order —— —— ——
Counter Ice Cream Hamburgers Salads
Counter Ice Cream Hamburgers Salads Each time we receive an
item, we check if the order is complete New Order —— —— ——
A time bomb for the optimists
-Graham Lea « They can be hard to see, and
they can sink your app »
Dependencies, even more chances to get failures
Fault tolerance • Rate-limiter • Automatic retry with exponential backoff
• Response caching • BulkHead pattern • Circuit-breaker • Load Balancing Hystrix, Resilience4j
The micro services iceberg
Distributed transaction
Saga T1 T2 T3
Saga T1 T2 T3 C1 C3
Saga T1 T2 T3 T2 Idempotence
PC PC PC Two phases commits T T T
UI Driven Consistency
-Simon Brown
If you cannot deploy independently your services, you don’t have
a micro-service architecture
Going further • Applying the Saga Pattern • Caitie McCaffrey
• Distributed Transactions: The Icebergs of Microservices • Graham Lea • Application Resilience Engineering & Operations at Netflix • Ben Christensen • arpinum/alexandria-api