MicroServices : common characteristics

- Automated Deployment

- Componentization via Services : 
-- component is a unit of software that is independently replaceable and upgradeable.
-- A service may consist of multiple processes that will always be developed and deployed together
-- services are independently deployable.
-- Microservices have their own domain logic

- Organized around Business Capabilities
-- No 3-tier

- Products not Projects

- Smart endpoints and dumb pipes
-- microservices aim to be as decoupled and as cohesive as possible
-- Microservices receiving a request, applying logic as appropriate and prois ducing a response
-- No Enterprise Service Bus (ESB), with sophisticated facilities for message routing, choreography, transformation, and applying business rules.

- Decentralized Governance
-- difference component, different langugae
-- Patterns: Tolerant Reader and Consumer-Driven Contracts

- Decentralized Data Management
-- Domain-Driven Design DDD divides a complex domain up into multiple bounded contexts and maps out the relationships between them.
-- Polyglot Persistence : Each service owns its database
-- Results in simpler upgrade of application. 
1. User sessions : Redis
2. Financial Data and Reporting : RDBMS
3. Shopping Cart : Riak
4. Recommendation : Neo4j
5. Product Catalog : MongoDB
6. Analytics and User activity logs : Cassandra

- Infrastructure Automation
-- CI/CD Pipeline

- Design for failure
-- The application should able to tolerate the failure of services
-- Real time monitoring (of circuit breaker status, current throughput and latency) and auto restore of services.

- Evolutionary Design
-- How to divide monolith : 
1. The key property of a component: independent replacement and upgradeability
2. drive modularity through the pattern of change: Most frequent changed code should be in one service. Least frequent changed, stable code in another service. The modules often changed to gather should be merged in single service. 
-- Avoid using versing of services
-- Example The Guardian website



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