[microservices] understanding microservices

Get to know microservices

Monomer architecture ： Develop all the functions of the business in one project , Deploy as a package .

** advantage ：** Simple architecture , Low deployment cost

** shortcoming ：** High coupling degree （ Difficult to maintain 、 Upgrading is difficult ）

Distributed architecture ： Split the system according to business functions , Each business function module is developed as an independent project , It's called a service .

** advantage ：** Reduce service coupling , It is conducive to service upgrading and expansion

** shortcoming ：** The service invocation relationship is complicated

Although distributed architecture reduces service coupling , However, there are many problems to consider when splitting Services ：

• How to define the granularity of service splitting ？
• How to realize remote call between services ？
• How to manage the invocation relationship of services ？
• How to perceive the health status of services ?
• How to maintain the service cluster address ?

People need to formulate a set of effective standards to restrict distributed architecture .

Microservices

Architectural features of microservices ：

• Single responsibility ： Microservices have smaller granularity , Each service corresponds to a unique business capability , Single responsibility
• autonomous ： Team independence 、 Technology independence 、 Data independence , Independent deployment and delivery
• Service oriented ： The service provides a unified standard interface , It has nothing to do with language and Technology
• Strong isolation ： Isolate service calls 、 Fault tolerance 、 Downgrade , Avoid cascading problems

The above features of microservices In fact, it is setting a standard for distributed architecture , Further reduce the coupling between services , Independence and flexibility in providing services . High cohesion , Low coupling .

therefore , It can be considered that microservice is a distributed architecture scheme with good architecture design .

Among them in Java The most striking thing in the field is SpringCloud The scheme provided .

Microservice structure

The solution of microservice needs a technical framework to implement , Internet companies around the world are actively trying their own microservice landing technology , The most famous in China is SpringCould Ali Dubbo

Microservice technology comparison

	Dobbo	springCloud	springCloudAlibaba
Registry Center	zookeeper,Redis	Eureka,Consul	Nacos,Eureka
Service remote invocation	Dubbo agreement	Feign(http agreement )	Dubbo,Feign
Configuration center	null	SpringCloudConfig	SpringCloudConfig,Nacos
The service gateway	null	SpringCloudGateway,Zuul	SpringCloudGateway,Zuul
Service monitoring and protection	dubbo-admin, Weak function	Hystrix	Sentinel