(posted) comparison of Eureka, consumer and Nacos 1

eureka、consul、nacos The main function is to provide the service of Registration Center , The latter two also have the function of configuration center ;

What is a registry ？

The registry was created to decouple service providers (Provider) With consumers （Consumer） The relationship between , Distributed design architecture , The number of service providers is not dynamic , In traditional static LB The scheme , Unable to perceive this change well ;

In the microservice architecture, the registry can be said to be a service relationship ” Mail list “, It records the mapping relationship between service and service address . In a distributed architecture , Services will register here , When a service needs to call another service , Just find the address of the service here , To call .

The registry mainly provides two important functions ： Service registration 、 Service discovery .

What problems can a registry help us solve ？

In a distributed architecture , In addition to considering the relationship between service providers and consumers , We should also consider how to solve a series of more complex problems ：

1. After the service provider registers , How to be discovered in time ;
2. After a service outage , How to go offline in time ;
3. When the service call is abnormal , How to effectively avoid the avalanche problem ;
4. In high traffic 、 Under great pressure , How to carry out effective horizontal expansion ;
5. How does the registry achieve its own high availability ;

eureka、consul、nacos contrast

	eureka	consul	nacos
Integrated intrusion	Integrated within the application	Hardly any	Hardly any
CAP	AP	CP Consistency led to elections Leader The whole period consul Unavailable	CP+AP
Version of the iteration	no	yes	yes
Configuration center	no	yes	yes , accord with Spring boot Development specifications for , Support dynamic refresh
access protocol	http	http/dns	http/dns/udp
Integration support	spring cloud	spring cloud/k8s	spring cloud/k8s/dubbo
How well you can handle it	Easy to	More complicated	Very easy , Chinese document
Avalanche protection	I won't support it	I won't support it	Support