Today we are talking about Springcloud the fourth component - manure, not, Feign.
| What Feign that? |
Feign effect of:
(1) is a declarative, template-based HTTP client that can help us more quickly and gracefully invoke HTTP API.
(2) and which is capable of integrating Ribbon Hystrix.
- Ribbon: implementation of the client load balancing service calls
- Hystrix: through the circuit breaker to protect the micro-service applications
| Ribbon Configuration |
Feign client load balancing is achieved through the Ribbon, so we can directly define the parameters of the various service client calls by configuring the client Ribbon way.
Related
//全局配置
ribbon.ConnectTimeout=500
ribbon.ReadTimeout=5000
//指定服务配置
HELLO-SERVICE.ribbon.ConnectTimeout=500
HELLO-SERVICE.ribbon.ReadTimeout=5000
HELLO-SERVICE.ribbon.OkToRetryOnAllOperations=true
HELLO-SERVICE.ribbon.MaxAutoRetriesNextServer=2
HELLO-SERVICE.ribbon.MaxAutoRetries=1
Retry mechanism
Feign and Ribbon, there are also the default retry mechanism request.
| Hystrix arrangement |
By default, Feign Feign clients will all methods are encapsulated in order to carry out Hystrix service protection.
Related
//设置全局的超时时间
Hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds=5000
// 全局关闭Hystrix功能
feign.hystrix.enabled=false
// 对某个服务客户端进行关闭
@Scope（“prototype”）
Service downgraded configuration
(1) preparation of the interface is defined Feign client interface a specific category
(2) in the service binding interface to specify the implementation class corresponding to the service degradation by @FeignClient (fallback = xxx)
| Other configurations |
Compression request
Request and response GZIP compression to reduce performance losses during communication. parameter settings:
feign.compression.request.enabled=true
feign.compression.response.enabled=true
Logging Configuration
(1) open:
logging.level.com.didispace.web.HelloService=DEBUG
(2) the non-object definition Logger.Level none level.
- none: No information is logged
- basic: Only requests recording method, URL, and the response status code and execution time
- headers: also the head of the information request and response
- full: record details of all requests and responses, including header information, request body, metadata, etc.
| summary |
Note that, the Ribbon "time out" and Hystrix the "time out" different, Ribbon after a timeout, it will retry after a timeout Hystrix will be blown. So Hystrix timeout should be greater than the timeout Ribbon.
