21. Spring cloud ribbon configuration details? Java version of spring cloud + springboot + uniapp + Vue B2B2C micro Service Mall micro service e-commerce live delivery source code

Springcloud Cloud Architecture 2021-04-16 18:20:57
spring cloud ribbon configuration details


In this section we will focus on the introduction Ribbon Some common configurations and configurations of  Ribbon Two ways .

Common configuration

1. Ban Eureka

When we're in RestTemplate Add @LoadBalanced After the note , You can call the interface with the service name , When there are multiple services , And load balancing .

This is because Eureka The service information in has been pulled to the local client , If we don't want to be with Eureka Integrate , It can be disabled by the following configuration method .

# Ban Eureka
ribbon.eureka.enabled=false

When we disable Eureka after , You can't use the service name to call the interface , Service address must be specified .

2. Configure interface address list

As mentioned above, it can be disabled Eureka, After disabled, you need to manually configure the service address to be called , The configuration is as follows :

# Ban Eureka After that, manually configure the service address
ribbon-config-demo.ribbon.listOfServers=localhost:8081,localhost:8083

This configuration is service specific , The prefix is the service name , After configuration, you can use the service name to call the interface as before .

3. Configure load balancing strategy

Ribbon The default policy is polling , You can see from the output of the example we explained earlier ,Ribbon There are a lot of strategies available in , This will be explained later . Through configuration, we can specify which policy the service will use for load operation .

4. Timeout time

Ribbon There are two time related settings in , They are the timeout of request connection and the timeout of request processing , The rules are as follows :

# Timeout for a request connection 
ribbon.ConnectTimeout=2000
# Timeout for request processing 
ribbon.ReadTimeout=5000
 Or for each Ribbon Clients set different timeouts ,  Specified by service name :
ribbon-config-demo.ribbon.ConnectTimeout=2000
ribbon-config-demo.ribbon.ReadTimeout=5000

5. Concurrent parameters

# maximum connection 
ribbon.MaxTotalConnections=500
# Every host maximum connection 
ribbon.MaxConnectionsPerHost=500

Code configuration Ribbon

To configure Ribbon The simplest way is through configuration files . Of course, we can also configure it by code .

Configure the previously defined load policy through code , First, you need to create a configuration class , Initialize the custom policy , The code is as follows .

@Configuration
public class BeanConfiguration {
@Bean
public MyRule rule() {
return new MyRule();
}
}

Create a Ribbon Configuration class of client , relation BeanConfiguration, use name To specify the name of the service to be called , The code is as follows .

@RibbonClient(name = "ribbon-config-demo", configuration = BeanConfiguration.class)
public class RibbonClientConfig {
}

You can remove the policy configuration from the previous configuration file , Then restart the service , Access the interface to see the same effect as before .

Configuration file mode configuration Ribbon

In addition to using code to Ribbon Configuration of , We can also configure files for Ribbon Specify the corresponding configuration :

<clientName>.ribbon.NFLoadBalancerClassName: Should implement ILoadBalancer( Load balancer operation interface )
<clientName>.ribbon.NFLoadBalancerRuleClassName: Should implement IRule( Load balancing algorithm )
<clientName>.ribbon.NFLoadBalancerPingClassName: Should implement IPing( Service availability check )
<clientName>.ribbon.NIWSServerListClassName: Should implement ServerList( Get service list )
<clientName>.ribbon.NIWSServerListFilterClassName: Should implement ServerList­Filter( Filtering of service list )

Retry mechanism

In a clustered environment , Using multiple nodes to provide services , It is inevitable that a node will fail . use Nginx When doing load balancing , If your app is stateless 、 You can scroll through , That is, you need one to restart the application , In fact, the impact on users is relatively small , because Nginx If the forwarding request fails, it will be forwarded to another instance again .

because Eureka Is based on AP Principle based , At the expense of data consistency , Every Eureka The service will save the registered service information , When the registered client and Eureka When you can't keep your heart beating , It could be the Internet , Or maybe the service is down .

under these circumstances ,Eureka The registration information will be saved for a period of time . At this time, the client may get the service information that has been hung up , so Ribbon It's possible to get the service information that has failed , This will result in a failed request .

This kind of problem can be avoided by using the retrial mechanism . The retrial mechanism is when Ribbon When the requested service is found unreachable , Re request another service .

1. RetryRule retry

Solve the above problems , The easiest way is to use Ribbon The built-in retrying policy can be used for retrying , At this time, you only need to specify the load policy of a service as the retry policy :

ribbon-config-demo.ribbon.NFLoadBalancerRuleClassName=com.netflix.loadbalancer.RetryRule

2. Spring Retry retry

Besides using Ribbon The built-in retrying strategy , We can also integrate Spring Retry To try again .

stay pom.xml Add Spring Retry Dependence , The code is as follows .

<dependency>
<groupId>org.springframework.retry</groupId>
<artifactId>spring-retry</artifactId>
</dependency>

Configure the number of retries and other information :

# Number of retries to the current instance 
ribbon.maxAutoRetries=1
# Number of retries to switch instances 
ribbon.maxAutoRetriesNextServer=3
# Retry all operation requests 
ribbon.okToRetryOnAllOperations=true
# Yes Http Response code to try again 
ribbon.retryableStatusCodes=500,404,502

Recommended cloth type Micro service provider

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https://javamana.com/2021/04/20210416163237064j.html

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