Spring Boot集成redis集群拓扑动态刷新

项目场景：

Spring Boot集成Redis集群，使用lettuce连接Cluster集群实例。

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问题描述

redis其中一个节点挂了之后，springboot集成redis集群配置信息没有及时刷新，出现读取操作报错。

java.lang.IllegalArgumentException: Connection to 127.0.0.1:6379 not allowed. This connection point is not known in the cluster view
exceptionStackTrace
io.lettuce.core.cluster.PooledClusterConnectionProvider.getConnectionAsync(PooledClusterConnectionProvider.java:359)
io.lettuce.core.cluster.ClusterDistributionChannelWriter.write(ClusterDistributionChannelWriter.java:93)
io.lettuce.core.cluster.ClusterCommand.complete(ClusterCommand.java:56)
io.lettuce.core.protocol.CommandHandler.decode(CommandHandler.java:563)
io.lettuce.core.protocol.CommandHandler.channelRead(CommandHandler.java:516)

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原因分析：

lettuce默认是没有开始拓扑更新及读写分离导致的

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解决方案：

这里分为几种情况：

1. springboot 1.x之前版本默认使用jedis，无需要手动开启刷新
2. springboot 2.x默认为Lettuce，需要代码设置开启刷新节点拓扑策略
3. springboot 2.3.0开始，支持集群拓扑刷新功能，属性配置开启即可

第一种情况：springboot1.x版本环境

springboot1.x之前版本默认使用jedis，无需手动开启动态刷新。

第二种情况：springboot2.0~2.3版本环境

springboot2.0-2.3版本默认使用lettuce，默认不支持属性配置集群拓扑刷新。使用lettuce，需要增加配置类，需要手动开启刷新。

 配置类如下：

package com.test.config;

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
import io.lettuce.core.cluster.ClusterClientOptions;
import io.lettuce.core.cluster.ClusterTopologyRefreshOptions;
import lombok.extern.java.Log;
import org.apache.commons.pool2.impl.GenericObjectPoolConfig;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.data.redis.RedisProperties;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.cache.interceptor.KeyGenerator;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.RedisClusterConfiguration;
import org.springframework.data.redis.connection.RedisStandaloneConfiguration;
import org.springframework.data.redis.connection.lettuce.LettuceClientConfiguration;
import org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory;
import org.springframework.data.redis.connection.lettuce.LettucePoolingClientConfiguration;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.RedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;

import java.lang.reflect.Method;
import java.time.Duration;


@Log
@Configuration
@EnableCaching // 开启缓存支持
public class RedisConfig {

    @Autowired
    private RedisProperties redisProperties;

    @Bean(destroyMethod = "destroy")	//销毁这个bean之前调用这个destroy回调方法释放资源
    public LettuceConnectionFactory redisConnectionFactory() {
        // redis单节点
        if (null == redisProperties.getCluster() || null == redisProperties.getCluster().getNodes()) {
            RedisStandaloneConfiguration configuration = new RedisStandaloneConfiguration(redisProperties.getHost(),
                redisProperties.getPort());
            configuration.setPassword(redisProperties.getPassword());	//RedisPassword.of(redisProperties.getPassword())
			configuration.setDatabase(redisProperties.getDatabase());
            return new LettuceConnectionFactory(configuration);
        }

        // redis集群
        RedisClusterConfiguration redisClusterConfiguration = new RedisClusterConfiguration(redisProperties.getCluster().getNodes());
        redisClusterConfiguration.setPassword(redisProperties.getPassword());	//RedisPassword.of(redisProperties.getPassword())
        redisClusterConfiguration.setMaxRedirects(redisProperties.getCluster().getMaxRedirects());

        GenericObjectPoolConfig genericObjectPoolConfig = new GenericObjectPoolConfig();
        genericObjectPoolConfig.setMaxTotal(redisProperties.getLettuce().getPool().getMaxActive());
        genericObjectPoolConfig.setMaxIdle(redisProperties.getLettuce().getPool().getMaxIdle());
        genericObjectPoolConfig.setMinIdle(redisProperties.getLettuce().getPool().getMinIdle());
        genericObjectPoolConfig.setMaxWaitMillis(redisProperties.getLettuce().getPool().getMaxWait().getSeconds());

        // 支持自适应集群拓扑刷新和动态刷新源
        ClusterTopologyRefreshOptions clusterTopologyRefreshOptions = ClusterTopologyRefreshOptions.builder()
            .enableAllAdaptiveRefreshTriggers()
            // 开启自适应刷新
            .enableAdaptiveRefreshTrigger()
            // 开启定时刷新
            .enablePeriodicRefresh(Duration.ofSeconds(5))
            .build();

        ClusterClientOptions clusterClientOptions = ClusterClientOptions.builder()
            .topologyRefreshOptions(clusterTopologyRefreshOptions).build();

        LettuceClientConfiguration lettuceClientConfiguration = LettucePoolingClientConfiguration.builder()
            .poolConfig(genericObjectPoolConfig)	//如果使用默认配置可以注释genericObjectPoolConfig
//            .readFrom(ReadFrom.SLAVE_PREFERRED)  //读写分离：主写从读模式配置
            .clientOptions(clusterClientOptions).build();

        LettuceConnectionFactory lettuceConnectionFactory = new LettuceConnectionFactory(redisClusterConfiguration, lettuceClientConfiguration);
        lettuceConnectionFactory.setShareNativeConnection(false);// 是否允许多个线程操作共用同一个缓存连接，默认 true，false 时每个操作都将开辟新的连接
        lettuceConnectionFactory.resetConnection();// 重置底层共享连接, 在接下来的访问时初始化
        return lettuceConnectionFactory;
    }

    /**
     * RedisTemplate配置
     */
    @Bean
    public RedisTemplate redisTemplate(LettuceConnectionFactory factory) {
        RedisTemplate redisTemplate = new RedisTemplate<>();
        redisTemplate.setConnectionFactory(factory);

        // 使用注解@Bean返回RedisTemplate的时候，同时配置hashkey和hashValue的序列虎方式
        // key采用String的序列化方式
        redisTemplate.setKeySerializer(keySerializer());
        // value使用jackson序列化方式
        redisTemplate.setValueSerializer(valueSerializer());

        // hash的key采用String的序列化方式
        redisTemplate.setHashKeySerializer(keySerializer());
        // hash的value使用jackson序列化方式
        redisTemplate.setHashValueSerializer(valueSerializer());

        /**必须执行这个函数,初始化RedisTemplate*/
        // 需要先调用afterPropertiesSet方法,此方法是应该是初始化参数和初始化工作。
        redisTemplate.afterPropertiesSet();
        log.info("序列化完成！");
        return redisTemplate;
    }




    @Bean
    public KeyGenerator keyGenerator() {
        return new KeyGenerator() {
            @Override
            public Object generate(Object target, Method method, Object... params) {
                StringBuffer sb = new StringBuffer();
                sb.append(target.getClass().getName());
                sb.append(method.getName());
                for (Object obj : params) {
                    sb.append(obj.toString());
                }
                return sb.toString();
            }
        };
    }



    /**
     * key键序列化方式
     *
     * @return RedisSerializer
     */
    private RedisSerializer keySerializer() {
        return new StringRedisSerializer();
    }


    /**
     * value值序列化方式
     *
     * @return
     */
    private Jackson2JsonRedisSerializer valueSerializer() {
        Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
        ObjectMapper om = new ObjectMapper();
        om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
        jackson2JsonRedisSerializer.setObjectMapper(om);
        return jackson2JsonRedisSerializer;
    }
}

配置文件：

#Redis Configuration
spring.redis.cluster.max-redirects=10
spring.redis.cluster.nodes=127.0.0.1:8001,127.0.0.1:8002
spring.redis.timeout=60000ms
spring.redis.password=
spring.redis.lettuce.pool.max-active=10
spring.redis.lettuce.pool.max-idle=8
spring.redis.lettuce.pool.min-idle=0
spring.redis.lettuce.pool.max-wait=-1ms

 注意：注入LettuceConnectionFactory后，一定要记得注入RedisTemplate，并 redisTemplate.setConnectionFactory(factory);

apache commons-pool2 包提供了一个通用的对象池技术的实现。可以很方便的基于它来实现自己的对象池，比如 DBCP 和 Jedis 他们的内部对象池的实现就是依赖于 commons-pool2 。

    org.apache.commons
    commons-pool2
    2.8.0

第三种情况：springboot2.3之后版本环境

springboot2.3之后版本默认使用lettuce，默认支持属性配置开启集群拓扑刷新，其解决方案：属性配置开启即可。

spring.redis.lettuce.cluster.refresh.adaptive= true
spring.redis.lettuce.cluster.refresh.period=30000    # 30秒自动刷新一次

 

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