Redis集群Lettuce主從切換問題解決方案

更新時間：2023年07月09日 11:42:06 作者：AC編程

這篇文章主要為大家介紹了Redis集群Lettuce主從切換問題解決方案，有需要的朋友可以借鑒參考下，希望能夠有所幫助，祝大家多多進步，早日升職加薪

一、問題描述

Redis Cluster集群，當master宕機，主從切換，客戶端報錯 timed out

二、原因

SpringBoot2.X版本開始Redis默認的連接池都是采用的Lettuce。當節(jié)點發(fā)生改變后，Letture默認是不會刷新節(jié)點拓撲的。

三、解決方案

3.1 方案一：把lettuce換成jedis

只需要在pom.xml里調整一下依賴的引用

      <dependency>
           <groupId>org.springframework.boot</groupId>
           <artifactId>spring-boot-starter-data-redis</artifactId>
           <version>2.1.5.RELEASE</version>
               <!-- 不用lettuce ,用jedis -->
               <exclusions>
                   <exclusion>
                       <groupId>io.lettuce</groupId>
                       <artifactId>lettuce-core</artifactId>
                   </exclusion>
               </exclusions>
       </dependency>
       <dependency>
           <groupId>redis.clients</groupId>
           <artifactId>jedis</artifactId>
           <version>3.1.0-m4</version>
       </dependency>

3.2 方案二：刷新節(jié)點拓撲視圖

Redis節(jié)點異常，服務端的Redis集群拓撲被刷新了，Java程序沒有獲取到新的拓撲。

Lettuce官方文檔中關于Redis Cluster的相關說明：Lettuce處理Moved和Ask永久重定向，由于命令重定向，你必須刷新節(jié)點拓撲視圖。而自適應拓撲刷新（Adaptive updates）與定時拓撲刷新（Periodic updates）是默認關閉的，可以通過如下代碼打開。

https://github.com/lettuce-io/lettuce-core/wiki/Redis-Cluster#user-content-refreshing-the-cluster-topology-view

修改代碼如下

package com.montnets.common.redis;
import io.lettuce.core.ClientOptions;
import io.lettuce.core.cluster.ClusterClientOptions;
import io.lettuce.core.cluster.ClusterTopologyRefreshOptions;
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.context.annotation.Bean;
import org.springframework.data.redis.connection.RedisClusterConfiguration;
import org.springframework.data.redis.connection.RedisNode;
import org.springframework.data.redis.connection.RedisPassword;
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.stereotype.Component;
import java.time.Duration;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
@Component
public class RedisPoolConfig {
    @Autowired
    private RedisProperties redisProperties;
    public GenericObjectPoolConfig<?> genericObjectPoolConfig(RedisProperties.Pool properties) {
        GenericObjectPoolConfig<?> config = new GenericObjectPoolConfig<>();
        config.setMaxTotal(properties.getMaxActive());
        config.setMaxIdle(properties.getMaxIdle());
        config.setMinIdle(properties.getMinIdle());
        if (properties.getTimeBetweenEvictionRuns() != null) {
            config.setTimeBetweenEvictionRunsMillis(properties.getTimeBetweenEvictionRuns().toMillis());
        }
        if (properties.getMaxWait() != null) {
            config.setMaxWaitMillis(properties.getMaxWait().toMillis());
        }
        return config;
    }
    @Bean(destroyMethod = "destroy")
    public LettuceConnectionFactory lettuceConnectionFactory() {
        //開啟 自適應集群拓撲刷新和周期拓撲刷新
        ClusterTopologyRefreshOptions clusterTopologyRefreshOptions =  ClusterTopologyRefreshOptions.builder()
                // 開啟全部自適應刷新
                .enableAllAdaptiveRefreshTriggers() // 開啟自適應刷新,自適應刷新不開啟,Redis集群變更時將會導致連接異常
                // 自適應刷新超時時間(默認30秒)
                .adaptiveRefreshTriggersTimeout(Duration.ofSeconds(30)) //默認關閉開啟后時間為30秒
                // 開周期刷新
                .enablePeriodicRefresh(Duration.ofSeconds(20))  // 默認關閉開啟后時間為60秒 ClusterTopologyRefreshOptions.DEFAULT_REFRESH_PERIOD 60  .enablePeriodicRefresh(Duration.ofSeconds(2)) = .enablePeriodicRefresh().refreshPeriod(Duration.ofSeconds(2))
                .build();
        // https://github.com/lettuce-io/lettuce-core/wiki/Client-Options
        ClientOptions clientOptions = ClusterClientOptions.builder()
                .topologyRefreshOptions(clusterTopologyRefreshOptions)
                .build();
        LettuceClientConfiguration clientConfig = LettucePoolingClientConfiguration.builder()
                .poolConfig(genericObjectPoolConfig(redisProperties.getJedis().getPool()))
                //.readFrom(ReadFrom.MASTER_PREFERRED)
                .clientOptions(clientOptions)
                .commandTimeout(redisProperties.getTimeout()) //默認RedisURI.DEFAULT_TIMEOUT 60
                .build();
        List<String> clusterNodes = redisProperties.getCluster().getNodes();
        Set<RedisNode> nodes = new HashSet<RedisNode>();
        clusterNodes.forEach(address -> nodes.add(new RedisNode(address.split(":")[0].trim(), Integer.valueOf(address.split(":")[1]))));
        RedisClusterConfiguration clusterConfiguration = new RedisClusterConfiguration();
        clusterConfiguration.setClusterNodes(nodes);
        clusterConfiguration.setPassword(RedisPassword.of(redisProperties.getPassword()));
        clusterConfiguration.setMaxRedirects(redisProperties.getCluster().getMaxRedirects());
        LettuceConnectionFactory lettuceConnectionFactory = new LettuceConnectionFactory(clusterConfiguration, clientConfig);
        // lettuceConnectionFactory.setShareNativeConnection(false); //是否允許多個線程操作共用同一個緩存連接，默認true，false時每個操作都將開辟新的連接
        // lettuceConnectionFactory.resetConnection(); // 重置底層共享連接, 在接下來的訪問時初始化
        return lettuceConnectionFactory;
    }
}

以上就是Redis集群Lettuce主從切換問題解決方案的詳細內(nèi)容，更多關于Redis集群Lettuce主從切換的資料請關注腳本之家其它相關文章！

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