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Spring Boot中Redis Template集群配置的一个坑

在一个Spring boot项目中,需要使用redis作为缓存,于是将使用spring-boot-starter-data-redis,具体依赖如下:

<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-redis</artifactId>
			<version>2.0.4.RELEASE</version>
		</dependency>
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在测试环境中,功能测试,压力测试,都没有发现问题,原因是测试环境中redis自行搭建,没有设置密码,但是上线后,Redis使用的是Azure的Pass服务的集群,并设置密码,使用过程中发现如下问题:

com.lambdaworks.redis.RedisException: java.lang.IllegalArgumentException: Connection to XXX.XX.XXX.XXX:15000 not allowed. This connection point is not known in the cluster viewjava.lang.IllegalArgumentException: Connection to XXX.XX.XXX.XXX:15000 not allowed. This connection point is not known in the cluster viewConnection to XXX.XX.XXX.XXX:15000 not allowed. This connection point is not known in the cluster view

2 问题分析+解决方法

2.1 redis负载过高问题

2.1.1 问题原因

原本打算看一下是否是代码逻辑问题导致redis负载过高,于是登录redis服务器使用monitor命令观察命令执行的频率,发现每执行一次命令都执行一次 Auth password 命令,说明连接池未正确使用导致执行一次命令创建一次连接,导致负载高 ,并且代码执行效率低 。

2.1.2 解决方法

然后对比了使用JedisCluster的项目没有此类问题,因此怀疑是spring-boot-starter-data-redis的RedisTemplate的问题,查看源码后发现spring-data-redis的驱动包在某个版本之后替换为 Lettuce ,在启用集群后jedis的连接池无效。错误配置如下:

# 错误配置
# Redis配置
spring.redis.cluster.nodes=127.0.0.1:6379
### 连接超时时间(毫秒)
spring.redis.timeout=60000
spring.redis.password=xxxxxxx
# 连接池最大连接数(使用负值表示没有限制)
spring.redis.jedis.pool.max-active=8
##连接池最大阻塞等待时间,若使用负值表示没有限制
spring.redis.jedis.pool.max-wait=-1
##连接池中的最大空闲连接
spring.redis.jedis.pool.max-idle=8
# 连接池中的最小空闲连接
spring.redis.jedis.pool.min-idle=0
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需要改成正确的配置,修改之后无此现象,具体配置如下:

单机版:

# 单机版
# Redis配置
spring.redis.host=127.0.0.1
spring.redis.port=6379
### 连接超时时间(毫秒)
spring.redis.timeout=60000
spring.redis.password=xxxxxxx
# 连接池最大连接数(使用负值表示没有限制)
spring.redis.jedis.pool.max-active=8
##连接池最大阻塞等待时间,若使用负值表示没有限制
spring.redis.jedis.pool.max-wait=-1
##连接池中的最大空闲连接
spring.redis.jedis.pool.max-idle=8
# 连接池中的最小空闲连接
spring.redis.jedis.pool.min-idle=0
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集群版:

#集群版 
# Redis配置
spring.redis.cluster.nodes=127.0.0.1:6379
### 连接超时时间(毫秒)
spring.redis.timeout=60000
spring.redis.password=xxxxxxx
# 连接池最大连接数(使用负值表示没有限制)
spring.redis.lettuce.pool.max-active=8
##连接池最大阻塞等待时间,若使用负值表示没有限制
spring.redis.lettuce.pool.max-wait=-1
##连接池中的最大空闲连接
spring.redis.lettuce.pool.max-idle=8
# 连接池中的最小空闲连接
spring.redis.lettuce.pool.min-idle=0
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注意:启用集群版,需要额外添加如下依赖

<dependency>
			<groupId>org.apache.commons</groupId>
			<artifactId>commons-pool2</artifactId>
			<version>2.8.0</version>
		</dependency>
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2.2 redis异常 Connection to XXX.XX.XXX.XXX:15000 not allowed 问题

2.2.1 问题原因

网上搜索了一下,发现项目github上已有此问题的反馈以及解决办法 github.com/lettuce-io/… ,原因是由于Lettuce其中有个配置项 validateClusterNodeMembership 默认是true导致;

2.2.2 解决办法

由于spring boot未能直接通过配置文件直接修改此配置,因此需要自定义Redis配置,具体代码如下: MylettuceConnectionFactory.java

package com.quison.test.config;

import io.lettuce.core.AbstractRedisClient;
import io.lettuce.core.cluster.ClusterClientOptions;
import io.lettuce.core.cluster.ClusterTopologyRefreshOptions;
import io.lettuce.core.cluster.RedisClusterClient;
import org.springframework.beans.DirectFieldAccessor;
import org.springframework.data.redis.connection.RedisClusterConfiguration;
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 java.util.concurrent.TimeUnit;

public class MyLettuceConnectionFactory extends LettuceConnectionFactory {

    public MyLettuceConnectionFactory() { }

    public MyLettuceConnectionFactory(RedisClusterConfiguration redisClusterConfiguration, LettuceClientConfiguration lettuceClientConfiguration) {
        super(redisClusterConfiguration, lettuceClientConfiguration);
    }

    @Override
    public void afterPropertiesSet() {
        super.afterPropertiesSet();
        DirectFieldAccessor accessor = new DirectFieldAccessor(this);
        AbstractRedisClient client = (AbstractRedisClient) accessor.getPropertyValue("client");
        if(client instanceof RedisClusterClient){
            RedisClusterClient clusterClient = (RedisClusterClient) client;
            ClusterTopologyRefreshOptions topologyRefreshOptions = ClusterTopologyRefreshOptions.builder()
                    .enablePeriodicRefresh(10, TimeUnit.MINUTES)
                    .enableAllAdaptiveRefreshTriggers()
                    .build();
            ClusterClientOptions clusterClientOptions = ClusterClientOptions.builder()
                     // 注意此配置项设置为false
                    .validateClusterNodeMembership(false)
                    .topologyRefreshOptions(topologyRefreshOptions)
                    .build();
            clusterClient.setOptions(clusterClientOptions);
        }
    }

}
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由于配置后,连接池也需要自行设置,因此Redis的配置文件修改为如下设置 RedisConfig.java

package com.quison.test.config;

import org.apache.commons.pool2.impl.GenericObjectPoolConfig;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.data.redis.RedisProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.data.redis.connection.*;
import org.springframework.data.redis.connection.lettuce.DefaultLettucePool;
import org.springframework.data.redis.connection.lettuce.LettuceClientConfiguration;
import org.springframework.data.redis.connection.lettuce.LettucePoolingClientConfiguration;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.RedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;

import java.time.Duration;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;

@Configuration
public class RedisConfig {


    @Value("${spring.redis.cluster.nodes}")
    private String clusterNodes;

    @Value("${spring.redis.password}")
    private String password;

    @Value("${spring.redis.lettuce.pool.max-idle}")
    private Integer maxIdle;

    @Value("${spring.redis.lettuce.pool.max-active}")
    private Integer maxActive;

    @Value("${spring.redis.cluster.max-redirects}")
    private Integer maxRedirects;


    @Bean
    public RedisConnectionFactory myRedisConnectionFactory() {

        RedisClusterConfiguration redisClusterConfiguration = new RedisClusterConfiguration();
        String[] serverArray = clusterNodes.split(",");
        Set<RedisNode> nodes = new HashSet<RedisNode>();
        for (String ipPort : serverArray) {
            String[] ipAndPort = ipPort.split(":");
            nodes.add(new RedisNode(ipAndPort[0].trim(), Integer.valueOf(ipAndPort[1])));
        }
        redisClusterConfiguration.setPassword(RedisPassword.of(password));
        redisClusterConfiguration.setClusterNodes(nodes);
        redisClusterConfiguration.setMaxRedirects(maxRedirects);


        GenericObjectPoolConfig genericObjectPoolConfig = new GenericObjectPoolConfig();
        genericObjectPoolConfig.setMaxIdle(maxIdle);
        genericObjectPoolConfig.setMinIdle(8);
        genericObjectPoolConfig.setMaxTotal(maxActive);
        genericObjectPoolConfig.setMaxWaitMillis(10000);

        LettuceClientConfiguration clientConfig = LettucePoolingClientConfiguration.builder()
                .commandTimeout(Duration.ofMillis(10000))
                .poolConfig(genericObjectPoolConfig)
                .build();


        return new MyLettuceConnectionFactory(redisClusterConfiguration, clientConfig);
    }


    /**
     * redis模板,存储关键字是字符串,值是Jdk序列化
     *
     * @param myRedisConnectionFactory
     * @return
     * @Description:
     */
    @Bean
    @ConditionalOnMissingBean(name = "redisTemplate")
    @Primary
    public RedisTemplate<?, ?> redisTemplate(RedisConnectionFactory myRedisConnectionFactory) {
        RedisTemplate<?, ?> redisTemplate = new RedisTemplate<>();
        redisTemplate.setConnectionFactory(myRedisConnectionFactory);
        //key序列化方式;但是如果方法上有Long等非String类型的话,会报类型转换错误;
        RedisSerializer<String> redisSerializer = new StringRedisSerializer();
        redisTemplate.setKeySerializer(redisSerializer);
        redisTemplate.setHashKeySerializer(redisSerializer);

        //默认使用JdkSerializationRedisSerializer序列化方式;会出现乱码,改成StringRedisSerializer
        StringRedisSerializer stringSerializer = new StringRedisSerializer();
        redisTemplate.setKeySerializer(stringSerializer);
        redisTemplate.setValueSerializer(stringSerializer);
        redisTemplate.setHashKeySerializer(stringSerializer);
        redisTemplate.setHashValueSerializer(stringSerializer);
        return redisTemplate;
    }
}
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原文  https://juejin.im/post/5efd5ab5f265da22ac258d88
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