redis使用连接池连接 redis连接池配置详解

问：

　　集群是怎么部署的？ Redis集群运行原理是什么？Redis的高可用原理？Redis的单线程高并发的原理？

ES分布式架构的原理？ 一般你们的ES是如何优化的？

——————————————————————————————————————————————————

一、SpringBoot配置Reids

1、pom引入spring-boot-starter-data-redis包

<dependency>
   <groupId>org.springframework.boot</groupId>
　　<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

<dependency>
   <groupId>redis.clients</groupId>
　　<artifactId>jedis</artifactId>
   <version>3.4.1</version>
</dependency>
< !-- 设置了连接池的相关参数-->

<dependency>
   <groupId>org.apache.commons</groupId>
　　<artifactId>commons-pool2</artifactId>
</dependency>

2、application.yml配置Redis地址、端口及基本信息

注：如果Redis开启了密码，在timeout前增加password：xxx

# Spring配置
spring:
  # redis配置  
  redis: 
     # 地址
     host: 127.0.0.1
     # 端口，默认为6379
     port: 6379 
     # 连接超时时间
     timeout: 10s
     lettuce:
      pool:
        # 连接池中的最小空闲连接
        min-idle: 0
        # 连接池中的最大空闲连接
        max-idle: 8
        # 连接池的最大数据库连接数
        max-active: 8
        # #连接池最大阻塞等待时间（使用负值表示没有限制）
        max-wait: -1m

　　

　　多redis配置

spring:
  redis:
    host: 127.0.0.1
    port: 6379
    password:
    lettuce:
      pool:
        max-active: 32
        max-wait: 300
        max-idle: 16
        min-idle: 8
    database: 0
  local-redis:
    host: 127.0.0.1
    port: 6379
    database: 0
    password:
    lettuce:
      pool:
        max-active: 16
        max-wait: 100
        max-idle: 8
        min-idle: 4

　　

二、增加RedisConfig.java启动加载类 

　　配置类，采用Lettuce，基本设置如下，套路都差不多，先读取配置，初始化ConnectionFactory，然后创建RedisTemplate实例，设置连接工厂

@Configuration
public class RedisAutoConfig {

    @Bean
    public LettuceConnectionFactory defaultLettuceConnectionFactory(RedisStandaloneConfiguration defaultRedisConfig,
            GenericObjectPoolConfig defaultPoolConfig) {
        LettuceClientConfiguration clientConfig =
                LettucePoolingClientConfiguration.builder().commandTimeout(Duration.ofMillis(100))
                        .poolConfig(defaultPoolConfig).build();
        return new LettuceConnectionFactory(defaultRedisConfig, clientConfig);
    }

    @Bean
    public RedisTemplate<String, String> defaultRedisTemplate(
            LettuceConnectionFactory defaultLettuceConnectionFactory) {
        RedisTemplate<String, String> redisTemplate = new RedisTemplate<>();
        redisTemplate.setConnectionFactory(defaultLettuceConnectionFactory);
        redisTemplate.afterPropertiesSet();
        return redisTemplate;
    }

    @Bean
    @ConditionalOnBean(name = "localRedisConfig")
    public LettuceConnectionFactory localLettuceConnectionFactory(RedisStandaloneConfiguration localRedisConfig,
            GenericObjectPoolConfig localPoolConfig) {
        LettuceClientConfiguration clientConfig =
                LettucePoolingClientConfiguration.builder().commandTimeout(Duration.ofMillis(100))
                        .poolConfig(localPoolConfig).build();
        return new LettuceConnectionFactory(localRedisConfig, clientConfig);
    }

    @Bean
    @ConditionalOnBean(name = "localLettuceConnectionFactory")
    public RedisTemplate<String, String> localRedisTemplate(LettuceConnectionFactory localLettuceConnectionFactory) {
        RedisTemplate<String, String> redisTemplate = new RedisTemplate<>();
        redisTemplate.setConnectionFactory(localLettuceConnectionFactory);
        redisTemplate.afterPropertiesSet();
        return redisTemplate;
    }

    @Configuration
    @ConditionalOnProperty(name = "host", prefix = "spring.local-redis")
    public static class LocalRedisConfig {
        @Value("${spring.local-redis.host:127.0.0.1}")
        private String host;
        @Value("${spring.local-redis.port:6379}")
        private Integer port;
        @Value("${spring.local-redis.password:}")
        private String password;
        @Value("${spring.local-redis.database:0}")
        private Integer database;

        @Value("${spring.local-redis.lettuce.pool.max-active:8}")
        private Integer maxActive;
        @Value("${spring.local-redis.lettuce.pool.max-idle:8}")
        private Integer maxIdle;
        @Value("${spring.local-redis.lettuce.pool.max-wait:-1}")
        private Long maxWait;
        @Value("${spring.local-redis.lettuce.pool.min-idle:0}")
        private Integer minIdle;

        @Bean
        public GenericObjectPoolConfig localPoolConfig() {
            GenericObjectPoolConfig config = new GenericObjectPoolConfig();
            config.setMaxTotal(maxActive);
            config.setMaxIdle(maxIdle);
            config.setMinIdle(minIdle);
            config.setMaxWaitMillis(maxWait);
            return config;
        }

        @Bean
        public RedisStandaloneConfiguration localRedisConfig() {
            RedisStandaloneConfiguration config = new RedisStandaloneConfiguration();
            config.setHostName(host);
            config.setPassword(RedisPassword.of(password));
            config.setPort(port);
            config.setDatabase(database);
            return config;
        }
    }

    @Configuration
    public static class DefaultRedisConfig {
        @Value("${spring.redis.host:127.0.0.1}")
        private String host;
        @Value("${spring.redis.port:6379}")
        private Integer port;
        @Value("${spring.redis.password:}")
        private String password;
        @Value("${spring.redis.database:0}")
        private Integer database;

        @Value("${spring.redis.lettuce.pool.max-active:8}")
        private Integer maxActive;
        @Value("${spring.redis.lettuce.pool.max-idle:8}")
        private Integer maxIdle;
        @Value("${spring.redis.lettuce.pool.max-wait:-1}")
        private Long maxWait;
        @Value("${spring.redis.lettuce.pool.min-idle:0}")
        private Integer minIdle;

        @Bean
        public GenericObjectPoolConfig defaultPoolConfig() {
            GenericObjectPoolConfig config = new GenericObjectPoolConfig();
            config.setMaxTotal(maxActive);
            config.setMaxIdle(maxIdle);
            config.setMinIdle(minIdle);
            config.setMaxWaitMillis(maxWait);
            return config;
        }

        @Bean
        public RedisStandaloneConfiguration defaultRedisConfig() {
            RedisStandaloneConfiguration config = new RedisStandaloneConfiguration();
            config.setHostName(host);
            config.setPassword(RedisPassword.of(password));
            config.setPort(port);
            config.setDatabase(database);
            return config;
        }
    }
}

　　测试类如下，简单的演示下两个template的读写

@SpringBootApplication
public class Application {

    public Application(RedisTemplate<String, String> localRedisTemplate, RedisTemplate<String, String>
            defaultRedisTemplate)
            throws InterruptedException {
        // 10s的有效时间
        localRedisTemplate.delete("key");
        localRedisTemplate.opsForValue().set("key", "value", 100, TimeUnit.MILLISECONDS);
        String ans = localRedisTemplate.opsForValue().get("key");
        System.out.println("value".equals(ans));
        TimeUnit.MILLISECONDS.sleep(200);
        ans = localRedisTemplate.opsForValue().get("key");
        System.out.println("value".equals(ans) + " >> false ans should be null! ans=[" + ans + "]");


        defaultRedisTemplate.opsForValue().set("key", "value", 100, TimeUnit.MILLISECONDS);
        ans = defaultRedisTemplate.opsForValue().get("key");
        System.out.println(ans);
    }

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

上面表示说有多个ConnectionFactory存在，然后创建默认的RedisTemplate就不知道该选择哪一个了，有两种方法

方法一：指定默认的ConnectionFactory

借助@Primary来指定默认的连接工厂，然后在使用工程的时候，通过@Qualifier注解来显示指定，我需要的工厂是哪个（主要是localRedisTemplate这个bean的定义，如果不加，则会根据defaultLettuceConnectionFactory这个实例来创建Redis连接了）

@Bean
@Primary
public LettuceConnectionFactory defaultLettuceConnectionFactory(RedisStandaloneConfiguration defaultRedisConfig,
        GenericObjectPoolConfig defaultPoolConfig) {
    // ...
}

@Bean
public RedisTemplate<String, String> defaultRedisTemplate(
        @Qualifier("defaultLettuceConnectionFactory") LettuceConnectionFactory defaultLettuceConnectionFactory) {
    // ....
}

@Bean
@ConditionalOnBean(name = "localRedisConfig")
public LettuceConnectionFactory localLettuceConnectionFactory(RedisStandaloneConfiguration localRedisConfig,
        GenericObjectPoolConfig localPoolConfig) {
    // ...
}

@Bean
@ConditionalOnBean(name = "localLettuceConnectionFactory")
public RedisTemplate<String, String> localRedisTemplate(
        @Qualifier("localLettuceConnectionFactory") LettuceConnectionFactory localLettuceConnectionFactory) {
    // ...
}