io.lettuce.core.RedisCommandTimeoutException: Command timed out 解决办法

Springboot 集成 redis 项目，

引入包： 默认为 lettuce 客户端连接

 <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-data-redisartifactId>
            
        dependency>

报错信息如下：

 
org.springframework.dao.QueryTimeoutException: Redis command timed out; nested exception is io.lettuce.core.RedisCommandTimeoutException: Command timed out
	at org.springframework.data.redis.connection.lettuce.LettuceExceptionConverter.convert(LettuceExceptionConverter.java:70) ~[spring-data-redis-2.0.5.RELEASE.jar:2.0.5.RELEASE]
	at org.springframework.data.redis.connection.lettuce.LettuceExceptionConverter.convert(LettuceExceptionConverter.java:41) ~[spring-data-redis-2.0.5.RELEASE.jar:2.0.5.RELEASE]
	at org.springframework.data.redis.PassThroughExceptionTranslationStrategy.translate(PassThroughExceptionTranslationStrategy.java:44) ~[spring-data-redis-2.0.5.RELEASE.jar:2.0.5.RELEASE]
	at org.springframework.data.redis.FallbackExceptionTranslationStrategy.translate(FallbackExceptionTranslationStrategy.java:42) ~[spring-data-redis-2.0.5.RELEASE.jar:2.0.5.RELEASE]
	at org.springframework.data.redis.connection.lettuce.LettuceConnection.convertLettuceAccessException(LettuceConnection.java:257) ~[spring-data-redis-2.0.5.RELEASE.jar:2.0.5.RELEASE]
	at org.springframework.data.redis.connection.lettuce.LettuceConnection.pSubscribe(LettuceConnection.java:747) ~[spring-data-redis-2.0.5.RELEASE.jar:2.0.5.RELEASE]
	at org.springframework.data.redis.listener.RedisMessageListenerContainer$SubscriptionTask.eventuallyPerformSubscription(RedisMessageListenerContainer.java:783) ~[spring-data-redis-2.0.5.RELEASE.jar:2.0.5.RELEASE]
	at org.springframework.data.redis.listener.RedisMessageListenerContainer$SubscriptionTask.run(RedisMessageListenerContainer.java:750) ~[spring-data-redis-2.0.5.RELEASE.jar:2.0.5.RELEASE]
	at java.lang.Thread.run(Thread.java:748) [na:1.8.0_151]
 
Caused by: io.lettuce.core.RedisCommandTimeoutException: Command timed out
	at io.lettuce.core.LettuceFutures.awaitOrCancel(LettuceFutures.java:114) ~[lettuce-core-5.0.2.RELEASE.jar:na]
	at io.lettuce.core.FutureSyncInvocationHandler.handleInvocation(FutureSyncInvocationHandler.java:62) ~[lettuce-core-5.0.2.RELEASE.jar:na]
	at io.lettuce.core.internal.AbstractInvocationHandler.invoke(AbstractInvocationHandler.java:80) ~[lettuce-core-5.0.2.RELEASE.jar:na]
	at com.sun.proxy.$Proxy70.psubscribe(Unknown Source) ~[na:na]
	at org.springframework.data.redis.connection.lettuce.LettuceSubscription.doPsubscribe(LettuceSubscription.java:54) ~[spring-data-redis-2.0.5.RELEASE.jar:2.0.5.RELEASE]
	at org.springframework.data.redis.connection.util.AbstractSubscription.pSubscribe(AbstractSubscription.java:130) ~[spring-data-redis-2.0.5.RELEASE.jar:2.0.5.RELEASE]
	at org.springframework.data.redis.connection.lettuce.LettuceConnection.pSubscribe(LettuceConnection.java:745) ~[spring-data-redis-2.0.5.RELEASE.jar:2.0.5.RELEASE]
	... 3 common frames omitted

解决方法：

1.  修改redis超时时间，配置文件中修改配置

2. 添加redis连接池

整体配置如下：

spring:
  redis:
    # Redis服务器地址
    host:  127.0.0.1
    # Redis服务器连接端口
    port: 6379
     # Redis服务器连接密码
    password: 
    # Redis数据库索引
    database: 3
    pool:
    # 连接池最大连接数（使用负值表示没有限制）
      max-active: 10
    # 连接池最大阻塞等待时间（使用负值表示没有限制）
      max-wait: 1
    # 连接池中的最大空闲连接
      max-idle: 10
    # 连接池中的最小空闲连接
      min-idle: 1
    # 连接超时时间（毫秒）
    timeout: 30000
    lettuce:
      pool:
        max-active: 50
        max-wait: -1
        max-idle: 50
        min-idle: 1
但是采用上面的配置添加了连接池，会发现项目启动失败，报错信息也没有。缺少了一个 commons-pool2 连接池的包，加上即可，整体包如下：

<dependency>
    <groupId>org.springframework.bootgroupId>
    <artifactId>spring-boot-starter-data-redisartifactId>
    
dependency>
 
<dependency>
      <groupId>org.apache.commonsgroupId>
       <artifactId>commons-pool2artifactId>
dependency>