Redis command timed out nested exception is io.lettuce.core.RedisCommandTimeoutException

矫情吗；* 2024-03-26 22:22 69阅读 0赞

> 报错如下： ERROR org.springframework.dao.QueryTimeoutException: Redis command timed out; nested exception is io.lettuce.core.RedisCommandTimeoutException: Command timed out after 500 millisecond(s) at org...

报错如下：

ERROR org.springframework.dao.QueryTimeoutException: Redis command timed out; nested exception is io.lettuce.core.RedisCommandTimeoutException: Command timed out after 500 millisecond(s)
    	at org.springframework.data.redis.connection.lettuce.LettuceExceptionConverter.convert(LettuceExceptionConverter.java:70)
    	at org.springframework.data.redis.connection.lettuce.LettuceExceptionConverter.convert(LettuceExceptionConverter.java:41)
    	at org.springframework.data.redis.PassThroughExceptionTranslationStrategy.translate(PassThroughExceptionTranslationStrategy.java:44)
    	at org.springframework.data.redis.FallbackExceptionTranslationStrategy.translate(FallbackExceptionTranslationStrategy.java:42)
    	at org.springframework.data.redis.connection.lettuce.LettuceConnection.convertLettuceAccessException(LettuceConnection.java:268)
    	at org.springframework.data.redis.connection.lettuce.LettuceListCommands.convertLettuceAccessException(LettuceListCommands.java:490)
    	at org.springframework.data.redis.connection.lettuce.LettuceListCommands.lLen(LettuceListCommands.java:159)
    	at org.springframework.data.redis.connection.DefaultedRedisConnection.lLen(DefaultedRedisConnection.java:465)
    	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    	at java.lang.reflect.Method.invoke(Method.java:498)
    	****
    Caused by: io.lettuce.core.RedisCommandTimeoutException: Command timed out after 500 millisecond(s)
    	at io.lettuce.core.ExceptionFactory.createTimeoutException(ExceptionFactory.java:51)
    	at io.lettuce.core.LettuceFutures.awaitOrCancel(LettuceFutures.java:114)
    	at io.lettuce.core.FutureSyncInvocationHandler.handleInvocation(FutureSyncInvocationHandler.java:69)
    	at io.lettuce.core.internal.AbstractInvocationHandler.invoke(AbstractInvocationHandler.java:80)
    	at com.sun.proxy.$Proxy196.llen(Unknown Source)
    	at org.springframework.data.redis.connection.lettuce.LettuceListCommands.lLen(LettuceListCommands.java:157)
    	... 134 more

原因分析：这个情况是我在将SpringBoot从1.X升级到2.X的时候产生的问题，所以大致可以猜到是版本问题。

解决办法：

*  设置超时时间

redis:
        port: 6379
        jedis:
          pool:
            max-active: 50
            max-wait: 5000
            max-idle: 50
            min-idle: 0
        timeout: 500
        host: 47.100.21.110

这种方法无效，解决不了这个问题，我从0改到500还是报错。但是网上绝大多数都是这种方式，实际上我刚更改过来的时候有效过一阵，之后就又不行了。

*  更改依赖

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

在SpringBoot 1.X版本的jar包依赖中，点击进去依赖项如下：

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

升级到SpringBoot 2.X版本之后依赖如下：

<dependencies>
        <dependency>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter</artifactId>
          <version>2.1.2.RELEASE</version>
          <scope>compile</scope>
        </dependency>
        <dependency>
          <groupId>org.springframework.data</groupId>
          <artifactId>spring-data-redis</artifactId>
          <version>2.1.4.RELEASE</version>
          <scope>compile</scope>
          <exclusions>
            <exclusion>
              <artifactId>jcl-over-slf4j</artifactId>
              <groupId>org.slf4j</groupId>
            </exclusion>
          </exclusions>
        </dependency>
        <dependency>
          <groupId>io.lettuce</groupId>
          <artifactId>lettuce-core</artifactId>
          <version>5.1.3.RELEASE</version>
          <scope>compile</scope>
        </dependency>
      </dependencies>

可以看到变化是从jedis依赖变成了lettuce-core依赖，而上面的报错`io.lettuce.core.RedisCommandTimeoutException`也是lettuce-core的异常，所以我的解决方式是先将依赖换回jedis：

<dependency>
    	<groupId>org.springframework.boot</groupId>
    	<artifactId>spring-boot-starter-data-redis</artifactId>
    	<exclusions>
    		<exclusion>
    			<groupId>io.lettuce</groupId>
    			<artifactId>lettuce-core</artifactId>
    		</exclusion>
    	</exclusions>
    </dependency>
    <dependency>
    	<groupId>redis.clients</groupId>
    	<artifactId>jedis</artifactId>
    </dependency>

如上，配置文件不变，Redis连接成功，不再报错。

### 补充（深入一点点，个人理解，勿喷） ###

因为上文是我在版本升级的过程中遇到的，所以当时为了稳定还是继续使用的jedis连接池，但是实际上升级之后应该转向lettuce连接池，毕竟lettuce更好。  
修改依赖：

<dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-redis</artifactId>
    </dependency>
    
    <dependency>
        <groupId>org.apache.commons</groupId>
        <artifactId>commons-pool2</artifactId>
    </dependency>

修改配置文件

spring:
      redis: 
        port: 6379
        lettuce:
          pool:
            max-active: 500
            max-wait: 500
            max-idle: 500
            min-idle: 0
        timeout: 500
        host: 100.10.10.10
        password: password

###### 分析 ######

@Configuration
    @ConditionalOnClass(RedisOperations.class)
    @EnableConfigurationProperties(RedisProperties.class)
    @Import({ 
        LettuceConnectionConfiguration.class, JedisConnectionConfiguration.class })
    public class RedisAutoConfiguration {

首先是加载顺序。

![在这里插入图片描述][a16dd0d9e574a7a5ea8fffa2cc461e84.png]

同时我在`@ConditionalOnClass(RedisClient.class)`和`@ConditionalOnClass({ GenericObjectPool.class, JedisConnection.class, Jedis.class })`类里面打断点，发现仅`RedisClient`执行了，这让我明白为啥`LettuceConnectionConfiguration`配置生效，但是我没明白`RedisClient`为啥执行。。。。项目刚启动就进来这里，再上一层我实在没找到，希望哪位研究到这里可以给个反馈。

我想要抛出`LettuceConnectionConfiguration`配置时失效，有异常信息。

此文仅做记录，尚未分析原因，后续补充。

[a16dd0d9e574a7a5ea8fffa2cc461e84.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/13/287c79abc5f14b53aca560a3c15ef7f9.png

Redis command timed out nested exception is io.lettuce.core.RedisCommandTimeoutException

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