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>
<!-- 如果使用Lettuce作为连接池,需要引入commons-pool2包,否则会报错bean注入失败 -->
<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。
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。