我正在尝试使用主从方法配置redis。有两个从设备和主设备，我正在尝试找出redis master的故障转移场景。我尝试将readfrom slave\u包含在下面提到的配置中。它工作的好几次，后来失败了，我不知道在哪里我错了
错误：

at org.springframework.data.redis.connection.lettuce.LettuceExceptionConverter.convert(LettuceExceptionConverter.java:54)
    at org.springframework.data.redis.connection.lettuce.LettuceExceptionConverter.convert(LettuceExceptionConverter.java:52)
    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.LettuceKeyCommands.convertLettuceAccessException(LettuceKeyCommands.java:817)
    at org.springframework.data.redis.connection.lettuce.LettuceKeyCommands.del(LettuceKeyCommands.java:131)
    at org.springframework.data.redis.connection.DefaultedRedisConnection.del(DefaultedRedisConnection.java:69)
    at sun.reflect.GeneratedMethodAccessor93.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.springframework.data.redis.core.CloseSuppressingInvocationHandler.invoke(CloseSuppressingInvocationHandler.java:61)
    at com.sun.proxy.$Proxy135.del(Unknown Source)
    at org.springframework.data.redis.core.RedisKeyValueAdapter.lambda$put$0(RedisKeyValueAdapter.java:228)
    at org.springframework.data.redis.core.RedisTemplate.execute(RedisTemplate.java:224)
    at org.springframework.data.redis.core.RedisTemplate.execute(RedisTemplate.java:184)
    at org.springframework.data.redis.core.RedisTemplate.execute(RedisTemplate.java:171)
    at org.springframework.data.redis.core.RedisKeyValueAdapter.put(RedisKeyValueAdapter.java:223)
    at org.springframework.data.keyvalue.core.KeyValueTemplate.lambda$insert$0(KeyValueTemplate.java:164)
    at org.springframework.data.keyvalue.core.KeyValueTemplate.execute(KeyValueTemplate.java:346)
    at org.springframework.data.keyvalue.core.KeyValueTemplate.insert(KeyValueTemplate.java:157)
    at org.springframework.data.redis.core.RedisKeyValueTemplate.insert(RedisKeyValueTemplate.java:158)
    at org.springframework.data.keyvalue.core.KeyValueTemplate.insert(KeyValueTemplate.java:140)
    at org.springframework.data.keyvalue.repository.support.SimpleKeyValueRepository.save(SimpleKeyValueRepository.java:101)
    at sun.reflect.GeneratedMethodAccessor180.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.springframework.data.repository.core.support.RepositoryComposition$RepositoryFragments.invoke(RepositoryComposition.java:359)
    at org.springframework.data.repository.core.support.RepositoryComposition.invoke(RepositoryComposition.java:200)
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$ImplementationMethodExecutionInterceptor.invoke(RepositoryFactorySupport.java:644)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:608)
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.lambda$invoke$3(RepositoryFactorySupport.java:595)
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:595)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
    at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:59)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
    at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:93)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
    at org.springframework.data.repository.core.support.SurroundingTransactionDetectorMethodInterceptor.invoke(SurroundingTransactionDetectorMethodInterceptor.java:61)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212)
    at com.sun.proxy.$Proxy136.save(Unknown Source)

这是下面的配置

@bean
public RedisConnectionFactory redisConnectionFactory() {
LettuceClientConfiguration clientConfig = LettuceClientConfiguration.builder()
                    .readFrom(SLAVE_PREFERRED)
                    .build();
            RedisSentinelConfiguration sentinelConfig = new RedisSentinelConfiguration()
                    .master("mysentinelmaster");    
                sentinelConfig.sentinel(xxx,6783);
            return new LettuceConnectionFactory(sentinelConfig,clientConfig);
}
@Bean
    public RedisTemplate<?, ?> redisTemplate() {
        RedisTemplate<?, ?> template = new RedisTemplate<>();
        template.setConnectionFactory(redisConnectionFactory());
        return template;
    }