spring session cpu占用过高-优快云博客

集成spring session很简单，只需几行代码即可。

@Configuration
@EnableRedisHttpSession
public class SessionConfig {

    @Value("${redis.host}")
    private String host;
    @Value("${redis.port}")
    private Integer port;
    @Value("${redis.database}")
    private Integer database;

    @Bean
    public RedisConnectionFactory jedisConnectionFactory() {
        JedisConnectionFactory factory = new JedisConnectionFactory();
        factory.setHostName(host);
        factory.setDatabase(database);
        factory.setPort(port);
        factory.setTimeout(10000);
        return factory;
    }
}

但请注意，使用EnableRedisHttpSession的默认配置，有可能造成cpu占用过高。这是因为默认使用的是SimpleAsyncTaskExecutor，导致监听redis keyEvent事件时频繁创建线程，造成性能消耗。因此解决方案是定义线程池即可。

@Bean
public ThreadPoolTaskExecutor springSessionRedisTaskExecutor() {
    ThreadPoolTaskExecutor springSessionRedisTaskExecutor = new ThreadPoolTaskExecutor();
    springSessionRedisTaskExecutor.setCorePoolSize(8);
    springSessionRedisTaskExecutor.setMaxPoolSize(16);
    springSessionRedisTaskExecutor.setKeepAliveSeconds(10);
    springSessionRedisTaskExecutor.setQueueCapacity(1000);
    springSessionRedisTaskExecutor.setThreadNamePrefix("SESSION_TASK_EXEC");
    return springSessionRedisTaskExecutor;
}

有关spring session的实现原因可参考文章：https://www.cnkirito.moe/spring-session-4/。