spring session cpu占用过高

  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/。

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