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我们还遇到一个问题，就是说，如果缓存服务在本地的ehcache中都读取不到数据，那就坑爹了
这个时候就意味着，需要重新到源头的服务中去拉去数据，拉取到数据之后，赶紧先给nginx的请求返回，同时将数据写入ehcache和redis中
分布式重建缓存的并发冲突问题
重建缓存：比如我们这里，数据在所有的
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幂等性概念在编程中.一个幂等操作的特点是其任意多次执行所产生的影响均与一次执行的影响相同。指可以使用相同参数重复执行，并能获得相同结果，不用担心重复执行会对系统造成改变。
幂等性场景
查询操作：查询一次和查询多次，在数据不变的情况下，查询结果是一样的。select是天然的幂等操作；
删除操作：删除操
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错误日志1234567mysql> show variables like 'log_error';+---------------+---------------------+| Variable_name | Value |+--------
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synchronized关键字最主要的三种使用方式的总结
修饰实例方法，作用于当前对象实例加锁，进入同步代码前要获得当前对象实例的锁
修饰静态方法，作用于当前类对象加锁，进入同步代码前要获得当前类对象的锁 。也就是给当前类加锁，会作用于类的所有对象实例，因为静态成员不属于任何一个实例对象，是类成员（
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synchronize的可重入性在java 内部，同一个线程在调用自己类中其他synchronize方法/块或调用父类的synchronize方法/块都不会阻碍改线程的执行，就是说同一线程对同一个对象锁是可重入的，而且同一个线程可以获取同一把锁多次，也就是可以多次重入。
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