flush完了之后System.out.println("cache.getSize():"+cache.getSize());
            System.out.println("cache.getMemoryStoreSize():"+cache.getMemoryStoreSize());
            System.out.println("cache.getDiskStoreSize():"+cache.getDiskStoreSize());输出全是0
cache.getKeys()得到的是空的。
缓存到磁盘了咋用啊?