这其实是一个读占大多数的系统
- 实际上小文件占用磁盘空间不是很大，大文件读的占比更多
Large Object Reads are Prevalent
only 7% (11%) of the reads are smaller than 1 (10) MB, but their total size in terms of storage usage is miniscule.
Furthermore, 28% of the objects are less than 100 MB in size with less than 5% storage footprint.
小文件
a small fraction of the objects are highly popular
网络分布不是很均衡
突发高流量的情况很常见
