LevelDB是Jeff Dean, Sanjay Ghemawat的作品，实在是值得大家仔细品读。Cache机制非常简单，相信大家通过这篇文章能够非常清楚的了解其cache实现，其思路其实和文件系统的cache是一样的。另外，淘宝已经在Tair线上环境中大量使用了LevelDB存储引擎，推荐那岩写的《LevelDB实现解析》，35页的文档，结合着读代码，会对理解代码，有非常大的帮助。

-LevelDB is Jeff Dean and Sanjay Ghemawat s work, it is worth reading carefully.Cache mechanism is very simple, I believe you can through this article is very clear understanding of the Cache, the idea and file system Cache is actually the same.In addition, taobao has extensive use in Tair online environment LevelDB storage engines, recommend that rock write LevelDB implementation parsing, 35 pages of documents, combined with a read the code, to understand the code, there is a very big help.