http://blog.csdn.net/sparkliang/article/category/1342001
http://www.blogjava.net/sandy/category/51018.html
http://dirtysalt.info/leveldb.html
https://leveldb.googlecode.com/svn/trunk/doc/impl.html
http://leveldb.googlecode.com/svn/trunk/doc/index.html
http://mingxinglai.com/cn/2015/08/gdb-leveldb/
http://luodw.cc/2015/11/01/leveldb-17/
http://www.cnblogs.com/desmondwang/p/4824290.html
