几款主流nosq数据库对比:http://www.cnblogs.com/vajoy/p/5471308.html
Redis VS MongoDB:http://www.jianshu.com/p/249defad8592
RacksDB/LevelDB: http://www.cnblogs.com/zoucaitou/p/4183468.html
MongoDB/wiredtiger: https://draveness.me/mongodb-wiredtiger
protobuf: https://www.ibm.com/developerworks/cn/linux/l-cn-gpb/
rocksdb: https://github.com/facebook/rocksdb/wiki
HBase: http://hbase.apache.org/