redis的C客户端hiredis不支持sharding，所以将ketama算法抽出来合并到hiredis里面了，增加了sharding功能。-the redis C client hiredis does not support sharding, so the ketama algorithm out to merge to hiredis inside, an increase of sharding function.

sharding-jdbc 源码包，数据库的分库分表功能(Sharding-jdbc source package, database sub library, table function)