All disscussion about this project: 
  https://groups.google.com/group/xlog-dev

Reference:
I. About ICE
  ICE is a open source grid computing software. 
  We use it as RPC protocal because of the wide range deployment in our production enviroument.
  ICE Homepage is: http://www.zeroc.com

II. About Zookeeper
  Zookeeper is a distributed locking system, providing consistent and good performance.
  Zookeeper Homepage is: http://zookeeper.apache.org
  Note: After compiling and install zookeeper/src/c, the header files in include directory is named c-client-cpp.
    PLEASE rename it to zookeeper. (This is the way we deploy it)