chubby使用paxos作为日志错误容错的复制算法，在协议栈的最底层，paxos算法确保了每个replica的本地日志都有相同的entries，replicas的通信则是通过paxos-specific protocal，一旦某个值进入容错日志，每个replica会调用发送一个callback给客户端应用程序，告诉这个已提交的值 chubby的paxos描述【隐藏了propo

关键词解释 coarse-grained: an application might use a lock to elect a primary, which would then handle all access to that data for a considerable time, perhaps hours or days. An application might partitio