paxos
paxos use in mesos
http://mesos.apache.org/documentation/latest/replicated-log-internals/
zab
use in zookeeper, zab v.s. paxos
https://cwiki.apache.org/confluence/display/ZOOKEEPER/Zab+vs.+Paxos
why usually zookeeper/chubby in production?
http://xudifsd.org/blog/2013/08/chubby%EF%BC%88zookeeper%EF%BC%89%E5%92%8Cpaxos/
raft
what's raft?
http://www.solinx.co/archives/415
why zk not chose raft
https://www.quora.com/If-Raft-is-as-good-as-the-papers-claim-why-do-Zookeeper-and-others-implement-other-consensus-algorithms-Why-not-use-Raft
