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Raft (computer science)
Raft is a consensus algorithm designed as an alternative to Paxos. It was meant to be more understandable than Paxos by means of separation of logic, but it is also formally proven safe and offers some new features.〔 Raft offers a generic way to distribute a state machine across a cluster of computing systems, ensuring that each node in the cluster agrees upon the same series of state transitions. It has a number of open-source reference implementations, with full-spec implementations in Go, C++, Java, and Scala.〔
== Basics ==
Raft achieves consensus via an elected leader. A server in a raft cluster is either a leader, a candidate, or a follower. The leader is responsible for log replication to the followers. It regularly informs the followers of its existence by sending a heartbeat message. Each follower has a timeout (typically between 150 and 300 ms) in which it expects the heartbeat from the leader. The timeout is reset on receiving the heartbeat. If no heartbeat is received the follower changes its status to candidate and starts a new leader election.〔〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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