# 应用层

- [Raft协议](/etcd/arch/logic/raft.md)
- [复制状态机](/etcd/arch/logic/state_machine.md)
- [多版本并发控制](/etcd/arch/logic/mvcc.md)
- [K-V存储](/etcd/arch/logic/kv.md)
- [发布订阅](/etcd/arch/logic/subpub.md)
- [分布式事务](/etcd/arch/logic/dis_trans.md)