Initial commit

.gitignore

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+# Compiled Object files, Static and Dynamic libs (Shared Objects)
+*.o
+*.a
+*.so
+
+# Folders
+_obj
+_test
+
+# Architecture specific extensions/prefixes
+*.[568vq]
+[568vq].out
+
+*.cgo1.go
+*.cgo2.c
+_cgo_defun.c
+_cgo_gotypes.go
+_cgo_export.*
+
+_testmain.go
+
+*.exe
+*.test
+*.prof

Documentation/cn/node_rejoin.md

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+## 操作顺序
+考虑一个raft组，初始时组内有三个节点，node id 分别为 1， 2 和 3.
+我们有时候需要先把节点3从组内删除，随后又在节点3上重新启动一个新的raft加入原来的组内。
+在加入时，需要严格遵守先调用ChangeMember接口添加raft成员并且等待命令commit成功后，再启动节点3上的raft。否则可能会有数据丢失的风险。
+
+这是因为有以下一种特殊场景的存在：
+假设初始时1、2、3三个节点1是Leader，此时我们向1提交删除成员3的命令（假设对应的日志index=10），但节点2可能暂时存在故障，它的日志只复制到index=5的位置。删除命令只复制给1，3节点，属于大多数，删除3成功。随后我们又在3节点上重新启动了一个新的raft，新raft的日志是空的。
+然后节点2发起选举，注意此时节点2认为集群的成员还是初始时的1，2，3，它比3节点的新raft日志新，可以选为leader，导致一个最新日志index=5的节点成为集群leader，index=5之后的日志有可能被截断丢失。
+
+出现这种状况的原因在于raft论文讨论成员变更删除又添加一个成员时，都是删除2，添加3，是不同节点id。同一个节点id的话，成员变更和新节点启动需要有上面的顺序约束。这是multiraft下的一个特殊问题，单raft的话新加入的节点可以新的id来安全地避免这个问题。
+
+## PeerID
+`proto.Peer`结构中的PeerID成员表示全局唯一的副本ID，不同group的副本PeerID不一样，同group内的不同副本PeerID也不一样。
+
+PeerID的引入是为了解决node rejoin时，新raft同步旧日志时有可能把之前删除同node上旧raft的命令同步过来并应用，导致新的raft被错误删除的问题。有了PeerID，同node上的新旧raft PeerID不一样，可以区分出来，避免错误删除。
+
+
+
+

LICENSE

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NOTICE

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+CoreOS Project
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+(http://www.coreos.com/).
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+Modified work Copyright 2018 The tiglabs Authors.
+

README.md

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+# Raft
+
+A multi-raft implementation built on top of the [CoreOS etcd raft library](https://github.com/etcd-io/etcd). 
+
+## Installation
+
+Download and install to `GOPATH`:
+```bash
+go get -u github.com/tiglabs/raft
+```
+
+## Features
+
+The CoreOS etc/raft implementation has been modified to add the following features.
+
+- multi-raft support    
+- snapshot manager   
+- merged and compressed heartbeat message    
+- check down replica      
+- single raft's panic is allowed, detectable  
+- new wal implementation    
+- export more run status    
+- implementation batch commit
+
+## License
+
+Licensed under the [Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0). 
+For detail see [LICENSE](LICENSE) and [NOTICE](NOTICE).