Orchestrator 集群扩容后新节点无法加入集群 参考
Orchestrator是基于Raft的分布式集群。
现在原有三节点集群基础上，新扩容两个节点。
所有节点更新配置文件，并重启后，新的节点无法加入集群。
新节点报错信息；
2020/09/04 15:22:53 [WARN] raft: Heartbeat timeout from "" reached, starting election
2020/09/04 15:22:53 [INFO] raft: Node at 10.77.243.28:10008 [Candidate] entering Candidate state
2020/09/04 15:22:53 [DEBUG] raft: Votes needed: 3
2020/09/04 15:22:53 [DEBUG] raft: Vote granted from 10.77.243.28:10008. Tally: 1
2020/09/04 15:22:53 [WARN] raft: Remote peer 10.23.116.176:10008 does not have local node 10.77.243.28:10008 as a peer
2020/09/04 15:22:53 [WARN] raft: Remote peer 10.42.137.68:10008 does not have local node 10.77.243.28:10008 as a peer
2020/09/04 15:22:53 [WARN] raft: Remote peer 10.48.153.76:10008 does not have local node 10.77.243.28:10008 as a peer
2020/09/04 15:22:53 [DEBUG] raft: Vote granted from 10.8.249.149:10008. Tally: 2
2020/09/04 15:22:54 [WARN] raft: Election timeout reached, restarting election
2020/09/04 15:22:54 [INFO] raft: Node at 10.77.243.28:10008 [Candidate] entering Candidate state
2020/09/04 15:22:54 [DEBUG] raft: Votes needed: 3
2020/09/04 15:22:54 [DEBUG] raft: Vote granted from 10.77.243.28:10008. Tally: 1
2020/09/04 15:22:54 [WARN] raft: Remote peer 10.23.116.176:10008 does not have local node 10.77.243.28:10008 as a peer
2020/09/04 15:22:54 [WARN] raft: Remote peer 10.42.137.68:10008 does not have local node 10.77.243.28:10008 as a peer
2020/09/04 15:22:54 [WARN] raft: Remote peer 10.48.153.76:10008 does not have local node 10.77.243.28:10008 as a peer
2020/09/04 15:22:54 [DEBUG] raft: Vote granted from 10.8.249.149:10008. Tally: 2
2020/09/04 15:22:55 [WARN] raft: Election timeout reached, restarting election
2020/09/04 15:22:55 [INFO] raft: Node at 10.77.243.28:10008 [Candidate] entering Candidate state
2020/09/04 15:22:55 [DEBUG] raft: Votes needed: 3
2020/09/04 15:22:55 [DEBUG] raft: Vote granted from 10.77.243.28:10008. Tally: 1
2020/09/04 15:22:55 [WARN] raft: Remote peer 10.23.116.176:10008 does not have local node 10.77.243.28:10008 as a peer
2020/09/04 15:22:55 [WARN] raft: Remote peer 10.42.137.68:10008 does not have local node 10.77.243.28:10008 as a peer
2020/09/04 15:22:55 [WARN] raft: Remote peer 10.48.153.76:10008 does not have local node 10.77.243.28:10008 as a peer
2020/09/04 15:22:55 [DEBUG] raft: Vote granted from 10.8.249.149:10008. Tally: 2
查看github 上Orchestrator项目后发现，最新的版本release v3.2.3才增加了对新增节点的支持：
support for api/raft-add-peer and api/raft-remove-peer #1208, addressing #253
具体代码改动见 https://github.com/openark/orchestrator/pull/1208/files。
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