port etcd joint consensus

[BusyJay]

We have developed ours implementation but as discussed in the past, we decided to go with the community and port the implement of etcd instead.

There will be several PRs:

• raft: use half-populated joint quorum etcd-io/etcd#10779
• raft: centralize configuration change application etcd-io/etcd#10865
• raft: never remove the last voter etcd-io/etcd#10884
• raft: internally support joint consensus etcd-io/etcd#10889
• raft: allow use of joint quorums etcd-io/etcd#10914
• raft: fix restoring joint configurations etcd-io/etcd#11003
• raft/rafttest: introduce datadriven testing etcd-io/etcd#11005
• raft: fix auto-transitioning out of joint config etcd-io/etcd#11046

The PRs doesn't have to be picked one by one. And we probably sync the code with upstream first.

[Fullstop000]

Does #318 need to be merged first?

[BusyJay]

I will send a new PR and do it in a different way.

[jayzhan211]

I would like to try #10779

[BusyJay]

Thanks @accelsao! I'm already working on it.

[BusyJay]

@accelsao Hi, are you interested in porting data driven tests? I have tried to contact you on slack, but it seems you don't check it recently.

[jayzhan211]

ok, I will try it

[BusyJay]

Thanks! You can do it package by package. You can also contact me on slack or github if you have any questions.

[drogus]

Are there any updates on these issues? I'd be happy to help if there's still something left to do.

[jayzhan211]

only tests are left

1. majority-joint-commit
2. vote
3. group-commit