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100 % agree we need good (etch/zookeeper) as a library.

I wrote something similar but that provide only (lock/lease) using paxos.

The problem with raft ETCD and zookeeper replicates state machine design is that : - machine leaving and joining the ensemble dynamically is something hard to do correctly - optimal quorum size is no more than 5, you can setup other node as observer but it’s hard to decide which of 1000 node should be in the quorum ...

The etcd server can be embedded in other projects, and their Raft library is used by plenty of other projects like CockroachDB.

yes it can but it’s a real pain compared to hashicorp version. I really hope they clean up the library to have a simple API.

This way it could become the standard for GO and we can stop wasting effort on multiple raft implementation.

Isn't this exactly what lead to Hashicorp's memberlist library being used all over in random projects?

Sounds good to me, more things like ZooKeeper should be embeddable.