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by kbumsik 1475 days ago
Actually I was asking the question looking at the etcd doc you linked. The etcd doc explains like it is just better than Zookeeper.

Then why there are so many projects still rely on Zookeeper and spend so much time on re-writing its features instead of switching to etcd like what OP, ClickHouse (in the discussion), and Kafka (KRaft) are doing? It there something that etcd won't fit?
2 comments
hodgesrm 1475 days ago
ClickHouse chose an API compatible rewrite because it allowed the project to banish issues like Zookeeper transaction ID rollover and eliminate an external dependency while allowing a gentle migration to the new "ClickHouse Keeper" implemention. Existing prod deployments of ClickHouse are mostly still on Zookeeper, though new deployments are beginning to use ClickHouse Keeper from the start.

There's a good talk by ClickHouse committer Alexander Sapin that explains the design considerations: https://www.youtube.com/watch?v=abhcCRW09Ac

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dikei 1475 days ago
Very few new projects use Zookeeper now. For older projects, most of them have no issue using Zookeeper, so it's simply not worth the time to rewrite them for etcd.
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