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drop in replacement doesn't change anything about my question, interfaces are not all what matters

and now knowing more about it I would say the answer to my question is a clear yes, it used ZK for something ZK wasn't at all intended for

which means it makes a lot of sense that they replace it

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Are you perhaps confusing ClickHouse, with ClickHouse Keeper (one of ClickHouse's components?) Sounds to me like ClickHouse is the database, and ClickHouse Keeper is the ZK drop-in replacement. A bit like HBase being a database, and ZooKeeper being a service it is heavily dependent on.

yes and no

yes I confused the quotes

but the question in general about weather ClickHouse Keeper and ZooKeeper are designed for completely different use-cases which happen to be similar and can work with the same interface still stands

and by now knowing more then my original comment I would answer the question with yes

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