Not to be a the stick in the mud here. We recently moved from Clickhouse to Druid due to issues we were having when scaling and rebalancing the cluster. How does removing ZK help?
When we did a PoC, the operational aspect of clickhouse and performance was severely lacking as compared to druid. Clickhouse had bigger resources at its disposal than druid during this PoC.
If they could improve the operational aspect and introduce sensible defaults so that the users don't have to go through 10000 configuration to work with data in clickhouse, I am sure I will give it a go for some other usecase. It is simple on surface but devil is in the details. Druid is much simpler and sane at the scale I need to operate.
Clickhouse cluster quite simply doesn’t support elastic rebalancing. Avoid CH if that is a hard requirement for your setup.
https://timeflow.systems/why-we-moved-from-druid-to-clickhou...
Clickhouse is significantly easier to operate than Druid in my experience.