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What do you mean by hot swap mode? And how do you intend to use the tiering? We have done this a lot on Kubernetes, I may be able to share to you what we’ve done.

I mean to change to

druid.worker.category

of one MM during its execution

Ah, unfortunately you have to redeploy when changing that. But it is better to create a StatefulSet per category to be more precise.

Why not use mm-less Druid? If you are in k8s, no need for the middle manager process.

I would love to haha, just need to find the time to R&D it in our lab.