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What I usually do is follow the order here https://druid.apache.org/docs/27.0.0/operations/rolling-updates And upgrade service by service. Example : • Rolling upgrade historical • When it’s done, Rolling upgrade middle managers • Then Brokers • Then coordinator-overlords I have not had problems with that procedure. Once I did not respect that and rolling updated all services at the same time, I had a bit of downtime but restarting coordinator-overlords fixed everything.

Hi @Julien Wilmet, looking for are there any commands to execute for upgrade?

afaik there is no upgrade command, I do it by hand by downloading the new release, migrating the config and restarting the node i want to upgrade but with the new version of druid instead of the old one

Okay, thanks!