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No.

So that means in a given druid cluster, only one S3 bucket can be configured?

As a deep storage, yes only one. But if you really need you can set different deep storages for different historicals and have dynamic peons confs so each tier will have their own S3 bucket

thanks. Could you please provide any documentation available on this?

there is no documentation. Druid is not design for that case. If you still want to do this, read all docs about middlemanagers/middlemanager-less, overlords, historicals, configuration properties (https://druid.apache.org/docs/latest/configuration/), design https://druid.apache.org/docs/latest/design/processes and try to 'hack' it to work

thanks for sharing this