@Elon the realtime consumer automatically adjusts to new tags that may be there in the cluster and removes segments from untagged ones. This is done over time. So, any new consuming segments are allocated ONLY amongst the tagged servers that exist at the time of newly created segment. The old segments (already consumed ones) are left to be retained out (unless you invoke rebalanlce). That said, if you had (say) 4 replicas configured, and only 3 tagged instances exist, then we continue consumption as before on an untagged host sine we don't want to run the risk of losing a replica

Thanks, that's good to know! I rebalanced all the tables and then the instances were successfully dropped. Since they didn't exist the rebalance completed quickly.

normally you should not need the rebalance, If the old hosts are not decommissioned, the segemnts ther will just retain out.

Thanks! I just tag with

["DefaultTenant_OFFLINE","DefaultTenant_REALTIME"]

?

multiple tags are always fine, of course

@Subbu Subramaniam question - will the old servers continue to serve the queries?

No, they never existed, I think another team that is trying out pinot accidentally added the instances. But just so I know if this ever happens again, what would we have to do if the servers did serve queries?

@Ravi Singal yes

Thanks @Subbu Subramaniam. good to know that.