Hello team, I wanted to drop a server instance from a cluster to shrink cluster size. So I executed command below after helm chart update but met an error.

curl -XDELETE localhost:9000/instances/Server_pinot-server-2.pinot-server-headless.dev-pinot.svc.cluster.local_8098

{"_code":409,"_error":"Failed to drop instance Server_pinot-server-2.pinot-server-headless.dev-pinot.svc.cluster.local_8098 - Instance Server_pinot-server-2.pinot-server-headless.dev-pinot.svc.cluster.local_8098 exists in ideal state for user2_REALTIME"}

• What will happen if i update zk's idealstate of all tables related to server-2 to server-1? (table status became healthy again) • Will also there be automatic copy based on other segment to maintain replica desire?

https://docs.pinot.apache.org/operators/operating-pinot/rebalance/rebalance-servers this should help

@Kishore G Thanks a lot! I tried that one through GUI after server deletion but met this one.

Caused by: java.net.UnknownHostException: pinot-server-2.pinot-server-headless.dev-pinot.svc.cluster.local

I think the sequence is to first untag the server, then rebalance, and then remove the server.

@Mayank Thanks for reply. I got aware of untag now. Does the rebalance do same thing internally with what i did?

Rebalance does not untag.