Adding a node and then decommissioning the old node

You must prepare and start the replacement node, integrate it into the cluster, and then decommission the old node:

Prepare and start the replacement node, as described in Adding nodes to an existing cluster.

If not using vnodes, see Adding single-token nodes to a cluster.

You must install the same version (major, minor, and patch) of DSE on all nodes in the cluster.
Confirm that the replacement node is in UN (Up/Normal) status and state:
- Run nodetool ring if not using vnodes.
- Run nodetool status if using vnodes.
Note the Host ID of the original node, which is output by the nodetool ring or nodetool status command.
Using the original node’s Host ID to decommission the original node from the cluster using the nodetool decommission command.
Run nodetool cleanup on all the other nodes in the same datacenter.

Failure to run nodetool cleanup after adding a node may result in data inconsistencies including resurrection of previously deleted data.

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