Add a node and then decommission the old node

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

Be sure to use the same version of HCD on all nodes in the cluster, as described in each of the installation methods.

Prepare and start the replacement node:
- If using vnodes: Add nodes to vnode-enabled cluster
- If not using vnodes: Add single-token nodes to a cluster
Confirm that the replacement node is alive:
- If not using vnodes: Run nodetool ring and make sure the output shows the new node as Up.
- If using vnodes: Run nodetool status and make sure the output shows the new node as UN (Up/Normal).
For tarball installations, you must run these commands from the INSTALL_DIRECTORY/resources/cassandra/bin directory.
Note the Host ID of the original node; it is used in the next step.
Using the Host ID of the original node, 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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