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nodetool decommission

decommission - Deactivate a selected node by streaming its data to other nodes in the cluster.

For example:

nodetool decommission

Warning

Review current disk space utilization on existing nodes and make sure the amount of data streamed from the node being removed can fit into the disk space available on the remaining nodes. If there is not enough disk space on the remaining nodes, the removal of a node will fail. Add more storage to remaining nodes before starting the removal procedure.

Use the nodetool netstats command to monitor the progress of the token reallocation.

Nodetool Reference