nodetool decommission 

Deactivates a node by streaming its data to another node.

Deactivates a node by streaming its data to another node.

Synopsis 

$ nodetool <options> decommission
Options
Short Long Description
-h --host Hostname or IP address
-p --port Port number
-pwf --password-file Password file path
-pw --password Password
-u --username User name
-- Separates an option from an argument that could be mistaken for a option.

Description 

Causes a live node to decommission itself, streaming its data to the next node on the ring. Use netstats to monitor the progress.