Add node (bootstrap)
1. Configure cassandra.yaml with cluster + seeds + DC/rack. 2. Start. 3. Streams data from existing owners. 4. Joins ring.
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Decommission
nodetool decommission. Node streams data to takers. UN in status → left. Multi-hour.
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Removenode
For dead node. nodetool removenode <id>. Other replicas serve missing data via repair. Faster than decommission for dead node.