Replacing a running node

Steps to replace a node with a new node, such as when updating to newer hardware or performing proactive maintenance.

Only add new nodes to the cluster. A new node is a system in which DataStax Enterprise (DSE) has never started. The node must have absolutely NO PREVIOUS DATA in the data directory, saved_caches, commitlog, and hints. Adding nodes previously used for testing or that have been removed from another cluster, merges the older data into the cluster and may cause data loss or corruption.

You can replace a running node in two ways:

Adding a node and then decommissioning the old node: Two methods for replacing a node with a new node, such as when updating to newer hardware or performing proactive maintenance.
Replacing a running node: Replace a node that is currently running without streaming the data twice.

Replacing a running node

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