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You're viewing documentation for an unstable version of ScyllaDB Open Source. Switch to the latest stable version.
ScyllaDB relies on the Raft consensus algorithm, which requires at least a quorum of nodes in a cluster to be available. If some nodes are down and the quorum is lost, adding, removing, and replacing a node fails.
See Handling Node Failures for information about recovery actions depending on the number of nodes and DCs in your cluster.