Raft After ScyllaDB 5.2: Safe Topology Changes

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ScyllaDB’s drive towards strongly consistent features continues, and in this talk I will cover the upcoming implementation of safe topology changes feature: our rethinking of adding and removing nodes to a Scylla cluster.
Quickly assembling a fresh cluster, performing topology and schema changes concurrently, quickly restarting a node with a different IP address or configuration - all of this has become possible thanks to a centralized - yet fault-tolerant - topology change coordinator, the new algorithm we implemented for Scylla 5.3. The next step would be automatically changing data placement to adjust to the load and distribution of data - our future plans which I will touch upon as well.