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In this lightning talk I will present all common combinations of ScyllaDB deployments, single and multi-DC, and how well they play out with Raft based topology management. I'll present ScyllaDB's 2024.2 new feature, zero token nodes, and discuss how they could be used to improve resilience to failure in complex deployments. Another nice feature, which we call "Dynamic voter selection" which is currently available in scylladb.git and our nightly builds helps reduce the load of Raft on large clusters and dynamically adjust Raft to node starts and stops, always maintaining maximal Raft availability.
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 ScyllaDB 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.
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