Valkey clusters unboxed
summary
Valky is a Redis fork (since March 2024) with Valky 8.1 released April 2025; claims include >1M RPS on a cH2XL-like AWS instance and ~20% memory reduction per recent release by packing keys and adding an IO thread to a single-threaded core. Cluster specifics: 16,384 slots, mesh gossip over a 2KB cluster-bus header with ~100B gossip entries, 1s pings and 15s default timeout, epoch-based failover (one promotion per epoch). Benchmarks show 2,000-node convergence, single-failover <10s, 10% node loss ~20s, one-third loss ~60s.
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chapters (12)
- 0:00Valkey introduction
- 4:46Community improvements
- 7:13Standalone deployment modes
- 10:47Cluster architecture
- 15:03Cluster membership
- 18:58Failure detection
- 29:11Node failures
- 31:23Epoch values
- 37:13Slot migration
- 39:43Scaling to 2000 nodes
- 44:28Debugging large clusters
- 46:59Future clustering
related talks
45mDemystifying Valkey Clustering: Architecture, Fault Tolerance, and Scalability
33mDiscover Valkey: The Path to Now
41mValkey 8 — Release of a Redis Fork Focused on Performance
10mThe unreasonable effectiveness of key value databases
27mAn Introduction to Messaging in Valkey
40mHarder, Better, Faster, Stronger - Building Valkey-Timeseries
36mWhat’s New in Valkey
14mMigrating 15k Redis servers to Valkey