What's New in Valkey 9?
summary
Valkey 9 is available as a release candidate and focuses on three concrete upgrades: cluster-mode multiple databases become first-class logical namespaces that scale horizontally with zero overhead if unused; atomic slot migration implements a forked snapshot + AOF-field replication so big keys migrate without client-visible partial failures (avoids the old “mini outage” and data-loss workarounds); and per-hash-field TTLs use coarse buckets to keep ops O(1) with ~16–27 bytes/item overhead (10M expired fields delete in ~26s if in one hash vs ~6s when sharded). Performance wins include the 1 million requests/sec target, dual-channel replication speedups, and ~20% memory reduction from engine changes.
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chapters (9)
- 0:00Introduction to Valkey 9
- 1:07What is Valkey?
- 3:15Valkey 8 year in review
- 6:20Valkey 9 features overview
- 7:01Multi-databases in cluster mode
- 12:01Atomic slot migration explained
- 22:58Hashfield expiration feature
- 36:29Other improvements in Valkey 9
- 38:42Q&A session
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