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Valkey Keyspace Notifications in Production: Expired Events, hexpired and Cluster Mode
Run Valkey keyspace notifications in production: why expired and hexpired events lag the TTL, how to subscribe on every cluster node, and when a stream is safer.
Valkey Hash Field Expiration in Production: HSETEX, HGETEX, and HEXPIRE
Give single hash fields their own TTL on Valkey 9: the commands and versions, session, flag, and rate-counter patterns, the memory cost, replication, and the patch floor.
Distributed Locks on Valkey 9 Without Lua: SET IFEQ and DELIFEQ
Build a distributed lock on Valkey 9 without Lua: acquire with SET NX PX, extend with SET IFEQ, release with DELIFEQ, and add fencing tokens for failover.
Valkey Cluster vs Sentinel: Choosing an HA Topology
Decide between Valkey Sentinel and Valkey Cluster on Valkey 9: data size limits, hash tags, numbered databases, client support, failover timing, and a migration runbook.
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