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Temporalv1.27
What's New in Temporal Server 1.27
Temporal 1.27 graduates Nexus to stable, adds multi-region namespace support, and ships significant reductions in history service memory — making it practical to run Temporal for very high-throughput workloads on cost-efficient hardware.
What's New
- 1Nexus stable — cross-namespace and cross-cluster workflow invocation is now production-ready for multi-team platforms
- 2Multi-region namespaces — automatically replicate namespaces across regions for disaster recovery without application changes
- 3Workflow Update (synchronous request/response to running workflows) promoted to stable
- 4History service memory reduced by ~40% through improved batch compression and LRU cache tuning
- 5Worker versioning v2 — more ergonomic blue/green deployments with simplified version sets
- 6New UI: workflow search with full SQL-like filter syntax across all visibility fields
- 7Go SDK 1.30+ adds typed search attribute APIs and improved payload serialisation
Breaking Changes
- Nexus v0 (preview) API removed — migrate to stable Nexus API if you adopted it early
- Minimum Cassandra version raised to 4.0 for deployments using Cassandra persistence
- go.temporal.io/sdk minimum version bumped to 1.28 for new server features
Upgrade Notes
Multi-region namespace is opt-in and requires no migration for existing namespaces. Worker versioning v2 is backwards-compatible — old version sets continue working until explicitly migrated.