milvus-io/milvus v2.6.7

milvus-2.6.7

on GitHub

v2.6.7

Release date: December 4, 2025

Milvus 2.6.7 is a critical stabilization update for the 2.6.x series. This release focuses on hardening the system against distributed failures and optimizing resource utilization under high load. With significant improvements in I/O handling, memory management, and Kubernetes integration, we strongly recommend all production users upgrade to this version to ensure greater reliability and smoother operation at scale.

Features

• Added /livez endpoint to support Kubernetes native liveness probes, improving container orchestration stability (#45481).
• Added support for GroupBy operations on TIMESTAMPZ fields, enhancing time-series analytics capabilities (#45763)
• Supported mmap for JSON shredding's shared key indices to reduce RAM footprint (#45861)

Improvements

• Supported DML request forwarding in the Proxy to improve write availability and routing resilience (#45922).
• Upgrade etcd to v3.5.23 to address consensus stability and performance regressions (#45953).
• Added robust error handling for Etcd server crashes to prevent cascading component failures (#45633).
• Reduced Etcd load by removing expensive watchers for simple session liveness checks (#45974).
• Enhanced the WAL retention strategy to better balance disk usage with data recovery safety (#45784).
• Supported asynchronous write syncing for logs to prevent disk I/O blocking from affecting the main execution path (#45806).
• Enforced Buffered I/O usage for high-priority load tasks to optimize OS page cache utilization and throughput (#45958).
• Optimized mmap strategy to map group chunks in a single system call, reducing kernel overhead during segment loading (#45893).
• Improved the accuracy of memory estimation for JSON shredding to prevent OOM kills or under-utilization (#45876).
• Refined segment load estimation to account for both eviction and warmup states (#45891).
• Added granular cancellation checks in query operators to allow faster termination of aborted or timed-out queries (#45894).
• Removed redundant resource type checks in file resource configuration (#45727).

Bug fixes

• Interleaved Go and C++ logs into a unified stream to provide a correct chronological view for debugging (#46005).
• Resolved a race condition where LastConfirmedMessageID could be incorrect under high concurrency writes (#45874).
• Fixed a calculation error in aggregating allsearchcount from multiple search results (#45904).
• Fixed Term expressions to correctly handle string containment logic within JSON arrays (#45956).
• Replaced json.doc() with json.dom_doc() in JSONContainsExpr to fix parsing behaviors and improve performance (#45786).
• Fixed a panic in Standby MixCoord components during the shutdown sequence (#45898).
• Fixed the leader checker to ensure segment distribution is correctly synchronized to Read-Only nodes (#45991).
• Ensured HandleNodeUp is triggered during node re-watching to maintain correct load balancing topology (#45963).
• Implemented fallback to remote WAL storage if local WAL storage becomes unavailable (#45754).
• Added EmptySessionWatcher to prevent panics when running in IndexNode binding mode (#45912).
• Ensured memory state consistency when recovering broadcast tasks from protocol buffers (#45788).
• Addressed thread-safety issues in SegCore collection schema updates (#45618).
• Enforced Access Control (RBAC) checks for ListImport and GetImportProgress APIs (#45862).
• Fixed a bug where BulkImport would fail if the input contained an empty struct list (#45692).