v2.4.0

Release date: April 17, 2024

We are excited to announce the official launch of Milvus 2.4.0. Building upon the solid foundation of the 2.4.0-rc.1 release, we have focused on addressing critical bugs reported by our users, while preserving the existing functionality. In addition, Milvus 2.4.0 introduces a range of optimizations aimed at enhancing system performance, improving observability through the incorporation of various metrics, and streamlining the codebase for increased simplicity.

Improvements

• Support for MinIO TLS connections (#31396, #31618)
• AutoIndex support for scalar fields (#31593)
• Hybrid search refactoring for consistent execution paths with regular search (#31742, #32178)
• Accelerated filtering through bitset and bitset_view refactoring (#31592, #31754, #32139)
• Import tasks now support waiting for data index completion (#31733)
• Enhanced Import compatibility (#32121), task scheduling (#31475), and limits on imported file size and number (#31542).
• Code simplification efforts including interface standardization for type checking (#31945, #31857), removal of deprecated code and metrics (#32079, #32134, #31535, #32211, #31935), and normalization of constant names (#31515)
• New metrics for QueryCoord current target channel check point lag latency (#31420)
• New db label for common metrics(#32024)
• New metrics regarding the count of deleted, indexed, and loaded entities, with the inclusion of labels such as collectionName and dbName (#31861)
• Error handling improvements for mismatched vector types (#31766)
• Support for throwing errors instead of crashing when index cannot be built (#31845)
• Support for invalidating the database meta cache when dropping databases (#32092)
• Interface refactoring for channel distribution (#31814) and leader view management (#32127)
• Refactor channel dist manager interface(#31814) and Refactor leader view manager interface(#32127)
• Batch processing (#31632), adding mapping information (#32234, #32249), and avoiding usage of lock (#31787) to accelerate frequently invoked operations

Breaking Changes

• Discontinued grouping search on binary vectors (#31735)
• Discontinued grouping search with hybrid search(#31812)
• Discontinued HNSW index on binary vectors (#31883)

Bug Fixes

• Enhanced data type and value checks for queries and insertions to prevent crashes (#31478, #31653, #31698, #31842, #32042, #32251, #32204)
• RESTful API bug fixes (#32160)
• Improved prediction of inverted index resource usage (#31641)
• Resolution of connection issues with etcd when authorization is enabled (#31668)
• Security update for nats server (#32023)
• Stored inverted index files into a local storage path of QueryNode instead of /tmp (#32210)
• Addressed datacoord memory leaks for collectionInfo (#32243)
• Fixes for fp16/bf16 related bugs potentially causing system panic (#31677, #31841, #32196)
• Resolved issues with grouping search returning insufficient results (#32151)
• Adjustment of search with iterators to handle offsets in the Reduce step more effectively and ensure adequate results with "reduceStopForBest" enabled (#32088)