v2.6.3

## v2.6.3

Release date: October 11, 2025

| Milvus Version | Python SDK Version | Node.js SDK Version | Java SDK Version | Go SDK Version |
|:-------------- |:------------------|:--------------------|:-----------------|:---------------|
| 2.6.3          | 2.6.2             | 2.6.1               | 2.6.5            | 2.6.1          |

We are pleased to announce the release of Milvus 2.6.3, which introduces a variety of exciting new features, improvements, and critical bug fixes. This version enhances system performance, expands functionality, and fixes key issues, providing a more stable experience for all users. Below are the highlights of this release:

### New Features

- Primary Key with AutoID Enabled: Users can now write the primary key field when `autoid` is enabled. ([#44424](https://github.com/milvus-io/milvus/pull/44424) [#44530](https://github.com/milvus-io/milvus/pull/44530))
- Manual Compaction for L0 Segments: Added support for manually compacting L0 segments. ([#44440](https://github.com/milvus-io/milvus/pull/44440))
- Cluster ID Encoding in AutoID: Auto-generated IDs will now include the cluster ID. ([#44471](https://github.com/milvus-io/milvus/pull/44471))
- gRPC Tokenizer Support: Integration of gRPC tokenizer for enhanced query flexibility. ([#41994](https://github.com/milvus-io/milvus/pull/41994))

### Improvements

- Refined the balance checker by implementing a priority queue, improving task distribution. ([#43992](https://github.com/milvus-io/milvus/pull/43992))
- Preloaded BM25 stats for sealed segments and optimized serialization. ([#44279](https://github.com/milvus-io/milvus/pull/44279))
- Nullable fields can now be used as input for BM25 functions. ([#44586](https://github.com/milvus-io/milvus/pull/44586))
- Added support for Azure Blob Storage in Woodpecker. ([#44592](https://github.com/milvus-io/milvus/pull/44592))
- Purged small files right after Woodpecker segment compaction. ([#44473](https://github.com/milvus-io/milvus/pull/44473))
- Enabled random score functionality for boosting queries. ([#44214](https://github.com/milvus-io/milvus/pull/44214))
- New configuration options for the `int8` vector type in autoindexing. ([#44554](https://github.com/milvus-io/milvus/pull/44554))
- Added parameter items to control hybrid search requery policy. ([#44466](https://github.com/milvus-io/milvus/pull/44466))
- Added support for controlling the insertion of function output fields. ([#44162](https://github.com/milvus-io/milvus/pull/44162))
- The decay function now supports configurable score merging for better performance. ([#44066](https://github.com/milvus-io/milvus/pull/44066))
- Improved the performance of binary search on strings. ([#44469](https://github.com/milvus-io/milvus/pull/44469))
- Introduced support for sparse filters in queries.  ([#44347](https://github.com/milvus-io/milvus/pull/44347))
- Various updates to enhance tiered index functionality. ([#44433](https://github.com/milvus-io/milvus/pull/44433))
- Added storage resource usage tracking for scalar and vector searches. ([#44414](https://github.com/milvus-io/milvus/pull/44414) [#44308](https://github.com/milvus-io/milvus/pull/44308))
- Add storage usage for delete/upsert/restful ([#44512](https://github.com/milvus-io/milvus/pull/44512))
- Enabled granular flush targets for `flushall` operations. ([#44234](https://github.com/milvus-io/milvus/pull/44234))
- Datanodes will now use a non-singleton file system for better resource management. ([#44418](https://github.com/milvus-io/milvus/pull/44418))
- Added configuration options for batch processing in metadata.  ([#44645](https://github.com/milvus-io/milvus/pull/44645))
- Error messages now include the database name for better clarity. ([#44618](https://github.com/milvus-io/milvus/pull/44618))
- Moved tracer test to the `milvus-common` repository for better modularization. ([#44605](https://github.com/milvus-io/milvus/pull/44605))
- Moved C API unit test files aside to `src` directory for better organization. ([#44458](https://github.com/milvus-io/milvus/pull/44458))
- Go SDK now allows users to insert primary key data if `autoid` is enabled. ([#44561](https://github.com/milvus-io/milvus/pull/44561))

### Bug fixes

- Resolved CVE-2020-25576 and WS-2023-0223 vulnerabilities. ([#44163](https://github.com/milvus-io/milvus/pull/44163))
- Fixed an issue where logical resources were used for metrics in the quota center on streaming nodes. ([#44613](https://github.com/milvus-io/milvus/pull/44613))
- Set `mixcoord` in `activatefunc` when enabling standby. ([#44621](https://github.com/milvus-io/milvus/pull/44621))
- Removed redundant initialization of storage V2 components. [#44597](https://github.com/milvus-io/milvus/pull/44597))
- Fixed compaction task blocking due to executor loop exit. ([#44543](https://github.com/milvus-io/milvus/pull/44543))
- Refunded loaded resource usage in the `insert/deleterecord` destructor. ([#44555](https://github.com/milvus-io/milvus/pull/44555))
- Fixed an issue where the replicator could not stop and enhanced the replicate config validator. ([#44531](https://github.com/milvus-io/milvus/pull/44531))
- Set `mmap_file_raii_` to `nullptr` when mmap is disabled. ([#44516](https://github.com/milvus-io/milvus/pull/44516))
- Made `diskfilemanager` use the file system from the context. ([#44535](https://github.com/milvus-io/milvus/pull/44535))
- Forced virtual host for OSS and COS in storage V2. ([#44484](https://github.com/milvus-io/milvus/pull/44484))
- Set `report_value` default value when `extrainfo` is not `nil` for compatibility. ([#44529](https://github.com/milvus-io/milvus/pull/44529))
- Cleaned up collection metrics after dropping collections in rootcoord. ([#44511](https://github.com/milvus-io/milvus/pull/44511))
- Fixed segment loading failure due to duplicate field `mmap.enable` properties. ([#44465](https://github.com/milvus-io/milvus/pull/44465))
- Fixed load config parsing errors for dynamic replicas. ([#44430](https://github.com/milvus-io/milvus/pull/44430))
- Handled row-to-column input for dynamic columns in Go SDK. ([#44626](https://github.com/milvus-io/milvus/pull/44626))