v2.4.21

## v2.4.21

Release Date: January 22, 2025

| Milvus version | Python SDK version | Java SDK version | Node.js SDK version |
|----------------|--------------------|------------------|---------------------|
| 2.4.21         | 2.4.14             | 2.4.10           | 2.4.11              |

We’re excited to announce a new release of Milvus 2.4.21, featuring customizable root privileges, refined concurrency and locking mechanisms, and a host of bug fixes to enhance overall stability and reliability. We encourage you to upgrade or give it a try, and share your feedback to help us continually improve Milvus!

### Features

- Root privileges can be customized ([#39325](https://github.com/milvus-io/milvus/pull/39325))

### Critical bug fixes

- Fixed potential data loss issue caused by restarting MixCoord and flushing concurrently ([#39423](https://github.com/milvus-io/milvus/pull/39423))

### Bug fixes

- Fixed an alias issue that could cause an iterator to traverse the wrong database ([#39301](https://github.com/milvus-io/milvus/pull/39301))
- Resolved slow query problems caused by coarse lock granularity during multi-column loading ([#39290](https://github.com/milvus-io/milvus/pull/39290))
- Fixed a resource group update failure when altering the database ([#39357](https://github.com/milvus-io/milvus/pull/39357))
- Allowed skipping disk quota checks during bulk import ([#39320](https://github.com/milvus-io/milvus/pull/39320))
- Supports Tantivy indexes built from multiple segments ([#39127](https://github.com/milvus-io/milvus/pull/39127))
- Fixed incorrect memory estimation for small segments ([#38910](https://github.com/milvus-io/milvus/pull/38910))
- Fixed ineffective RBAC custom group privilege checks ([#39194](https://github.com/milvus-io/milvus/pull/39194))
- Resolved a server crash caused by passing an empty parameter to RestoreRBAC API ([#39142](https://github.com/milvus-io/milvus/pull/39142))
- Fixed an error reporting issue when automatic refresh config operations failed ([#39073](https://github.com/milvus-io/milvus/pull/39073))
- Fixed unrecognized expressions that used uppercase AND or OR ([#38929](https://github.com/milvus-io/milvus/pull/38929))
- Resolved a partition drop failure that occurred after a load failure ([#38871](https://github.com/milvus-io/milvus/pull/38871))

### Improvements

- Unified style by using CStatus to handle NewCollection CGO calls ([#39306](https://github.com/milvus-io/milvus/pull/39306))
- Unified style by using CStatus to handle NewCollection CGO calls ([#39306](https://github.com/milvus-io/milvus/pull/39306))
- Refactored the delete MVCC function ([#39258](https://github.com/milvus-io/milvus/pull/39258))
- Refined lock granularity in QueryNode ([#38908](https://github.com/milvus-io/milvus/pull/38908))
- Added primary field names in SearchResult and QueryResults ([#39223](https://github.com/milvus-io/milvus/pull/39223))
- Introduced a new Go package to manage proto ([#39129](https://github.com/milvus-io/milvus/pull/39129))
- Cleaned up compaction tasks in compactionhandler ([#38848](https://github.com/milvus-io/milvus/pull/38848))
- Accelerated bitset operations with SIMD ([#39042](https://github.com/milvus-io/milvus/pull/39042))
- Optimized error handling for unloaded collection on QueryNode ([#38920](https://github.com/milvus-io/milvus/pull/38920))
- Updated the default Etcd version to v3.5.16 ([#38973](https://github.com/milvus-io/milvus/pull/38973))