Qdrant 1.19.1 release notes, 4 Sep 2026

Change log

Improvements

https://github.com/qdrant/qdrant/pull/10342, https://github.com/qdrant/qdrant/pull/10420 - Speed up and saturate memory bandwidth in quantized scoring with prefetching
https://github.com/qdrant/qdrant/pull/10391, https://github.com/qdrant/qdrant/pull/10392, https://github.com/qdrant/qdrant/pull/10362, https://github.com/qdrant/qdrant/pull/10437, https://github.com/qdrant/qdrant/pull/10439, https://github.com/qdrant/qdrant/pull/10381 - Rework and batch 4-bit TurboQuant SIMD implementation for better performance
https://github.com/qdrant/qdrant/pull/10441 - Limit query plane allocations for better search performance
https://github.com/qdrant/qdrant/pull/8650 - Improve L2 cosine preprocessing performance on AVX
https://github.com/qdrant/qdrant/pull/10042 - Batch deletion checks for faster full scans
https://github.com/qdrant/qdrant/pull/10054, https://github.com/qdrant/qdrant/pull/10010, https://github.com/qdrant/qdrant/pull/10194 - Batch searches in HNSW for faster search
https://github.com/qdrant/qdrant/pull/10099 - Skip bad items before pushing into HNSW priority queue
https://github.com/qdrant/qdrant/pull/10312, https://github.com/qdrant/qdrant/pull/10333 - Skip point ID resolution in search post processing to improve search performance
https://github.com/qdrant/qdrant/pull/10040, https://github.com/qdrant/qdrant/pull/10066 - Use raw payloads in shard transfer to make payload heavy shard transfers 1.5x faster
https://github.com/qdrant/qdrant/pull/9760 - Make set replica state and abort transfer/resharding crash safe to prevent consensus desync
https://github.com/qdrant/qdrant/pull/9786 - Make restart transfer operation crash safe to prevent consensus desync
https://github.com/qdrant/qdrant/pull/10345 - Query shard status more efficiently, don't build full segment info
https://github.com/qdrant/qdrant/pull/10455 - Faster memory reporting on Linux with cachestat
https://github.com/qdrant/qdrant/pull/10457 - Probe segment memory utilization outside of read locks
https://github.com/qdrant/qdrant/pull/10027 - Honor max_segment_size on filter based updates
https://github.com/qdrant/qdrant/pull/10426 - Support fast HNSW healing cancellation to prevent blocking consensus on shard drop
https://github.com/qdrant/qdrant/pull/10306 - Raise HTTP2 max pending resets on gRPC API to allow higher connection concurrency
https://github.com/qdrant/qdrant/pull/10243 - Expose used CPU cores in /metrics (cpu_cores_used)
https://github.com/qdrant/qdrant/pull/10132 - Extend container runtime detection, include Kubernetes and other runtimes

Bug Fixes

https://github.com/qdrant/qdrant/pull/10201 - Fix data consistency, flush CoW segments before building payload index
https://github.com/qdrant/qdrant/pull/10399 - Fix Gridstore panic on new page after unsafe shutdown, repairs preexisting failures
https://github.com/qdrant/qdrant/pull/10205 - On aborting resharding down, don't block consensus with deferred points for along time
https://github.com/qdrant/qdrant/pull/10324 - Reject vector size larger than 65536
https://github.com/qdrant/qdrant/pull/10143 - Reject empty dense vectors
https://github.com/qdrant/qdrant/pull/10374 - Reject mismatched dimension count in positive/negative examples of recommend average API
https://github.com/qdrant/qdrant/pull/10382 - Not specifying scroll limit would bypass max_query_limit
https://github.com/qdrant/qdrant/pull/10128 - Prevent underestimating is_empty and is_null cardinality
https://github.com/qdrant/qdrant/pull/10101 - Fix is_null filter for unindexed payload fields
https://github.com/qdrant/qdrant/pull/10341 - Fix phrase matching on unindexed payload field not respecting token positioning
https://github.com/qdrant/qdrant/pull/10181 - Propagate mmap read errors back to user rather than panicking
https://github.com/qdrant/qdrant/pull/10338 - Fix concurrent consensus operations awaiters dropping each other
https://github.com/qdrant/qdrant/pull/9957 - Limit tracing ID by 256 bytes, not characters
https://github.com/qdrant/qdrant/pull/9959 - Clamp picking random HNSW layer to lower bound of zero

Security

https://github.com/qdrant/qdrant/pull/10242 - Reject . and .. in collection names