# Weaviate v1.38.5 — v1.38.5 - LSM store performance improvements, Batch vectorization potencial deadlocks Fix, Allocation free reference cacher improvement

- Product: Weaviate (https://whatsnew.fyi/product/weaviate)
- Vendor: Weaviate
- Date: 2026-07-16
- Version: v1.38.5
- Original notes: https://github.com/weaviate/weaviate/releases/tag/v1.38.5
- Permalink: https://whatsnew.fyi/product/weaviate/releases/v1.38.5

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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- **fixed** — Never hold version-map locks across LSM operations
- **fixed** — Repair search time entrypoint
- **fixed** — Fix batch vectorization deadlocks
- **fixed** — Fix vectors invisible to flat cached search after restart with unflushed data
- **changed** — Open dimensions bucket once per shard with sequential-access hint
- **fixed** — Ensure tombstone metric is cleared when resetting the HNSW graph
- **fixed** — Thread per-query budget into sroar merge fan-out
- **fixed** — Sort WALs before recovery so the newest stays the active memtable
- **changed** — Reuse read buffer in objectsByDocID
- **changed** — Reuse read buffer in docID resolution loops
- **changed** — Cache immutable memtable tombstone snapshot for queries
- **changed** — Enable lock-free tombstone reads and write-side lock split
- **changed** — Make in-place segment cleanup switch crash-atomic
- **fixed** — Make class settings optional in generative-google to avoid sending defaults to Gemini
- **changed** — Warn when collection cycles overlap the collection interval
- **fixed** — Skip lazy-unloaded tenant shards in TTL sweep
- **fixed** — Fix HTTP client concurrency in acceptance tests
- **fixed** — Retry memberlist join with deadline
- **fixed** — Expose structured where-filter on the MCP hybrid search tool

##### Breaking Changes 
*none*

##### New Features
*none*

##### Fixes
* fix(hfresh): never hold version-map locks across LSM operations by @asdine in https://github.com/weaviate/weaviate/pull/12119
* Search time entrypoint repair by @trengrj in https://github.com/weaviate/weaviate/pull/11956
* Fix batch vectorization deadlocks by @dirkkul in https://github.com/weaviate/weaviate/pull/12070
* flat: fix vectors invisible to flat cached search after restart with unflushed data by @asdine in https://github.com/weaviate/weaviate/pull/12132
* perf(usage): open dimensions bucket once per shard with sequential-access hint by @antas-marcin in https://github.com/weaviate/weaviate/pull/12106
* When resetting the HNSW graph, ensure tombstone metric is cleared by @trengrj in https://github.com/weaviate/weaviate/pull/12131
* Fix flaky GQL accptance test with EC issues by @dirkkul in https://github.com/weaviate/weaviate/pull/12140
* fix(concurrency): thread per-query budget into sroar merge fan-out (P1a) by @etiennedi in https://github.com/weaviate/weaviate/pull/12076
* ci: switch acceptance tests to use ubicloud-standard-4 runner by @antas-marcin in https://github.com/weaviate/weaviate/pull/12148
* fix(lsmkv): sort WALs before recovery so the newest stays the active memtable by @antas-marcin in https://github.com/weaviate/weaviate/pull/12138
* ci: switch integration and module tests to ubicloud runners by @antas-marcin in https://github.com/weaviate/weaviate/pull/12153
* perf(inverted): reuse read buffer in objectsByDocID by @amourao in https://github.com/weaviate/weaviate/pull/12142
* perf(sorter,group-by): reuse read buffer in docID resolution loops by @amourao in https://github.com/weaviate/weaviate/pull/12143
* perf(lsmkv): cache immutable memtable tombstone snapshot for queries by @amourao in https://github.com/weaviate/weaviate/pull/12051
* perf(lsmkv): lock-free tombstone reads + write-side lock split by @amourao in https://github.com/weaviate/weaviate/pull/12052
* feat(lsmkv): make in-place segment cleanup switch crash-atomic by @antas-marcin in https://github.com/weaviate/weaviate/pull/12156
* fix(generative-google): make class settings optional to avoid sending defaults to Gemini by @antas-marcin in https://github.com/weaviate/weaviate/pull/12123
* feat(usage): warn when collection cycles overlap the collection interval by @antas-marcin in https://github.com/weaviate/weaviate/pull/12174
* Skip lazy-unloaded tenant shards in TTL sweep by @dirkkul in https://github.com/weaviate/weaviate/pull/12178
* refatc(diagnostic): add slow raft apply log gate by @moogacs in https://github.com/weaviate/weaviate/pull/12180
* backport: fix(acceptance-test): handle http client concurrency by @moogacs in https://github.com/weaviate/weaviate/pull/12182
* backport: fix(memberlist): retry on join with deadline by @moogacs in https://github.com/weaviate/weaviate/pull/12183
* chore(rplc-mvmnt): remove `consumer.sync` from happy path due to redundancy by @tsmith023 in https://github.com/weaviate/weaviate/pull/12179
* perf(search): eliminate per-call allocations in SelectProperties lookups by @etiennedi in https://github.com/weaviate/weaviate/pull/12134
* perf(internode): exact-size single-alloc marshalling for fan-out payloads (slice 1/3) by @etiennedi in https://github.com/weaviate/weaviate/pull/12135
* fix(test): widen flaky RansomNote aggregate count assertion by @etiennedi in https://github.com/weaviate/weaviate/pull/12194
* fix(hnsw): entrypoint repair test flake by @trengrj in https://github.com/weaviate/weaviate/pull/12205
* fix(replica-movement): atomic LWW on change-log replay by @moogacs in https://github.com/weaviate/weaviate/pull/12190
* fix(lsmkv): reclaim deleted docs' property lengths at compaction by @amourao in https://github.com/weaviate/weaviate/pull/12147
* fix(lsmkv): track live-set avgdl at compaction so BM25 scores don't drift with deletes (#311) by @amourao in https://github.com/weaviate/weaviate

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