## Summary - Pick up three jvector fixes from branch `fix/sparse-int-map-overhead-issue-3` on top of `4.0.0-rc.9-herddb-SNAPSHOT` (artifact version unchanged): `BufferVectorFloat` zero-copy vectors, `DenseIntMap` segmented spine + `initialCapacity` hint, and the new static `OnHeapGraphIndex.estimatedBytesPerNode(maxDegree, overflowRatio)` helper plus sharded `SparseIntMap`. - Replace the hand-rolled HNSW per-node byte sum in `PersistentVectorStore.estimatedBytesPerVector(...)` with `OnHeapGraphIndex.estimatedBytesPerNode(m, neighborOverflow)` so the estimate tracks upstream `ConcurrentNeighborMap` / `Neighbors` layout changes automatically. The instance-based accounting in `shardMemoryBytes(...)` already uses jvector's `ramBytesUsed()` and therefore inherits the `SparseIntMap` heap savings via recompile. - Zero-copy ingest/search and the `initialCapacity` hint were already wired in HerdDB (issue #223 / issue #228), so no call-site change is needed — the perf improvements land purely via the refreshed jvector jar. ## Test plan - [x] `mvn -B checkstyle:check apache-rat:check spotbugs:check install -DskipTests -Pci` — BUILD SUCCESS (all 20 modules). - [x] `mvn -Pci -pl herddb-core -Dtest='PersistentVectorStore*Test,VectorIndexTest' test` — 52/52 pass. - [x] `mvn -Pci -pl herddb-core -Dtest='DirectMultipleConcurrentUpdatesSuiteNoIndexesTest,DirectMultipleConcurrentUpdatesSuiteWithNonUniqueIndexesTest,DirectMultipleConcurrentUpdatesSuiteWithUniqueIndexesTest' test` — 12/12 pass, run twice (CLAUDE.md hammer gate). - [ ] CI green against the refreshed jvector branch. - [ ] Vector indexing smoke on k3s-local / GKE confirms the `SparseIntMap` heap savings in `IndexingService` pod accounting. Closes #232. 🤖 Generated with [Claude Code](https://claude.com/claude-code) --------- Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Pickup jvector improvements on locking and memory accounting #232

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