[tae898]

Bumps io.github.jbellis:jvector from 4.0.1 to 4.0.2 (the latest release) and keeps its new native vectorization off unless it is configured. No open or merged PR covers this bump (the last one was #8518, 4.0.0-rc.9 to 4.0.1).
Why bump. 4.0.2 fixes duplicate neighbour ids in the graph builder (datastax/jvector#738, #765), which matters for graphs built with approximate (PQ) scoring. It is a drop-in for the code here: in a swap of the jar into a build of main, recall@10 was identical to four decimals for FLAT and INT8 on 100k SIFT vectors, and the sparse index, reopen after close and INT8 paths behaved as before.
Why native vectorization is off by default for now. 4.0.2 bundles a native library (Highway, called through the Java foreign function API) and uses it by default on Linux x86_64 and aarch64 with Java 22 or later. Each distance between two vectors becomes one foreign call, and vectors become MemorySegment-backed objects. In an untimed profile of an index build of 128-dimension vectors on an AVX2 laptop (E-cores), about half of the samples were in that per-call wrapper and a smaller share in the SIMD kernel, and the build was slower with native on in every untimed sample. That is a hypothesis about a mechanism and one CPU class, not a benchmark. A measured comparison on more CPUs (AVX-512, aarch64, higher dimensions) follows, and the default can change if the evidence supports it. Until then the bump keeps the behaviour of 4.0.1, which is the Java Vector API.
How to enable it. Set arcadedb.vectorIndex.nativeVectorization=true (JVM scope, so a -D, an environment variable or GlobalConfiguration before the first database is opened), or pass -Djvector.enable_native_vectorization=true to the JVM. An explicit jvector property, or its deprecated alias jvector.experimental.enable_native_vectorization, always wins over the setting in both directions, and -Djvector.vectorization_provider wins over both. VectorApiSupport.configureJVectorProvider(), which already runs in LocalDatabase's class initializer and before VectorApiSupport.jvectorProvider() resolves jvector (added in #10077), now also applies the setting, so it works for embedded and server use.
Packaging notes. The native library sits in the jvector jar for Linux x86_64 and aarch64. jvector copies it to java.io.tmpdir and loads it from there. If that directory is read-only or mounted noexec, or the platform is macOS or Windows, jvector logs a warning and uses the Java Vector API. --enable-native-access=ALL-UNNAMED (already passed by server.sh and the test configuration) silences the restricted-method warning that Java 22 to 25 print otherwise. It needs --add-modules jdk.incubator.vector too. A GraalVM native image is unchanged: #10077 forces jvector's scalar provider there unless the user chose one, and that covers the new native provider as well.
Tests. New JVectorProviderSelectionTest starts a fresh JVM per case (jvector chooses once per JVM) and asserts the provider class: Panama by default and with the setting false, native with the setting, with -Djvector.enable_native_vectorization=true and with the deprecated alias, and the explicit property or a forced provider winning over the setting. Where the platform has no native provider (not Linux x86_64 or aarch64, or Java before 22) the same cases expect Panama, so nothing is skipped. VectorApiSupportTest gains the decision-table and default checks. Run in maven:3.9-amazoncorretto-25 (Java 25, Linux x86_64): VectorApiSupportTest and JVectorProviderSelectionTest (16 tests), and the vector suite of the engine (*Vector*Test, Issue*Vector*, LSMVector*, LSMSparse*, PQ*, Quantiz*, JVector*, GloVe*, DuplicateVectorId* and the quantization and PQ file issue tests, benchmarks excluded: 977 tests, 0 failures) on the default and again with JAVA_TOOL_OPTIONS=-Djvector.enable_native_vectorization=true (977 tests, 0 failures). Not run: the GraalVM native image build, macOS, Windows, aarch64.

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Summary by CodeRabbit

• New Features

  • Added the arcadedb.vectorIndex.nativeVectorization JVM setting to control native vectorization for vector indexes.
  • Native vectorization is supported on compatible Linux x86_64 and aarch64 systems running Java 22 or later, with automatic fallback when unavailable.
  • Explicit JVector properties, including the deprecated property, take precedence over the ArcadeDB setting.

• Enhancements

  • Updated JVector to version 4.0.2, improving native vectorization support.

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• ATTRIBUTIONS.md
• engine/pom.xml
• engine/src/main/java/com/arcadedb/GlobalConfiguration.java
• engine/src/main/java/com/arcadedb/utility/VectorApiSupport.java
• engine/src/test/java/com/arcadedb/utility/JVectorProviderSelectionTest.java

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• engine/src/main/java/com/arcadedb/GlobalConfiguration.java
• engine/pom.xml

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📝 Walkthrough

The change updates JVector to version 4.0.2 and adds an ArcadeDB setting for native vectorization. Provider configuration preserves explicit JVector properties. Tests cover provider selection, runtime conditions, and setting precedence.

Changes: JVector Native Vectorization

Layer / File(s)	Summary
Dependency and configuration setting engine/pom.xml, ATTRIBUTIONS.md, engine/src/main/java/com/arcadedb/GlobalConfiguration.java	JVector moves to version 4.0.2. Runtime attribution is updated. GlobalConfiguration adds a JVM-scoped native-vectorization setting that is disabled by default.
Provider configuration engine/src/main/java/com/arcadedb/utility/VectorApiSupport.java	VectorApiSupport applies the ArcadeDB setting only when neither the current nor deprecated JVector native-vectorization property is configured.
Provider selection validation engine/src/test/java/com/arcadedb/utility/VectorApiSupportTest.java, engine/src/test/java/com/arcadedb/utility/JVectorProviderSelectionTest.java	Tests cover configuration defaults, property precedence, provider selection, platform conditions, native fallback, and isolated child-JVM execution.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix

Suggested reviewers: lvca

Merge Risk: ⚪ Minimal · up to 47a54

No actionable merge-blocking risk is established by the reviewed changes.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 31.82% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 22 functions across 4 files. (2 skipped: …	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Title check		The title clearly identifies the jvector upgrade and the related native-vectorization default.
Description check		The description explains the change, motivation, related issues, configuration behavior, testing, and untested scope. It does not reproduce the template headings or checklist, but it provides the requ…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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The description explains the change, motivation, related issues, configuration behavior, testing, and untested scope. It does not reproduce the template headings or checklist, but it provides the required information in substance.

Full details: Docstring Coverage

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Docstring coverage is 31.82% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 22 functions across 4 files. (2 skipped: 2 unsupported.)

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Write docstrings for the functions missing them to satisfy the coverage threshold.

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• 🪄 Fix comments: Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at
@engine/src/test/java/com/arcadedb/utility/JVectorProviderSelectionTest.java:
- Around line 105-106: Update nativeProviderSupportedHere() to account for
native-library load failures before expecting NativeVectorizationProvider: when
the supported Linux/Java/CPU conditions hold, detect the relevant JVector native
load failure (including noexec java.io.tmpdir) and allow
PanamaVectorizationProvider as the expected fallback; preserve native-provider
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• engine/pom.xml
• engine/src/main/java/com/arcadedb/GlobalConfiguration.java
• engine/src/main/java/com/arcadedb/utility/VectorApiSupport.java
• engine/src/test/java/com/arcadedb/utility/JVectorProviderSelectionTest.java
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[tae898]

The red Check License Compliance is not a license problem: its allow-list step passed ("OK: all 418 Maven dependency license(s) are on the allow-list"), and the job fails only in its last step, which tries to post a PR comment and gets Resource not accessible by integration because this PR comes from a fork.

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Up to standards ✅

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🟢 Metrics 4 complexity

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[robfrank]

@claude review

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---

Review of #10540: jvector 4.0.1 to 4.0.2, native vectorization off unless configured

I read the diff against origin/main. I did not build or run the tests, so everything below comes from reading the code. The PR description reports 977 vector-suite tests and 16 provider tests passing.

Verdict: the change is sound and small. I found nothing blocking.

• Read the diff for pom.xml, GlobalConfiguration, VectorApiSupport and both test classes
• Check the precedence logic against the stated contract
• Check the tests for flakiness and CLAUDE.md compliance

What looks good

• Precedence is correct. jvectorNativeVectorizationFor (VectorApiSupport.java) returns null when either the new property or the deprecated alias is set, so the user's value wins in both directions. Otherwise it returns the ArcadeDB setting, which defaults to false.
• Placement is correct. configureJVectorProvider() already runs before jvector resolves its provider, so the existing hook is reused. The GraalVM scalar-provider path is untouched.
• Setting definition fits. GlobalConfiguration uses SCOPE.JVM, default false, with a description that covers the requirements and the failure fallback.
• Pure decision function. The decision table is unit-tested in VectorApiSupportTest. The JVM-level behaviour is tested in JVectorProviderSelectionTest, which spawns a fresh JVM per case (jvector chooses once per JVM) and strips JAVA_TOOL_OPTIONS and similar so the parent's options don't leak into the child.
• Test style follows the repo. The tests use assertThat, and the only time bound is a 120 s hang detector (not a latency assertion), which matches the stall-aware-timing rule in CLAUDE.md.

Minor suggestions (non-blocking)

1. Log-text dependency in the tests. JVectorProviderSelectionTest.assertNativeOrLoggedFallback (around lines 98-104) matches jvector's literal log line "Native vector API was not enabled".
   • A reworded message in a later jvector release would fail those tests on every supported Linux host where native loading fails (for example a noexec tmpdir).
   • The pom.xml bump checklist is where a future bumper will look, so add a line there saying this test depends on that wording. Alternatively, drop the log check and accept isIn(NATIVE, PANAMA) on native-asked cases, at the cost of a weaker "property was ignored" signal.
2. Missing case: forced native provider. aForcedJVectorProviderWinsOverTheSetting only covers -Djvector.vectorization_provider=panama with the setting on. Adding provider=panama together with -Djvector.enable_native_vectorization=true would pin the claim that the provider property beats both.
3. Always writes a system property. After the first call the JVM always has jvector.enable_native_vectorization set, to "false" by default. That is the intended behaviour, but a second jvector consumer in the same JVM (an embedding application, a Gremlin or Polyglot user) cannot see that the value came from ArcadeDB. The GlobalConfiguration text covers "wins over this setting", but not "this setting writes the jvector property". One sentence in the description would help.
4. Constant visibility. JVECTOR_NATIVE_PROPERTY and JVECTOR_NATIVE_ALIAS_PROPERTY are public, but the neighbouring JVECTOR_PROVIDER_PROPERTY and JVECTOR_SCALAR_PROVIDER are package-private. Unless something outside the package needs them, making them package-private would match the file and keep the API surface small.
5. Test lane. JVectorProviderSelectionTest launches about 10 JVMs sequentially, with JIT warmup and jvector initialisation in each. If the engine unit-test lane gets noticeably slower, consider @Tag("slow"). This is not needed if CI time is fine.
6. Docs. I did not see a docs or config-reference entry for the new setting beyond the GlobalConfiguration description. If the repo generates the settings reference from that enum, nothing is needed.

CI note

I agree with the author's comment that the red Check License Compliance is the fork-token comment-posting failure. The allow-list step itself passed.

No new dependency was added, only a version bump of an existing one. The new native library inside the jvector jar is covered by the same Apache 2.0 artifact, but double-check that ATTRIBUTIONS.md and NOTICE don't need a Highway mention. I did not verify this.
| Branch: feat/jvector-402

[tae898]

Thanks for the review. 98a4366 takes the non-blocking suggestions:

1. The jvector bump checklist in engine/pom.xml now has a line saying JVectorProviderSelectionTest matches jvector's log text "Native vector API was not enabled" and that the wording must be re-checked on a bump. The log check stays.

2. New cases in aForcedJVectorProviderWinsOverTheSetting: -Djvector.vectorization_provider=panama with -Djvector.enable_native_vectorization=true, and with that property plus the setting on, both expect Panama.

3. The arcadedb.vectorIndex.nativeVectorization description now says that, when the jvector property is not set, the setting writes jvector.enable_native_vectorization (true or false) at startup, so other jvector users in the same JVM see its value.

4. JVECTOR_NATIVE_PROPERTY and JVECTOR_NATIVE_ALIAS_PROPERTY are package-private now; nothing outside VectorApiSupport used them (the tests use the literal names).

5. JVectorProviderSelectionTest is tagged @Tag("slow"), so the default unit-tests lane (-DexcludedGroups=slow,benchmark,vector) skips it and slow-unit-tests (-Dgroups=slow) runs it.

6. Docs: the repo has no settings reference generated from the enum, so there was nothing to update. NOTICE and ATTRIBUTIONS.md list jars (jvector is in ATTRIBUTIONS.md, as 4.0.0-rc.7) and no bundled native components of dependencies, so I added no Highway mention.

Local run of VectorApiSupportTest and JVectorProviderSelectionTest: 16 tests, 0 failures (Java 25, Linux x86_64).

CI on the previous run: the red unit-tests are Issue7089NaNTransparentSumAvgTest and Issue7139RetainedBackupNotDestroyedTest, which are also red on main's latest Java CI run (job 119091763852), plus PageSnapshotTest.barrierProducesAConsistentPointInTimeUnderConcurrentWriters and Issue10051Bm25CounterRepairTest, which are concurrency and crash-repair tests outside the vector code. The red integration-tests is Issue9326Issue9327Issue9328Issue9329SessionCommandsIT.statementTimeoutIsHonoured (timing-dependent, see #10166). python-e2e-tests is red on main too. vector-unit-tests and slow-unit-tests passed.

[tae898]

Measured the three jvector variants of this PR on an i9-12900HK host (mini), index build wall time, one fresh process per run, 2 pinned P-cores, ABBA rounds, round 0 dropped, scored with our ab.py (median of per-pair ratios, bootstrap 95% CI; a pair is dropped when its two arms differ by more than 5 C at start or by more than 1 point in throttled share of their own run time). Ratio > 1 means the second arm is slower.

workload	comparison	clean pairs	median ratio [95% CI]	verdict
ArcadeDB LSM_VECTOR build, NONE, 100k x 128-d	4.0.2, native off (this PR's default) vs jvector 4.0.1	19	0.988 [0.977, 1.001]	no detectable difference
ArcadeDB LSM_VECTOR build, NONE, 100k x 128-d	4.0.2, native vectorization on vs 4.0.2, native off (this PR's default)	14	1.256 [1.221, 1.286]	B worse by 22 to 29 percent
ArcadeDB LSM_VECTOR build, NONE, 100k x 128-d	4.0.2, native vectorization on vs jvector 4.0.1	12	1.237 [1.217, 1.269]	B worse by 22 to 27 percent
ArcadeDB LSM_VECTOR build, INT8, 100k x 128-d	4.0.2, native off (this PR's default) vs jvector 4.0.1	19	1.000 [0.997, 1.010]	no detectable difference
ArcadeDB LSM_VECTOR build, INT8, 100k x 128-d	4.0.2, native vectorization on vs 4.0.2, native off (this PR's default)	19	1.257 [1.249, 1.276]	B worse by 25 to 28 percent
ArcadeDB LSM_VECTOR build, INT8, 100k x 128-d	4.0.2, native vectorization on vs jvector 4.0.1	15	1.264 [1.250, 1.272]	B worse by 25 to 27 percent
jvector alone (GraphIndexBuilder), 100k x 128-d	4.0.2, native off (this PR's default) vs jvector 4.0.1	12	1.009 [0.979, 1.063]	no detectable difference
jvector alone (GraphIndexBuilder), 100k x 128-d	4.0.2, native vectorization on vs 4.0.2, native off (this PR's default)	9	1.245 [1.141, 1.301]	B worse by 14 to 30 percent
jvector alone (GraphIndexBuilder), 100k x 128-d	4.0.2, native vectorization on vs jvector 4.0.1	6	n/a	too few clean pairs (need >= 7)
LSM_VECTOR, 90k x 768-d	4.0.2, native off (this PR's default) vs jvector 4.0.1	18	1.008 [0.999, 1.012]	no detectable difference
LSM_VECTOR, 90k x 768-d	4.0.2, native vectorization on vs 4.0.2, native off (this PR's default)	7	0.986 [0.948, 1.020]	no detectable difference
LSM_VECTOR, 90k x 768-d	4.0.2, native vectorization on vs jvector 4.0.1	5	n/a	too few clean pairs (need >= 7)
LSM_VECTOR, 50k x 1536-d	4.0.2, native off (this PR's default) vs jvector 4.0.1	15	1.001 [0.998, 1.003]	no detectable difference
LSM_VECTOR, 50k x 1536-d	4.0.2, native vectorization on vs 4.0.2, native off (this PR's default)	6	n/a	too few clean pairs (need >= 7)
LSM_VECTOR, 50k x 1536-d	4.0.2, native vectorization on vs jvector 4.0.1	2	n/a	too few clean pairs (need >= 7)

Reading: with native vectorization on, 4.0.2 builds 22 to 29 percent slower than 4.0.1 or than 4.0.2 with it off at 128 dimensions (ArcadeDB NONE and INT8, and jvector alone 14 to 30 percent), so keeping it off unless configured is the right default. With it off, 4.0.2 is indistinguishable from 4.0.1 in every workload. At 768-d the native-on vs native-off cell has the minimum 7 clean pairs and shows no difference; the other high-dimension cells with native vectorization on kept too few clean pairs to judge: on this mobile CPU the native arm runs hotter and throttles a larger share of its run, which the pair rule drops, so those two cells stay open; we will rerun them on a setup that does not throttle.