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FT-2287: Apply split traffic override rules - #66
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Included review availability: This review used your included allowance. 4 included reviews remain after this review. Your included PR review attempts over the past 7 days set your current allowance at 5 reviews per hour. WalkthroughAudienceMatcher now returns validated assignment or split actions. Context resolves split percentages using experiment seeds and unit data. If the required unit is missing, Context assigns the full-on variant and records the missing-unit state. When the unit is added, eligible unexposed assignments can be re-resolved. Exposed assignments remain cached. Tests cover split-rule precedence, percentage validation, missing-unit handling, exposure, and holdout interaction. Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Feature Suggested reviewers: Merge Risk: 🔵 Low · up to Split rules with malformed percentage text, such as "50%/50%", might be accepted instead of skipped. This affects only unusual rule configuration, and the PR documents parseFloat as intended, so merge risk is low. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Actionable comments posted: 2
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Inline comments:
Review comments at @src/context.ts:
- Around line 517-523: Update AudienceMatcher.evaluateRules to accept the
experiment’s variant count and skip parsed split actions whose length differs
from that count, allowing later matching rules to be considered. Pass the count
from the caller in the context flow before _resolveRule processes the selected
action.
Review comments at @src/matcher.ts:
- Around line 11-12: Update the percentage token validation in the split-parsing
flow to reject tokens with trailing or otherwise invalid characters before
parsing, while accepting the full permitted syntax for non-negative signed
values and scientific notation. Then parse only tokens that pass full-token
validation.
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src/__tests__/context.test.jssrc/__tests__/matcher.test.jssrc/context.tssrc/matcher.ts
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CHANGES REQUESTED - Two reproduced split-rule cache regressions and two mutation-proven test findings need correction.
Reviewed head 7566350f27ca1afb6853c61ab2b878687fe761b1 against supplied base/merge-base d7c74b9727438ee7eb668413d2709bea38a5b896 (the intended holdout stack).
Intent and scope
This adds percentage-split assignment rules using experiment seeds, assign-rule precedence and exposure flags, and delayed-unit re-resolution for unexposed assignments. The actual diff affects matcher parsing, assignment-cache validation/invalidation, treatment selection and exposure publishing, plus their unit tests. Collector support and other SDKs are explicitly separate; older SDKs fall through to normal assignment. The author's current full-on decision is that rules win, matching assign rules. No rollout flag is added.
Findings
Four P2 inline findings: stale missing-unit metadata after a same-variant rule transition; an exposed fallback switching treatment and publishing conflicting exposures after an unrelated attribute update; two hashing tests surviving disabled split resolution; and the modified exception-fallback test surviving removal of exception recovery. These are separate from the existing bot threads, which were read and not duplicated.
Verification
npm ci --ignore-scripts,npm run generate-version,npm run format:check,npm run lint,npx tsc --noEmit: passed. Lint reports the existing client-test warning, no errors.npm test -- --runInBand: 37 suites, 501 tests passed.npm run compile,npm run build-es,npm run build-cjs,npm run build-browser: passed, including development and minified browser bundles; only the stale Browserslist-data advisory.- Independent runtime/simplicity and tests/CI/packaging passes; primary verification through a compiled-code harness reproduced both cache defects using public peek/treatment/unit/attribute methods and captured published exposure variants
[0, 1]. - Scratch production mutation disabling split resolution: the two named hashing tests passed unchanged (2/2), while the concentrated-split test failed with expected 1, received 2. Scratch mutation rethrowing condition errors: the named exception-recovery test passed unchanged (1/1), while a direct throwing-evaluator harness changed from fallback variant 2 to a propagated error. No tests were edited.
- Exact-head GitHub
formatandbuildchecks completed SUCCESS; CodeRabbit status SUCCESS. No pending CI limitation. - Introduced-blob helper completed successfully; all six content-write occurrences across the two commits were audited along with the head diff.
Passes
Passes (non-blocking): run: core runtime/API/security/data/error paths (split parser and assignment lifecycle); tests/CI/packaging (two test files and public SDK behavior); deployment/operations/observability (changed condition-error log); cross-cutting simplicity (new rule result and missing-unit state); comment hygiene; diff composition | not run: shared-component blast radius (no frontend component/hook/style changes), behaviour-bearing data/policy (no consumed configuration or policy files changed).
Comment hygiene
Comment hygiene (non-blocking): 3 comment / 270 code lines, ratio ~1:90, 0 blocks flagged.
threshold T=5; restatements counted: no (10 × C < E)
None flagged: the changed comment records the non-obvious duplicate-exposure constraint.
Diff composition
Diff composition (non-blocking): every file is required for the change; none flagged.
Simplifications
Simplifications (non-blocking): none.
Limitations
Collector integration, other-SDK parity and real deployment/adoption were not exercised and are not asserted; the reported defects are directly reachable in this SDK with valid split rules and documented late-unit/attribute APIs. No cloud queries, deployments or browser authentication were used. No PR source-branch changes were made.
An override rule can now split matched units across the experiment's variants instead of assigning one fixed variant. Matched units are hashed with the experiment's own seed, so a rule split equal to the experiment split keeps every unit on the variant it already had. A split rule otherwise behaves exactly like an assign rule: same precedence (beats holdouts, audience, traffic, full-on and custom assignments; loses only to override()) and same exposure flags. A split rule that matches while the unit is missing assigns variant 0 instead of falling through to a later rule, and is re-resolved once the unit is set. Malformed split rules are skipped like an invalid assign variant. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…unit Assign rules never need the unit, so evicting every unexposed rule override when a unit is set recomputed assign-rule assignments for nothing. Track whether the matched rule was a split resolved without its unit and evict only those. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The sum check rounds the gap from 100 to two decimals before comparing it with 0.01, the same check the backend applies to an experiment's own split, so gaps up to 0.0149... are accepted. Pin both sides of that boundary. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The assignment cache check re-resolved split rules on every attribute change but only compared the variant, which caused two problems: - Its missing-unit flag went stale when a split began matching on the same variant as the previous rule, so setting the unit later never re-resolved it. - Once the unit was set, an exposed split that had fallen back to variant 0 re-hashed to its real variant on the next attribute change, switching the user and queueing a second exposure. The cache check now refreshes the flag, and keeps resolving an exposed missing-unit split as if the unit were still absent. Also tighten tests the review showed could pass without the behaviour they name: pick a split where experiment-seed hashing, traffic-seed hashing and normal assignment disagree; make the condition-error test actually throw; and pin that a split with the wrong value count stops rule evaluation. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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CHANGES REQUESTED - A lower-priority custom assignment still bypasses the exposed missing-unit split pin and produces conflicting exposures.
Reviewed round 2 at head 01f08993fc3c869a5cd0eea4526d5a25ffb62922 against supplied base/merge-base 381a248bf094c97d9fbdf109630b27a1365e290d.
Intent and scope
Split assignment rules use experiment seeds, assign-rule precedence and exposure flags, and late-unit re-resolution only before exposure. The diff affects parsing, treatment selection, assignment cache lifecycle and exposure publishing, plus unit tests. Collector and other-SDK support are explicitly separate; no rollout flag is added. The owner's declared wrong-count fallback, lenient parsing and current rule-over-full-on precedence are intentional contracts.
Findings and follow-up
One P2 inline finding: an existing custom assignment that loses to a split rule forces cache replacement, discarding the exposed fallback pin. The round-1 same-variant metadata sequence and unrelated-attribute sequence now pass their regression tests. The replacement hashing test fails with disabled split resolution (expected 1, received 2), and the exception-recovery test fails when the catch rethrows. Those test findings are satisfied. The exposed-fallback acceptance invariant remains incomplete through the custom-assignment route described inline, so this is not a clean follow-up and the supplied prior change-request review was not dismissed. No duplicate comments were posted on the corrected sequences.
Verification
npm ci --ignore-scripts,npm run generate-version,npm run format:check,npm run lint,npx tsc --noEmit: passed. Lint has one existing client-test warning and no errors.npm test -- --runInBand: 37 suites, 507 tests passed, including split parsing/tolerance, precedence, exposure flags, holdouts and late-unit regressions.npm run compile,npm run build-cjs,npm run build-es,npm run build-browser: passed, including development and minified browser bundles; stale Browserslist-data advisory only.- Independent runtime/simplicity and tests/CI/packaging/observability passes. Primary compiled CommonJS SDK harness used public createContextWith/customAssignment/treatment/unit/publish APIs: without a custom assignment, treatments 0 → 0 and exposure variants
[0]; with a pre-existing custom assignment, treatments 0 → 1 and published exposure variants[0, 1]. No experiment, rule or attribute change was needed. - Unmodified focused tests run against scratch production mutations: disabled split resolution made the experiment-seed test fail; rethrowing condition errors made the exception-fallback test fail.
- Exact-head GitHub
formatandbuildchecks completed SUCCESS; CodeRabbit status SUCCESS. No CI deferral. - Introduced-blob helper completed successfully: all 10 content-write occurrences across four PR commits were audited along with the head diff.
Passes
Passes (non-blocking): run: core runtime/API/security/data/error paths (split parser and cache lifecycle); tests/CI/packaging (public SDK behavior and two test files); deployment/operations/observability (changed condition-error warning); cross-cutting simplicity (rule-result and missing-unit state); comment hygiene; diff composition | not run: shared-component blast radius (no frontend components, hooks or styles changed), behaviour-bearing data/policy (no consumed configuration or policy files changed).
Comment hygiene
Comment hygiene (non-blocking): 9 comment / 338 code lines, ratio ~1:37.6, 0 blocks flagged.
threshold T=5; restatements counted: no (10 × C < E)
None flagged: comments record duplicate-exposure constraints, discriminating seed fixtures and external tolerance semantics.
Diff composition
Diff composition (non-blocking): every file is required for the change; none flagged.
Simplifications
Simplifications (non-blocking): none.
Limitations
Collector integration, other-SDK parity and production deployment/adoption were not exercised or asserted. The blocker is directly reproduced within the SDK using its documented public lifecycle. No cloud queries, deployments or browser authentication were used, and no PR source-branch changes were made.
…out its unit Without its unit a matched split rule fell back to variant 0, while a user who matched no rule on a full-on experiment got the full-on variant, so the rule made the outcome worse than having no rule. Fall back to the experiment's own no-unit result instead: the full-on variant, or 0 when the experiment is not full-on. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…ent differs A custom assignment that lost to a matching rule made every treatment() call rebuild the assignment, resetting `exposed` and queueing duplicate exposures (also on main), and skipping the exposed missing-unit split pin. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Makes the unknown-type fallback an explicit default and leaves one place to add further rule types. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Verified at 2c82256: all prior cache lifecycle and mutation-test acceptance criteria are satisfied in round 3.
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APPROVED - The prior acceptance criteria are satisfied, no blocker survives, and exact-head validation passes.
Reviewed round 3 at head 2c82256f3189bb674e8e86ac6e2f8810e5ea6cbb against base/merge-base 381a248bf094c97d9fbdf109630b27a1365e290d.
Scope and follow-up
Split override rules use experiment seeds and assign-rule precedence/exposure flags. The four-file diff affects matcher parsing, treatment selection, assignment-cache lifecycle and exposure publishing, plus their tests. The latest changes preserve rule-won assignments despite a losing custom assignment, use the full-on variant for missing-unit fallbacks, and switch action dispatch on rule type.
All earlier acceptance criteria are satisfied: same-variant rule transitions refresh missing-unit metadata; unexposed split fallbacks re-resolve when the unit arrives; exposed fallbacks remain pinned through unrelated attributes and losing custom assignments, publishing one exposure; the replacement hashing and exception-recovery tests detect removal of the behavior they claim. Genuine attribute/rule revalidation remains intact, including returning to the custom assignment when the rule stops matching. No new verified findings or material unknowns remain.
Verification
npm ci --ignore-scripts,npm run generate-version,npm run format:check,npm run lint, andnpx tsc --noEmit: passed. Lint retains one existing client-test warning, with no errors.npm test -- --runInBand: 37 suites, 510 tests passed, including parsing/tolerance boundaries, precedence, exposure flags, holdouts and late-unit cache regressions.npm run compile,npm run build-es,npm run build-cjs, andnpm run build-browser: passed, including development and minified browser bundles; stale Browserslist-data advisory only.- Primary compiled CommonJS public-API harness exercised createContextWith/customAssignment/treatment/unit/attribute/publish/finalize: ordinary and full-on missing-unit fallbacks stayed on their original variants and published exactly one exposure after the unit and an unrelated attribute were added. Independent runtime and test/packaging passes also checked lifecycle and coverage.
- Unmodified focused tests against scratch production mutations: removing the ruleOverride cache exemption failed both new custom-assignment regressions (duplicate pending exposure and treatment switching from 0 to 1); disabling split resolution failed the experiment-seed test (expected 1, received 2); rethrowing condition errors failed the exception-fallback test. Tests were not edited.
- Exact-head GitHub build and format checks completed successfully; CodeRabbit status also passed. Head/base were rechecked before submission.
- Introduced-blob helper completed successfully; 15 content-write occurrences across seven commits were audited along with the cumulative diff.
Passes
Passes (non-blocking): run: core runtime/API/security/data/error paths (split parsing and cache lifecycle); tests/CI/packaging (two test files and observable SDK behavior); deployment/operations/observability (changed condition-error warning); cross-cutting simplicity (rule results and missing-unit state); comment hygiene; diff composition | not run: shared-component blast radius (no frontend components, hooks or styles changed), behaviour-bearing data/policy (no consumed configuration or policy files changed).
Comment hygiene
Comment hygiene (non-blocking): 11 comment / 404 code lines, ratio ~1:36.7, 0 blocks flagged.
threshold T=5; restatements counted: no (10 × C < E)
None flagged: comments preserve non-obvious duplicate-exposure constraints, discriminating seed fixtures and external tolerance semantics.
Diff composition
Diff composition (non-blocking): every file is required for the change; none flagged.
Simplifications
Simplifications (non-blocking): none.
Boundaries
Approval covers this JavaScript SDK change, not collector integration, other-SDK ports or production adoption. Those are explicitly separate. The author's intentional lenient parsing, wrong-count stop-and-normal-fallback behavior and current rule-over-full-on precedence were checked against the implementation and discussion; the broader product question does not leave this head's intended contract undefined. No cloud queries, deployment commands or browser authentication were used. No PR source-branch changes were made. The two supplied prior change-request reviews are superseded because their acceptance criteria now pass.
| const isInBounds = action.variant >= 0 && action.variant < variantCount; | ||
| return isInBounds ? { variant: action.variant, isMissingUnit: false } : null; | ||
| } | ||
| if (action.split.length !== variantCount) return null; |
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Question on the wrong-count case (should fall back to normal assignment without trying later rules when the split does not cover every variant):
I see why it behaves this way. evaluateRules returns the first matching action and can only check what's on the rule itself, so the variant-count check ends up here in _resolveRule, after the matcher has already stopped. That matches main, where an out-of-bounds assign variant also stops evaluation and falls back to normal assignment.
But it leaves us with two kinds of malformed rule that behave differently:
- bad sum (
50/40): skipped, later rules still apply - wrong count (
0/100on a 3-variant experiment): evaluation stops, normal assignment
Someone writing rules wouldn't expect that difference. A small fix would be to pass variantCount into evaluateRules and do the bounds/count check inside the matcher loop, so every malformed rule continues. That changes assign-rule behaviour too, though, so it would need to land in the collector and the other SDKs at the same time.
I'm fine matching main in this PR. Can we open a cross-SDK ticket to make every malformed rule skip to the next one? It's also worth confirming whether the backend already rejects wrong-count splits when they're saved, which would make this mostly theoretical.
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Checked the backend (absmartly/abs#5319). It already blocks both malformed split cases at save time:
- Wrong count:
validateSplitRuleArityrejects a split that doesn't have one value per variant ("Every assignment rule split must have one value per variant"). It runs on create, full and partial updates (against the merged stored rules andnr_variants), lifecycle transitions and templates with locked rules.nr_variantscan't change once the experiment is running, so the count can't drift afterwards. - Bad sum: the rules schema rejects percentages that don't sum to 100.
So for split rules, the skip-vs-stop difference can't be reached in practice.
Assign rules aren't covered. The schema only requires variant to be a whole number ≥ 0 and never compares it with nr_variants, on main or in #5319. An assign rule with variant: 5 on a 3-variant experiment saves fine and then stops evaluation in the SDK, which is the inconsistency you describe.
I'll keep matching main here, as you suggested, and follow up on the assign case separately.
Summary
Override rules (
assignmentRules) gain asplitaction alongsideassign:{ "type": "split", "percentages": "20/30/50", "conditions": { ... }, "environments": [] }Matched units are distributed across the experiment's variants by the rule's percentages and, like
assign, are excluded from analysis.seedHi/seedLo, so no payload change is needed. A rule whose split equals the experiment split keeps every unit on the variant it would have had anyway. Matched units are not analysed, so independence from the main split isn't needed.assign. A split rule beats holdout suppression, audience/audienceStrict, traffic eligibility, full-on and custom assignments; onlyoverride()beats it. Exposures carryruleOverride: true,assigned: false,eligible: true.mainand in the collector. Making both continue would change shipped behaviour and is a cross-SDK decision.validatePercentageSplitCompleteness) and to split rules (isPercentagesSumComplete): the gap from 100, rounded to two decimals, must be ≤ 0.01. So50/50.014is accepted and50/50.015is skipped.parseFloat(value) / 100with no normalisation; any rounding remainder goes to the last variant (chooseVariant). Other SDKs and the collector must parse identically.Also fixes a bug on
mainWhen a matching rule won over a different
customAssignment(), the assignment cache treated the custom mismatch as stale and rebuilt the assignment on everytreatment()call. Each rebuild resetexposed, so every call queued another exposure. This affects assign rules onmaintoday. A rule-won assignment is now reused like a holdout-suppressed one, and rule or attribute changes still revalidate it. Other SDKs should check for the same bug when porting; the collector has no custom assignments, so it is not affected.Open product question
Whether a split rule should still apply once an experiment is full-on. For now it behaves exactly like an assign rule (rule wins).
Out of scope
Test plan
npx jest: 510/510npx tsc --noEmitnpm run lint: no errors; one existing warning inclient.test.jsnpm run format:check🤖 Generated with Claude Code
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