fix(db): replace fragmented join demand in background - #1903
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ChangesSubset demand replacement
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant DemandCaller
participant SubsetDemandController
participant Subscription
DemandCaller->>SubsetDemandController: setDemand with current keys
SubsetDemandController->>Subscription: requestSnapshot for full key union
Subscription-->>SubsetDemandController: result and release callback
SubsetDemandController->>SubsetDemandController: establish current replacement
SubsetDemandController->>Subscription: release prior acquisition
SubsetDemandController-->>DemandCaller: resolve readiness
Merge Risk: ⚪ Minimal · up to The supplied evidence identifies no outstanding issue that should delay merging after normal checks. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The replacement design preserves existing coverage during a successful transition, and no new access-control exposure was identified. One bounded availability risk remains if an adapter does not finish an aborted request: newer demand can wait behind it. Retained concerns
Security review detailsSecurity Blast Radius
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🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
✅ Passed checks (3 passed)
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Actionable comments posted: 1
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
In @packages/db/src/query/live/subset-demand-controller.ts:
- Around line 181-190: Update `advance` to distinguish calls from `setDemand`
from follow-up calls in `finishReplacement` and `failReplacement`: preserve the
synchronous throw for the direct caller, but on the promise-callback path
release the acquisition, reject the current generation’s waiter, and return
without throwing. Add a test where a synchronous `loadSubset` throw occurs
during the follow-up replacement and verify the latest generation’s `ready`
promise rejects.
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.changeset/replace-fragmented-join-demand.mdpackages/db/src/query/live/ARCHITECTURE.mdpackages/db/src/query/live/subset-demand-controller.tspackages/db/tests/query/includes-temporal-oracle.test.ts
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Actionable comments posted: 1
- 🪄 Fix CodeRabbit comments on this PR
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only still-valid issues, skip the rest with a brief reason, keep changes
minimal, and validate.
Inline comments:
In @packages/db/src/collection/subscription.ts:
- Around line 1300-1301: Update the acquisition release callbacks to capture the
acquisition they started, and pass it to releaseDemand. Ignore a primary failure
when that captured acquisition is no longer demand.acquisition, while keeping
failure-free releases bound to the logical demand so they still release its
current acquisition.
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packages/db/src/collection/subscription.tspackages/db/tests/collection-auto-index.test.tspackages/db/tests/query/load-subset-join-dedupe.test.tspackages/db/tests/query/load-subset-source-readiness-refinement-oracle.test.ts
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Summary
Lazy join demand previously accumulated remote subset subscriptions as a bounded window changed.
This change keeps the existing segment model and adds targeted background consolidation:
This avoids both the fragmented-subscription drift from #1887 and the cumulative
1 + 2 + … + Nkey loading caused by replacing the full union on every expansion.Scope and code weight
The implementation stays inside the existing segment abstraction. It does not add a second generation/waiter lifecycle or change
CollectionSubscription.+815 / -156across 9 files+409 / -60across 5 files; the final increase is oracle evidence and its coverage record, with no production-code changemain)This PR does not add an adapter strategy API, custom string comparison, collation-aware predicates, or cursor pagination.
Contract
Growth is delta-only. A churn replacement owns the complete current union, but it becomes authoritative only after applied settlement. Until then, prior intersecting segments continue to own coverage.
Verification
[]instead of[200, 300]).@tanstack/dboracle campaign: 2,171 tests passed with no type errors@tanstack/dbruntime suite: 6,434 tests passed@tanstack/dbproduction build passed@tanstack/dbESLint passedThe local full-suite command also surfaced four existing type-check diagnostics in the untouched
subset-error-matrix.test.ts; this PR does not change that file.Closes #1887