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fix(usage): yield between costly ledger rows - #8455
Full usage-ledger scans yield only after a complete read chunk. Byte and row counts do not bound the time spent normalizing records and updating an accumulator: even a small final chunk can monopolize the serving event loop and prevent /healthz from answering the CLI's liveness probe.
Check a monotonic 8 ms budget between completed rows, alongside the 1,000-row limit, and yield within the final chunk as well. Recheck cancellation immediately after that yield. Existing byte bounds, checkpoint/digest validation, row ordering and snapshot semantics are retained. One record remains atomic; this does not promise a hard real-time deadline under arbitrary system load.
Two deterministic regressions advance a controlled monotonic clock while exercising the real scanner and timer queue. They fail before the change and cover progress by unrelated callbacks and cancellation before all rows in a single read are consumed. Update the usage contract and management API documentation.
This addresses a separate blocking path from #8337 and its HTTP regression #8450; it does not replace the Keychain fix.
Verification
Current-head validation at fcd6acbbcd51087bfbc99cdabd32438b04556d69, after integrating dev081f64169f7e57624bed878d0494c3f7061d49a0: bun scripts/test.ts --changed=origin/dev tests/usage/usage-ledger-scanner.test.ts tests/usage/usage-aggregate-cache.test.ts tests/usage/usage-failure-projection.test.ts tests/server/api-usage.test.ts --parallel=1 — 102 pass, 0 fail across the explicit four-file changed-mode selection. bun run typecheck passes (2,409 files), as do bun run privacy:scan, bun run structure:check, and the 38 layout/tooling/file-size tests. The docs build (cd docs-site && bun install --frozen-lockfile && bun run build) passes with 665 pages and 96,086 internal links checked. git diff --check origin/dev passes. Product changes are unchanged by the base refresh; CodeRabbit's prior review on e9d46cbd had no actionable findings.
Validation scope remains focused: no new full import-connected or cross-platform run was launched. The earlier interrupted runs below remain incomplete; they are not passing-suite evidence. The earlier documentation build and live/negative-control experiments are historical measurements from the initial patch, not rerun claims for this head.
Earlier patch validation and diagnostic experiments:
Before the fix, both new regression tests fail; afterward, bun test tests/usage/usage-ledger-scanner.test.ts passes (23 tests).
bun test tests/usage/usage-ledger-scanner.test.ts tests/usage/usage-aggregate-cache.test.ts tests/usage/usage-failure-projection.test.ts tests/server/api-usage.test.ts — 102 pass, 0 fail.
bun run typecheck — no errors in 2,376 files.
bun run privacy:scan and bun run structure:check — pass.
bun test tests/test-layout.test.ts tests/ci-workflows/file-size-ratchet.test.ts — 11 pass, 0 fail.
cd docs-site && bun install --frozen-lockfile && bun run build — pass; 665 pages built and 95,869 internal links checked.
Controlled HTTP experiment with the scanner in a separate Bun process: 40 records with a 50 ms synchronous callback each, all fitting within one chunk. The original scanner misses the 750 ms /healthz deadline; the changed scanner responds in 10 ms (88 ms in the installed-runtime repetition) and processes all 40 records. No real credentials or upstream requests are used by this experiment.
Resource exception: bun scripts/test.ts --changed=HEAD --parallel=1 was attempted, then interrupted after more than 3,600 passing tests and no reported failures. The shared Mac was already heavily contended (load average exceeded 600 during diagnosis), and extended testing interfered with the live proxy. This interrupted run is not passing-suite evidence. The complete import-connected suite and cross-platform coverage remain for CI; no manual full-CI workflow was dispatched.
A local production trial initially passed 50 health probes (maximum 41 ms) and three quota CLI reads. A later scan under concurrent heavy testing still missed some health deadlines; this patch fixes the demonstrated scanner scheduling defect, not every possible synchronous callback or OS scheduling stall.
git diff --check — pass.
Checklist
Scope stays focused and avoids unrelated cleanup.
Docs or release notes were updated when needed.
Security-sensitive changes were reviewed for secrets, auth, and unsafe defaults.
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Summary by CodeRabbit
Improvements
Cold usage-ledger scans now yield between completed records after 8 ms, or between chunks after 1 MiB or 1,000 rows—even within the final chunk. This helps health checks and other local requests continue during long scans. Each record is processed atomically, and scans check for cancellation after yielding.
Documentation
Updated usage-ledger guidance to describe scan yielding and cancellation checks.
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The usage-ledger scanner now yields after a complete row when at least 8 ms have elapsed, including within the final chunk. It checks for cancellation after yielding and resets scan-slice counters. The existing chunk yield remains in place.
Changes: Usage-ledger scanning
Layer / File(s)
Summary
Timed yields and cancellation checks src/usage/ledger-scanner.ts, tests/usage/usage-ledger-scanner.test.ts, docs-site/src/content/docs/reference/management-api.md, structure/dashboard-and-usage.md
The scanner yields after a complete row when at least 8 ms have elapsed. It retains the existing yield after 1 MiB or 1,000 rows and resets scan-slice counters after yielding. Tests cover yielding during a single read, checkpoint digest consistency, and cancellation during a yield. Documentation describes the yield thresholds and atomic row processing.
lidge-jun/opencodex#8391: Its filtered-index ingestion uses scanUsageLedgerCooperatively, which this change updates.
lidge-jun/opencodex#8435: Its streaming ledger rebuild fallback uses the cooperative scanner updated here.
Merge Risk: Low · up to 2349d
The scanner change should not alter runtime behavior beyond yielding more often. One existing checkpoint test may fail intermittently on slow hosts because it now depends on timing. Pin the clock in that test before merging to avoid flaky CI.
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The title clearly and concisely describes the main change: adding cooperative yields between costly usage-ledger rows.
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A per-row 1,000-row check yielded several times per chunk of cheap rows and
made cold scans of large ledgers slower than dev. The row limit stays at the
chunk boundary; inside a chunk only the 8 ms budget yields. Assert that a
paused scan publishes the same checkpoint digest as an unpaused one.
Co-authored-by: seedds <seedds@gmail.com>
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Some comments are outside the diff and can’t be posted inline due to GitHub limitations.
⚠️ Outside diff range comments (1)
Minor · Make the checkpoint test independent of elapsed-time yields. · usage-ledger-scanner.test.ts:476
tests/usage/usage-ledger-scanner.test.ts:476 Minor · Functional Correctness · Quick win
Make the checkpoint test independent of elapsed-time yields.
This existing trigger now depends on host timing. If the first row reaches the 8 ms threshold, src/usage/ledger-scanner.ts Line 407 performs the third signal.aborted read. Line 429 then performs the fourth read and rewrites the ledger before revision validation. Validation detects the changed content and rejects the scan, although this test expects success.
Without the elapsed-time yield, the fourth read occurs at Line 469, after validation, as this test requires. A loaded host can therefore make this test fail intermittently.
Stub performance.now() to a constant for this test and restore the spy in finally. Keep the new controlled-clock tests responsible for elapsed-time scheduling coverage.
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Review comment at @tests/usage/usage-ledger-scanner.test.ts at line 476:
Make the checkpoint test that uses abortChecks deterministic by stubbing performance.now() to return a constant for the duration of the test and restoring the spy in a finally block. Keep elapsed-time scheduling coverage in the separate controlled-clock tests.
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Outside diff comments:
Review comments at @tests/usage/usage-ledger-scanner.test.ts:
- Line 476: Make the checkpoint test that uses abortChecks deterministic by
stubbing performance.now() to return a constant for the duration of the test and
restoring the spy in a finally block. Keep elapsed-time scheduling coverage in
the separate controlled-clock tests.
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Reviewing files that changed from the base of the PR and between fcd6acb and 2349db4.
Files selected for processing: 3
src/usage/ledger-scanner.ts
structure/dashboard-and-usage.md
tests/usage/usage-ledger-scanner.test.ts
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Value: Keeps /healthz and other local requests responsive while a cold usage-ledger scan runs. On dev the cooperative scanner only yielded between 1 MiB read chunks, so a ledger whose rows fit in one chunk, or the final chunk of any ledger, ran every normalization/aggregation callback in one synchronous stretch. The two new scanner tests fail on dev (21 pass / 2 fail with dev's src/usage/ledger-scanner.ts) and pass here.
Maintainer change (2349db4): an independent review measured that checking the 1,000-row limit after every row made cold scans of cheap rows about 65% slower than dev (200k rows: 556–618 ms vs 350–410 ms). Inside a chunk the scanner now yields only on the 8 ms budget; the row and byte limits stay at the chunk boundary. The reviewer's measurement of that variant was 325–343 ms. The first test also asserts that a paused scan publishes the same checkpoint digest as an unpaused one. Branch merged with dev39fd819.
UX change: none visible; usage reports compute the same totals. Health checks and dashboard calls stop stalling during a large scan.
Existing users: no data or format change; checkpoint digests and row ordering are unchanged. Slow-row scans pay about one timer tick per 8 ms of work.
Windows: platform-neutral code; the yield uses the same setTimeout(0) the scanner already used between chunks.
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Decouple the checkpoint fixture from abort-check counts
On a contended worker, if the single-row checkpoint fixture crosses the 8 ms budget, this extra cancellation check moves its fourth signal.aborted read before revision validation instead of after it. The getter in tests/usage/usage-ledger-scanner.test.ts:472-477 consequently rewrites the ledger at the wrong stage, and the checkpoint test rejects with content_changed, making the suite timing-dependent. With config-directory lookup isolated, the existing test fails under a controlled advancing clock on this commit and passes on its parent. Keep the cancellation check, but pin the clock in that fixture or replace its read-count trigger with an explicit post-validation seam.
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Summary
Full usage-ledger scans yield only after a complete read chunk. Byte and row counts do not bound the time spent normalizing records and updating an accumulator: even a small final chunk can monopolize the serving event loop and prevent
/healthzfrom answering the CLI's liveness probe.Check a monotonic 8 ms budget between completed rows, alongside the 1,000-row limit, and yield within the final chunk as well. Recheck cancellation immediately after that yield. Existing byte bounds, checkpoint/digest validation, row ordering and snapshot semantics are retained. One record remains atomic; this does not promise a hard real-time deadline under arbitrary system load.
Two deterministic regressions advance a controlled monotonic clock while exercising the real scanner and timer queue. They fail before the change and cover progress by unrelated callbacks and cancellation before all rows in a single read are consumed. Update the usage contract and management API documentation.
This addresses a separate blocking path from #8337 and its HTTP regression #8450; it does not replace the Keychain fix.
Verification
fcd6acbbcd51087bfbc99cdabd32438b04556d69, after integratingdev081f64169f7e57624bed878d0494c3f7061d49a0:bun scripts/test.ts --changed=origin/dev tests/usage/usage-ledger-scanner.test.ts tests/usage/usage-aggregate-cache.test.ts tests/usage/usage-failure-projection.test.ts tests/server/api-usage.test.ts --parallel=1— 102 pass, 0 fail across the explicit four-file changed-mode selection.bun run typecheckpasses (2,409 files), as dobun run privacy:scan,bun run structure:check, and the 38 layout/tooling/file-size tests. The docs build (cd docs-site && bun install --frozen-lockfile && bun run build) passes with 665 pages and 96,086 internal links checked.git diff --check origin/devpasses. Product changes are unchanged by the base refresh; CodeRabbit's prior review one9d46cbdhad no actionable findings.Earlier patch validation and diagnostic experiments:
bun test tests/usage/usage-ledger-scanner.test.tspasses (23 tests).bun test tests/usage/usage-ledger-scanner.test.ts tests/usage/usage-aggregate-cache.test.ts tests/usage/usage-failure-projection.test.ts tests/server/api-usage.test.ts— 102 pass, 0 fail.bun run typecheck— no errors in 2,376 files.bun run privacy:scanandbun run structure:check— pass.bun test tests/test-layout.test.ts tests/ci-workflows/file-size-ratchet.test.ts— 11 pass, 0 fail.cd docs-site && bun install --frozen-lockfile && bun run build— pass; 665 pages built and 95,869 internal links checked./healthzdeadline; the changed scanner responds in 10 ms (88 ms in the installed-runtime repetition) and processes all 40 records. No real credentials or upstream requests are used by this experiment.bun scripts/test.ts --changed=HEAD --parallel=1was attempted, then interrupted after more than 3,600 passing tests and no reported failures. The shared Mac was already heavily contended (load average exceeded 600 during diagnosis), and extended testing interfered with the live proxy. This interrupted run is not passing-suite evidence. The complete import-connected suite and cross-platform coverage remain for CI; no manual full-CI workflow was dispatched.git diff --check— pass.Checklist
Review readiness checklist
This PR stays in draft until every box below is ticked. Tick all four boxes once the requirements are met:
Required local validation passed; commands, results, and any full-suite exception are documented.
I pushed my PR to a recent dev commit (at most 10 behind; a maintainer may still ask for the exact tip before merge).
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My PR is ready for review.
Ready for technical review. The prior CodeRabbit review had no actionable findings; the updated head is available for fresh automated review. Required GitHub CI and maintainer review remain pending.
Summary by CodeRabbit