Apply usage-index Stores per parse batch - #351
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📝 WalkthroughWalkthroughCharts now process Claude and Codex transcript records in bounded batches. ChangesBatched transcript indexing
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to The scan now persists index updates in batches, but test runs can still write those updates to the developer’s normal on-disk usage index instead of an isolated test location. That can alter local index data and should be fixed before merging. Sequence Diagram(s)sequenceDiagram
participant ClaudeOrCodexScanner
participant for_each_indexed_file
participant IndexStore
participant SnapshotFile
ClaudeOrCodexScanner->>for_each_indexed_file: provide indexed transcript files
for_each_indexed_file->>for_each_indexed_file: parse and fold bounded batch
for_each_indexed_file->>IndexStore: apply parsed entries
for_each_indexed_file->>IndexStore: persist touched paths
IndexStore->>SnapshotFile: write final snapshot
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## Summary
- `IndexStore::commit` encoded under the write lock, then dropped it
before `atomic_write`. Two Charts cards (API value and heatmap) scan at
the same time; the slower writer could put its older snapshot over the
later one.
- The write guard now stays held through the file replace, so encode
order and write order match (SBS-948).
- A user who opens Charts, lets both cards finish, then restarts no
longer gets a surprise cold parse of files the faster scan had just
indexed. In-memory totals were already correct.
Closes nothing on GitHub. Linear SBS-948.
## Test plan
- [x] `a_later_commit_is_not_overwritten_by_an_earlier_snapshot` — two
threads commit different files; after the first encoder is paused, the
second still has to be on disk when both finish (the snapshot a restart
would load).
- [x] Fail-without-fix: restored only `drop(guard)` after encode. Test
failed with `second scan's file must not have been overwritten`.
Production lock hold restored; test passes.
- [ ] Open Charts so Estimated API value and the heatmap scan together,
restart, and confirm both cards still hit the index for files they just
parsed.
## Quality gate (`.github/workflows/ci.yml` rust-shared)
```
cargo fmt --all --check
# exit 0
```
```
cargo test --manifest-path rust/Cargo.toml --lib usage_index::tests::a_later_commit_is_not_overwritten_by_an_earlier_snapshot
# ok (0.11s)
```
Fail-without-fix (`drop(guard)` after encode, test only):
```
thread 'usage_index::tests::a_later_commit_is_not_overwritten_by_an_earlier_snapshot' panicked at rust/src/usage_index.rs:1107:9:
second scan's file must not have been overwritten
test usage_index::tests::a_later_commit_is_not_overwritten_by_an_earlier_snapshot ... FAILED
```
```
cargo test --manifest-path rust/Cargo.toml
# 1066 passed; 6 failed, all pre-existing Linux path assumptions (CI is windows-latest):
# codex_sessions::tests::normalizes_codex_root_to_sessions_dir
# left: Some("\\\\wsl.localhost\\archlinux\\home\\kk\\.codex/sessions")
# right: Some("\\\\wsl.localhost\\archlinux\\home\\kk\\.codex\\sessions")
# grok_costs::tests::{parses_turn_completed_with_cache_and_reasoning,
# bare_turn_completed_without_usage_still_attributes_project,
# project_name_from_encoded_session_path_when_summary_missing,
# subagent_tokens_used_when_usage_block_missing}
# left: Some("C:\\projects\\personal\\…")
# right: Some("ceiling" | "toolport")
# cost_scanner::tests::grok_report_rolls_up_tokens_cache_effort_and_project
# report.thirty_days.by_project_tokens missing "ceiling"
# New test: ok
```
```
cargo clippy --manifest-path rust/Cargo.toml --all-targets -- -D warnings
# Linux-only, pre-existing, not in this diff (CI rust-shared is windows-latest):
# rust/src/secure_file.rs:489 unused variable `error`
# rust/src/updater.rs:514 unused `verify_installer_signature_or_delete`
# Same command with those two allows: exit 0
```
Frontend and rust-desktop were not run: this diff is shared rust only.
## Pattern sweep
```
python walk of rust/**/*.rs for drop(guard) / encode-then-drop-then-atomic_write
# drop(guard): none remaining after this fix
# encode + drop + atomic_write in a 20-line window: none
# drop(lock) at secure_file.rs:1636 is a test dropping a lock handle, not this pattern
```
Other `atomic_write` sites (widget snapshot, models.dev cache, jsonl
cache, credentials) do not encode a lock-protected in-memory snapshot
and then release before persist.
## What this makes more likely
A slow or hung disk write now blocks the other card from taking the
write lock and also blocks new `read()`s. Encode was already under the
write lock; this extends that hold across `create_dir_all` +
`atomic_write`. The ticket allowed that, or a separate persist mutex.
This PR takes the simpler of the two.
## Leftovers
- SBS-951 (#351) splits `commit` into `apply` + `persist`. `persist`
still encodes then releases before write. After that lands, persist
needs the same hold-across-write. Not this ticket; merge conflict on
`usage_index.rs` is expected.
- Did not add a separate persist mutex.
- Did not invent a Linux harness for the six Windows path tests or the
two Windows-only clippy items.
- `target/` deleted after tests.
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> [!NOTE]
> ### Fix race in `IndexStore.commit` where concurrent chart scans could
overwrite the usage index with an older snapshot
> When two chart scans committed concurrently, the write lock was
released before `atomic_write`, allowing an earlier snapshot to
overwrite a later one on disk. The fix holds the write lock through the
file write in
[usage_index.rs](https://github.com/tsouth89/ceiling/pull/359/files#diff-573151345c6502ce27bc19e2085b0e4b32ec729e713e155ce718bd0f69e5da7a),
ensuring the latest snapshot always wins. A new concurrency test
reproduces the race using a controlled post-encode pause.
>
> <!-- Macroscope's review summary starts here -->
>
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98b2100.</sup>
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>
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<!-- CURSOR_SUMMARY -->
---
> [!NOTE]
> **Medium Risk**
> Touches concurrent persist of the Charts usage index: a hung disk
write now blocks other commits and new reads. Persistence and restart
behavior are affected, but the change is a small lock-scope fix with a
dedicated race test.
>
> **Overview**
> Stops concurrent Charts scans from clobbering the on-disk usage index.
`IndexStore::commit` used to encode under the write lock, then drop it
before `atomic_write`, so the slower of the API-value and heatmap scans
could write an older snapshot and force a cold re-parse after restart.
>
> The write guard now stays held through the file replace, so disk
always matches the latest encode. In-memory totals were already correct.
A concurrency test pauses after encode to prove a later commit is not
overwritten.
>
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
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Inline comments:
In `@rust/src/cost_scanner.rs`:
- Around line 3571-3595: Update the index path resolution used by CLAUDE_INDEX
and CODEX_INDEX so path() uses the Settings::settings_path() fallback only under
cfg(not(test)); under cfg(test), return only path_override. Preserve normal
production behavior while preventing TestIndexGuard scans from persisting to the
developer’s configuration directory.
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CHANGELOG.mdrust/src/cost_scanner.rsrust/src/usage_index.rs
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A cold Charts scan collected every newly parsed file until the last one before writing the snapshot, which put the corpus in RAM twice.
persist() loaded it before taking the lock and reused that value for the decision afterwards. An apply() that landed in the window between the two set the flag on inserts this persist then skipped, and nothing wrote them. The authoritative read now happens under the lock; the pre-lock load stays as a fast path, which is safe because the scan that set the flag runs its own persist. The other half of the report - a stale snapshot being written over a later one, then clearing the flag - is closed by #359, which holds the write guard through atomic_write. Encode, write, and the clear are now all under the same lock, so no apply can interleave.
SBS-946 landed the mid-scan price check in commit(), which ran once per scan. Batching moves the write to once per chunk, so the check moves with it: apply() now takes the fingerprint the walk began under and drops a batch whose catalog moved, rather than folding old dollars into an index the next reader treats as current. for_each_indexed_file captures that fingerprint once for the whole walk, not per chunk, so a refresh part-way through drops the remaining batches instead of mixing eras. apply_scan and ScanWrite are gone: their two halves are the gate in apply() and the touch accounting in persist(). scan_may_commit, the predicate both were built on, still carries the tests.
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## Why this matters before a release The unreleased section currently reads: | Section | Bullets | |---|---:| | Added | 1 | | **Security** | **17** | | Internal | 1 | | Fixed | 1 | Cutting 1.5.35 from that would announce **seventeen security fixes**. There is one: `Gemini treats a missing home directory as not logged in` — the entry that created the section, because it stopped live OAuth tokens being written into a checked-in fixture. **This is my fault.** Landing 21 PRs today meant resolving twenty-odd CHANGELOG conflicts, and my resolution merged bullets by position without regard for the heading above them. Entries kept landing in whichever section the conflict happened to open in, and `### Security` sat at the top of the drift. ## What Every bullet restored to the section the commit that introduced it had it in — recovered from `git log -S` per bullet, not from my judgement of what looks security-ish. Section order matches 1.5.33: Added, Security, Fixed, Internal. | Section | Before | After | |---|---:|---:| | Added | 1 | 1 | | Security | 17 | **1** | | Fixed | 1 | **17** | | Internal | 1 | 1 | No bullet text changed, and none was lost — still 20. Three entries (#351, #354, #355) were introduced after the drift began, so history could not place them cleanly. Their PR diffs add no `### Security` heading and none is a security fix, so they sit under Fixed. <!-- CURSOR_SUMMARY --> --- > [!NOTE] > **Low Risk** > Documentation-only CHANGELOG reordering; no product or security code changes. > > **Overview** > Fixes a merge-conflict mix-up in the Unreleased notes that had put **seventeen** bullets under **Security**. > > Section order is now Added, Security, Fixed, Internal. The Gemini missing-home-directory credential fallback stays the only Security entry. The other sixteen notes (plus the mid-scan price-fingerprint item that had been under Internal) move to **Fixed**. Bullet text is unchanged. > > <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit 8c561c6. Bugbot is set up for automated code reviews on this repo. Configure [here](https://www.cursor.com/dashboard/bugbot).</sup> <!-- /CURSOR_SUMMARY --> <!-- Macroscope's pull request summary starts here --> <!-- Macroscope will only edit the content between these invisible markers, and the markers themselves will not be visible in the GitHub rendered markdown. --> <!-- If you delete either of the start / end markers from your PR's description, Macroscope will append its summary at the bottom of the description. --> > [!NOTE] > ### Move unreleased changelog fix entries back under the `### Fixed` section > Reorganizes [CHANGELOG.md](https://github.com/tsouth89/ceiling/pull/370/files#diff-06572a96a58dc510037d5efa622f9bec8519bc1beab13c9f251e97e657a9d4ed) by adding a `### Fixed` subsection under the Unreleased heading and relocating the price-change-scan fix bullet into it. Removes a duplicate `### Fixed` subsection and stray blank lines that appeared after the `### Internal` section. > > <!-- Macroscope's review summary starts here --> > > <sup><a href="https://app.macroscope.com">Macroscope</a> summarized 8c561c6.</sup> > <!-- Macroscope's review summary ends here --> > <!-- Macroscope's pull request summary ends here --> <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **Documentation** * Updated the unreleased changelog with a **Fixed** section. * Reorganized unreleased entries under the appropriate headings. <!-- end of auto-generated comment: release notes by coderabbit.ai -->
1 participant
Summary
updatesvec and onlycommited after the last file, so a large corpus sat in RAM twice (scan working set + live index) before a single byte was written.for_each_indexed_file: read one parse-sized batch, fold,applythat batch, drop the working-set records, thenpersistthe snapshot once at the end.IndexStore::applyinserts without encoding;persistwrites only if the scan stored files or a reused entry is old enough that its TTL stamp must reach disk.A user opening Charts after a cold start, or after the index is discarded (price change / daily invalidation), no longer holds the whole corpus in a side buffer until the walk finishes.
Closes nothing on GitHub. Linear SBS-951.
Test plan
a_cold_claude_index_scan_flushes_stores_per_parse_batch— 40 files, ≥2 applies, each ≤ parse-batch limit, fold still sees every recorda_cold_codex_index_scan_flushes_stores_per_parse_batch— same shape on rolloutsStoreandapplyonce. Both tests failed withcold scan of 40 files flushed [40]; holding every Store until the end is SBS-951. Production batched apply restored; both pass.usage-index/(or after a price-catalog rewrite) and confirm the first scan still reports the same dollars, without a multi-GB working set sitting until the last file.Quality gate (
.github/workflows/ci.ymlrust-shared)target/deleted after tests.Fail-without-fix
Reverted only the per-batch
applyto oneapplyof the whole corpus:Restored; both pass.
Sweep
Hits after the fix:
usage_index.rsapply/commit/persistdefinitions (commitis nowapply+persist, unused by the scanner)cost_scanner.rsfor_each_indexed_file— the only call site; both Claude and Codex go through itGrok has no usage index (per-session parse only). Not the same pattern.
SBS-909 (charts reuse scan) already merged via #329. Not touched.
What this makes more likely
applybetween batches instead of holding one read lock for the whole walk. Last-writer persist is still SBS-948.Leftovers (not this ticket)
persiststill re-encodes the whole snapshot once per dirty scan (UsageIndex::encodedoubles peak at write time).IndexStorerecords — by design, not this ticket.dedup_key.Note
Apply usage-index stores per parse batch instead of buffering entire scan
for_each_indexed_filehelper in cost_scanner.rs, reducing peak RAM by avoiding accumulation of allNewEntryupdates until end-of-scan.apply_scan/ScanWritewrite path in usage_index.rs with a two-phaseIndexStore::apply(batch insert) andIndexStore::persist(single disk write), with a newdirty: AtomicBoolfield tracking whether persistence is needed.TEST_INDEX_ENABLEDflag instead of globally disabling the index.IndexStore::persistreadsdirtyunder the write lock to close a race where concurrentapplycalls could be skipped;IndexStore::reset_for_testis added for cold-index test setups.Macroscope summarized 95ae1c2.
Note
Medium Risk
Touches concurrent usage-index apply/persist and mid-scan price gating. A cancelled walk can now leave a partial snapshot on disk, which the next scan is expected to fill as misses.
Overview
Stops a first Charts scan from holding every newly parsed Claude/Codex transcript in a side
updatesvec until the last file. Parse already batched; the index path now matches that bound so a large cold start (or a discarded index) no longer keeps the corpus in RAM twice before writing.Claude and Codex share
for_each_indexed_file: each parse-sized chunk is folded,IndexStore::applyinserts it, thenpersistwrites the snapshot once at the end. Mid-scan price changes still drop the batch (SBS-946).commitremainsapply+persist.Tests opt into the real index path and assert a 40-file cold scan flushes more than once, each flush no larger than a parse batch. A concurrent apply/persist test covers the dirty-flag race.
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Summary by CodeRabbit
Performance
Bug Fixes