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fix(repo): transcripts::reindex scans outside the index lock and merges concurrent ingest (#274) - #277
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…es concurrent ingest (#274) The clone's post-clone transcript reindex scanned and rewrote .sc/transcripts and .sc/transcript-drops without holding the index lock across the scan, so a serve-path ingest into the same destination during the scan lost its appended lines. Same pattern as the signature rebuild (#273): scan and tombstone signature checks run unlocked, up to four unlocked catch-up passes, then a final pass under the lock judges only what is new (transcripts whose snapshot landed late, tombstones not honored yet, tombstones whose dropped body is new) before the rewrite. Trusted set and signature index are re-read each pass; a changed trusted set discards earlier verdicts. The locked listing also reloads the pack index so packs another handle wrote since open count. ADR-0038 addendum updated.
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The title clearly and concisely describes the main change: moving transcript reindex scanning outside the index lock and merging concurrent ingest. It is directly related to the pull request objective… |
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Issue [#274] requires verification outside the lock, catch-up passes, and a final pass under the lock. crates/repo/src/transcripts.rs implements the multi-pass scan and locked rewrite. The implement… |
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The changes stay within issue [#274]. The source changes fix the transcripts::reindex race. The tests verify the required concurrent-ingest behavior. The ADR addendum documents the changed reindex b… |
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Docstring coverage is 82.35% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 17 functions across 1 files. (1 skipped: 1 … |
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The title clearly and concisely describes the main change: moving transcript reindex scanning outside the index lock and merging concurrent ingest. It is directly related to the pull request objectives.
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Issue [
#274] requires verification outside the lock, catch-up passes, and a final pass under the lock.crates/repo/src/transcripts.rsimplements the multi-pass scan and locked rewrite. The implementation reloads packs in the locked pass, re-reads trust and signature state, and rejudges late snapshots and tombstones. The reported tests cover concurrent ingest, late signatures, trust rejection, and external pack writes. The ADR addendum records the loose-object listing behavior.
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The changes stay within issue [
#274]. The source changes fix thetranscripts::reindexrace. The tests verify the required concurrent-ingest behavior. The ADR addendum documents the changed reindex behavior. No unrelated product behavior is identified.
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Docstring coverage is 82.35% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 17 functions across 1 files. (1 skipped: 1 unsupported.)
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Review comments at @crates/repo/src/transcripts.rs:
- Around line 769-778: In the tombstone loop of judge, before calling
tombstone_honored, use only trusted and sigs to detect whether any trusted
signer has an indexed signature for the tombstone ID. If none exists, remove the
ID from self.honored and continue without reading t.snapshot or dropped;
preserve the existing tombstone_honored path when a trusted signature is
present.
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crates/repo/src/transcripts.rsdocs/adr/0038-agent-session-transcripts.md
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| self.fp = fp; | ||
| } | ||
| let wanted: BTreeSet<ObjectId> = self.tombs.keys().copied().collect(); | ||
| let sigs = crate::signatures::load_sig_index(layout, Some(&wanted), &trusted)?; |
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When the store contains any tombstone, the final Scan::pass runs under with_index_lock and reaches this call, where load_sig_index parses the entire signatures.v2 file before the subsequent tombstone checks. With a large signature index or many unhonored tombstones, this makes the supposedly short-lived critical section unbounded; a concurrent put_pack can exceed the 30-second lock wait after its objects have already been stored, leaving that ingest's derived indexes unupdated. Snapshot or otherwise narrow the signature data before acquiring the lock so the locked pass only merges newly arrived state and performs the rewrites.
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Not changing this. The locked pass must read the current signature index: a signature stored by an ingest that finished before the lock was taken is exactly what it has to see, so it cannot be snapshotted earlier. It is one read of signatures.v2 (the same read every serve-path ingest does in index_incoming), and as of a09993a it is skipped when no trusted signer exists or no tombstone needs a verdict, and unsigned tombstones no longer cost object reads. The scan and per-object work stay outside the lock.
…rust-change tests (#274) Skip the signature index read when no trusted signer exists or no tombstone needs a verdict, refuse an unsigned tombstone before reading objects, and pin the trust-withdrawn and mismatched-body cases with tests. ADR addendum notes the pack reload is defensive.
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Approved: two independent Opus passes (no blockers), Codex clean on head, CI green.
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Approved: two independent code-reviewer passes (no blockers), Codex security clean, CI green; rejected Codex P2 reasoned (locked pass must read the current signature index).
Closes #274
transcripts::reindex(run aftersignatures::reindexon clone) did its scan and rewrite of.sc/transcripts/.sc/transcript-dropswith no catch-up for objects a serve-path ingest stored meanwhile, so that ingest's index lines and drop lines could be overwritten.Change
Same pattern as #273:
O_APPENDdrop appends,--no-transcriptsand lock reentrancy are untouched. The ingest holds the lock only around its own index updates, so there is no new lock nesting.Store::reload_packs()first, so packs another handle wrote since the store opened are seen (one.idxread under the lock).signatures::reindexstill relists loose objects only; noted in the ADR.ADR-0038 addendum extended with a #274 bullet.
Tests
New in
transcripts.rs(all use areindex_withhook to interleave at two points: right after the first scan and just before the lock):reindex_keeps_an_ingest_that_lands_during_its_scan: a concurrent ingest of a body, a tombstone and its trusted signature loses no index line and no drop line.reindex_judges_again_what_lands_after_the_first_scan: a transcript whose snapshot lands late, a tombstone whose signature lands late; a late signature by an untrusted key honors nothing.reindex_sees_a_pack_another_handle_wrote_since_the_store_opened.Mutation checks: dropping the locked pass, the pack reload, the waiting-transcript retry, or the re-judging of unhonored tombstones each makes at least one of these fail.
Verification
cargo fmt --all,cargo clippy --workspace --all-targets -- -D warnings,cargo test -p scl-repo -p scl-cli: all pass.Summary by CodeRabbit