fix(responses): bound the durable spill directory with an aggregate byte cap - #3032
fix(responses): bound the durable spill directory with an aggregate byte cap#3032lifrary wants to merge 1 commit into
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📝 WalkthroughWalkthroughThe response state store now limits durable spill data to 1 GiB. It recomputes spill usage during pruning and periodic sweeping, evicts deferred and active spills, adds test controls and coverage, and documents the spill directory and limit. ChangesDurable response spill capacity
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟡 Moderate · up to The change improves protection against spill-directory disk exhaustion, but the current implementation can temporarily exceed the 1 GiB cap during Windows spill publication and can lose replayable response state after an interruption if eviction occurs before replacement data is durable. Merge should wait for these lifecycle issues to be addressed or explicitly accepted by the owner. Sequence Diagram(s)sequenceDiagram
participant ResponseState
participant pruneResponses
participant SpillDirectory
ResponseState->>pruneResponses: Recompute active and deferred spill bytes
pruneResponses->>pruneResponses: Compare total with configured cap
pruneResponses->>SpillDirectory: Unlink deferred spill generations first
pruneResponses->>SpillDirectory: Unlink oldest active spill files
pruneResponses-->>ResponseState: Retain spill files within the cap
Suggested reviewers: 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 70.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 10 functions across 2 files. (1 skipped: 1 unsupported.)
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리뷰 · 우선순위 71 / 80이 PR은 지금 작성자가 2026-08-30 맥에서 잰 숫자가 그 구멍입니다. 약 150 MB 짜리 상태를 분당 1.4개 보내면, 44분 뒤에 그 폴더가 6.8 GB 였고 한 시간이면 약 12 GB 로 갑니다. 볼륨이 차서 다른 프로세스가 고치는 자리는 1 GiB 숫자의 뜻은 본문이 이미 말합니다. 같은 표본 31개의 중앙값은 1.1 MiB, p90 은 198.7 MiB 입니다. 중앙값에서는 1000개 한도와 1 GiB 가 거의 같이 붙습니다. 1000 × 1.1 MiB = 1.07 GiB. 보통 트래픽은 예전과 같이 항목 수 한도에서 잘리고, 큰 꼬리만 디스크 한도에 걸립니다. 한도를 너무 낮추면 이어가기가 테스트는 열린 PR #3018 도 라인 30 - HEAD 의 메인테이너의 판단이 필요한 지점
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Inline comments:
In `@src/responses/state.ts`:
- Around line 1133-1136: Update the eviction loop around states to select spill
entries by ascending createdAt rather than Map iteration order, using a
deterministic ID tie-breaker for equal timestamps. Preserve the existing
single-pass deletion behavior, and add a regression case covering resident
demotion followed by disk eviction to verify older entries are evicted first.
Apply the same fix in `@tests/responses-state.test.ts` around lines 715 - 717: The
focused test must verify eviction order and resident-demotion behavior, not only
the byte limit.
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Re: the eviction-order finding on Ordering. Eviction now selects spill entries by ascending Tie-breaker. This is the part I had missed, and it matters more than it looks: Tests. Three regressions, each confirmed to fail without the specific code it covers:
My first attempt at the ordering test passed with and without the sort, so it proved nothing; it was discarded rather than adjusted. The replacement does not depend on a snapshot reload. All three exercise resident demotion: the RAM cap is set to 1024 bytes, so every entry reaches disk through Verification on the rebased branch ( |
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Both review-requested test cases are in, at
There are now four regressions, each confirmed to fail without the specific code it covers. On the readiness checklist, in the interest of not overclaiming. Four tests fail on this machine, and all four also fail on stock
For the record on timing: this suite is load-sensitive here. Two earlier full runs on this branch were green (16500 and 16511 pass, 0 fail), and two runs hit the runner's own 900s parallel guard on On the judgment points raised.
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Inline comments:
In `@src/responses/state.ts`:
- Around line 214-219: Update spilledResponseBytes and the disk-cap enforcement
flow to include bytes from pendingSpillUnlinks; when deferred files would exceed
the cap, force successful snapshot persistence, drain deferred unlinks, then
recalculate usage before evicting active entries. Add a regression test that
repeatedly replaces one spilled response before the deferred-unlink queue
drains.
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The deferred-generation finding is valid and is fixed in Two changes:
I did not add the forced snapshot persistence from your suggestion. New regression: That makes five regressions on this PR, each confirmed to fail without the specific code it covers. Re-verified on the amended commit: One note on the local-suite numbers I posted earlier: I attributed four of the failures to machine load. That was wrong. They were all the same hardcoded-pid fixture defect, now sent separately as #3042, and with that fixed the full suite is green here for the first time. The load did make those tests slow; it did not make them fail, and I conflated the two. |
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Requesting changes on exact head c80baf0. The aggregate budget, createdAt ordering, deterministic tie-breaker, deferred-generation accounting, and oversized-single-file termination are all valuable. One product boundary is still missing: the cap is enforced only at the end of mutation-path pruneResponses. A process can load or restart over budget and then remain idle indefinitely above the advertised aggregate ceiling; the author observed 1.8 GiB staying above the 1 GiB cap until the first request arrived. Extract the spill-budget eviction into one helper and invoke it on state load or the existing periodic liveness/TTL sweep as well as mutation pruning. Add a regression that restores an over-budget snapshot and proves the periodic/startup path reclaims oldest spills without requiring a new continuation mutation, while preserving the newest replayable entry. Keep orphan crash files on their existing grace sweep if desired, but document that separate temporary allowance precisely. Exact-head Cross-platform CI should run only after this boundary is covered.
…yte cap The response store has an unconditional RAM ceiling (MAX_STORED_RESPONSE_BYTES, 64 MiB) and demotes the oldest resident entry to a durable spill once it is crossed. Nothing bounded where those bytes landed: the spilled set was capped only per file (MAX_RESPONSE_SPILL_PAYLOAD_BYTES, 256 MiB) and per entry (MAX_STORED_RESPONSES, 1000). Their product is 250 GiB, larger than the disk of any host this runs on, so the only effective bound was RESPONSE_TTL_MS and disk use became a function of client request rate rather than of anything this process controls. Measured on one macOS host, 2026-08-30: a client spilling ~150 MB payloads at ~1.4/min held 6.8 GB of ~/.opencodex/responses-state-spill after 44 minutes and was still climbing toward the ~12 GB an hour-long window implies. It filled the volume, at which point unrelated processes began failing with ENOSPC. Retention itself was correct throughout - the TTL evicted that whole cohort an hour later - so this is a missing budget, not a leak. Add MAX_SPILLED_RESPONSE_BYTES (1 GiB), enforced by one function, enforceSpilledResponseBudget, with three callers: mutation pruning, the lazy load that follows a restart, and the periodic sweep. The periodic caller is not redundant. The mutation path runs only when traffic arrives, so a process that comes up over budget - from a snapshot written under a larger ceiling, or a build that lowered it - would otherwise stay over while idle. That was observed here at 1.8 GiB against a 1 GiB cap, held until the first request. sweepExpiredResponseStates still returns its TTL count, so its existing contract is unchanged. The ceiling bounds what the store can account for: every entry in the map plus the superseded generations queued in pendingSpillUnlinks, whose files stay on disk until a snapshot flush drains them and would otherwise let up to 32 GiB sit outside the budget while it reported itself satisfied. Over budget those deferred generations are released before any live entry, which is the same trade the queue's own overflow path already makes against unbounded disk. Spill files orphaned by a crash are absent from the map, so this accounting can neither see nor price them; they remain with recoverOrphanedResponseSpills and its grace window, and structure/02 now states that allowance and its bound explicitly. Eviction of live entries is ordered by createdAt, not by map order. `states` is not an age index: demotion and spill replacement delete and reinsert entries, and writeBoundedSnapshot serializes the map reversed, so map order can put a newer continuation first. createdAt is millisecond-resolution and ties are ordinary under load, where a stable sort would fall back to insertion order, so ties break on the response id by direct comparison rather than localeCompare, since the order must not depend on the host locale. The total is recomputed per enforcement rather than carried as a running counter: spilled entries reach `states` through several insertion paths (demotion swap, direct oversized admission, snapshot reload), and one missed increment there would silently disable the cap, where a walk over at most MAX_STORED_RESPONSES entries cannot drift. 1 GiB comes from the same sample (n=31), whose spilled sizes are strongly bimodal: median 1.1 MiB against a p90 of 198.7 MiB. At that median the count cap and this ceiling bind within 8% of each other (1000 x 1.1 MiB = 1.07 GiB), so ordinary traffic sees no eviction it would not already have seen and only the large tail is cut. The value is the one knob here a maintainer may reasonably want to change. Six regressions, each confirmed to fail without the code it covers: the budget is enforced and the oldest spill is the one removed; eviction follows createdAt rather than insertion order; ties break on the id; a single payload larger than the whole budget leaves the store usable rather than wedged; deferred generations count against the cap and drain first; and an over-budget snapshot is reclaimed with no continuation mutation at all - a read drives the load path and a later tick drives the periodic one, with the newest entry surviving and still replaying. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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The product boundary is covered in One owner, three callers. The eviction is now Regression, with no continuation mutation. That makes six regressions on this PR, each confirmed to fail without the specific code it covers. The orphan allowance is now stated rather than implied. On the local suite, precisely. The full suite has not produced a clean run on this machine, and I would rather say so than round it up. Two attempts on this head: one hit the runner's own 900 s parallel guard on |
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Inline comments:
In `@src/responses/state.ts`:
- Around line 643-652: Update spilledResponseBytes and the Windows spill
publication flow around writeResponseSpillDurablyAsync to reserve the
prospective payload before creating the temporary spill file, enforce the
existing budget with that reservation included, and release it whenever the
publication settles. Add a gated-Windows regression test covering active spills
already at the cap and verifying the pending publication cannot exceed the
budget.
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| function spilledResponseBytes(): number { | ||
| let total = 0; | ||
| for (const entry of states.values()) { | ||
| if (entry.kind === "spill") total += entry.spill.payloadBytes; | ||
| } | ||
| // Superseded generations awaiting a durable snapshot are still files on disk. | ||
| // Counting only `states` would let PENDING_SPILL_UNLINKS_MAX of them sit outside | ||
| // the budget while it reports itself satisfied. | ||
| for (const ref of pendingSpillUnlinks) total += ref.payloadBytes; | ||
| return total; |
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🩺 Stability & Availability | 🟠 Major | 🏗️ Heavy lift
Reserve capacity for an in-progress Windows spill publication.
Line 643 counts only mapped spills and deferred generations. A Windows publication keeps its candidate resident, then writeResponseSpillDurablyAsync() creates and fsyncs a temporary spill file before it awaits ACL hardening. If mapped spills already consume 1 GiB, one permitted pending publication can add nearly 256 MiB in responses-state-spill/ during that wait.
Reserve the prospective spill payload before publication, enforce the budget before creating the temporary file, and release the reservation when the job settles. Add a gated-Windows regression test with active spills at the cap.
🤖 Prompt for AI Agents
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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
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In `@src/responses/state.ts` around lines 643 - 652, Update spilledResponseBytes
and the Windows spill publication flow around writeResponseSpillDurablyAsync to
reserve the prospective payload before creating the temporary spill file,
enforce the existing budget with that reservation included, and release it
whenever the publication settles. Add a gated-Windows regression test covering
active spills already at the cap and verifying the pending publication cannot
exceed the budget.
…oadmap (lidge-jun#3087) Rescans every open issue and bug-labelled PR against a written-down four-axis rubric, and plans the six targets that score >= 70 as one PABCD cycle each. Six enter the train: lidge-jun#3071 (73), lidge-jun#3032 (75), lidge-jun#3026 (75), lidge-jun#3029 (72), lidge-jun#3008 (71), lidge-jun#3019 (70). Sixteen below-bar items are recorded with components so the next scan does not re-litigate them, and lidge-jun#3068 is suppressed as a duplicate of lidge-jun#3071. The scan corrected several assumptions the titles suggested. lidge-jun#1527 and lidge-jun#3070 are already fixed on dev; lidge-jun#3059 asserts an unmount path the tree cannot produce; PRs lidge-jun#3040, lidge-jun#3041 and lidge-jun#3067 each found a real defect and proposed a worse remedy; PRs lidge-jun#3063 and lidge-jun#3038 claim regressions that pass against unfixed source. Eleven adversarial review rounds, all findings verified in-tree before amendment. Findings per round: 9, 5, 4, 4, 3, 2, 3, 3, 1, 0. Round 11 passed. Round 1 found nine holes in the plan; after that the defects were in the fixes, which is what 002-011 mostly record.
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Summary
~/.opencodex/responses-state-spill/has no aggregate size bound.The response store has an unconditional RAM ceiling (
MAX_STORED_RESPONSE_BYTES, 64 MiB) and demotes the oldest resident entry to a durable spill once it is crossed. Nothing bounded where those bytes landed: the spilled set was capped only per file (MAX_RESPONSE_SPILL_PAYLOAD_BYTES, 256 MiB) and per entry (MAX_STORED_RESPONSES, 1000). Their product is 250 GiB — larger than the disk of any host this runs on — so the only effective bound wasRESPONSE_TTL_MS, which makes disk use a function of client request rate rather than of anything the proxy controls.Measured on one macOS host, 2026-08-30: a client sending ~150 MB response states at ~1.4/min held 6.8 GB of that directory after 44 minutes, still climbing toward the ~12 GB an hour-long window implies. It filled the volume and unrelated processes began failing with
ENOSPC. Retention itself was correct throughout — the TTL evicted that whole cohort an hour later — so this is a missing budget, not a leak.This adds
MAX_SPILLED_RESPONSE_BYTES(1 GiB) and evicts oldest-first past it inpruneResponses, immediately after the RAM demotion loop that creates the pressure.deleteEntryalready routes throughdeleteOwnedSpills, so an evicted entry unlinks its file.Recomputed, not counted. The spilled total is recomputed per prune rather than carried as a running counter. Spilled entries reach
statesthrough several insertion paths (demotion swap, direct oversized admission, snapshot reload), and one missed increment would silently disable the cap, where a walk over at mostMAX_STORED_RESPONSESentries cannot drift.Scope of the bound. It bounds the entries the store tracks. Spill files orphaned by a crash are not in
states, are not counted here, and remain the existingrecoverOrphanedResponseSpillsgrace-period sweep's job.No config key. The three sibling bounds in this subsystem — count, TTL, per-file — are all bare constants, so this one is too. A
...Mbkey on theappOwnedMemoryBudgetMbpattern is an easy follow-up if you would prefer one.The value is the knob. 1 GiB comes from that same sample (n=31), whose spilled sizes are strongly bimodal: median 1.1 MiB against a p90 of 198.7 MiB. At that median the count cap and this ceiling bind within 8% of each other (1000 x 1.1 MiB = 1.07 GiB), so ordinary traffic sees no eviction it would not already have seen and only the large tail is cut. Erring small is the safe direction: too low costs a replay miss, an already-handled path surfaced as
previous_response_not_found; too high costs the host's disk. This is the one number here I would expect a maintainer to set differently.Docs. The spill directory appeared nowhere in
structure/,docs/ordocs-site/, while the state-root inventory instructure/00describes its group as bounded caches.structure/00andstructure/02now name it and its aggregate bound, following the existing prose + Decision Log pattern.Relation to #3018. That PR also edits
pruneResponses, but only inside the RAM demotion loop; this appends after that loop closes, so the two should not conflict textually. It is orthogonal in intent and introduces no aggregate bound.Verification
macOS, branch on
dev@870a2adb:bun run typecheck— exit 0, no output.bun test tests/responses-state.test.ts— 117 pass, 0 fail.bun run test:changed— 9885 pass, 0 fail across 542 files.bun run privacy:scan— passed.bun run test— 16500 pass, 0 fail across 998 files.Expected: <= 20000 / Received: 48564, and passes with it. Re-confirmed after the loop was simplified from a per-eviction rescan to a single pass.Checklist
deleteResponseSpill, which validates the ref before touching a path; no new file name is constructed from external input.Review readiness checklist
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All CI tests are green on my local testing.
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