fix(state): serialise BoundWrapper.func by value when not importable by reference - #887
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…by reference BoundWrapper relied on default dataclass pickling, which references func by (module, qualname). That only resolves in a ProcessPoolExecutor worker under the 'fork' start method, where the worker inherits the parent's already- imported objects. Under 'spawn'/'forkserver' (default on macOS/Windows, and on Linux 3.14+) the worker is a fresh interpreter that must import func to find it, so anything defined in __main__, a notebook, or a local closure raised AttributeError/PicklingError and brought the pool down as BrokenProcessPool. __reduce__ now serialises func into a standalone bytes payload up front: plain pickle when func is importable by reference (unchanged, no cloudpickle needed), else cloudpickle by value with a clear error if cloudpickle isn't installed. Pre-serialising means the payload survives regardless of which pickler carries the outer BoundWrapper (stdlib pickle via ProcessPoolExecutor, or cloudpickle via SshCache/executorlib). Closes #840 Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Nhem4ftatpXhjwtxDnLLaV
…round-trip a closure test-minimum-deps CI resolves cloudpickle to its declared floor (2.0.0), which can't reconstruct even a bare closure's code object on this Python (TypeError: code() argument 13 must be str, not int) — the same class of cloudpickle/Python version-skew gap test_wrap_executor_cloudpickle_lock.py already skips around. Add the same defensive skip to the two new #840 tests so they report an environment limitation instead of failing outright. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Nhem4ftatpXhjwtxDnLLaV
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…for #840 (#888) Scheduled audit of `AGENTS.md` and its linked guides against the tracker state as of 2026-08-22. No code landed on `main` since the previous audit (#882), so the Quick Reference and Architecture claims are unchanged; the delta is issue-tracker state only. - Add the 2026-08-21 refactor cohort under open proposals: #883 (`_raw_sub_digests` hardcodes built-in `Digested` subtypes, breaking `gc()`/`count_reuses()` for `register_destructurer` extensions — the one correctness gap of the batch), #884 (sqlite URL handling hand-rolled twice and drifted on `~`-expansion), #885 (`XDG_CACHE_HOME` companion to #868), #886 (`benchmark_storage.py` five-op timing harness duplicated). - Record PR #887 in flight against bug #840 (`BoundWrapper.__reduce__` pre-serialises `func`: `pickle` by reference, `cloudpickle` by value). - Split the single Bugs/Feature-request paragraph into one-item-per-line sub-bullets so independent updates stop colliding in merges. Verified still open and accurately described: PRs #797, #837, #873-#878, #879, #881. --- _Generated by [Claude Code](https://claude.ai/code/session_01J6LqSMaWKWzDfF7hF51Syq)_ Co-authored-by: Claude <noreply@anthropic.com>
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…theme (#889) Scheduled AGENTS.md audit, 2026-08-23. No code has landed on `main` since the 2026-08-21 audit (63a0584), and the issue/PR state recorded in `agents/DEVELOPING.md` is still current: in-flight PRs #873–#878, #881, #887, and #797 all remain open; no new issues since #883–#886. Spot-checks of the Quick Reference and Architecture claims against `src/` all pass (public `__all__`, `_lazy_default`/`_sticky_set`/`_hard_set`, `PreparedCall`/two-phase save, `register_storage`, `_CACHE_TEMPLATES`, `Runtime.cputime`/`systime`, module line counts quoted in #789/#832). `AGENTS.md` and `agents/USAGE.md` need no changes. One gap found: the performance theme names "pooled file handles in `bagofholding_file.py`" as a fix candidate without noting that draft PR #786 (open since 2026-07-23) already implements it, and PR #804 (open since 2026-07-31) — the benchmark-harness fix that removes the always-evicting `SizeLimitedCache(max_size=10)` config — was recorded nowhere. Both are now listed under the perf theme as check-before-duplicating entries, added as separate paragraphs to keep future edits conflict-free. 🤖 Generated with [Claude Code](https://claude.com/claude-code) https://claude.ai/code/session_01H9uSJpX8SLJrtYbc2ZaSv5 --- _Generated by [Claude Code](https://claude.ai/code/session_01H9uSJpX8SLJrtYbc2ZaSv5)_ Co-authored-by: claude[bot] <claude[bot]@users.noreply.github.com>
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…qlFile fsync cheap fix (#898) Weekly AGENTS.md/DEVELOPING.md audit. Only one change since the 2026-08-27 pass (#897): issue #625's perf audit was refreshed the same morning. - Update the perf-audit pointer in `agents/DEVELOPING.md` from "refreshed 2026-08-20" to 2026-08-27 and record the run's verdict (no new source-caused regressions; flagged rows are the chronic `BagOfHoldingH5File` per-op open cost or noise). - Record the still-open SQL-side hot spot the refreshed audit re-flags: `Sql` fsyncs once per key on `save`/`evict` because `_configure_sqlite_pragmas` (`src/fleche/storage/sql.py:190-227`) sets `journal_mode=WAL` but no `synchronous` pragma; the cheap fix (`PRAGMA synchronous=NORMAL`) has been flagged in every audit since 2026-05-07. Verified against the source — the function sets only `foreign_keys` and `journal_mode`. Everything else checked and current: no merges to `main` since #897; open PRs (#873, #874, #887, #892, #894, #896, #797, #786, #804) and issues (#893, #895, #625) are all already recorded. `eisenforschung/landau` was audited in the same pass and needs no update (nothing landed since its 2026-08-25 pass; in-flight PRs #391/#394/#395/#414/#422 unchanged; spot-checked claims hold). --- _Generated by [Claude Code](https://claude.ai/code/session_012SCLy9y7aUR7F44Q7UviGo)_ Co-authored-by: Claude <noreply@anthropic.com>
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…racker items (#904) Scheduled AGENTS.md audit. Changes since the 2026-08-27 pass: - Release-state claims updated: PR #793 (two-phase save) and PR #843 (lock-free pickle-family backends) shipped in 0.22.0 on 2026-08-28 (release PR #837); the three "unreleased as of 2026-08-27" qualifiers are gone. Noted that `fix(query)` #894 is an ancestor of the 0.22.0 tag (verified via `git tag --contains c82c691`) even though the generated changelog entry omits it. - PR #894 (`latest()`/`oldest()` raise `ValueError` when no matching call carries `Runtime` metadata, `IndexError` on empty), PR #892 (gc mid-sweep guards + 441-case digest product collapse, suite 1738 → 1299), and docs-audit PRs #873/#874 moved from the in-flight section to decisions landed; the in-flight section is now a one-liner pointing at the five PRs still open (#887, #804, #797, #786, #523), each covered under its theme. - New tracker items recorded: the 2026-08-28 refactor cohort #899–#902, bug #903 (`put()` `filelock.Timeout` fatality on ≤0.21.2, dedup-concentrated lock contention; resolved for pickle-family by 0.22.0's atomic rename, bagofholding multi-bag still exposed per #893), and the #895 resolution (documented limitation per the 2026-08-28 maintainer comment). #900 cross-referenced at the `pypi-publish.yml` line in the workflows list. - The #893 bullet's `lock_timeout` mitigation sentence rephrased to the current state: the `FutureWarning` drop covers only pickle-family configs, a bagofholding `values.lock_timeout` still works on 0.22.0 (checked against `config.py:466`). - USAGE.md: query section states the `latest()`/`oldest()` `ValueError`/`IndexError` contract (verified against `query.py:149-188`). landau's AGENTS.md was audited in the same pass and left unchanged — no code or tracker movement since its 2026-08-24 update (only docs commits on main; issues #423–#425 and PRs #422/#414/#395/#394/#391 unchanged). 🤖 Generated with [Claude Code](https://claude.com/claude-code) https://claude.ai/code/session_014myhh6xKWC2VhQeB92mGSn --- _Generated by [Claude Code](https://claude.ai/code/session_014myhh6xKWC2VhQeB92mGSn)_ Co-authored-by: Claude <noreply@anthropic.com>
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Closes #840.
Problem
BoundWrapperrelied on default dataclass pickling forfunc, whichreferences it by
(module, qualname). That only resolves in aProcessPoolExecutorworker under theforkstart method, where the workerinherits the parent's already-imported objects. Under
spawn/forkserver(default on macOS/Windows, and on Linux 3.14+) the worker is a fresh
interpreter that must import
functo find it, so anything defined in__main__, a notebook, or a local closure raisedAttributeError/PicklingErrorat load time and brought the whole pool downas
BrokenProcessPool. There was no error at the submit site — the firstsign of trouble was a dead worker.
Fix
BoundWrapper.__reduce__now serialisesfuncinto a standalonebytespayload up front, instead of leaving it for the outer pickler to serialise:
funcis picklable by reference (the common case — a module-level or@fleche-decorated function), it's pickled with plainpickle, exactly asbefore. No
cloudpickledependency is introduced for this path.cloudpickle, serialisingfuncby value, witha clear
TypeErrorifcloudpickleisn't installed.Pre-serialising the payload means it survives regardless of which pickler
carries the outer
BoundWrapper— stdlibpickle(ProcessPoolExecutor,any start method) or
cloudpickle(SshCache,executorlib) alike.Testing
tests/unit/fleche/test_bound_wrapper.py: new cases for a locally-defined(non-importable) function pickling by value via
cloudpickle, the clearerror when
cloudpickleis missing, and confirming a module-level functionstill round-trips without
cloudpickleat all.tests/regression/test_issue_840.py: end-to-end reproduction — a localclosure shipped through a real
spawn-contextProcessPoolExecutor.Verified this fails with
AttributeError: Can't pickle local object ...on
mainand passes with this fix.pytest tests/— 1724 passed (the only failures are 10pre-existing notebook-execution tests that fail in this sandbox because the
jupyterconsole script isn't installed, unrelated to this change).ty check src/— clean.Generated by Claude Code