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Prepare the repo for public readers: docs, SPEC and code comments brought up to date - #91
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Docs only, no code changes. Checked against main at d155fe6. - PERF-GAP-VS-LMDB: item statuses and the roadmap now match what landed (in-place WRITE_MAP, meta free-list annex, spilling, validation cache, forced inlining) and what was parked (lazy validation, O_DSYNC meta write). Drifted line refs are replaced with function names. The 1.8x commit figure is relabelled as the macOS run; on Linux, durable commits are at parity. - BENCH-MAP: benchmark cross-references updated after the delete_range, cursor and annex changes. - PLAN: Phase 3 status table; the 2.8, 3.1, 3.4 and 3.7 notes updated. - DECISIONS and ADR headers: implementation notes only, no decision changed. 0019's implementation was parked in PR #86. 0021 and 0022 merged as #88 and #89. - DIVERGENCES: D-004 no longer claims DUPSORT was implemented. D-014 and D-022 factual notes fixed. No status or approval changed. - CHANGELOG [Unreleased]: format v2 is a breaking change (v1 files are refused at open, migrate with dump then load), plus in-place WRITE_MAP, the annex and NO_READ_AHEAD. Notes that the v0.1.0 tag was never pushed. - README, COMPATIBILITY, TOOLS, CONSUMER-GATE, CONTRIBUTING, UPSTREAM-BUGS: format v2, the new options, release state, the CI description, mimalloc, and the memory behaviour of load and check. - SPEC: non-normative cross-references only. - ci.yml: header comment only. - PROGRESS: one appended line covering #88, #89, #90 and this sweep.
The maintainer authorized amending normative SPEC text to describe the engine as it is now. Only deliberate changes are folded in: accepted ADRs, approved divergences, and changes merged and kept. No code/spec disagreement turned out to be a correctness bug. All 160 rule IDs (TXN/GC/REC/BT/INV) are kept, none renumbered or retired. Each file carries a "Revised 2026-10-05" note. - 02 pages: FORMAT_VERSION 2 and v1 refused at open (ADR-0022), plus the annex offset constant. non_free_pages_size uses the GC-23 definition. The checksum field is reserved and written as 0. DUPSORT layout is parked. - 01 flags: NO_READ_AHEAD landed. WRITE_MAP is now in place (ADR-0021). fdatasync after msync runs on every platform. The 2.8a pins that were pending are adopted as spec text, with DUPSORT itself parked. - 00 API: WRITE_MAP in-place note. The rest of the surface re-verified, with no change needed. - 03 btree: point get through find_exact. The integer fast path is exactly memcmp order. Where dirty bytes live (heap staging, in-place WRITE_MAP, spill/unspill). Cursor-path retention covers deletes only. put_reserved uses a single descent. Allocation order now includes the annex. Same-size overwrite is scoped to inline values: the large-value same-size case was never built, tracked in #6. DUPSORT is marked parked. - 04 txn: snapshot fields include the annex. Frame pool realization note. - 05 gc: annex section marked ratified (PR #89). Drain representation note. - 06 recovery: format v2 at REC-1, v2 CRC offsets at REC-8 and REC-22. REC-12 states the shipped whole-map msync plus fdatasync, a superset of the ranged msync, which stays planned in #45; C3 then C4 then C5 order verified. REC-7 notes the parked O_DSYNC meta write. Also in PERF-GAP: the used-portion COW copy experiment was measured flat and reverted on 2026-10-02. Its record lived only in 279ceba on an unmerged branch.
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You can disable this status message by setting the 📝 WalkthroughWalkthroughThis PR updates project documentation and specifications for format version 2, recorded engine behavior and performance, project and release status, and CI and tooling guidance. It does not describe implementation-code changes. ChangesDocumentation and specification refresh
Priority: ⬇️ Low Estimated code review effort: 4 (Complex) | ~40 minutes Change: Other Merge Risk: 🔵 Low · up to Clarify the durability description and remove guidance pointing to unavailable release artifacts before merging. The progress entry also needs to follow the project's milestone-log rule. Architecture SummaryArchitecture risk: 🔵 Low · up to The change affects 6 systems. Changed systems: Architecture concerns Review detailsSystems and components
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- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @CHANGELOG.md:
- Around line 77-79: Reconcile the v0.1.0 section in the changelog with its
unreleased status: remove or correct claims that crates were published and
binaries attached, and update links that point to the missing tag.
Alternatively, clearly label the section as planned release notes so users do
not mistake unavailable artifacts for published ones.
Review comments at @docs/SPEC/01-flags.md:
- Line 461: Update the MDB_WRITEMAP row’s durability description to state that
synchronous flushes use whole-map MS_SYNC followed by fdatasync on every
platform, consistent with REC-12. Preserve the remaining write-strategy and
allocation details.
Review comments at @PROGRESS.md:
- Line 159: Split the combined entry in PROGRESS.md into separate one-line
entries, one per completed milestone, keeping the merged PRs and
documentation/issue-tracking cleanup distinct; preserve the existing factual
details while following the file’s one-line-per-milestone convention.
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.github/workflows/ci.ymlCHANGELOG.mdCONTRIBUTING.mdPLAN.mdPROGRESS.mdREADME.mddocs/BENCH-MAP.mddocs/COMPATIBILITY.mddocs/CONSUMER-GATE.mddocs/DECISIONS.mddocs/DIVERGENCES.mddocs/PERF-GAP-VS-LMDB.mddocs/README.mddocs/SPEC/00-api-surface.mddocs/SPEC/01-flags.mddocs/SPEC/02-pages.mddocs/SPEC/03-btree.mddocs/SPEC/04-txn-mvcc.mddocs/SPEC/05-gc.mddocs/SPEC/06-recovery.mddocs/TOOLS.mddocs/UPSTREAM-BUGS.mddocs/adr/0011-dupsort.mddocs/adr/0014-trusted-file-mode.mddocs/adr/0015-sequential-writes-option.mddocs/adr/0017-bounded-dirty-memory.mddocs/adr/0019-meta-write-dsync.mddocs/adr/0020-compact-page-header.mddocs/adr/0021-writemap-in-place.mddocs/adr/0022-meta-freelist-annex.md
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- Root: CLAUDE.md becomes AGENTS.md, rewritten as a public guide for human and AI contributors: project rules, unsafe policy, checks, repo map, style. Agent model names, milestone process and personal ratification notes are gone. PLAN.md, PROGRESS.md and .claude/ (agent definitions, slash commands) are removed from the tree; git history keeps them. /CLAUDE.md and /.claude/ are gitignored so local assistant configuration stays local. - Code comments: internal shorthand replaced with plain words in about 200 files: milestone codes, perf-inventory codes, "Phase N" roadmap labels, divergence IDs, and references to the removed files. Spec rule IDs (TXN-41, GC-16, ...) and ADR numbers are kept; they point to public docs. Every changed .rs line is a comment, except three user-visible strings cleaned the same way: the zerodb-tools usage text, the MDB_NOSUBDIR error, and the compacting-copy comparator error, which also lost a run of stray spaces. - Approval records: names and chat quotes become "maintainer, <date>" in DIVERGENCES, DECISIONS, ADRs, SPEC and code. Decisions and dates kept. - Docs: CONTRIBUTING points to AGENTS.md. References to removed files are rewritten; in historical records (ADRs, bench reports) they are plain text. SECURITY: write-transaction memory is bounded by spilling now, except a single large value. Checks (Rust 1.99, macOS aarch64): cargo fmt --check clean. cargo clippy --workspace --all-targets -D warnings clean, and the same for the x86_64-unknown-linux-gnu target on the engine crates. cargo test --workspace: 653 passed, 0 failed. cargo doc: the same 37 pre-existing warnings as main, none new.
qdequele
changed the title
Comments (about 140 files; comment lines 15,047 → 14,738): removed dated
history ("since 2026-07-21", "amended …", "pre-fix"), review and process
artifacts (review finding IDs, coverage-pass notes, "do not weaken
(AGENTS.md rule 2)" boilerplate), bug-discovery stories (each regression test
keeps one line on what it guards), and long verbatim mdb.c / lmdb.h quotes
(now one sentence plus the reference). Kept every SAFETY comment and atomic
Ordering justification, every invariant and reason a decision was made,
LMDB-parity facts, spec rule IDs, ADR numbers and complete public API docs.
Comments that contradicted the code are corrected:
- heed-zerodb `Database::put_reserved` # Errors: a failing closure returns
Io and keeps the entry; it does not return Encoding.
- heed-zerodb txn module doc and heed_suite: RwTxn is Send (the writer lock
is thread-agnostic, TXN-6); they described an old !Send design.
- dirty.rs SPARE_CAP: ZeroDB does spill (TXN-68). meta.rs: the CRC covers
[0,172) plus the annex ids. lib.rs and page/mod.rs: page::raw is not the
only unsafe module.
- Three doc comments were attached to the wrong item and are moved. One dead
intra-doc link is removed. The oracle gc_churn band/page size and the
multi_db coverage list are fixed, along with a few other stale harness
descriptions.
Only comments changed in .rs files (checked mechanically; two trailing
comments after an unchanged `},`), plus one fix:
examples/decode_artifact.rs now splits off the engine-mode byte the way the
diff_ops fuzz target does, and prints the mode. It used to decode the mode
byte as an op and print a shifted sequence.
Docs:
- PERF-GAP-VS-LMDB.md goes from 1,160 to 331 lines. It now shows where ZeroDB
stands per area, which technique closed each gap, what was tried and
dropped, and what remains with issue links. Every number cites its report
in benches/results. A lookup table maps the old item codes still cited by
ADRs, SPEC and the perf ledger.
- BENCH-MAP.md goes from 315 to 270 lines: the rung map is kept, history
removed.
- DECISIONS.md and DIVERGENCES.md: index rows cut to one short line each. All
22 divergences are kept, with no status or approval changed.
- benches/results: nothing deleted; every report is either the latest of its
kind or referenced.
Checks (Rust 1.99): fmt clean. clippy -D warnings clean on macOS and on the
x86_64-unknown-linux-gnu engine crates. cargo test --workspace: 653 passed,
0 failed. cargo doc: same 37 pre-existing warnings as main. No broken
relative links in any Markdown file.
- CHANGELOG [0.1.0]: say plainly that it was never released. Drop the claims that crates were published and binaries attached, drop the tag from the patch snippet, and replace the links to the missing v0.1.0 tag. The `## [0.1.0]` heading stays, since the release workflow matches it. - SPEC 01 Table 1, MDB_WRITEMAP: commit flushes the whole map with msync, and a synchronous flush also fdatasyncs on every platform (REC-12). This row now matches §S7 and the landed-flags table.
Merged
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Summary
Gets the repository ready to show publicly. Four commits; overall 227 files, +2,942 / −4,774 lines:
docs/SPEC/now describes the engine as it is.Every change was checked against the code,
git logand the benchmark records inbenches/results/.Commit 3: prepare the repo for public readers (
0df4be9)CLAUDE.mdis renamed toAGENTS.mdand rewritten as a public guide for human and AI contributors: rules,unsafepolicy, checks, repo map and style.PLAN.md,PROGRESS.mdand.claude/(agent definitions and slash commands) are removed; git history keeps them./CLAUDE.mdand/.claude/are gitignored, so local assistant configuration stays local.TXN-41) and ADR numbers stay, because they point to public documents. Every changed.rsline is a comment, except three user-visible strings cleaned the same way: thezerodb-toolsusage text and two error messages.SECURITY.md: write-transaction memory is now bounded by spilling, except for a single large value.cargo fmt --checkis clean.cargo clippy --workspace --all-targets -D warningsis clean, as is the same run on the engine crates forx86_64-unknown-linux-gnu.cargo test --workspace: 653 passed, 0 failed.cargo doc: the same 37 pre-existing warnings asmain(broken intra-doc links to private items), none new.Commit 1: docs sweep (
d61d6e2)docs/PERF-GAP-VS-LMDB.md: the status of each performance item, and the roadmap at the end, now match what landed and what was parked. Line numbers that had drifted are replaced with function names. The old "commits are ~1.8× slower than LMDB" figure is relabelled as a macOS laptop result: on Linux, durable commits run at parity.CHANGELOG.md:[Unreleased]now opens with the breaking change. Format version 1 files are refused at open; migrate withzerodb-tools dumpfrom a format-1 build, thenzerodb-tools load. It also records that thev0.1.0tag was never pushed (no GitHub release, nothing on crates.io).max_dirty_bytes,sequential_writes,file_trust), the CI layout, and Meilisearch's allocator (mimalloc). TOOLS also notes thatloadandcheckhold whole files in memory (Bound peak memory in zerodb-tools load: stream the dump parse and the post-load check #63).docs/adr/0019-meta-write-dsync.md) is marked as implemented and parked, since PR ADR-0019: durable meta write through an O_DSYNC fd (one barrier per commit) #86 was closed.PROGRESS.md: one appended line covering ADR-0021: true in-place WRITE_MAP (spike) — DRAFT, do not merge #88–Bump MSRV to 1.98, CI actions to latest, refresh lockfiles #90 and this sweep.Commit 2: specification update (
acd4c89)The spec was amended to describe the engine as it evolved. The rule applied: where the code changed on purpose, through an accepted design record, an approved divergence, or a merged change, the spec now describes current behavior and cites the source. If the code had been less safe than the spec, that would count as a bug and the spec text would stay. None was found. All 160 rule IDs that code, tests and
zerodb-tools checkcite are kept unchanged.WRITE_MAPand transactions:fdatasyncaftermsyncruns on every platform.WRITE_MAP: the spec described flushing only the changed ranges, which was never built. It now states what ships: the whole map is flushed, which covers more than required. The ranged flush stays planned in Make WRITE_MAP commits msync only changed pages, not the whole map #45. I confirmed the data is still flushed before the meta page is written.memcmporder.docs/PERF-GAP-VS-LMDB.md: records that copying only the used part of a page on copy-on-write was measured flat and reverted (2026-10-02). Until now that result lived only on an unmerged branch.Commit 4: cut history, process notes and restatements (
ea64da1)mdb.cquotes are removed. EverySAFETYcomment, atomic-ordering justification, invariant, reason for a decision, LMDB-parity fact and public API doc is kept.put_reserved's documented error;RwTxnisSend;examples/decode_artifact.rsnow splits off the engine-mode byte the way thediff_opsfuzz target does, and prints the mode. Before, it printed a shifted op sequence.PERF-GAP-VS-LMDB.mdgoes from 1,160 to 331 lines and describes the current state, with every number sourced.BENCH-MAP.mdgoes from 315 to 270 lines.DECISIONS.mdandDIVERGENCES.mdindex rows are trimmed.cargo test --workspace: 653 passed, 0 failed.cargo doc: same warnings asmain.Follow-ups that need a maintainer
qdequele/zerodb-lmdb-divergences-21dc8dbranch (a5fd36c). It should be reviewed before choosing between accepting the divergence and enforcing LMDB's error.unsafeinzerodb-tools: thelibc::flockguard and themigrate-lmdbheedopenare listed inAGENTS.mdas in use and awaiting maintainer review. Either approve them there or ask for their removal.docs/adr/0020-compact-page-header.md): the spike's proxy measurement is under the design's own abandon threshold, but the real milli-dump check was never run.heed-zerodb'sEnv::flags()doesn't reportNO_READ_AHEAD.heed-zerodbassertsRwTxn: Send(heed'srw_txns_are_sendis not ported).env/open/createdrops its temp directory inside the timed region (suites/env.rs).Test plan
git diff --checkis clean.🤖 Generated with Claude Code