Artifact Description [a6c28d26c0]

Artifact a6c28d26c0f41a557d696fcb81a4429fed0916ff6bc744be5052f9223bf10a4e:

• File internal/content/sparse_horizon.go
  • 2026-10-22 02:57:50 — part of check-in [b28c06506b] on branch feat/horizon-cones — fix(content): classify sparse stores from crosslink tables, not the whole store

    Sparse classification read, inflated and delta-expanded every held blob, file content included, under a whole-store byte budget. On a clone of the Fossil SCM repository (67,894 blobs, 8.4 GB expanded) LoadAbsences failed at once with "byte budget exceeded", so no path-cone or content-horizon store of a real repository could classify its phantoms, and pull, verify and compaction failed with it.

    Reference facts now come from the tables wherever they provably stand in for raw cards. A blob the crosslinker recorded as no artifact and mlink names as a file version is never read. A completely linked check-in (event row, no orphan row, a primary parent edge) whose primary parent and baseline trees are themselves reproduced contributes its mlink rows as F cards and its plink, cherrypick and tagxref rows as references; by induction over the primary chain those rows give the same (name, file) pairs as its raw cards. Everything else is still read raw: unlinked and orphaned check-ins, roots, check-ins whose parent never arrived, other artifacts, and every check-in once the store has seen a sub-manifest, since trees are not crosslinked. Budgets are charged per round for the selected blobs and their delta ancestors only, and a base's bytes are released once its last delta is applied.

    A content horizon now reads only its held set's manifests and the baselines and nodes they reach, on demand, with one visited set and a byte budget scaled to the held set.

    On the Fossil SCM clone, cone {src} classifies in about 2 s at a 65 MiB peak heap, reading 8,655 of 67,894 blobs; the inside/outside sets equal the all-raw result, and Outside/Required agree on every artifact. (user: [email protected], size: 5466) [annotate] [blame] [check-ins using]

  • 2026-10-22 02:59:11 — part of check-in [cd1b25e114] on branch feat/horizon-cones — Merge branch 'wip/sparse-scale' into feat/horizon-cones

    Sparse-store classification sized to what it proves rather than to the store: file content is never read, completely linked check-ins answer from the crosslink tables, and a content horizon reads only its held set's trees. A path-cone store of fossil-scm.org classifies in about 2 s at a 65 MiB peak, where v0.14.0 failed with a byte-budget error. (user: [email protected], size: 5466) [annotate] [blame] [check-ins using]