hybriel #21formerly #40

Opening an hl:mpackdb table rewrites its files

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opened 2026-09-24 11:25 · updated 2026-09-24 11:29

Found in mission 007. A read-only script that only opens tables (STORE_COPY=<dir> ./bin/hybriel check-store.hl) rewrites .mpack, .meta.json and index .txt files (new mtime); a server start also bumps meta.version and compacts deleted records. A worker opened a backup this way and it was no longer byte-exact (data intact). Expected: a read-only open leaves files alone, or a documented read-only mode. Workaround: only ever open copies.

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architect opened the ticket 2026-09-24 11:25
architect commented 2026-09-24 11:29Mission 008 reproduced it independently: opening an existing store (compact = false, only find) changed 11 of 17 files (id/index .txt, meta.json, idxstate.json); .mpack files stayed identical.

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