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Repository: read the blobs of a pack from one open stream

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Restores and deep verifies requested every blob separately: a new file handle and a seek on
the location each time. They read the blobs of a snapshot in the order they were written, so
the stream of the pack read last now stays open and is read on; a jump backwards, to another
pack, or more than 8 MiB ahead opens the pack again at the offset, as before. On a Hetzner
Storage Box over SMB, restoring 86 MB in 202 files went from 0.78 MB/s to 4.2 MB/s.
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Dillard Blom
2026-10-08 22:17:53 +02:00
parent 4fa7cbf6ef
commit 5f8d5faee7
4 changed files with 223 additions and 4 deletions
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CHANGELOG.md
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@@ -7,6 +7,15 @@ the app store accepts a `-beta` suffix, but Nextcloud servers then only offer th
beta/daily update channel, which would hide the app from most admins. The stability stage is
instead carried by the app description, the git tag, the release, and this file.
## [Unreleased]
### Fixed
- Restores and `occ backup:verify --deep` fetched every blob with its own request, so on a
remote location they ran far below the speed of the connection. The blobs of a pack are now
read from one open stream, in the order they were written. Restoring 86 MB in 202 files from a
Hetzner Storage Box over SMB went from 0.78 MB/s to 4.2 MB/s, the speed of reading the packs
as plain files over that connection.
## [0.9.3-beta.4] - 2026-10-08
Bugfix release.