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repository: fix prune heuristic to allow resuming interrupted runs

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Pack files created by interrupted prune runs, appear to consist only of
duplicate blobs on the next run. This caused the previous heuristic to
ignore those pack files. Now, a duplicate blob in a specific pack file
is also selected if that pack file only contains duplicate blobs. This
allows prune to select the already rewritten pack files.
This commit is contained in:
Michael Eischer 2024-05-19 23:24:18 +02:00
parent e52033a8bd
commit 027cc64737
1 changed files with 13 additions and 6 deletions
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11
internal/repository/prune.go
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@ -74,8 +74,10 @@ type PrunePlan struct {
type packInfo struct {
usedBlobs uint
unusedBlobs uint
duplicateBlobs uint
usedSize uint64
unusedSize uint64
tpe restic.BlobType
uncompressed bool
}
@ -226,6 +228,7 @@ func packInfoFromIndex(ctx context.Context, idx restic.ListBlobser, usedBlobs re
// mark as unused for now, we will later on select one copy
ip.unusedSize += size
ip.unusedBlobs++
ip.duplicateBlobs++
// count as duplicate, will later on change one copy to be counted as used
stats.Size.Duplicate += size
@ -256,6 +259,8 @@ func packInfoFromIndex(ctx context.Context, idx restic.ListBlobser, usedBlobs re
// if duplicate blobs exist, those will be set to either "used" or "unused":
// - mark only one occurrence of duplicate blobs as used
// - if there are already some used blobs in a pack, possibly mark duplicates in this pack as "used"
// - if a pack only consists of duplicates (which by definition are used blobs), mark it as "used". This
// ensures that already rewritten packs are kept.
// - if there are no used blobs in a pack, possibly mark duplicates as "unused"
if hasDuplicates {
// iterate again over all blobs in index (this is pretty cheap, all in-mem)
@ -271,8 +276,10 @@ func packInfoFromIndex(ctx context.Context, idx restic.ListBlobser, usedBlobs re
ip := indexPack[blob.PackID]
size := uint64(blob.Length)
switch {
case ip.usedBlobs > 0, count == 0:
// other used blobs in pack or "last" occurrence -> transition to used
case ip.usedBlobs > 0, (ip.duplicateBlobs == ip.unusedBlobs), count == 0:
// other used blobs in pack, only duplicate blobs or "last" occurrence -> transition to used
// a pack file created by an interrupted prune run will consist of only duplicate blobs
// thus select such already repacked pack files
ip.usedSize += size
ip.usedBlobs++
ip.unusedSize -= size