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Merge pull request #4354 from MichaelEischer/associated-data 

Reduce prune memory usage
This commit is contained in:
Michael Eischer 2024-05-24 22:26:22 +02:00 committed by GitHub
parent ff4775a15f 436afbff23
commit 55cb8d174a
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
19 changed files with 508 additions and 215 deletions
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7
changelog/unreleased/pull-4354 Normal file
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@ -0,0 +1,7 @@
Enhancement: Significantly reduce prune memory usage
Prune has been optimized to use up to 60% less memory. The memory usage should
now be roughly similar to creating a backup.
https://github.com/restic/restic/pull/4354
https://github.com/restic/restic/pull/4812

18
cmd/restic/cmd_prune.go
View File

@ -188,8 +188,8 @@ func runPruneWithRepo(ctx context.Context, opts PruneOptions, gopts GlobalOption
RepackUncompressed: opts.RepackUncompressed,
}
plan, err := repository.PlanPrune(ctx, popts, repo, func(ctx context.Context, repo restic.Repository) (usedBlobs restic.CountedBlobSet, err error) {
return getUsedBlobs(ctx, repo, ignoreSnapshots, printer)
plan, err := repository.PlanPrune(ctx, popts, repo, func(ctx context.Context, repo restic.Repository, usedBlobs restic.FindBlobSet) error {
return getUsedBlobs(ctx, repo, usedBlobs, ignoreSnapshots, printer)
}, printer)
if err != nil {
return err
@ -255,10 +255,10 @@ func printPruneStats(printer progress.Printer, stats repository.PruneStats) erro
return nil
}
func getUsedBlobs(ctx context.Context, repo restic.Repository, ignoreSnapshots restic.IDSet, printer progress.Printer) (usedBlobs restic.CountedBlobSet, err error) {
func getUsedBlobs(ctx context.Context, repo restic.Repository, usedBlobs restic.FindBlobSet, ignoreSnapshots restic.IDSet, printer progress.Printer) error {
var snapshotTrees restic.IDs
printer.P("loading all snapshots...\n")
err = restic.ForAllSnapshots(ctx, repo, repo, ignoreSnapshots,
err := restic.ForAllSnapshots(ctx, repo, repo, ignoreSnapshots,
func(id restic.ID, sn *restic.Snapshot, err error) error {
if err != nil {
debug.Log("failed to load snapshot %v (error %v)", id, err)
@ -269,20 +269,14 @@ func getUsedBlobs(ctx context.Context, repo restic.Repository, ignoreSnapshots r
return nil
})
if err != nil {
return nil, errors.Fatalf("failed loading snapshot: %v", err)
return errors.Fatalf("failed loading snapshot: %v", err)
}
printer.P("finding data that is still in use for %d snapshots\n", len(snapshotTrees))
usedBlobs = restic.NewCountedBlobSet()
bar := printer.NewCounter("snapshots")
bar.SetMax(uint64(len(snapshotTrees)))
defer bar.Done()
err = restic.FindUsedBlobs(ctx, repo, snapshotTrees, usedBlobs, bar)
if err != nil {
return nil, err
}
return usedBlobs, nil
return restic.FindUsedBlobs(ctx, repo, snapshotTrees, usedBlobs, bar)
}

2
cmd/restic/cmd_repair_index_integration_test.go
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@ -68,7 +68,7 @@ func TestRebuildIndexAlwaysFull(t *testing.T) {
defer func() {
index.IndexFull = indexFull
}()
index.IndexFull = func(*index.Index, bool) bool { return true }
index.IndexFull = func(*index.Index) bool { return true }
testRebuildIndex(t, nil)
}

156
internal/index/associated_data.go Normal file
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@ -0,0 +1,156 @@
package index
import (
"context"
"sort"
"github.com/restic/restic/internal/restic"
)
type associatedSetSub[T any] struct {
value []T
isSet []bool
}
// AssociatedSet is a memory efficient implementation of a BlobSet that can
// store a small data item for each BlobHandle. It relies on a special property
// of our MasterIndex implementation. A BlobHandle can be permanently identified
// using an offset that never changes as MasterIndex entries cannot be modified (only added).
//
// The AssociatedSet thus can use an array with the size of the MasterIndex to store
// its data. Access to an individual entry is possible by looking up the BlobHandle's
// offset from the MasterIndex.
//
// BlobHandles that are not part of the MasterIndex can be stored by placing them in
// an overflow set that is expected to be empty in the normal case.
type AssociatedSet[T any] struct {
byType [restic.NumBlobTypes]associatedSetSub[T]
overflow map[restic.BlobHandle]T
idx *MasterIndex
}
func NewAssociatedSet[T any](mi *MasterIndex) *AssociatedSet[T] {
a := AssociatedSet[T]{
overflow: make(map[restic.BlobHandle]T),
idx: mi,
}
for typ := range a.byType {
if typ == 0 {
continue
}
// index starts counting at 1
count := mi.stableLen(restic.BlobType(typ)) + 1
a.byType[typ].value = make([]T, count)
a.byType[typ].isSet = make([]bool, count)
}
return &a
}
func (a *AssociatedSet[T]) Get(bh restic.BlobHandle) (T, bool) {
if val, ok := a.overflow[bh]; ok {
return val, true
}
idx := a.idx.blobIndex(bh)
bt := &a.byType[bh.Type]
if idx >= len(bt.value) || idx == -1 {
var zero T
return zero, false
}
has := bt.isSet[idx]
if has {
return bt.value[idx], has
}
var zero T
return zero, false
}
func (a *AssociatedSet[T]) Has(bh restic.BlobHandle) bool {
_, ok := a.Get(bh)
return ok
}
func (a *AssociatedSet[T]) Set(bh restic.BlobHandle, val T) {
if _, ok := a.overflow[bh]; ok {
a.overflow[bh] = val
return
}
idx := a.idx.blobIndex(bh)
bt := &a.byType[bh.Type]
if idx >= len(bt.value) || idx == -1 {
a.overflow[bh] = val
} else {
bt.value[idx] = val
bt.isSet[idx] = true
}
}
func (a *AssociatedSet[T]) Insert(bh restic.BlobHandle) {
var zero T
a.Set(bh, zero)
}
func (a *AssociatedSet[T]) Delete(bh restic.BlobHandle) {
if _, ok := a.overflow[bh]; ok {
delete(a.overflow, bh)
return
}
idx := a.idx.blobIndex(bh)
bt := &a.byType[bh.Type]
if idx < len(bt.value) && idx != -1 {
bt.isSet[idx] = false
}
}
func (a *AssociatedSet[T]) Len() int {
count := 0
a.For(func(_ restic.BlobHandle, _ T) {
count++
})
return count
}
func (a *AssociatedSet[T]) For(cb func(bh restic.BlobHandle, val T)) {
for k, v := range a.overflow {
cb(k, v)
}
_ = a.idx.Each(context.Background(), func(pb restic.PackedBlob) {
if _, ok := a.overflow[pb.BlobHandle]; ok {
// already reported via overflow set
return
}
val, known := a.Get(pb.BlobHandle)
if known {
cb(pb.BlobHandle, val)
}
})
}
// List returns a sorted slice of all BlobHandle in the set.
func (a *AssociatedSet[T]) List() restic.BlobHandles {
list := make(restic.BlobHandles, 0)
a.For(func(bh restic.BlobHandle, _ T) {
list = append(list, bh)
})
return list
}
func (a *AssociatedSet[T]) String() string {
list := a.List()
sort.Sort(list)
str := list.String()
if len(str) < 2 {
return "{}"
}
return "{" + str[1:len(str)-1] + "}"
}

154
internal/index/associated_data_test.go Normal file
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@ -0,0 +1,154 @@
package index
import (
"context"
"testing"
"github.com/restic/restic/internal/crypto"
"github.com/restic/restic/internal/restic"
"github.com/restic/restic/internal/test"
)
type noopSaver struct{}
func (n *noopSaver) Connections() uint {
return 2
}
func (n *noopSaver) SaveUnpacked(ctx context.Context, t restic.FileType, buf []byte) (restic.ID, error) {
return restic.Hash(buf), nil
}
func makeFakePackedBlob() (restic.BlobHandle, restic.PackedBlob) {
bh := restic.NewRandomBlobHandle()
blob := restic.PackedBlob{
PackID: restic.NewRandomID(),
Blob: restic.Blob{
BlobHandle: bh,
Length: uint(crypto.CiphertextLength(10)),
Offset: 0,
},
}
return bh, blob
}
func TestAssociatedSet(t *testing.T) {
bh, blob := makeFakePackedBlob()
mi := NewMasterIndex()
mi.StorePack(blob.PackID, []restic.Blob{blob.Blob})
test.OK(t, mi.SaveIndex(context.TODO(), &noopSaver{}))
bs := NewAssociatedSet[uint8](mi)
test.Equals(t, bs.Len(), 0)
test.Equals(t, bs.List(), restic.BlobHandles{})
// check non existent
test.Equals(t, bs.Has(bh), false)
_, ok := bs.Get(bh)
test.Equals(t, false, ok)
// test insert
bs.Insert(bh)
test.Equals(t, bs.Has(bh), true)
test.Equals(t, bs.Len(), 1)
test.Equals(t, bs.List(), restic.BlobHandles{bh})
test.Equals(t, 0, len(bs.overflow))
// test set
bs.Set(bh, 42)
test.Equals(t, bs.Has(bh), true)
test.Equals(t, bs.Len(), 1)
val, ok := bs.Get(bh)
test.Equals(t, true, ok)
test.Equals(t, uint8(42), val)
s := bs.String()
test.Assert(t, len(s) > 10, "invalid string: %v", s)
// test remove
bs.Delete(bh)
test.Equals(t, bs.Len(), 0)
test.Equals(t, bs.Has(bh), false)
test.Equals(t, bs.List(), restic.BlobHandles{})
test.Equals(t, "{}", bs.String())
// test set
bs.Set(bh, 43)
test.Equals(t, bs.Has(bh), true)
test.Equals(t, bs.Len(), 1)
val, ok = bs.Get(bh)
test.Equals(t, true, ok)
test.Equals(t, uint8(43), val)
test.Equals(t, 0, len(bs.overflow))
// test update
bs.Set(bh, 44)
val, ok = bs.Get(bh)
test.Equals(t, true, ok)
test.Equals(t, uint8(44), val)
test.Equals(t, 0, len(bs.overflow))
// test overflow blob
of := restic.NewRandomBlobHandle()
test.Equals(t, false, bs.Has(of))
// set
bs.Set(of, 7)
test.Equals(t, 1, len(bs.overflow))
test.Equals(t, bs.Len(), 2)
// get
val, ok = bs.Get(of)
test.Equals(t, true, ok)
test.Equals(t, uint8(7), val)
test.Equals(t, bs.List(), restic.BlobHandles{of, bh})
// update
bs.Set(of, 8)
val, ok = bs.Get(of)
test.Equals(t, true, ok)
test.Equals(t, uint8(8), val)
test.Equals(t, 1, len(bs.overflow))
// delete
bs.Delete(of)
test.Equals(t, bs.Len(), 1)
test.Equals(t, bs.Has(of), false)
test.Equals(t, bs.List(), restic.BlobHandles{bh})
test.Equals(t, 0, len(bs.overflow))
}
func TestAssociatedSetWithExtendedIndex(t *testing.T) {
_, blob := makeFakePackedBlob()
mi := NewMasterIndex()
mi.StorePack(blob.PackID, []restic.Blob{blob.Blob})
test.OK(t, mi.SaveIndex(context.TODO(), &noopSaver{}))
bs := NewAssociatedSet[uint8](mi)
// add new blobs to index after building the set
of, blob2 := makeFakePackedBlob()
mi.StorePack(blob2.PackID, []restic.Blob{blob2.Blob})
test.OK(t, mi.SaveIndex(context.TODO(), &noopSaver{}))
// non-existant
test.Equals(t, false, bs.Has(of))
// set
bs.Set(of, 5)
test.Equals(t, 1, len(bs.overflow))
test.Equals(t, bs.Len(), 1)
// get
val, ok := bs.Get(of)
test.Equals(t, true, ok)
test.Equals(t, uint8(5), val)
test.Equals(t, bs.List(), restic.BlobHandles{of})
// update
bs.Set(of, 8)
val, ok = bs.Get(of)
test.Equals(t, true, ok)
test.Equals(t, uint8(8), val)
test.Equals(t, 1, len(bs.overflow))
// delete
bs.Delete(of)
test.Equals(t, bs.Len(), 0)
test.Equals(t, bs.Has(of), false)
test.Equals(t, bs.List(), restic.BlobHandles{})
test.Equals(t, 0, len(bs.overflow))
}

75
internal/index/index.go
View File

@ -47,7 +47,7 @@ import (
// Index holds lookup tables for id -> pack.
type Index struct {
m sync.Mutex
m sync.RWMutex
byType [restic.NumBlobTypes]indexMap
packs restic.IDs
@ -83,22 +83,21 @@ func (idx *Index) store(packIndex int, blob restic.Blob) {
// Final returns true iff the index is already written to the repository, it is
// finalized.
func (idx *Index) Final() bool {
idx.m.Lock()
defer idx.m.Unlock()
idx.m.RLock()
defer idx.m.RUnlock()
return idx.final
}
const (
indexMaxBlobs = 50000
indexMaxBlobsCompressed = 3 * indexMaxBlobs
indexMaxAge = 10 * time.Minute
indexMaxBlobs = 50000
indexMaxAge = 10 * time.Minute
)
// IndexFull returns true iff the index is "full enough" to be saved as a preliminary index.
var IndexFull = func(idx *Index, compress bool) bool {
idx.m.Lock()
defer idx.m.Unlock()
var IndexFull = func(idx *Index) bool {
idx.m.RLock()
defer idx.m.RUnlock()
debug.Log("checking whether index %p is full", idx)
@ -107,18 +106,12 @@ var IndexFull = func(idx *Index, compress bool) bool {
blobs += idx.byType[typ].len()
}
age := time.Since(idx.created)
var maxBlobs uint
if compress {
maxBlobs = indexMaxBlobsCompressed
} else {
maxBlobs = indexMaxBlobs
}
switch {
case age >= indexMaxAge:
debug.Log("index %p is old enough", idx, age)
return true
case blobs >= maxBlobs:
case blobs >= indexMaxBlobs:
debug.Log("index %p has %d blobs", idx, blobs)
return true
}
@ -163,8 +156,8 @@ func (idx *Index) toPackedBlob(e *indexEntry, t restic.BlobType) restic.PackedBl
// Lookup queries the index for the blob ID and returns all entries including
// duplicates. Adds found entries to blobs and returns the result.
func (idx *Index) Lookup(bh restic.BlobHandle, pbs []restic.PackedBlob) []restic.PackedBlob {
idx.m.Lock()
defer idx.m.Unlock()
idx.m.RLock()
defer idx.m.RUnlock()
idx.byType[bh.Type].foreachWithID(bh.ID, func(e *indexEntry) {
pbs = append(pbs, idx.toPackedBlob(e, bh.Type))
@ -175,8 +168,8 @@ func (idx *Index) Lookup(bh restic.BlobHandle, pbs []restic.PackedBlob) []restic
// Has returns true iff the id is listed in the index.
func (idx *Index) Has(bh restic.BlobHandle) bool {
idx.m.Lock()
defer idx.m.Unlock()
idx.m.RLock()
defer idx.m.RUnlock()
return idx.byType[bh.Type].get(bh.ID) != nil
}
@ -184,8 +177,8 @@ func (idx *Index) Has(bh restic.BlobHandle) bool {
// LookupSize returns the length of the plaintext content of the blob with the
// given id.
func (idx *Index) LookupSize(bh restic.BlobHandle) (plaintextLength uint, found bool) {
idx.m.Lock()
defer idx.m.Unlock()
idx.m.RLock()
defer idx.m.RUnlock()
e := idx.byType[bh.Type].get(bh.ID)
if e == nil {
@ -200,8 +193,8 @@ func (idx *Index) LookupSize(bh restic.BlobHandle) (plaintextLength uint, found
// Each passes all blobs known to the index to the callback fn. This blocks any
// modification of the index.
func (idx *Index) Each(ctx context.Context, fn func(restic.PackedBlob)) error {
idx.m.Lock()
defer idx.m.Unlock()
idx.m.RLock()
defer idx.m.RUnlock()
for typ := range idx.byType {
m := &idx.byType[typ]
@ -229,12 +222,12 @@ type EachByPackResult struct {
// When the context is cancelled, the background goroutine
// terminates. This blocks any modification of the index.
func (idx *Index) EachByPack(ctx context.Context, packBlacklist restic.IDSet) <-chan EachByPackResult {
idx.m.Lock()
idx.m.RLock()
ch := make(chan EachByPackResult)
go func() {
defer idx.m.Unlock()
defer idx.m.RUnlock()
defer close(ch)
byPack := make(map[restic.ID][restic.NumBlobTypes][]*indexEntry)
@ -275,8 +268,8 @@ func (idx *Index) EachByPack(ctx context.Context, packBlacklist restic.IDSet) <-
// Packs returns all packs in this index
func (idx *Index) Packs() restic.IDSet {
idx.m.Lock()
defer idx.m.Unlock()
idx.m.RLock()
defer idx.m.RUnlock()
packs := restic.NewIDSet()
for _, packID := range idx.packs {
@ -344,8 +337,8 @@ type jsonIndex struct {
// Encode writes the JSON serialization of the index to the writer w.
func (idx *Index) Encode(w io.Writer) error {
debug.Log("encoding index")
idx.m.Lock()
defer idx.m.Unlock()
idx.m.RLock()
defer idx.m.RUnlock()
list, err := idx.generatePackList()
if err != nil {
@ -389,8 +382,8 @@ func (idx *Index) Finalize() {
// IDs returns the IDs of the index, if available. If the index is not yet
// finalized, an error is returned.
func (idx *Index) IDs() (restic.IDs, error) {
idx.m.Lock()
defer idx.m.Unlock()
idx.m.RLock()
defer idx.m.RUnlock()
if !idx.final {
return nil, errors.New("index not finalized")
@ -422,8 +415,8 @@ func (idx *Index) SetID(id restic.ID) error {
// Dump writes the pretty-printed JSON representation of the index to w.
func (idx *Index) Dump(w io.Writer) error {
debug.Log("dumping index")
idx.m.Lock()
defer idx.m.Unlock()
idx.m.RLock()
defer idx.m.RUnlock()
list, err := idx.generatePackList()
if err != nil {
@ -579,3 +572,17 @@ func decodeOldIndex(buf []byte) (idx *Index, err error) {
debug.Log("done")
return idx, nil
}
func (idx *Index) BlobIndex(bh restic.BlobHandle) int {
idx.m.RLock()
defer idx.m.RUnlock()
return idx.byType[bh.Type].firstIndex(bh.ID)
}
func (idx *Index) Len(t restic.BlobType) uint {
idx.m.RLock()
defer idx.m.RUnlock()
return idx.byType[t].len()
}

3
internal/index/index_test.go
View File

@ -172,6 +172,9 @@ func TestIndexSize(t *testing.T) {
err := idx.Encode(wr)
rtest.OK(t, err)
rtest.Equals(t, uint(packs*blobCount), idx.Len(restic.DataBlob))
rtest.Equals(t, uint(0), idx.Len(restic.TreeBlob))
t.Logf("Index file size for %d blobs in %d packs is %d", blobCount*packs, packs, wr.Len())
}

33
internal/index/indexmap.go
View File

@ -99,6 +99,32 @@ func (m *indexMap) get(id restic.ID) *indexEntry {
return nil
}
// firstIndex returns the index of the first entry for ID id.
// This index is guaranteed to never change.
func (m *indexMap) firstIndex(id restic.ID) int {
if len(m.buckets) == 0 {
return -1
}
idx := -1
h := m.hash(id)
ei := m.buckets[h]
for ei != 0 {
e := m.resolve(ei)
cur := ei
ei = e.next
if e.id != id {
continue
}
if int(cur) < idx || idx == -1 {
// casting from uint to int is unproblematic as we'd run out of memory
// before this can result in an overflow.
idx = int(cur)
}
}
return idx
}
func (m *indexMap) grow() {
m.buckets = make([]uint, growthFactor*len(m.buckets))
@ -118,9 +144,10 @@ func (m *indexMap) hash(id restic.ID) uint {
// While SHA-256 should be collision-resistant, for hash table indices
// we use only a few bits of it and finding collisions for those is
// much easier than breaking the whole algorithm.
m.mh.Reset()
_, _ = m.mh.Write(id[:])
h := uint(m.mh.Sum64())
mh := maphash.Hash{}
mh.SetSeed(m.mh.Seed())
_, _ = mh.Write(id[:])
h := uint(mh.Sum64())
return h & uint(len(m.buckets)-1)
}

42
internal/index/indexmap_test.go
View File

@ -143,3 +143,45 @@ func BenchmarkIndexMapHash(b *testing.B) {
}
}
}
func TestIndexMapFirstIndex(t *testing.T) {
t.Parallel()
var (
id restic.ID
m indexMap
r = rand.New(rand.NewSource(98765))
fi = make(map[restic.ID]int)
)
for i := 1; i <= 400; i++ {
r.Read(id[:])
rtest.Equals(t, -1, m.firstIndex(id), "wrong firstIndex for nonexistant id")
m.add(id, 0, 0, 0, 0)
idx := m.firstIndex(id)
rtest.Equals(t, i, idx, "unexpected index for id")
fi[id] = idx
}
// iterate over blobs, as this is a hashmap the order is effectively random
for id, idx := range fi {
rtest.Equals(t, idx, m.firstIndex(id), "wrong index returned")
}
}
func TestIndexMapFirstIndexDuplicates(t *testing.T) {
t.Parallel()
var (
id restic.ID
m indexMap
r = rand.New(rand.NewSource(98765))
)
r.Read(id[:])
for i := 1; i <= 10; i++ {
m.add(id, 0, 0, 0, 0)
}
idx := m.firstIndex(id)
rtest.Equals(t, 1, idx, "unexpected index for id")
}

31
internal/index/master_index.go
View File

@ -17,7 +17,6 @@ type MasterIndex struct {
idx []*Index
pendingBlobs restic.BlobSet
idxMutex sync.RWMutex
compress bool
}
// NewMasterIndex creates a new master index.
@ -33,10 +32,6 @@ func (mi *MasterIndex) clear() {
mi.idx[0].Finalize()
}
func (mi *MasterIndex) MarkCompressed() {
mi.compress = true
}
// Lookup queries all known Indexes for the ID and returns all matches.
func (mi *MasterIndex) Lookup(bh restic.BlobHandle) (pbs []restic.PackedBlob) {
mi.idxMutex.RLock()
@ -211,7 +206,7 @@ func (mi *MasterIndex) finalizeFullIndexes() []*Index {
continue
}
if IndexFull(idx, mi.compress) {
if IndexFull(idx) {
debug.Log("index %p is full", idx)
idx.Finalize()
list = append(list, idx)
@ -417,7 +412,7 @@ func (mi *MasterIndex) Rewrite(ctx context.Context, repo restic.Unpacked, exclud
newIndex := NewIndex()
for task := range rewriteCh {
// always rewrite indexes using the old format, that include a pack that must be removed or that are not full
if !task.oldFormat && len(task.idx.Packs().Intersect(excludePacks)) == 0 && IndexFull(task.idx, mi.compress) {
if !task.oldFormat && len(task.idx.Packs().Intersect(excludePacks)) == 0 && IndexFull(task.idx) {
// make sure that each pack is only stored exactly once in the index
excludePacks.Merge(task.idx.Packs())
// index is already up to date
@ -433,7 +428,7 @@ func (mi *MasterIndex) Rewrite(ctx context.Context, repo restic.Unpacked, exclud
for pbs := range task.idx.EachByPack(wgCtx, excludePacks) {
newIndex.StorePack(pbs.PackID, pbs.Blobs)
if IndexFull(newIndex, mi.compress) {
if IndexFull(newIndex) {
select {
case saveCh <- newIndex:
case <-wgCtx.Done():
@ -527,7 +522,7 @@ func (mi *MasterIndex) SaveFallback(ctx context.Context, repo restic.SaverRemove
for pbs := range idx.EachByPack(wgCtx, excludePacks) {
newIndex.StorePack(pbs.PackID, pbs.Blobs)
p.Add(1)
if IndexFull(newIndex, mi.compress) {
if IndexFull(newIndex) {
select {
case ch <- newIndex:
case <-wgCtx.Done():
@ -638,3 +633,21 @@ func (mi *MasterIndex) ListPacks(ctx context.Context, packs restic.IDSet) <-chan
}()
return out
}
// Only for use by AssociatedSet
func (mi *MasterIndex) blobIndex(h restic.BlobHandle) int {
mi.idxMutex.RLock()
defer mi.idxMutex.RUnlock()
// other indexes are ignored as their ids can change when merged into the main index
return mi.idx[0].BlobIndex(h)
}
// Only for use by AssociatedSet
func (mi *MasterIndex) stableLen(t restic.BlobType) uint {
mi.idxMutex.RLock()
defer mi.idxMutex.RUnlock()
// other indexes are ignored as their ids can change when merged into the main index
return mi.idx[0].Len(t)
}

9
internal/index/master_index_test.go
View File

@ -161,9 +161,12 @@ func TestMasterMergeFinalIndexes(t *testing.T) {
mIdx.Insert(idx1)
mIdx.Insert(idx2)
finalIndexes, idxCount := index.TestMergeIndex(t, mIdx)
rtest.Equals(t, restic.NewIDSet(), mIdx.IDs())
finalIndexes, idxCount, ids := index.TestMergeIndex(t, mIdx)
rtest.Equals(t, []*index.Index{idx1, idx2}, finalIndexes)
rtest.Equals(t, 1, idxCount)
rtest.Equals(t, ids, mIdx.IDs())
blobCount := 0
rtest.OK(t, mIdx.Each(context.TODO(), func(pb restic.PackedBlob) {
@ -186,9 +189,11 @@ func TestMasterMergeFinalIndexes(t *testing.T) {
idx3.StorePack(blob2.PackID, []restic.Blob{blob2.Blob})
mIdx.Insert(idx3)
finalIndexes, idxCount = index.TestMergeIndex(t, mIdx)
finalIndexes, idxCount, newIDs := index.TestMergeIndex(t, mIdx)
rtest.Equals(t, []*index.Index{idx3}, finalIndexes)
rtest.Equals(t, 1, idxCount)
ids.Merge(newIDs)
rtest.Equals(t, ids, mIdx.IDs())
// Index should have same entries as before!
blobs = mIdx.Lookup(bhInIdx1)

9
internal/index/testing.go
View File

@ -7,12 +7,15 @@ import (
"github.com/restic/restic/internal/test"
)
func TestMergeIndex(t testing.TB, mi *MasterIndex) ([]*Index, int) {
func TestMergeIndex(t testing.TB, mi *MasterIndex) ([]*Index, int, restic.IDSet) {
finalIndexes := mi.finalizeNotFinalIndexes()
ids := restic.NewIDSet()
for _, idx := range finalIndexes {
test.OK(t, idx.SetID(restic.NewRandomID()))
id := restic.NewRandomID()
ids.Insert(id)
test.OK(t, idx.SetID(id))
}
test.OK(t, mi.MergeFinalIndexes())
return finalIndexes, len(mi.idx)
return finalIndexes, len(mi.idx), ids
}

50
internal/repository/prune.go
View File

@ -7,6 +7,7 @@ import (
"sort"
"github.com/restic/restic/internal/errors"
"github.com/restic/restic/internal/index"
"github.com/restic/restic/internal/pack"
"github.com/restic/restic/internal/restic"
"github.com/restic/restic/internal/ui/progress"
@ -60,11 +61,11 @@ type PruneStats struct {
}
type PrunePlan struct {
removePacksFirst restic.IDSet // packs to remove first (unreferenced packs)
repackPacks restic.IDSet // packs to repack
keepBlobs restic.CountedBlobSet // blobs to keep during repacking
removePacks restic.IDSet // packs to remove
ignorePacks restic.IDSet // packs to ignore when rebuilding the index
removePacksFirst restic.IDSet // packs to remove first (unreferenced packs)
repackPacks restic.IDSet // packs to repack
keepBlobs *index.AssociatedSet[uint8] // blobs to keep during repacking
removePacks restic.IDSet // packs to remove
ignorePacks restic.IDSet // packs to ignore when rebuilding the index
repo *Repository
stats PruneStats
@ -90,7 +91,7 @@ type packInfoWithID struct {
// PlanPrune selects which files to rewrite and which to delete and which blobs to keep.
// Also some summary statistics are returned.
func PlanPrune(ctx context.Context, opts PruneOptions, repo *Repository, getUsedBlobs func(ctx context.Context, repo restic.Repository) (usedBlobs restic.CountedBlobSet, err error), printer progress.Printer) (*PrunePlan, error) {
func PlanPrune(ctx context.Context, opts PruneOptions, repo *Repository, getUsedBlobs func(ctx context.Context, repo restic.Repository, usedBlobs restic.FindBlobSet) error, printer progress.Printer) (*PrunePlan, error) {
var stats PruneStats
if opts.UnsafeRecovery {
@ -104,7 +105,8 @@ func PlanPrune(ctx context.Context, opts PruneOptions, repo *Repository, getUsed
return nil, fmt.Errorf("compression requires at least repository format version 2")
}
usedBlobs, err := getUsedBlobs(ctx, repo)
usedBlobs := index.NewAssociatedSet[uint8](repo.idx)
err := getUsedBlobs(ctx, repo, usedBlobs)
if err != nil {
return nil, err
}
@ -122,7 +124,6 @@ func PlanPrune(ctx context.Context, opts PruneOptions, repo *Repository, getUsed
}
if len(plan.repackPacks) != 0 {
blobCount := keepBlobs.Len()
// when repacking, we do not want to keep blobs which are
// already contained in kept packs, so delete them from keepBlobs
err := repo.ListBlobs(ctx, func(blob restic.PackedBlob) {
@ -134,11 +135,6 @@ func PlanPrune(ctx context.Context, opts PruneOptions, repo *Repository, getUsed
if err != nil {
return nil, err
}
if keepBlobs.Len() < blobCount/2 {
// replace with copy to shrink map to necessary size if there's a chance to benefit
keepBlobs = keepBlobs.Copy()
}
} else {
// keepBlobs is only needed if packs are repacked
keepBlobs = nil
@ -152,13 +148,13 @@ func PlanPrune(ctx context.Context, opts PruneOptions, repo *Repository, getUsed
return &plan, nil
}
func packInfoFromIndex(ctx context.Context, idx restic.ListBlobser, usedBlobs restic.CountedBlobSet, stats *PruneStats, printer progress.Printer) (restic.CountedBlobSet, map[restic.ID]packInfo, error) {
func packInfoFromIndex(ctx context.Context, idx restic.ListBlobser, usedBlobs *index.AssociatedSet[uint8], stats *PruneStats, printer progress.Printer) (*index.AssociatedSet[uint8], map[restic.ID]packInfo, error) {
// iterate over all blobs in index to find out which blobs are duplicates
// The counter in usedBlobs describes how many instances of the blob exist in the repository index
// Thus 0 == blob is missing, 1 == blob exists once, >= 2 == duplicates exist
err := idx.ListBlobs(ctx, func(blob restic.PackedBlob) {
bh := blob.BlobHandle
count, ok := usedBlobs[bh]
count, ok := usedBlobs.Get(bh)
if ok {
if count < math.MaxUint8 {
// don't overflow, but saturate count at 255
@ -167,7 +163,7 @@ func packInfoFromIndex(ctx context.Context, idx restic.ListBlobser, usedBlobs re
count++
}
usedBlobs[bh] = count
usedBlobs.Set(bh, count)
}
})
if err != nil {
@ -176,12 +172,12 @@ func packInfoFromIndex(ctx context.Context, idx restic.ListBlobser, usedBlobs re
// Check if all used blobs have been found in index
missingBlobs := restic.NewBlobSet()
for bh, count := range usedBlobs {
usedBlobs.For(func(bh restic.BlobHandle, count uint8) {
if count == 0 {
// blob does not exist in any pack files
missingBlobs.Insert(bh)
}
}
})
if len(missingBlobs) != 0 {
printer.E("%v not found in the index\n\n"+
@ -221,7 +217,7 @@ func packInfoFromIndex(ctx context.Context, idx restic.ListBlobser, usedBlobs re
bh := blob.BlobHandle
size := uint64(blob.Length)
dupCount := usedBlobs[bh]
dupCount, _ := usedBlobs.Get(bh)
switch {
case dupCount >= 2:
hasDuplicates = true
@ -266,7 +262,7 @@ func packInfoFromIndex(ctx context.Context, idx restic.ListBlobser, usedBlobs re
// iterate again over all blobs in index (this is pretty cheap, all in-mem)
err = idx.ListBlobs(ctx, func(blob restic.PackedBlob) {
bh := blob.BlobHandle
count, ok := usedBlobs[bh]
count, ok := usedBlobs.Get(bh)
// skip non-duplicate, aka. normal blobs
// count == 0 is used to mark that this was a duplicate blob with only a single occurrence remaining
if !ok || count == 1 {
@ -290,7 +286,7 @@ func packInfoFromIndex(ctx context.Context, idx restic.ListBlobser, usedBlobs re
stats.Size.Duplicate -= size
stats.Blobs.Duplicate--
// let other occurrences remain marked as unused
usedBlobs[bh] = 1
usedBlobs.Set(bh, 1)
default:
// remain unused and decrease counter
count--
@ -299,7 +295,7 @@ func packInfoFromIndex(ctx context.Context, idx restic.ListBlobser, usedBlobs re
// thus use the special value zero. This will select the last instance of the blob for keeping.
count = 0
}
usedBlobs[bh] = count
usedBlobs.Set(bh, count)
}
// update indexPack
indexPack[blob.PackID] = ip
@ -311,11 +307,11 @@ func packInfoFromIndex(ctx context.Context, idx restic.ListBlobser, usedBlobs re
// Sanity check. If no duplicates exist, all blobs have value 1. After handling
// duplicates, this also applies to duplicates.
for _, count := range usedBlobs {
usedBlobs.For(func(_ restic.BlobHandle, count uint8) {
if count != 1 {
panic("internal error during blob selection")
}
}
})
return usedBlobs, indexPack, nil
}
@ -549,6 +545,8 @@ func (plan *PrunePlan) Execute(ctx context.Context, printer progress.Printer) er
if len(plan.removePacksFirst) != 0 {
printer.P("deleting unreferenced packs\n")
_ = deleteFiles(ctx, true, repo, plan.removePacksFirst, restic.PackFile, printer)
// forget unused data
plan.removePacksFirst = nil
}
if ctx.Err() != nil {
return ctx.Err()
@ -566,8 +564,10 @@ func (plan *PrunePlan) Execute(ctx context.Context, printer progress.Printer) er
// Also remove repacked packs
plan.removePacks.Merge(plan.repackPacks)
// forget unused data
plan.repackPacks = nil
if len(plan.keepBlobs) != 0 {
if plan.keepBlobs.Len() != 0 {
printer.E("%v was not repacked\n\n"+
"Integrity check failed.\n"+
"Please report this error (along with the output of the 'prune' run) at\n"+

7
internal/repository/prune_test.go
View File

@ -30,8 +30,11 @@ func testPrune(t *testing.T, opts repository.PruneOptions, errOnUnused bool) {
}
rtest.OK(t, repo.Flush(context.TODO()))
plan, err := repository.PlanPrune(context.TODO(), opts, repo, func(ctx context.Context, repo restic.Repository) (usedBlobs restic.CountedBlobSet, err error) {
return restic.NewCountedBlobSet(keep.List()...), nil
plan, err := repository.PlanPrune(context.TODO(), opts, repo, func(ctx context.Context, repo restic.Repository, usedBlobs restic.FindBlobSet) error {
for blob := range keep {
usedBlobs.Insert(blob)
}
return nil
}, &progress.NoopPrinter{})
rtest.OK(t, err)

8
internal/repository/repository.go
View File

@ -588,19 +588,11 @@ func (r *Repository) ListPacksFromIndex(ctx context.Context, packs restic.IDSet)
// SetIndex instructs the repository to use the given index.
func (r *Repository) SetIndex(i restic.MasterIndex) error {
r.idx = i.(*index.MasterIndex)
r.configureIndex()
return r.prepareCache()
}
func (r *Repository) clearIndex() {
r.idx = index.NewMasterIndex()
r.configureIndex()
}
func (r *Repository) configureIndex() {
if r.cfg.Version >= 2 {
r.idx.MarkCompressed()
}
}
// LoadIndex loads all index files from the backend in parallel and stores them

2
internal/repository/repository_test.go
View File

@ -376,7 +376,7 @@ func TestRepositoryIncrementalIndex(t *testing.T) {
func testRepositoryIncrementalIndex(t *testing.T, version uint) {
repo, _ := repository.TestRepositoryWithVersion(t, version)
index.IndexFull = func(*index.Index, bool) bool { return true }
index.IndexFull = func(*index.Index) bool { return true }
// add a few rounds of packs
for j := 0; j < 5; j++ {

68
internal/restic/counted_blob_set.go
View File

@ -1,68 +0,0 @@
package restic
import "sort"
// CountedBlobSet is a set of blobs. For each blob it also stores a uint8 value
// which can be used to track some information. The CountedBlobSet does not use
// that value in any way. New entries are created with value 0.
type CountedBlobSet map[BlobHandle]uint8
// NewCountedBlobSet returns a new CountedBlobSet, populated with ids.
func NewCountedBlobSet(handles ...BlobHandle) CountedBlobSet {
m := make(CountedBlobSet)
for _, h := range handles {
m[h] = 0
}
return m
}
// Has returns true iff id is contained in the set.
func (s CountedBlobSet) Has(h BlobHandle) bool {
_, ok := s[h]
return ok
}
// Insert adds id to the set.
func (s CountedBlobSet) Insert(h BlobHandle) {
s[h] = 0
}
// Delete removes id from the set.
func (s CountedBlobSet) Delete(h BlobHandle) {
delete(s, h)
}
func (s CountedBlobSet) Len() int {
return len(s)
}
// List returns a sorted slice of all BlobHandle in the set.
func (s CountedBlobSet) List() BlobHandles {
list := make(BlobHandles, 0, len(s))
for h := range s {
list = append(list, h)
}
sort.Sort(list)
return list
}
func (s CountedBlobSet) String() string {
str := s.List().String()
if len(str) < 2 {
return "{}"
}
return "{" + str[1:len(str)-1] + "}"
}
// Copy returns a copy of the CountedBlobSet.
func (s CountedBlobSet) Copy() CountedBlobSet {
cp := make(CountedBlobSet, len(s))
for k, v := range s {
cp[k] = v
}
return cp
}

45
internal/restic/counted_blob_set_test.go
View File

@ -1,45 +0,0 @@
package restic_test
import (
"testing"
"github.com/restic/restic/internal/restic"
"github.com/restic/restic/internal/test"
)
func TestCountedBlobSet(t *testing.T) {
bs := restic.NewCountedBlobSet()
test.Equals(t, bs.Len(), 0)
test.Equals(t, bs.List(), restic.BlobHandles{})
bh := restic.NewRandomBlobHandle()
// check non existent
test.Equals(t, bs.Has(bh), false)
// test insert
bs.Insert(bh)
test.Equals(t, bs.Has(bh), true)
test.Equals(t, bs.Len(), 1)
test.Equals(t, bs.List(), restic.BlobHandles{bh})
// test remove
bs.Delete(bh)
test.Equals(t, bs.Len(), 0)
test.Equals(t, bs.Has(bh), false)
test.Equals(t, bs.List(), restic.BlobHandles{})
bs = restic.NewCountedBlobSet(bh)
test.Equals(t, bs.Len(), 1)
test.Equals(t, bs.List(), restic.BlobHandles{bh})
s := bs.String()
test.Assert(t, len(s) > 10, "invalid string: %v", s)
}
func TestCountedBlobSetCopy(t *testing.T) {
bs := restic.NewCountedBlobSet(restic.NewRandomBlobHandle(), restic.NewRandomBlobHandle(), restic.NewRandomBlobHandle())
test.Equals(t, bs.Len(), 3)
cp := bs.Copy()
test.Equals(t, cp.Len(), 3)
test.Equals(t, bs.List(), cp.List())
}

4
internal/restic/find.go
View File

@ -15,14 +15,14 @@ type Loader interface {
Connections() uint
}
type findBlobSet interface {
type FindBlobSet interface {
Has(bh BlobHandle) bool
Insert(bh BlobHandle)
}
// FindUsedBlobs traverses the tree ID and adds all seen blobs (trees and data
// blobs) to the set blobs. Already seen tree blobs will not be visited again.
func FindUsedBlobs(ctx context.Context, repo Loader, treeIDs IDs, blobs findBlobSet, p *progress.Counter) error {
func FindUsedBlobs(ctx context.Context, repo Loader, treeIDs IDs, blobs FindBlobSet, p *progress.Counter) error {
var lock sync.Mutex
wg, ctx := errgroup.WithContext(ctx)