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lib/db: Add logging for GC (#7707)

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Simon Frei 2021-05-22 21:36:43 +02:00 committed by GitHub
parent 0126188ba7
commit 58592e3ef1
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 25 additions and 3 deletions
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28
lib/db/lowlevel.go
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@ -675,7 +675,7 @@ func (db *Lowlevel) timeUntil(key string, every time.Duration) time.Duration {
return sleepTime return sleepTime
} }
func (db *Lowlevel) gcIndirect(ctx context.Context) error { func (db *Lowlevel) gcIndirect(ctx context.Context) (err error) {
// The indirection GC uses bloom filters to track used block lists and // The indirection GC uses bloom filters to track used block lists and
// versions. This means iterating over all items, adding their hashes to // versions. This means iterating over all items, adding their hashes to
// the filter, then iterating over the indirected items and removing // the filter, then iterating over the indirected items and removing
@ -689,6 +689,26 @@ func (db *Lowlevel) gcIndirect(ctx context.Context) error {
db.gcMut.Lock() db.gcMut.Lock()
defer db.gcMut.Unlock() defer db.gcMut.Unlock()
l.Debugln("Started database GC")
var discardedBlocks, matchedBlocks, discardedVersions, matchedVersions int
internalCtx, cancel := context.WithCancel(ctx)
defer cancel()
go func() {
// Only print something if the process takes more than "a moment".
select {
case <-internalCtx.Done():
case <-time.After(10 * time.Second):
l.Infoln("Database GC started - many Syncthing operations will be unresponsive until it's finished")
<-internalCtx.Done()
if err != nil || ctx.Err() != nil {
return
}
l.Infof("Database GC done (discarded/remaining: %v/%v blocks, %v/%v versions)", discardedBlocks, matchedBlocks, discardedVersions, matchedVersions)
}
}()
t, err := db.newReadWriteTransaction() t, err := db.newReadWriteTransaction()
if err != nil { if err != nil {
return err return err
@ -746,7 +766,6 @@ func (db *Lowlevel) gcIndirect(ctx context.Context) error {
return err return err
} }
defer it.Release() defer it.Release()
matchedBlocks := 0
for it.Next() { for it.Next() {
select { select {
case <-ctx.Done(): case <-ctx.Done():
@ -762,6 +781,7 @@ func (db *Lowlevel) gcIndirect(ctx context.Context) error {
if err := t.Delete(key); err != nil { if err := t.Delete(key); err != nil {
return err return err
} }
discardedBlocks++
} }
it.Release() it.Release()
if err := it.Error(); err != nil { if err := it.Error(); err != nil {
@ -775,7 +795,6 @@ func (db *Lowlevel) gcIndirect(ctx context.Context) error {
if err != nil { if err != nil {
return err return err
} }
matchedVersions := 0
for it.Next() { for it.Next() {
select { select {
case <-ctx.Done(): case <-ctx.Done():
@ -791,6 +810,7 @@ func (db *Lowlevel) gcIndirect(ctx context.Context) error {
if err := t.Delete(key); err != nil { if err := t.Delete(key); err != nil {
return err return err
} }
discardedVersions++
} }
it.Release() it.Release()
if err := it.Error(); err != nil { if err := it.Error(); err != nil {
@ -807,6 +827,8 @@ func (db *Lowlevel) gcIndirect(ctx context.Context) error {
return err return err
} }
l.Debugf("Finished GC, starting compaction (discarded/remaining: %v/%v blocks, %v/%v versions)", discardedBlocks, matchedBlocks, discardedVersions, matchedVersions)
return db.Compact() return db.Compact()
} }