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backupds: Compact log on restart

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This commit is contained in:
Łukasz Magiera 2021-03-24 21:16:42 +01:00
parent c41777dcd2
commit bb79eba74c
2 changed files with 47 additions and 20 deletions
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57
lib/backupds/log.go
View File

@ -55,7 +55,7 @@ func (d *Datastore) startLog(logdir string) error {
return xerrors.Errorf("creating log: %w", err)
}
} else {
l, err = d.openLog(filepath.Join(logdir, latest))
l, latest, err = d.openLog(filepath.Join(logdir, latest))
if err != nil {
return xerrors.Errorf("opening log: %w", err)
}
@ -97,6 +97,8 @@ type logfile struct {
file *os.File
}
var compactThresh = 2
func (d *Datastore) createLog(logdir string) (*logfile, string, error) {
p := filepath.Join(logdir, strconv.FormatInt(time.Now().Unix(), 10)+".log.cbor")
log.Infow("creating log", "file", p)
@ -119,32 +121,36 @@ func (d *Datastore) createLog(logdir string) (*logfile, string, error) {
}, filepath.Base(p), nil
}
func (d *Datastore) openLog(p string) (*logfile, error) {
func (d *Datastore) openLog(p string) (*logfile, string, error) {
log.Infow("opening log", "file", p)
lh, err := d.child.Get(loghead)
if err != nil {
return nil, xerrors.Errorf("checking log head (logfile '%s'): %w", p, err)
return nil, "", xerrors.Errorf("checking log head (logfile '%s'): %w", p, err)
}
lhp := strings.Split(string(lh), ";")
if len(lhp) != 3 {
return nil, xerrors.Errorf("expected loghead to have 3 parts")
return nil, "", xerrors.Errorf("expected loghead to have 3 parts")
}
if lhp[0] != filepath.Base(p) {
return nil, xerrors.Errorf("loghead log file doesn't match, opening %s, expected %s", p, lhp[0])
return nil, "", xerrors.Errorf("loghead log file doesn't match, opening %s, expected %s", p, lhp[0])
}
f, err := os.OpenFile(p, os.O_RDWR, 0644)
if err != nil {
return nil, err
return nil, "", err
}
var lastLogHead string
var openCount, logvals int64
var openCount, vals, logvals int64
// check file integrity
err = ReadBackup(f, func(k datastore.Key, v []byte) error {
err = ReadBackup(f, func(k datastore.Key, v []byte, log bool) error {
if log {
logvals++
} else {
vals++
}
if k == loghead {
lastLogHead = string(v)
openCount++
@ -152,32 +158,53 @@ func (d *Datastore) openLog(p string) (*logfile, error) {
return nil
})
if err != nil {
return nil, xerrors.Errorf("reading backup part of the logfile: %w", err)
return nil, "", xerrors.Errorf("reading backup part of the logfile: %w", err)
}
if string(lh) != lastLogHead {
return nil, xerrors.Errorf("loghead didn't match, expected '%s', last in logfile '%s'", string(lh), lastLogHead)
return nil, "", xerrors.Errorf("loghead didn't match, expected '%s', last in logfile '%s'", string(lh), lastLogHead)
}
// make sure we're at the end of the file
at, err := f.Seek(0, io.SeekCurrent)
if err != nil {
return nil, xerrors.Errorf("get current logfile offset: %w", err)
return nil, "", xerrors.Errorf("get current logfile offset: %w", err)
}
end, err := f.Seek(0, io.SeekEnd)
if err != nil {
return nil, xerrors.Errorf("get current logfile offset: %w", err)
return nil, "", xerrors.Errorf("get current logfile offset: %w", err)
}
if at != end {
return nil, xerrors.Errorf("logfile %s validated %d bytes, but the file has %d bytes (%d more)", p, at, end, end-at)
return nil, "", xerrors.Errorf("logfile %s validated %d bytes, but the file has %d bytes (%d more)", p, at, end, end-at)
}
log.Infow("log opened", "file", p, "openCount", openCount, "logValues", logvals)
compact := logvals > vals * int64(compactThresh)
if compact {
log.Infow("compacting log", "current", p, "openCount", openCount, "baseValues", vals, "logValues", logvals)
if err := f.Close(); err != nil {
return nil, "", xerrors.Errorf("closing current log: %w", err)
}
l, latest, err := d.createLog(filepath.Dir(p))
if err != nil {
return nil, "", xerrors.Errorf("creating compacted log: %w", err)
}
log.Infow("compacted log created, cleaning up old", "old", p, "new", latest)
if err := os.Remove(p); err != nil {
l.Close() // nolint
return nil, "", xerrors.Errorf("cleaning up old logfile: %w", err)
}
return l, latest, nil
}
log.Infow("log opened", "file", p, "openCount", openCount, "baseValues", vals, "logValues", logvals)
// todo: maybe write a magic 'opened at' entry; pad the log to filesystem page to prevent more exotic types of corruption
return &logfile{
file: f,
}, nil
}, filepath.Base(p), nil
}
func (l *logfile) writeLogHead(logname string, ds datastore.Batching) error {

8
lib/backupds/read.go
View File

@ -11,7 +11,7 @@ import (
"golang.org/x/xerrors"
)
func ReadBackup(r io.Reader, cb func(key datastore.Key, value []byte) error) error {
func ReadBackup(r io.Reader, cb func(key datastore.Key, value []byte, log bool) error) error {
scratch := make([]byte, 9)
// read array[2](
@ -61,7 +61,7 @@ func ReadBackup(r io.Reader, cb func(key datastore.Key, value []byte) error) err
return xerrors.Errorf("reading value: %w", err)
}
if err := cb(key, value); err != nil {
if err := cb(key, value, false); err != nil {
return err
}
}
@ -110,7 +110,7 @@ func ReadBackup(r io.Reader, cb func(key datastore.Key, value []byte) error) err
key := datastore.NewKey(string(ent.Key))
if err := cb(key, ent.Value); err != nil {
if err := cb(key, ent.Value, true); err != nil {
return err
}
}
@ -122,7 +122,7 @@ func RestoreInto(r io.Reader, dest datastore.Batching) error {
return xerrors.Errorf("creating batch: %w", err)
}
err = ReadBackup(r, func(key datastore.Key, value []byte) error {
err = ReadBackup(r, func(key datastore.Key, value []byte, _ bool) error {
if err := batch.Put(key, value); err != nil {
return xerrors.Errorf("put key: %w", err)
}