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package storage
import (
"fmt"
"os"
"path/filepath"
"github.com/syndtr/goleveldb/leveldb/errors"
"github.com/syndtr/goleveldb/leveldb/opt"
"github.com/seaweedfs/seaweedfs/weed/storage/idx"
"github.com/seaweedfs/seaweedfs/weed/storage/types"
"github.com/seaweedfs/seaweedfs/weed/util"
"github.com/syndtr/goleveldb/leveldb"
"github.com/seaweedfs/seaweedfs/weed/glog"
"github.com/seaweedfs/seaweedfs/weed/storage/needle_map"
. "github.com/seaweedfs/seaweedfs/weed/storage/types"
)
//mark it every watermarkBatchSize operations
const watermarkBatchSize = 10000
var watermarkKey = []byte("idx_entry_watermark")
type LevelDbNeedleMap struct {
baseNeedleMapper
dbFileName string
db *leveldb.DB
recordCount uint64
}
func NewLevelDbNeedleMap(dbFileName string, indexFile *os.File, opts *opt.Options) (m *LevelDbNeedleMap, err error) {
m = &LevelDbNeedleMap{dbFileName: dbFileName}
m.indexFile = indexFile
if !isLevelDbFresh(dbFileName, indexFile) {
glog.V(1).Infof("Start to Generate %s from %s", dbFileName, indexFile.Name())
generateLevelDbFile(dbFileName, indexFile)
glog.V(1).Infof("Finished Generating %s from %s", dbFileName, indexFile.Name())
}
if stat, err := indexFile.Stat(); err != nil {
glog.Fatalf("stat file %s: %v", indexFile.Name(), err)
} else {
m.indexFileOffset = stat.Size()
}
glog.V(1).Infof("Opening %s...", dbFileName)
if m.db, err = leveldb.OpenFile(dbFileName, opts); err != nil {
if errors.IsCorrupted(err) {
m.db, err = leveldb.RecoverFile(dbFileName, opts)
}
if err != nil {
return
}
}
glog.V(0).Infof("Loading %s... , watermark: %d", dbFileName, getWatermark(m.db))
m.recordCount = uint64(m.indexFileOffset / types.NeedleMapEntrySize)
watermark := (m.recordCount / watermarkBatchSize) * watermarkBatchSize
err = setWatermark(m.db, watermark)
if err != nil {
glog.Fatalf("set watermark for %s error: %s\n", dbFileName, err)
return
}
mm, indexLoadError := newNeedleMapMetricFromIndexFile(indexFile)
if indexLoadError != nil {
return nil, indexLoadError
}
m.mapMetric = *mm
return
}
func isLevelDbFresh(dbFileName string, indexFile *os.File) bool {
// normally we always write to index file first
dbLogFile, err := os.Open(filepath.Join(dbFileName, "LOG"))
if err != nil {
return false
}
defer dbLogFile.Close()
dbStat, dbStatErr := dbLogFile.Stat()
indexStat, indexStatErr := indexFile.Stat()
if dbStatErr != nil || indexStatErr != nil {
glog.V(0).Infof("Can not stat file: %v and %v", dbStatErr, indexStatErr)
return false
}
return dbStat.ModTime().After(indexStat.ModTime())
}
func generateLevelDbFile(dbFileName string, indexFile *os.File) error {
db, err := leveldb.OpenFile(dbFileName, nil)
if err != nil {
return err
}
defer db.Close()
watermark := getWatermark(db)
if stat, err := indexFile.Stat(); err != nil {
glog.Fatalf("stat file %s: %v", indexFile.Name(), err)
return err
} else {
if watermark*types.NeedleMapEntrySize > uint64(stat.Size()) {
glog.Warningf("wrong watermark %d for filesize %d", watermark, stat.Size())
}
glog.V(0).Infof("generateLevelDbFile %s, watermark %d, num of entries:%d", dbFileName, watermark, (uint64(stat.Size())-watermark*types.NeedleMapEntrySize)/types.NeedleMapEntrySize)
}
return idx.WalkIndexFile(indexFile, watermark, func(key NeedleId, offset Offset, size Size) error {
if !offset.IsZero() && size.IsValid() {
levelDbWrite(db, key, offset, size, false, 0)
} else {
levelDbDelete(db, key)
}
return nil
})
}
func (m *LevelDbNeedleMap) Get(key NeedleId) (element *needle_map.NeedleValue, ok bool) {
bytes := make([]byte, NeedleIdSize)
NeedleIdToBytes(bytes[0:NeedleIdSize], key)
data, err := m.db.Get(bytes, nil)
if err != nil || len(data) != OffsetSize+SizeSize {
return nil, false
}
offset := BytesToOffset(data[0:OffsetSize])
size := BytesToSize(data[OffsetSize : OffsetSize+SizeSize])
return &needle_map.NeedleValue{Key: key, Offset: offset, Size: size}, true
}
func (m *LevelDbNeedleMap) Put(key NeedleId, offset Offset, size Size) error {
var oldSize Size
var watermark uint64
if oldNeedle, ok := m.Get(key); ok {
oldSize = oldNeedle.Size
}
m.logPut(key, oldSize, size)
// write to index file first
if err := m.appendToIndexFile(key, offset, size); err != nil {
return fmt.Errorf("cannot write to indexfile %s: %v", m.indexFile.Name(), err)
}
m.recordCount++
if m.recordCount%watermarkBatchSize != 0 {
watermark = 0
} else {
watermark = (m.recordCount / watermarkBatchSize) * watermarkBatchSize
glog.V(1).Infof("put cnt:%d for %s,watermark: %d", m.recordCount, m.dbFileName, watermark)
}
return levelDbWrite(m.db, key, offset, size, watermark == 0, watermark)
}
func getWatermark(db *leveldb.DB) uint64 {
data, err := db.Get(watermarkKey, nil)
if err != nil || len(data) != 8 {
glog.Warningf("get watermark from db error: %v, %d", err, len(data))
/*
if !strings.Contains(strings.ToLower(err.Error()), "not found") {
err = setWatermark(db, 0)
if err != nil {
glog.Errorf("failed to set watermark: %v", err)
}
}
*/
return 0
}
return util.BytesToUint64(data)
}
func setWatermark(db *leveldb.DB, watermark uint64) error {
glog.V(1).Infof("set watermark %d", watermark)
var wmBytes = make([]byte, 8)
util.Uint64toBytes(wmBytes, watermark)
if err := db.Put(watermarkKey, wmBytes, nil); err != nil {
return fmt.Errorf("failed to setWatermark: %v", err)
}
return nil
}
func levelDbWrite(db *leveldb.DB, key NeedleId, offset Offset, size Size, updateWatermark bool, watermark uint64) error {
bytes := needle_map.ToBytes(key, offset, size)
if err := db.Put(bytes[0:NeedleIdSize], bytes[NeedleIdSize:NeedleIdSize+OffsetSize+SizeSize], nil); err != nil {
return fmt.Errorf("failed to write leveldb: %v", err)
}
// set watermark
if updateWatermark {
return setWatermark(db, watermark)
}
return nil
}
func levelDbDelete(db *leveldb.DB, key NeedleId) error {
bytes := make([]byte, NeedleIdSize)
NeedleIdToBytes(bytes, key)
return db.Delete(bytes, nil)
}
func (m *LevelDbNeedleMap) Delete(key NeedleId, offset Offset) error {
var watermark uint64
oldNeedle, found := m.Get(key)
if !found || oldNeedle.Size.IsDeleted() {
return nil
}
m.logDelete(oldNeedle.Size)
// write to index file first
if err := m.appendToIndexFile(key, offset, TombstoneFileSize); err != nil {
return err
}
m.recordCount++
if m.recordCount%watermarkBatchSize != 0 {
watermark = 0
} else {
watermark = (m.recordCount / watermarkBatchSize) * watermarkBatchSize
}
return levelDbWrite(m.db, key, oldNeedle.Offset, -oldNeedle.Size, watermark == 0, watermark)
}
func (m *LevelDbNeedleMap) Close() {
indexFileName := m.indexFile.Name()
if err := m.indexFile.Sync(); err != nil {
glog.Warningf("sync file %s failed: %v", indexFileName, err)
}
if err := m.indexFile.Close(); err != nil {
glog.Warningf("close index file %s failed: %v", indexFileName, err)
}
if m.db != nil {
if err := m.db.Close(); err != nil {
glog.Warningf("close levelDB failed: %v", err)
}
}
}
func (m *LevelDbNeedleMap) Destroy() error {
m.Close()
os.Remove(m.indexFile.Name())
return os.RemoveAll(m.dbFileName)
}
|
