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meta_storage.go
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meta_storage.go
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package nsqd
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"math/rand"
"os"
"path"
"strconv"
"sync"
"sync/atomic"
"time"
"github.com/absolute8511/bolt"
"github.com/spaolacci/murmur3"
"github.com/youzan/nsq/internal/util"
)
const (
metaDataBucket = "meta_data_bucket"
)
var errMetaNotFound = errors.New("meta not found")
var alwaysEnableFileMetaWriter = int32(1)
func SwitchEnableFileMetaWriter(on bool) {
if on {
atomic.StoreInt32(&alwaysEnableFileMetaWriter, 1)
} else {
atomic.StoreInt32(&alwaysEnableFileMetaWriter, 0)
}
}
type IMetaStorage interface {
PersistReader(key string, fsync bool, confirmed diskQueueEndInfo, queueEndInfo diskQueueEndInfo) error
RetrieveReader(key string) (diskQueueEndInfo, diskQueueEndInfo, error)
Remove(key string)
PersistWriter(key string, fsync bool, wend diskQueueEndInfo) error
RetrieveWriter(key string, readOnly bool) (diskQueueEndInfo, error)
RemoveWriter(key string)
LoadChannelMeta(key string) ([]*ChannelMetaInfo, error)
SaveChannelMeta(key string, fsync bool, channels []*ChannelMetaInfo) error
RemoveChannelMeta(key string)
Sync()
Close()
}
func IsMetaNotFound(err error) bool {
if os.IsNotExist(err) {
return true
}
if err == errMetaNotFound {
return true
}
return false
}
type fileMetaStorage struct {
metaLock sync.Mutex
}
func checkMetaFileEnd(f *os.File) error {
endFlag := make([]byte, len(diskMagicEndBytes))
n, err := f.Read(endFlag)
if err != nil {
if err == io.EOF {
// old meta file
} else {
nsqLog.Errorf("reader meta end error, need fix: %v", err.Error())
return errInvalidMetaFileData
}
} else if !bytes.Equal(endFlag[:n], diskMagicEndBytes) {
nsqLog.Errorf("reader meta end data invalid: %v need fix: %v", n, endFlag)
return errInvalidMetaFileData
}
return nil
}
func (fs *fileMetaStorage) Sync() {
}
func (fs *fileMetaStorage) Close() {
}
// retrieveMetaData initializes state from the filesystem
func (fs *fileMetaStorage) RetrieveReader(fileName string) (diskQueueEndInfo, diskQueueEndInfo, error) {
var f *os.File
var err error
var confirmed diskQueueEndInfo
var queueEnd diskQueueEndInfo
f, err = os.OpenFile(fileName, os.O_RDONLY, 0644)
if err != nil {
return confirmed, queueEnd, err
}
defer f.Close()
_, err = fmt.Fscanf(f, "%d\n%d\n%d,%d,%d\n%d,%d,%d\n",
&confirmed.totalMsgCnt,
&queueEnd.totalMsgCnt,
&confirmed.EndOffset.FileNum, &confirmed.EndOffset.Pos, &confirmed.virtualEnd,
&queueEnd.EndOffset.FileNum, &queueEnd.EndOffset.Pos, &queueEnd.virtualEnd)
if err != nil {
nsqLog.Infof("fscanf new meta file err : %v", err)
return confirmed, queueEnd, err
}
err = checkMetaFileEnd(f)
if err != nil {
nsqLog.Errorf("reader (%v) meta invalid, need fix: %v", fileName, err.Error())
}
return confirmed, queueEnd, err
}
func preWriteMetaEnd(f *os.File) error {
// error can be ignored since we just make sure end with non-magic
f.Seek(-1*int64(len(diskMagicEndBytes)), os.SEEK_END)
_, err := f.Write(make([]byte, len(diskMagicEndBytes)))
if err != nil {
return err
}
_, err = f.Seek(0, os.SEEK_SET)
return err
}
func writeMeta(f *os.File, perr error, confirmed diskQueueEndInfo, queueEndInfo diskQueueEndInfo) (int, error) {
if perr != nil {
return 0, perr
}
n, err := fmt.Fprintf(f, "%d\n%d\n%d,%d,%d\n%d,%d,%d\n",
confirmed.TotalMsgCnt(),
queueEndInfo.totalMsgCnt,
confirmed.EndOffset.FileNum, confirmed.EndOffset.Pos, confirmed.Offset(),
queueEndInfo.EndOffset.FileNum, queueEndInfo.EndOffset.Pos, queueEndInfo.Offset())
return n, err
}
func writeMetaEnd(f *os.File, perr error, pos int) (int, error) {
if perr != nil {
return 0, perr
}
// write magic end
n, err := f.Write(diskMagicEndBytes)
pos += n
f.Truncate(int64(pos))
return n, err
}
func (fs *fileMetaStorage) Remove(fileName string) {
fs.metaLock.Lock()
defer fs.metaLock.Unlock()
os.Remove(fileName)
}
func (fs *fileMetaStorage) RemoveWriter(fileName string) {
fs.metaLock.Lock()
defer fs.metaLock.Unlock()
os.Remove(fileName)
}
// persistMetaData atomically writes state to the filesystem
func (fs *fileMetaStorage) PersistReader(fileName string, fsync bool, confirmed diskQueueEndInfo, queueEndInfo diskQueueEndInfo) error {
var f *os.File
var err error
var n int
pos := 0
s := time.Now()
fs.metaLock.Lock()
defer fs.metaLock.Unlock()
f, err = os.OpenFile(fileName, os.O_RDWR|os.O_CREATE, 0644)
if err != nil {
return err
}
cost1 := time.Since(s)
err = preWriteMetaEnd(f)
if testCrash {
return errors.New("test crash")
}
cost2 := time.Since(s)
n, err = writeMeta(f, err, confirmed, queueEndInfo)
pos += n
_, err = writeMetaEnd(f, err, pos)
if err != nil {
nsqLog.Errorf("reader (%v) meta write failed, need fix: %v", fileName, err.Error())
} else if fsync {
f.Sync()
}
f.Close()
cost3 := time.Since(s)
if cost3 >= slowCost {
nsqLog.Logf("reader (%v) meta persist cost: %v,%v,%v", fileName, cost1, cost2, cost3)
}
return err
}
func (fs *fileMetaStorage) RetrieveWriter(fileName string, readOnly bool) (diskQueueEndInfo, error) {
var qend diskQueueEndInfo
var f *os.File
var err error
f, err = os.OpenFile(fileName, os.O_RDONLY, 0644)
if err != nil {
return qend, err
}
defer f.Close()
var totalCnt int64
_, err = fmt.Fscanf(f, "%d\n%d,%d,%d\n",
&totalCnt,
&qend.EndOffset.FileNum, &qend.EndOffset.Pos, &qend.virtualEnd)
if err != nil {
return qend, err
}
atomic.StoreInt64(&qend.totalMsgCnt, totalCnt)
err = checkMetaFileEnd(f)
if err != nil && !readOnly {
// recovery from tmp meta file
tmpFileName := fmt.Sprintf("%s.tmp", fileName)
badFileName := fmt.Sprintf("%s.%d.corrupt", fileName, rand.Int())
nsqLog.Errorf("meta file corrupt to %v, try recover meta from file %v ", badFileName, tmpFileName)
err2 := util.AtomicRename(fileName, badFileName)
if err2 != nil {
nsqLog.Warningf("%v failed rename to %v : %v", fileName, badFileName, err2.Error())
} else {
err2 = util.AtomicRename(tmpFileName, fileName)
if err2 != nil {
nsqLog.Errorf("%v failed recover to %v : %v", tmpFileName, fileName, err2.Error())
util.AtomicRename(badFileName, fileName)
}
}
}
return qend, err
}
func (fs *fileMetaStorage) persistTmpMetaData(fileName string, writeEnd diskQueueEndInfo) error {
tmpFileName := fmt.Sprintf("%s.tmp", fileName)
f, err := os.OpenFile(tmpFileName, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0644)
if err != nil {
return err
}
_, err = fmt.Fprintf(f, "%d\n%d,%d,%d\n",
atomic.LoadInt64(&writeEnd.totalMsgCnt),
writeEnd.EndOffset.FileNum, writeEnd.EndOffset.Pos, writeEnd.Offset())
f.Close()
return err
}
func (fs *fileMetaStorage) PersistWriter(fileName string, fsync bool, writeEnd diskQueueEndInfo) error {
fs.metaLock.Lock()
defer fs.metaLock.Unlock()
var f *os.File
var err error
var n int
pos := 0
s := time.Now()
err = fs.persistTmpMetaData(fileName, writeEnd)
if err != nil {
return err
}
cost1 := time.Since(s)
f, err = os.OpenFile(fileName, os.O_RDWR|os.O_CREATE, 0644)
if err != nil {
return err
}
cost2 := time.Since(s)
err = preWriteMetaEnd(f)
cost3 := time.Since(s)
n, err = fmt.Fprintf(f, "%d\n%d,%d,%d\n",
writeEnd.totalMsgCnt,
writeEnd.EndOffset.FileNum, writeEnd.EndOffset.Pos, writeEnd.Offset())
pos += n
_, err = writeMetaEnd(f, err, pos)
if fsync && err == nil {
f.Sync()
}
f.Close()
cost4 := time.Since(s)
if cost4 >= slowCost {
nsqLog.Logf("writer (%v) meta persist cost: %v,%v,%v,%v", fileName, cost1, cost2, cost3, cost4)
}
return err
}
func (fs *fileMetaStorage) SaveChannelMeta(key string, fsync bool, channels []*ChannelMetaInfo) error {
d, err := json.Marshal(channels)
if err != nil {
return err
}
fs.metaLock.Lock()
defer fs.metaLock.Unlock()
tmpFileName := fmt.Sprintf("%s.%d.tmp", key, rand.Int())
f, err := os.OpenFile(tmpFileName, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
if err != nil {
return err
}
_, err = f.Write(d)
if err != nil {
f.Close()
return err
}
if fsync {
f.Sync()
}
f.Close()
return util.AtomicRename(tmpFileName, key)
}
func (fs *fileMetaStorage) LoadChannelMeta(key string) ([]*ChannelMetaInfo, error) {
data, err := ioutil.ReadFile(key)
if err != nil {
if !os.IsNotExist(err) {
nsqLog.LogErrorf("failed to read channel metadata from %s - %s", key, err)
}
return nil, err
}
channels := make([]*ChannelMetaInfo, 0)
err = json.Unmarshal(data, &channels)
if err != nil {
nsqLog.LogErrorf("failed to parse metadata - %s", err)
return nil, err
}
return channels, nil
}
func (fs *fileMetaStorage) RemoveChannelMeta(key string) {
fs.metaLock.Lock()
defer fs.metaLock.Unlock()
os.Remove(key)
}
type dbMetaData struct {
EndOffset diskQueueOffset
VirtualEnd BackendOffset
TotalMsgCnt int64
}
type dbMetaStorage struct {
dataPath string
db *bolt.DB
readOnly bool
fileMeta *fileMetaStorage
}
func NewDBMetaStorageForRead(p string) (*dbMetaStorage, error) {
return newDBMetaStorage(p, true)
}
func NewDBMetaStorage(p string) (*dbMetaStorage, error) {
return newDBMetaStorage(p, false)
}
func newDBMetaStorage(p string, readOnly bool) (*dbMetaStorage, error) {
ro := &bolt.Options{
Timeout: time.Second,
ReadOnly: readOnly,
FreelistType: bolt.FreelistMapType,
}
if !readOnly {
os.MkdirAll(p, 0755)
}
db, err := bolt.Open(path.Join(p, "meta.db"), 0644, ro)
if err != nil {
nsqLog.LogErrorf("failed to init bolt db meta storage: %v , %v ", p, err)
return nil, err
}
db.NoSync = true
if !readOnly {
err = db.Update(func(tx *bolt.Tx) error {
_, errC := tx.CreateBucketIfNotExists([]byte(metaDataBucket))
return errC
})
if err != nil {
nsqLog.LogErrorf("failed to init bucket: %v , %v ", p, err)
return nil, err
}
}
return &dbMetaStorage{
db: db,
dataPath: p,
fileMeta: &fileMetaStorage{},
readOnly: readOnly,
}, nil
}
func (dbs *dbMetaStorage) PersistReader(key string, fsync bool, confirmed diskQueueEndInfo, queueEndInfo diskQueueEndInfo) error {
var metaConfirmed dbMetaData
metaConfirmed.EndOffset = confirmed.EndOffset
metaConfirmed.VirtualEnd = confirmed.virtualEnd
metaConfirmed.TotalMsgCnt = confirmed.totalMsgCnt
var metaQueueEnd dbMetaData
metaQueueEnd.EndOffset = queueEndInfo.EndOffset
metaQueueEnd.TotalMsgCnt = queueEndInfo.totalMsgCnt
metaQueueEnd.VirtualEnd = queueEndInfo.virtualEnd
err := dbs.db.Update(func(tx *bolt.Tx) error {
b := tx.Bucket([]byte(metaDataBucket))
newV, _ := json.Marshal(metaConfirmed)
ck := []byte(key + "-confirmed")
oldV := b.Get(ck)
exists := oldV != nil
if exists && bytes.Equal(oldV, newV) {
} else {
err := b.Put(ck, newV)
if err != nil {
return err
}
}
ek := []byte(key + "-end")
newV, _ = json.Marshal(metaQueueEnd)
oldV = b.Get(ek)
exists = oldV != nil
if exists && bytes.Equal(oldV, newV) {
} else {
err := b.Put(ek, newV)
if err != nil {
return err
}
}
return nil
})
if fsync && err == nil {
dbs.Sync()
}
if err != nil {
nsqLog.LogErrorf("failed to save meta key %v from db: %v , %v ", key, dbs.dataPath, err)
}
return err
}
func (dbs *dbMetaStorage) Remove(key string) {
dbs.db.Update(func(tx *bolt.Tx) error {
b := tx.Bucket([]byte(metaDataBucket))
ck := []byte(key + "-confirmed")
b.Delete(ck)
ek := []byte(key + "-end")
b.Delete(ek)
return nil
})
dbs.fileMeta.Remove(key)
}
func (dbs *dbMetaStorage) RetrieveReader(key string) (diskQueueEndInfo, diskQueueEndInfo, error) {
var confirmed diskQueueEndInfo
var queueEnd diskQueueEndInfo
var metaConfirmed dbMetaData
var metaEnd dbMetaData
fallback := false
err := dbs.db.View(func(tx *bolt.Tx) error {
b := tx.Bucket([]byte(metaDataBucket))
ck := []byte(key + "-confirmed")
ek := []byte(key + "-end")
v := b.Get(ck)
v2 := b.Get(ek)
if v == nil && v2 == nil {
fallback = true
return errMetaNotFound
}
err := json.Unmarshal(v, &metaConfirmed)
if err != nil {
return err
}
err = json.Unmarshal(v2, &metaEnd)
if err != nil {
return err
}
return nil
})
if err != nil {
nsqLog.Infof("failed to read meta key %v from db: %v , %v ", key, dbs.dataPath, err)
}
if fallback || err != nil {
nsqLog.Logf("fallback to read meta key %v from file meta", key)
return dbs.fileMeta.RetrieveReader(key)
}
confirmed.EndOffset = metaConfirmed.EndOffset
confirmed.totalMsgCnt = metaConfirmed.TotalMsgCnt
confirmed.virtualEnd = metaConfirmed.VirtualEnd
queueEnd.EndOffset = metaEnd.EndOffset
queueEnd.totalMsgCnt = metaEnd.TotalMsgCnt
queueEnd.virtualEnd = metaEnd.VirtualEnd
return confirmed, queueEnd, err
}
func (dbs *dbMetaStorage) RemoveWriter(key string) {
dbs.db.Update(func(tx *bolt.Tx) error {
b := tx.Bucket([]byte(metaDataBucket))
ek := []byte(key + "-writer")
b.Delete(ek)
return nil
})
dbs.fileMeta.RemoveWriter(key)
}
func (dbs *dbMetaStorage) PersistWriter(key string, fsync bool, queueEndInfo diskQueueEndInfo) error {
var metaQueueEnd dbMetaData
metaQueueEnd.EndOffset = queueEndInfo.EndOffset
metaQueueEnd.TotalMsgCnt = queueEndInfo.totalMsgCnt
metaQueueEnd.VirtualEnd = queueEndInfo.virtualEnd
err := dbs.db.Update(func(tx *bolt.Tx) error {
b := tx.Bucket([]byte(metaDataBucket))
ek := []byte(key + "-writer")
newV, _ := json.Marshal(metaQueueEnd)
oldV := b.Get(ek)
exists := oldV != nil
if exists && bytes.Equal(oldV, newV) {
} else {
err := b.Put(ek, newV)
if err != nil {
return err
}
}
return nil
})
if fsync && err == nil {
dbs.Sync()
}
if err != nil {
nsqLog.LogErrorf("failed to save meta key %v from db: %v , %v ", key, dbs.dataPath, err)
}
if atomic.LoadInt32(&alwaysEnableFileMetaWriter) == 1 {
dbs.fileMeta.PersistWriter(key, fsync, queueEndInfo)
}
return err
}
func (dbs *dbMetaStorage) RetrieveWriter(key string, readOnly bool) (diskQueueEndInfo, error) {
var queueEnd diskQueueEndInfo
var metaEnd dbMetaData
fallback := false
err := dbs.db.View(func(tx *bolt.Tx) error {
b := tx.Bucket([]byte(metaDataBucket))
ek := []byte(key + "-writer")
v := b.Get(ek)
if v == nil {
fallback = true
return errMetaNotFound
}
return json.Unmarshal(v, &metaEnd)
})
if err != nil {
nsqLog.Infof("failed to read meta key %v from db: %v , %v ", key, dbs.dataPath, err)
}
if fallback || err != nil {
nsqLog.Logf("fallback to read meta key %v from file meta", key)
return dbs.fileMeta.RetrieveWriter(key, readOnly)
}
queueEnd.EndOffset = metaEnd.EndOffset
queueEnd.totalMsgCnt = metaEnd.TotalMsgCnt
queueEnd.virtualEnd = metaEnd.VirtualEnd
return queueEnd, err
}
func (dbs *dbMetaStorage) SaveChannelMeta(key string, fsync bool, channels []*ChannelMetaInfo) error {
err := dbs.db.Update(func(tx *bolt.Tx) error {
b := tx.Bucket([]byte(metaDataBucket))
ek := []byte(key + "-channelmeta")
newV, _ := json.Marshal(channels)
oldV := b.Get(ek)
exists := oldV != nil
if exists && bytes.Equal(oldV, newV) {
} else {
err := b.Put(ek, newV)
if err != nil {
return err
}
}
return nil
})
if fsync && err == nil {
dbs.Sync()
}
if err != nil {
nsqLog.LogErrorf("failed to save meta key %v to db: %v , %v ", key, dbs.dataPath, err)
}
if atomic.LoadInt32(&alwaysEnableFileMetaWriter) == 1 {
dbs.fileMeta.SaveChannelMeta(key, fsync, channels)
}
return err
}
func (dbs *dbMetaStorage) LoadChannelMeta(key string) ([]*ChannelMetaInfo, error) {
fallback := false
var meta []*ChannelMetaInfo
err := dbs.db.View(func(tx *bolt.Tx) error {
b := tx.Bucket([]byte(metaDataBucket))
ek := []byte(key + "-channelmeta")
v := b.Get(ek)
if v == nil {
fallback = true
return errMetaNotFound
}
return json.Unmarshal(v, &meta)
})
if err != nil {
nsqLog.Infof("failed to read meta key %v from db: %v , %v ", key, dbs.dataPath, err)
}
if fallback || err != nil {
nsqLog.Logf("fallback to read meta key %v from file meta", key)
return dbs.fileMeta.LoadChannelMeta(key)
}
return meta, err
}
func (dbs *dbMetaStorage) RemoveChannelMeta(key string) {
dbs.db.Update(func(tx *bolt.Tx) error {
b := tx.Bucket([]byte(metaDataBucket))
ek := []byte(key + "-channelmeta")
b.Delete(ek)
return nil
})
dbs.fileMeta.RemoveChannelMeta(key)
}
func (dbs *dbMetaStorage) Sync() {
if dbs.readOnly {
return
}
if dbs.db != nil {
dbs.db.Sync()
}
dbs.fileMeta.Sync()
}
func (dbs *dbMetaStorage) Close() {
if dbs.db != nil {
if !dbs.readOnly {
dbs.db.Sync()
}
dbs.db.Close()
}
dbs.fileMeta.Close()
}
type shardedDBMetaStorage struct {
dataPath string
dbShards [8]*dbMetaStorage
writedbShards [32]*dbMetaStorage
}
func NewShardedDBMetaStorageForRead(p string) (*shardedDBMetaStorage, error) {
d := &shardedDBMetaStorage{
dataPath: p,
}
var err error
for i := 0; i < len(d.dbShards); i++ {
d.dbShards[i], err = NewDBMetaStorageForRead(path.Join(p, strconv.Itoa(i)))
if err != nil {
return nil, err
}
}
for i := 0; i < len(d.writedbShards); i++ {
d.writedbShards[i], err = NewDBMetaStorageForRead(path.Join(p, "writer", strconv.Itoa(i)))
if err != nil {
return nil, err
}
}
return d, nil
}
func NewShardedDBMetaStorage(p string) (*shardedDBMetaStorage, error) {
d := &shardedDBMetaStorage{
dataPath: p,
}
var err error
for i := 0; i < len(d.dbShards); i++ {
d.dbShards[i], err = NewDBMetaStorage(path.Join(p, strconv.Itoa(i)))
if err != nil {
return nil, err
}
}
for i := 0; i < len(d.writedbShards); i++ {
d.writedbShards[i], err = NewDBMetaStorage(path.Join(p, "writer", strconv.Itoa(i)))
if err != nil {
return nil, err
}
}
return d, nil
}
func (ss *shardedDBMetaStorage) RetrieveReader(key string) (diskQueueEndInfo, diskQueueEndInfo, error) {
h := int(murmur3.Sum32([]byte(key))) % len(ss.dbShards)
d := ss.dbShards[h]
return d.RetrieveReader(key)
}
func (ss *shardedDBMetaStorage) Remove(key string) {
h := int(murmur3.Sum32([]byte(key))) % len(ss.dbShards)
d := ss.dbShards[h]
d.Remove(key)
}
func (ss *shardedDBMetaStorage) RemoveWriter(key string) {
h := int(murmur3.Sum32([]byte(key))) % len(ss.writedbShards)
d := ss.writedbShards[h]
d.RemoveWriter(key)
}
func (ss *shardedDBMetaStorage) PersistReader(key string, fsync bool, confirmed diskQueueEndInfo, queueEndInfo diskQueueEndInfo) error {
h := int(murmur3.Sum32([]byte(key))) % len(ss.dbShards)
d := ss.dbShards[h]
return d.PersistReader(key, fsync, confirmed, queueEndInfo)
}
func (ss *shardedDBMetaStorage) PersistWriter(key string, fsync bool, queueEndInfo diskQueueEndInfo) error {
h := int(murmur3.Sum32([]byte(key))) % len(ss.writedbShards)
d := ss.writedbShards[h]
return d.PersistWriter(key, fsync, queueEndInfo)
}
func (ss *shardedDBMetaStorage) RetrieveWriter(key string, readOnly bool) (diskQueueEndInfo, error) {
h := int(murmur3.Sum32([]byte(key))) % len(ss.writedbShards)
d := ss.writedbShards[h]
return d.RetrieveWriter(key, readOnly)
}
func (ss *shardedDBMetaStorage) SaveChannelMeta(key string, fsync bool, channels []*ChannelMetaInfo) error {
h := int(murmur3.Sum32([]byte(key))) % len(ss.dbShards)
d := ss.dbShards[h]
return d.SaveChannelMeta(key, fsync, channels)
}
func (ss *shardedDBMetaStorage) LoadChannelMeta(key string) ([]*ChannelMetaInfo, error) {
h := int(murmur3.Sum32([]byte(key))) % len(ss.dbShards)
d := ss.dbShards[h]
return d.LoadChannelMeta(key)
}
func (ss *shardedDBMetaStorage) RemoveChannelMeta(key string) {
h := int(murmur3.Sum32([]byte(key))) % len(ss.dbShards)
d := ss.dbShards[h]
d.RemoveChannelMeta(key)
}
func (ss *shardedDBMetaStorage) Sync() {
for _, d := range ss.dbShards {
d.Sync()
}
for _, d := range ss.writedbShards {
d.Sync()
}
}
func (ss *shardedDBMetaStorage) Close() {
ss.Sync()
for _, d := range ss.dbShards {
d.Close()
}
for _, d := range ss.writedbShards {
d.Close()
}
}