seaweedfs/weed/storage/disk_location.go

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package storage
import (
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"fmt"
"io/ioutil"
"os"
"path/filepath"
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"strings"
"sync"
"time"
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"github.com/chrislusf/seaweedfs/weed/glog"
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"github.com/chrislusf/seaweedfs/weed/stats"
"github.com/chrislusf/seaweedfs/weed/storage/erasure_coding"
"github.com/chrislusf/seaweedfs/weed/storage/needle"
"github.com/chrislusf/seaweedfs/weed/util"
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)
type DiskLocation struct {
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Directory string
MaxVolumeCount int
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MinFreeSpacePercent float32
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volumes map[needle.VolumeId]*Volume
volumesLock sync.RWMutex
// erasure coding
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ecVolumes map[needle.VolumeId]*erasure_coding.EcVolume
ecVolumesLock sync.RWMutex
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isDiskSpaceLow bool
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}
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func NewDiskLocation(dir string, maxVolumeCount int, minFreeSpacePercent float32) *DiskLocation {
location := &DiskLocation{Directory: dir, MaxVolumeCount: maxVolumeCount, MinFreeSpacePercent: minFreeSpacePercent}
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location.volumes = make(map[needle.VolumeId]*Volume)
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location.ecVolumes = make(map[needle.VolumeId]*erasure_coding.EcVolume)
go location.CheckDiskSpace()
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return location
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}
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func (l *DiskLocation) volumeIdFromPath(dir os.FileInfo) (needle.VolumeId, string, error) {
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name := dir.Name()
if !dir.IsDir() && strings.HasSuffix(name, ".idx") {
base := name[:len(name)-len(".idx")]
collection, volumeId, err := parseCollectionVolumeId(base)
return volumeId, collection, err
}
return 0, "", fmt.Errorf("Path is not a volume: %s", name)
}
func parseCollectionVolumeId(base string) (collection string, vid needle.VolumeId, err error) {
i := strings.LastIndex(base, "_")
if i > 0 {
collection, base = base[0:i], base[i+1:]
}
vol, err := needle.NewVolumeId(base)
return collection, vol, err
}
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func (l *DiskLocation) loadExistingVolume(fileInfo os.FileInfo, needleMapKind NeedleMapType) bool {
name := fileInfo.Name()
if !fileInfo.IsDir() && strings.HasSuffix(name, ".idx") {
noteFile := l.Directory + "/" + name + ".note"
if util.FileExists(noteFile) {
note, _ := ioutil.ReadFile(noteFile)
glog.Warningf("volume %s was not completed: %s", name, string(note))
removeVolumeFiles(l.Directory + "/" + name)
return false
}
vid, collection, err := l.volumeIdFromPath(fileInfo)
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if err != nil {
glog.Warningf("get volume id failed, %s, err : %s", name, err)
return false
}
// void loading one volume more than once
l.volumesLock.RLock()
_, found := l.volumes[vid]
l.volumesLock.RUnlock()
if found {
glog.V(1).Infof("loaded volume, %v", vid)
return true
}
v, e := NewVolume(l.Directory, collection, vid, needleMapKind, nil, nil, 0, 0)
if e != nil {
glog.V(0).Infof("new volume %s error %s", name, e)
return false
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}
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l.SetVolume(vid, v)
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size, _, _ := v.FileStat()
glog.V(0).Infof("data file %s, replicaPlacement=%s v=%d size=%d ttl=%s",
l.Directory+"/"+name, v.ReplicaPlacement, v.Version(), size, v.Ttl.String())
return true
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}
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return false
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}
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func (l *DiskLocation) concurrentLoadingVolumes(needleMapKind NeedleMapType, concurrency int) {
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task_queue := make(chan os.FileInfo, 10*concurrency)
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go func() {
if dirs, err := ioutil.ReadDir(l.Directory); err == nil {
for _, dir := range dirs {
task_queue <- dir
}
}
close(task_queue)
}()
var wg sync.WaitGroup
for workerNum := 0; workerNum < concurrency; workerNum++ {
wg.Add(1)
go func() {
defer wg.Done()
for dir := range task_queue {
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_ = l.loadExistingVolume(dir, needleMapKind)
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}
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}()
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}
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wg.Wait()
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}
func (l *DiskLocation) loadExistingVolumes(needleMapKind NeedleMapType) {
l.concurrentLoadingVolumes(needleMapKind, 10)
glog.V(0).Infof("Store started on dir: %s with %d volumes max %d", l.Directory, len(l.volumes), l.MaxVolumeCount)
l.loadAllEcShards()
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glog.V(0).Infof("Store started on dir: %s with %d ec shards", l.Directory, len(l.ecVolumes))
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}
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func (l *DiskLocation) DeleteCollectionFromDiskLocation(collection string) (e error) {
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l.volumesLock.Lock()
delVolsMap := l.unmountVolumeByCollection(collection)
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l.volumesLock.Unlock()
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l.ecVolumesLock.Lock()
delEcVolsMap := l.unmountEcVolumeByCollection(collection)
l.ecVolumesLock.Unlock()
errChain := make(chan error, 2)
var wg sync.WaitGroup
wg.Add(2)
go func() {
for _, v := range delVolsMap {
if err := v.Destroy(); err != nil {
errChain <- err
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}
}
wg.Done()
}()
go func() {
for _, v := range delEcVolsMap {
v.Destroy()
}
wg.Done()
}()
go func() {
wg.Wait()
close(errChain)
}()
errBuilder := strings.Builder{}
for err := range errChain {
errBuilder.WriteString(err.Error())
errBuilder.WriteString("; ")
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}
if errBuilder.Len() > 0 {
e = fmt.Errorf(errBuilder.String())
}
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return
}
func (l *DiskLocation) deleteVolumeById(vid needle.VolumeId) (found bool, e error) {
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v, ok := l.volumes[vid]
if !ok {
return
}
e = v.Destroy()
if e != nil {
return
}
found = true
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delete(l.volumes, vid)
return
}
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func (l *DiskLocation) LoadVolume(vid needle.VolumeId, needleMapKind NeedleMapType) bool {
if fileInfo, found := l.LocateVolume(vid); found {
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return l.loadExistingVolume(fileInfo, needleMapKind)
}
return false
}
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func (l *DiskLocation) DeleteVolume(vid needle.VolumeId) error {
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l.volumesLock.Lock()
defer l.volumesLock.Unlock()
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_, ok := l.volumes[vid]
if !ok {
return fmt.Errorf("Volume not found, VolumeId: %d", vid)
}
_, err := l.deleteVolumeById(vid)
return err
}
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func (l *DiskLocation) UnloadVolume(vid needle.VolumeId) error {
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l.volumesLock.Lock()
defer l.volumesLock.Unlock()
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v, ok := l.volumes[vid]
if !ok {
return fmt.Errorf("Volume not loaded, VolumeId: %d", vid)
}
v.Close()
delete(l.volumes, vid)
return nil
}
func (l *DiskLocation) unmountVolumeByCollection(collectionName string) map[needle.VolumeId]*Volume {
deltaVols := make(map[needle.VolumeId]*Volume, 0)
for k, v := range l.volumes {
if v.Collection == collectionName && !v.isCompacting {
deltaVols[k] = v
}
}
for k := range deltaVols {
delete(l.volumes, k)
}
return deltaVols
}
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func (l *DiskLocation) SetVolume(vid needle.VolumeId, volume *Volume) {
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l.volumesLock.Lock()
defer l.volumesLock.Unlock()
l.volumes[vid] = volume
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volume.location = l
}
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func (l *DiskLocation) FindVolume(vid needle.VolumeId) (*Volume, bool) {
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l.volumesLock.RLock()
defer l.volumesLock.RUnlock()
v, ok := l.volumes[vid]
return v, ok
}
func (l *DiskLocation) VolumesLen() int {
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l.volumesLock.RLock()
defer l.volumesLock.RUnlock()
return len(l.volumes)
}
func (l *DiskLocation) Close() {
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l.volumesLock.Lock()
for _, v := range l.volumes {
v.Close()
}
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l.volumesLock.Unlock()
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l.ecVolumesLock.Lock()
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for _, ecVolume := range l.ecVolumes {
ecVolume.Close()
}
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l.ecVolumesLock.Unlock()
return
}
func (l *DiskLocation) LocateVolume(vid needle.VolumeId) (os.FileInfo, bool) {
if fileInfos, err := ioutil.ReadDir(l.Directory); err == nil {
for _, fileInfo := range fileInfos {
volId, _, err := l.volumeIdFromPath(fileInfo)
if vid == volId && err == nil {
return fileInfo, true
}
}
}
return nil, false
}
func (l *DiskLocation) UnUsedSpace(volumeSizeLimit uint64) (unUsedSpace uint64) {
l.volumesLock.RLock()
defer l.volumesLock.RUnlock()
for _, vol := range l.volumes {
if vol.IsReadOnly() {
continue
}
datSize, idxSize, _ := vol.FileStat()
unUsedSpace += volumeSizeLimit - (datSize + idxSize)
}
return
}
func (l *DiskLocation) CheckDiskSpace() {
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for {
if dir, e := filepath.Abs(l.Directory); e == nil {
s := stats.NewDiskStatus(dir)
stats.VolumeServerResourceGauge.WithLabelValues(l.Directory, "all").Set(float64(s.All))
stats.VolumeServerResourceGauge.WithLabelValues(l.Directory, "used").Set(float64(s.Used))
stats.VolumeServerResourceGauge.WithLabelValues(l.Directory, "free").Set(float64(s.Free))
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if (s.PercentFree < l.MinFreeSpacePercent) != l.isDiskSpaceLow {
l.isDiskSpaceLow = !l.isDiskSpaceLow
}
if l.isDiskSpaceLow {
glog.V(0).Infof("dir %s freePercent %.2f%% < min %.2f%%, isLowDiskSpace: %v", dir, s.PercentFree, l.MinFreeSpacePercent, l.isDiskSpaceLow)
} else {
glog.V(4).Infof("dir %s freePercent %.2f%% < min %.2f%%, isLowDiskSpace: %v", dir, s.PercentFree, l.MinFreeSpacePercent, l.isDiskSpaceLow)
}
}
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time.Sleep(time.Minute)
}
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}