seaweedfs/weed/storage/disk_location.go

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package storage
import (
"io/ioutil"
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"os"
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"strings"
"sync"
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"fmt"
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"github.com/joeslay/seaweedfs/weed/glog"
"github.com/joeslay/seaweedfs/weed/storage/erasure_coding"
"github.com/joeslay/seaweedfs/weed/storage/needle"
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)
type DiskLocation struct {
Directory string
MaxVolumeCount int
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volumes map[needle.VolumeId]*Volume
sync.RWMutex
// erasure coding
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ecVolumes map[needle.VolumeId]*erasure_coding.EcVolume
ecVolumesLock sync.RWMutex
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}
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func NewDiskLocation(dir string, maxVolumeCount int) *DiskLocation {
location := &DiskLocation{Directory: dir, MaxVolumeCount: maxVolumeCount}
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location.volumes = make(map[needle.VolumeId]*Volume)
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location.ecVolumes = make(map[needle.VolumeId]*erasure_coding.EcVolume)
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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, ".dat") {
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base := name[:len(name)-len(".dat")]
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
}
func (l *DiskLocation) loadExistingVolume(fileInfo os.FileInfo, needleMapKind NeedleMapType) {
name := fileInfo.Name()
if !fileInfo.IsDir() && strings.HasSuffix(name, ".dat") {
vid, collection, err := l.volumeIdFromPath(fileInfo)
if err == nil {
l.RLock()
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_, found := l.volumes[vid]
l.RUnlock()
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if !found {
if v, e := NewVolume(l.Directory, collection, vid, needleMapKind, nil, nil, 0, false); e == nil {
l.Lock()
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l.volumes[vid] = v
l.Unlock()
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size, _, _ := v.FileStat()
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glog.V(0).Infof("data file %s, replicaPlacement=%s v=%d size=%d ttl=%s",
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l.Directory+"/"+name, v.ReplicaPlacement, v.Version(), size, v.Ttl.String())
// println("volume", vid, "last append at", v.lastAppendAtNs)
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} else {
glog.V(0).Infof("new volume %s error %s", name, e)
}
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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 {
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.Lock()
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for k, v := range l.volumes {
if v.Collection == collection {
e = l.deleteVolumeById(k)
if e != nil {
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l.Unlock()
return
}
}
}
l.Unlock()
l.ecVolumesLock.Lock()
for k, v := range l.ecVolumes {
if v.Collection == collection {
e = l.deleteEcVolumeById(k)
if e != nil {
l.ecVolumesLock.Unlock()
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return
}
}
}
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l.ecVolumesLock.Unlock()
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return
}
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func (l *DiskLocation) deleteVolumeById(vid needle.VolumeId) (e error) {
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v, ok := l.volumes[vid]
if !ok {
return
}
e = v.Destroy()
if e != nil {
return
}
delete(l.volumes, vid)
return
}
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func (l *DiskLocation) LoadVolume(vid needle.VolumeId, needleMapKind NeedleMapType) bool {
if fileInfos, err := ioutil.ReadDir(l.Directory); err == nil {
for _, fileInfo := range fileInfos {
volId, _, err := l.volumeIdFromPath(fileInfo)
if vid == volId && err == nil {
l.loadExistingVolume(fileInfo, needleMapKind)
return true
}
}
}
return false
}
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func (l *DiskLocation) DeleteVolume(vid needle.VolumeId) error {
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l.Lock()
defer l.Unlock()
_, ok := l.volumes[vid]
if !ok {
return fmt.Errorf("Volume not found, VolumeId: %d", vid)
}
return l.deleteVolumeById(vid)
}
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func (l *DiskLocation) UnloadVolume(vid needle.VolumeId) error {
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l.Lock()
defer l.Unlock()
v, ok := l.volumes[vid]
if !ok {
return fmt.Errorf("Volume not loaded, VolumeId: %d", vid)
}
v.Close()
delete(l.volumes, vid)
return nil
}
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func (l *DiskLocation) SetVolume(vid needle.VolumeId, volume *Volume) {
l.Lock()
defer l.Unlock()
l.volumes[vid] = volume
}
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func (l *DiskLocation) FindVolume(vid needle.VolumeId) (*Volume, bool) {
l.RLock()
defer l.RUnlock()
v, ok := l.volumes[vid]
return v, ok
}
func (l *DiskLocation) VolumesLen() int {
l.RLock()
defer l.RUnlock()
return len(l.volumes)
}
func (l *DiskLocation) Close() {
l.Lock()
for _, v := range l.volumes {
v.Close()
}
l.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
}