mirror of
https://github.com/seaweedfs/seaweedfs.git
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122 lines
3.4 KiB
Go
122 lines
3.4 KiB
Go
package topology
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import (
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"code.google.com/p/weed-fs/go/storage"
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"errors"
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"fmt"
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"math/rand"
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)
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type VolumeLayout struct {
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repType storage.ReplicationType
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vid2location map[storage.VolumeId]*VolumeLocationList
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writables []storage.VolumeId // transient array of writable volume id
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pulse int64
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volumeSizeLimit uint64
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}
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func NewVolumeLayout(repType storage.ReplicationType, volumeSizeLimit uint64, pulse int64) *VolumeLayout {
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return &VolumeLayout{
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repType: repType,
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vid2location: make(map[storage.VolumeId]*VolumeLocationList),
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writables: *new([]storage.VolumeId),
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pulse: pulse,
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volumeSizeLimit: volumeSizeLimit,
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}
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}
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func (vl *VolumeLayout) RegisterVolume(v *storage.VolumeInfo, dn *DataNode) {
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if _, ok := vl.vid2location[v.Id]; !ok {
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vl.vid2location[v.Id] = NewVolumeLocationList()
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}
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if vl.vid2location[v.Id].Add(dn) {
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if len(vl.vid2location[v.Id].list) == v.RepType.GetCopyCount() {
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if vl.isWritable(v) {
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vl.writables = append(vl.writables, v.Id)
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}
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}
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}
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}
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func (vl *VolumeLayout) isWritable(v *storage.VolumeInfo) bool {
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return uint64(v.Size) < vl.volumeSizeLimit &&
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v.Version == storage.CurrentVersion &&
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!v.ReadOnly
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}
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func (vl *VolumeLayout) Lookup(vid storage.VolumeId) []*DataNode {
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if location := vl.vid2location[vid]; location != nil {
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return location.list
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}
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return nil
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}
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func (vl *VolumeLayout) PickForWrite(count int) (*storage.VolumeId, int, *VolumeLocationList, error) {
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len_writers := len(vl.writables)
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if len_writers <= 0 {
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fmt.Println("No more writable volumes!")
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return nil, 0, nil, errors.New("No more writable volumes!")
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}
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vid := vl.writables[rand.Intn(len_writers)]
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locationList := vl.vid2location[vid]
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if locationList != nil {
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return &vid, count, locationList, nil
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}
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return nil, 0, nil, errors.New("Strangely vid " + vid.String() + " is on no machine!")
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}
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func (vl *VolumeLayout) GetActiveVolumeCount() int {
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return len(vl.writables)
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}
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func (vl *VolumeLayout) removeFromWritable(vid storage.VolumeId) bool {
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for i, v := range vl.writables {
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if v == vid {
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fmt.Println("Volume", vid, "becomes unwritable")
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vl.writables = append(vl.writables[:i], vl.writables[i+1:]...)
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return true
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}
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}
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return false
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}
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func (vl *VolumeLayout) setVolumeWritable(vid storage.VolumeId) bool {
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for _, v := range vl.writables {
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if v == vid {
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return false
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}
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}
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fmt.Println("Volume", vid, "becomes writable")
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vl.writables = append(vl.writables, vid)
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return true
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}
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func (vl *VolumeLayout) SetVolumeUnavailable(dn *DataNode, vid storage.VolumeId) bool {
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if vl.vid2location[vid].Remove(dn) {
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if vl.vid2location[vid].Length() < vl.repType.GetCopyCount() {
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fmt.Println("Volume", vid, "has", vl.vid2location[vid].Length(), "replica, less than required", vl.repType.GetCopyCount())
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return vl.removeFromWritable(vid)
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}
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}
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return false
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}
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func (vl *VolumeLayout) SetVolumeAvailable(dn *DataNode, vid storage.VolumeId) bool {
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if vl.vid2location[vid].Add(dn) {
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if vl.vid2location[vid].Length() >= vl.repType.GetCopyCount() {
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return vl.setVolumeWritable(vid)
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}
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}
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return false
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}
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func (vl *VolumeLayout) SetVolumeCapacityFull(vid storage.VolumeId) bool {
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return vl.removeFromWritable(vid)
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}
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func (vl *VolumeLayout) ToMap() interface{} {
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m := make(map[string]interface{})
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m["replication"] = vl.repType.String()
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m["writables"] = vl.writables
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//m["locations"] = vl.vid2location
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return m
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}
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