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switch to ReadAt() for thread-safe read

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fix bugs during volume compaction
This commit is contained in:
Chris Lu
2014-03-19 04:48:13 -07:00
parent 463589da01
commit 0563773944
5 changed files with 42 additions and 32 deletions
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28
go/topology/volume_layout.go
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@@ -33,15 +33,22 @@ func (vl *VolumeLayout) RegisterVolume(v *storage.VolumeInfo, dn *DataNode) {
if _, ok := vl.vid2location[v.Id]; !ok {
vl.vid2location[v.Id] = NewVolumeLocationList()
}
if vl.vid2location[v.Id].Add(dn) {
if len(vl.vid2location[v.Id].list) == v.ReplicaPlacement.GetCopyCount() {
if vl.isWritable(v) {
vl.writables = append(vl.writables, v.Id)
} else {
vl.removeFromWritable(v.Id)
}
vl.vid2location[v.Id].Set(dn)
glog.V(3).Infoln("volume", v.Id, "added to dn", dn, "len", vl.vid2location[v.Id].Length(), "copy", v.ReplicaPlacement.GetCopyCount())
if vl.vid2location[v.Id].Length() == vl.rp.GetCopyCount() && vl.isWritable(v) {
vl.AddToWritable(v.Id)
} else {
vl.removeFromWritable(v.Id)
}
}
func (vl *VolumeLayout) AddToWritable(vid storage.VolumeId) {
for _, id := range vl.writables {
if vid == id {
return
}
}
vl.writables = append(vl.writables, vid)
}
func (vl *VolumeLayout) isWritable(v *storage.VolumeInfo) bool {
@@ -156,10 +163,9 @@ func (vl *VolumeLayout) SetVolumeAvailable(dn *DataNode, vid storage.VolumeId) b
vl.accessLock.Lock()
defer vl.accessLock.Unlock()
if vl.vid2location[vid].Add(dn) {
if vl.vid2location[vid].Length() >= vl.rp.GetCopyCount() {
return vl.setVolumeWritable(vid)
}
vl.vid2location[vid].Set(dn)
if vl.vid2location[vid].Length() >= vl.rp.GetCopyCount() {
return vl.setVolumeWritable(vid)
}
return false
}