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https://github.com/seaweedfs/seaweedfs.git
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0563773944
fix bugs during volume compaction
149 lines
4.8 KiB
Go
149 lines
4.8 KiB
Go
package replication
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import (
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"code.google.com/p/weed-fs/go/glog"
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"code.google.com/p/weed-fs/go/storage"
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"code.google.com/p/weed-fs/go/topology"
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"fmt"
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"math/rand"
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"sync"
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)
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/*
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This package is created to resolve these replica placement issues:
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1. growth factor for each replica level, e.g., add 10 volumes for 1 copy, 20 volumes for 2 copies, 30 volumes for 3 copies
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2. in time of tight storage, how to reduce replica level
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3. optimizing for hot data on faster disk, cold data on cheaper storage,
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4. volume allocation for each bucket
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*/
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type VolumeGrowth struct {
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accessLock sync.Mutex
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}
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func NewDefaultVolumeGrowth() *VolumeGrowth {
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return &VolumeGrowth{}
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}
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// one replication type may need rp.GetCopyCount() actual volumes
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// given copyCount, how many logical volumes to create
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func (vg *VolumeGrowth) findVolumeCount(copyCount int) (count int) {
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switch copyCount {
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case 1:
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count = 7
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case 2:
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count = 6
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case 3:
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count = 3
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default:
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count = 1
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}
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return
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}
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func (vg *VolumeGrowth) AutomaticGrowByType(collection string, rp *storage.ReplicaPlacement, preferredDataCenter string, topo *topology.Topology) (count int, err error) {
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count, err = vg.GrowByCountAndType(vg.findVolumeCount(rp.GetCopyCount()), collection, rp, preferredDataCenter, topo)
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if count > 0 && count%rp.GetCopyCount() == 0 {
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return count, nil
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}
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return count, err
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}
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func (vg *VolumeGrowth) GrowByCountAndType(targetCount int, collection string, rp *storage.ReplicaPlacement, preferredDataCenter string, topo *topology.Topology) (counter int, err error) {
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vg.accessLock.Lock()
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defer vg.accessLock.Unlock()
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for i := 0; i < targetCount; i++ {
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if c, e := vg.findAndGrow(topo, preferredDataCenter, collection, rp); e == nil {
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counter += c
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} else {
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return counter, e
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}
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}
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return
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}
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func (vg *VolumeGrowth) findAndGrow(topo *topology.Topology, preferredDataCenter string, collection string, rp *storage.ReplicaPlacement) (int, error) {
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servers, e := vg.findEmptySlotsForOneVolume(topo, preferredDataCenter, rp)
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if e != nil {
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return 0, e
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}
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vid := topo.NextVolumeId()
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err := vg.grow(topo, vid, collection, rp, servers...)
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return len(servers), err
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}
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func (vg *VolumeGrowth) findEmptySlotsForOneVolume(topo *topology.Topology, preferredDataCenter string, rp *storage.ReplicaPlacement) (servers []*topology.DataNode, err error) {
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//find main datacenter and other data centers
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mainDataCenter, otherDataCenters, dc_err := topo.RandomlyPickNodes(rp.DiffDataCenterCount+1, func(node topology.Node) error {
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if preferredDataCenter != "" && node.IsDataCenter() && node.Id() != topology.NodeId(preferredDataCenter) {
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return fmt.Errorf("Not matching preferred:%s", preferredDataCenter)
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}
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if node.FreeSpace() < rp.DiffRackCount+rp.SameRackCount+1 {
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return fmt.Errorf("Free:%d < Expected:%d", node.FreeSpace(), rp.DiffRackCount+rp.SameRackCount+1)
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}
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return nil
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})
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if dc_err != nil {
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return nil, dc_err
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}
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//find main rack and other racks
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mainRack, otherRacks, rack_err := mainDataCenter.(*topology.DataCenter).RandomlyPickNodes(rp.DiffRackCount+1, func(node topology.Node) error {
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if node.FreeSpace() < rp.SameRackCount+1 {
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return fmt.Errorf("Free:%d < Expected:%d", node.FreeSpace(), rp.SameRackCount+1)
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}
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return nil
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})
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if rack_err != nil {
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return nil, rack_err
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}
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//find main rack and other racks
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mainServer, otherServers, server_err := mainRack.(*topology.Rack).RandomlyPickNodes(rp.SameRackCount+1, func(node topology.Node) error {
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if node.FreeSpace() < 1 {
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return fmt.Errorf("Free:%d < Expected:%d", node.FreeSpace(), 1)
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}
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return nil
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})
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if server_err != nil {
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return nil, server_err
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}
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servers = append(servers, mainServer.(*topology.DataNode))
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for _, server := range otherServers {
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servers = append(servers, server.(*topology.DataNode))
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}
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for _, rack := range otherRacks {
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r := rand.Intn(rack.FreeSpace())
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if server, e := rack.ReserveOneVolume(r); e == nil {
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servers = append(servers, server)
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} else {
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return servers, e
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}
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}
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for _, datacenter := range otherDataCenters {
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r := rand.Intn(datacenter.FreeSpace())
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if server, e := datacenter.ReserveOneVolume(r); e == nil {
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servers = append(servers, server)
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} else {
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return servers, e
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}
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}
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return
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}
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func (vg *VolumeGrowth) grow(topo *topology.Topology, vid storage.VolumeId, collection string, rp *storage.ReplicaPlacement, servers ...*topology.DataNode) error {
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for _, server := range servers {
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if err := AllocateVolume(server, vid, collection, rp); err == nil {
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vi := storage.VolumeInfo{Id: vid, Size: 0, Collection: collection, ReplicaPlacement: rp, Version: storage.CurrentVersion}
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server.AddOrUpdateVolume(vi)
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topo.RegisterVolumeLayout(vi, server)
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glog.V(0).Infoln("Created Volume", vid, "on", server)
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} else {
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glog.V(0).Infoln("Failed to assign", vid, "to", servers, "error", err)
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return fmt.Errorf("Failed to assign %s: %s", vid.String(), err.Error())
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}
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}
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return nil
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}
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