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282 lines
9.5 KiB
282 lines
9.5 KiB
package topology
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import (
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"encoding/json"
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"fmt"
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"github.com/seaweedfs/seaweedfs/weed/pb/master_pb"
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"math/rand"
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"sync"
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"time"
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"google.golang.org/grpc"
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"github.com/seaweedfs/seaweedfs/weed/glog"
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"github.com/seaweedfs/seaweedfs/weed/storage"
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"github.com/seaweedfs/seaweedfs/weed/storage/needle"
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"github.com/seaweedfs/seaweedfs/weed/storage/super_block"
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"github.com/seaweedfs/seaweedfs/weed/storage/types"
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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 VolumeGrowRequest struct {
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Option *VolumeGrowOption
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Count int
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}
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type volumeGrowthStrategy struct {
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Copy1Count int
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Copy2Count int
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Copy3Count int
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CopyOtherCount int
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Threshold float64
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}
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var (
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VolumeGrowStrategy = volumeGrowthStrategy{
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Copy1Count: 7,
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Copy2Count: 6,
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Copy3Count: 3,
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CopyOtherCount: 1,
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Threshold: 0.9,
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}
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)
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type VolumeGrowOption struct {
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Collection string `json:"collection,omitempty"`
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ReplicaPlacement *super_block.ReplicaPlacement `json:"replication,omitempty"`
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Ttl *needle.TTL `json:"ttl,omitempty"`
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DiskType types.DiskType `json:"disk,omitempty"`
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Preallocate int64 `json:"preallocate,omitempty"`
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DataCenter string `json:"dataCenter,omitempty"`
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Rack string `json:"rack,omitempty"`
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DataNode string `json:"dataNode,omitempty"`
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MemoryMapMaxSizeMb uint32 `json:"memoryMapMaxSizeMb,omitempty"`
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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 (o *VolumeGrowOption) String() string {
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blob, _ := json.Marshal(o)
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return string(blob)
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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 = VolumeGrowStrategy.Copy1Count
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case 2:
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count = VolumeGrowStrategy.Copy2Count
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case 3:
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count = VolumeGrowStrategy.Copy3Count
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default:
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count = VolumeGrowStrategy.CopyOtherCount
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}
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return
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}
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func (vg *VolumeGrowth) AutomaticGrowByType(option *VolumeGrowOption, grpcDialOption grpc.DialOption, topo *Topology, targetCount int) (result []*master_pb.VolumeLocation, err error) {
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if targetCount == 0 {
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targetCount = vg.findVolumeCount(option.ReplicaPlacement.GetCopyCount())
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}
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result, err = vg.GrowByCountAndType(grpcDialOption, targetCount, option, topo)
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if len(result) > 0 && len(result)%option.ReplicaPlacement.GetCopyCount() == 0 {
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return result, nil
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}
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return result, err
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}
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func (vg *VolumeGrowth) GrowByCountAndType(grpcDialOption grpc.DialOption, targetCount int, option *VolumeGrowOption, topo *Topology) (result []*master_pb.VolumeLocation, 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 res, e := vg.findAndGrow(grpcDialOption, topo, option); e == nil {
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result = append(result, res...)
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} else {
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glog.V(0).Infof("create %d volume, created %d: %v", targetCount, len(result), e)
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return result, 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(grpcDialOption grpc.DialOption, topo *Topology, option *VolumeGrowOption) (result []*master_pb.VolumeLocation, err error) {
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servers, e := vg.findEmptySlotsForOneVolume(topo, option)
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if e != nil {
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return nil, e
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}
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vid, raftErr := topo.NextVolumeId()
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if raftErr != nil {
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return nil, raftErr
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}
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if err = vg.grow(grpcDialOption, topo, vid, option, servers...); err == nil {
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for _, server := range servers {
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result = append(result, &master_pb.VolumeLocation{
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Url: server.Url(),
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PublicUrl: server.PublicUrl,
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DataCenter: server.GetDataCenterId(),
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NewVids: []uint32{uint32(vid)},
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})
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}
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}
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return
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}
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// 1. find the main data node
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// 1.1 collect all data nodes that have 1 slots
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// 2.2 collect all racks that have rp.SameRackCount+1
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// 2.2 collect all data centers that have DiffRackCount+rp.SameRackCount+1
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// 2. find rest data nodes
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func (vg *VolumeGrowth) findEmptySlotsForOneVolume(topo *Topology, option *VolumeGrowOption) (servers []*DataNode, err error) {
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//find main datacenter and other data centers
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rp := option.ReplicaPlacement
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mainDataCenter, otherDataCenters, dc_err := topo.PickNodesByWeight(rp.DiffDataCenterCount+1, option, func(node Node) error {
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if option.DataCenter != "" && node.IsDataCenter() && node.Id() != NodeId(option.DataCenter) {
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return fmt.Errorf("Not matching preferred data center:%s", option.DataCenter)
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}
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if len(node.Children()) < rp.DiffRackCount+1 {
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return fmt.Errorf("Only has %d racks, not enough for %d.", len(node.Children()), rp.DiffRackCount+1)
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}
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if node.AvailableSpaceFor(option) < int64(rp.DiffRackCount+rp.SameRackCount+1) {
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return fmt.Errorf("Free:%d < Expected:%d", node.AvailableSpaceFor(option), rp.DiffRackCount+rp.SameRackCount+1)
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}
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possibleRacksCount := 0
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for _, rack := range node.Children() {
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possibleDataNodesCount := 0
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for _, n := range rack.Children() {
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if n.AvailableSpaceFor(option) >= 1 {
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possibleDataNodesCount++
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}
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}
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if possibleDataNodesCount >= rp.SameRackCount+1 {
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possibleRacksCount++
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}
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}
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if possibleRacksCount < rp.DiffRackCount+1 {
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return fmt.Errorf("Only has %d racks with more than %d free data nodes, not enough for %d.", possibleRacksCount, rp.SameRackCount+1, rp.DiffRackCount+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, rackErr := mainDataCenter.(*DataCenter).PickNodesByWeight(rp.DiffRackCount+1, option, func(node Node) error {
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if option.Rack != "" && node.IsRack() && node.Id() != NodeId(option.Rack) {
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return fmt.Errorf("Not matching preferred rack:%s", option.Rack)
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}
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if node.AvailableSpaceFor(option) < int64(rp.SameRackCount+1) {
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return fmt.Errorf("Free:%d < Expected:%d", node.AvailableSpaceFor(option), rp.SameRackCount+1)
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}
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if len(node.Children()) < rp.SameRackCount+1 {
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// a bit faster way to test free racks
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return fmt.Errorf("Only has %d data nodes, not enough for %d.", len(node.Children()), rp.SameRackCount+1)
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}
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possibleDataNodesCount := 0
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for _, n := range node.Children() {
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if n.AvailableSpaceFor(option) >= 1 {
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possibleDataNodesCount++
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}
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}
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if possibleDataNodesCount < rp.SameRackCount+1 {
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return fmt.Errorf("Only has %d data nodes with a slot, not enough for %d.", possibleDataNodesCount, rp.SameRackCount+1)
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}
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return nil
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})
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if rackErr != nil {
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return nil, rackErr
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}
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//find main server and other servers
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mainServer, otherServers, serverErr := mainRack.(*Rack).PickNodesByWeight(rp.SameRackCount+1, option, func(node Node) error {
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if option.DataNode != "" && node.IsDataNode() && node.Id() != NodeId(option.DataNode) {
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return fmt.Errorf("Not matching preferred data node:%s", option.DataNode)
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}
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if node.AvailableSpaceFor(option) < 1 {
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return fmt.Errorf("Free:%d < Expected:%d", node.AvailableSpaceFor(option), 1)
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}
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return nil
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})
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if serverErr != nil {
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return nil, serverErr
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}
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servers = append(servers, mainServer.(*DataNode))
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for _, server := range otherServers {
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servers = append(servers, server.(*DataNode))
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}
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for _, rack := range otherRacks {
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r := rand.Int63n(rack.AvailableSpaceFor(option))
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if server, e := rack.ReserveOneVolume(r, option); 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.Int63n(datacenter.AvailableSpaceFor(option))
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if server, e := datacenter.ReserveOneVolume(r, option); 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(grpcDialOption grpc.DialOption, topo *Topology, vid needle.VolumeId, option *VolumeGrowOption, servers ...*DataNode) (growErr error) {
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var createdVolumes []storage.VolumeInfo
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for _, server := range servers {
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if err := AllocateVolume(server, grpcDialOption, vid, option); err == nil {
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createdVolumes = append(createdVolumes, storage.VolumeInfo{
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Id: vid,
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Size: 0,
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Collection: option.Collection,
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ReplicaPlacement: option.ReplicaPlacement,
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Ttl: option.Ttl,
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Version: needle.CurrentVersion,
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DiskType: option.DiskType.String(),
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ModifiedAtSecond: time.Now().Unix(),
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})
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glog.V(0).Infof("Created Volume %d on %s", vid, server.NodeImpl.String())
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} else {
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glog.Warningf("Failed to assign volume %d on %s: %v", vid, server.NodeImpl.String(), err)
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growErr = fmt.Errorf("failed to assign volume %d on %s: %v", vid, server.NodeImpl.String(), err)
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break
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}
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}
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if growErr == nil {
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for i, vi := range createdVolumes {
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server := servers[i]
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server.AddOrUpdateVolume(vi)
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topo.RegisterVolumeLayout(vi, server)
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glog.V(0).Infof("Registered Volume %d on %s", vid, server.NodeImpl.String())
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}
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} else {
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// cleaning up created volume replicas
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for i, vi := range createdVolumes {
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server := servers[i]
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if err := DeleteVolume(server, grpcDialOption, vi.Id); err != nil {
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glog.Warningf("Failed to clean up volume %d on %s", vid, server.NodeImpl.String())
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}
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}
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}
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return growErr
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}
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