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package cluster
import ( "github.com/chrislusf/seaweedfs/weed/pb" "github.com/chrislusf/seaweedfs/weed/pb/master_pb" "math" "sync" "time" )
const ( MasterType = "master" VolumeServerType = "volumeServer" FilerType = "filer" BrokerType = "broker" )
type FilerGroup string type Filers struct { filers map[pb.ServerAddress]*ClusterNode leaders *Leaders } type Leaders struct { leaders [3]pb.ServerAddress }
type ClusterNode struct { Address pb.ServerAddress Version string counter int CreatedTs time.Time }
type Cluster struct { filerGroup2filers map[FilerGroup]*Filers filersLock sync.RWMutex brokers map[pb.ServerAddress]*ClusterNode brokersLock sync.RWMutex }
func NewCluster() *Cluster { return &Cluster{ filerGroup2filers: make(map[FilerGroup]*Filers), brokers: make(map[pb.ServerAddress]*ClusterNode), } }
func (cluster *Cluster) getFilers(filerGroup FilerGroup, createIfNotFound bool) *Filers { filers, found := cluster.filerGroup2filers[filerGroup] if !found && createIfNotFound { filers = &Filers{ filers: make(map[pb.ServerAddress]*ClusterNode), leaders: &Leaders{}, } cluster.filerGroup2filers[filerGroup] = filers } return filers }
func (cluster *Cluster) AddClusterNode(ns, nodeType string, address pb.ServerAddress, version string) []*master_pb.KeepConnectedResponse { filerGroup := FilerGroup(ns) switch nodeType { case FilerType: cluster.filersLock.Lock() defer cluster.filersLock.Unlock() filers := cluster.getFilers(filerGroup, true) if existingNode, found := filers.filers[address]; found { existingNode.counter++ return nil } filers.filers[address] = &ClusterNode{ Address: address, Version: version, counter: 1, CreatedTs: time.Now(), } return cluster.ensureFilerLeaders(filers, true, filerGroup, nodeType, address) case BrokerType: cluster.brokersLock.Lock() defer cluster.brokersLock.Unlock() if existingNode, found := cluster.brokers[address]; found { existingNode.counter++ return nil } cluster.brokers[address] = &ClusterNode{ Address: address, Version: version, counter: 1, CreatedTs: time.Now(), } return []*master_pb.KeepConnectedResponse{ { ClusterNodeUpdate: &master_pb.ClusterNodeUpdate{ NodeType: nodeType, Address: string(address), IsAdd: true, }, }, } case MasterType: return []*master_pb.KeepConnectedResponse{ { ClusterNodeUpdate: &master_pb.ClusterNodeUpdate{ NodeType: nodeType, Address: string(address), IsAdd: true, }, }, } } return nil }
func (cluster *Cluster) RemoveClusterNode(ns string, nodeType string, address pb.ServerAddress) []*master_pb.KeepConnectedResponse { filerGroup := FilerGroup(ns) switch nodeType { case FilerType: cluster.filersLock.Lock() defer cluster.filersLock.Unlock() filers := cluster.getFilers(filerGroup, false) if filers == nil { return nil } if existingNode, found := filers.filers[address]; !found { return nil } else { existingNode.counter-- if existingNode.counter <= 0 { delete(filers.filers, address) return cluster.ensureFilerLeaders(filers, false, filerGroup, nodeType, address) } } case BrokerType: cluster.brokersLock.Lock() defer cluster.brokersLock.Unlock() if existingNode, found := cluster.brokers[address]; !found { return nil } else { existingNode.counter-- if existingNode.counter <= 0 { delete(cluster.brokers, address) return []*master_pb.KeepConnectedResponse{ { ClusterNodeUpdate: &master_pb.ClusterNodeUpdate{ NodeType: nodeType, Address: string(address), IsAdd: false, }, }, } } } case MasterType: return []*master_pb.KeepConnectedResponse{ { ClusterNodeUpdate: &master_pb.ClusterNodeUpdate{ NodeType: nodeType, Address: string(address), IsAdd: false, }, }, } } return nil }
func (cluster *Cluster) ListClusterNode(filerGroup FilerGroup, nodeType string) (nodes []*ClusterNode) { switch nodeType { case FilerType: cluster.filersLock.RLock() defer cluster.filersLock.RUnlock() filers := cluster.getFilers(filerGroup, false) if filers == nil { return } for _, node := range filers.filers { nodes = append(nodes, node) } case BrokerType: cluster.brokersLock.RLock() defer cluster.brokersLock.RUnlock() for _, node := range cluster.brokers { nodes = append(nodes, node) } case MasterType: } return }
func (cluster *Cluster) IsOneLeader(filerGroup FilerGroup, address pb.ServerAddress) bool { filers := cluster.getFilers(filerGroup, false) if filers == nil { return false } return filers.leaders.isOneLeader(address) }
func (cluster *Cluster) ensureFilerLeaders(filers *Filers, isAdd bool, filerGroup FilerGroup, nodeType string, address pb.ServerAddress) (result []*master_pb.KeepConnectedResponse) { if isAdd { if filers.leaders.addLeaderIfVacant(address) { // has added the address as one leader
result = append(result, &master_pb.KeepConnectedResponse{ ClusterNodeUpdate: &master_pb.ClusterNodeUpdate{ FilerGroup: string(filerGroup), NodeType: nodeType, Address: string(address), IsLeader: true, IsAdd: true, }, }) } else { result = append(result, &master_pb.KeepConnectedResponse{ ClusterNodeUpdate: &master_pb.ClusterNodeUpdate{ FilerGroup: string(filerGroup), NodeType: nodeType, Address: string(address), IsLeader: false, IsAdd: true, }, }) } } else { if filers.leaders.removeLeaderIfExists(address) {
result = append(result, &master_pb.KeepConnectedResponse{ ClusterNodeUpdate: &master_pb.ClusterNodeUpdate{ FilerGroup: string(filerGroup), NodeType: nodeType, Address: string(address), IsLeader: true, IsAdd: false, }, })
// pick the freshest one, since it is less likely to go away
var shortestDuration int64 = math.MaxInt64 now := time.Now() var candidateAddress pb.ServerAddress for _, node := range filers.filers { if filers.leaders.isOneLeader(node.Address) { continue } duration := now.Sub(node.CreatedTs).Nanoseconds() if duration < shortestDuration { shortestDuration = duration candidateAddress = node.Address } } if candidateAddress != "" { filers.leaders.addLeaderIfVacant(candidateAddress) // added a new leader
result = append(result, &master_pb.KeepConnectedResponse{ ClusterNodeUpdate: &master_pb.ClusterNodeUpdate{ NodeType: nodeType, Address: string(candidateAddress), IsLeader: true, IsAdd: true, }, }) } } else { result = append(result, &master_pb.KeepConnectedResponse{ ClusterNodeUpdate: &master_pb.ClusterNodeUpdate{ FilerGroup: string(filerGroup), NodeType: nodeType, Address: string(address), IsLeader: false, IsAdd: false, }, }) } } return }
func (leaders *Leaders) addLeaderIfVacant(address pb.ServerAddress) (hasChanged bool) { if leaders.isOneLeader(address) { return } for i := 0; i < len(leaders.leaders); i++ { if leaders.leaders[i] == "" { leaders.leaders[i] = address hasChanged = true return } } return } func (leaders *Leaders) removeLeaderIfExists(address pb.ServerAddress) (hasChanged bool) { if !leaders.isOneLeader(address) { return } for i := 0; i < len(leaders.leaders); i++ { if leaders.leaders[i] == address { leaders.leaders[i] = "" hasChanged = true return } } return } func (leaders *Leaders) isOneLeader(address pb.ServerAddress) bool { for i := 0; i < len(leaders.leaders); i++ { if leaders.leaders[i] == address { return true } } return false } func (leaders *Leaders) GetLeaders() (addresses []pb.ServerAddress) { for i := 0; i < len(leaders.leaders); i++ { if leaders.leaders[i] != "" { addresses = append(addresses, leaders.leaders[i]) } } return }
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