seaweedfs/weed/topology/node.go

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package topology
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import (
"errors"
"github.com/chrislusf/seaweedfs/weed/storage"
"math/rand"
"strings"
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"sync"
"sync/atomic"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/storage/erasure_coding"
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"github.com/chrislusf/seaweedfs/weed/storage/needle"
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)
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type NodeId string
type Node interface {
Id() NodeId
String() string
FreeSpace() int64
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AvailableSpaceFor(option *VolumeGrowOption) int64
ReserveOneVolume(r int64, option *VolumeGrowOption) (*DataNode, error)
UpAdjustMaxVolumeCountDelta(maxVolumeCountDelta int64)
UpAdjustMaxSsdVolumeCountDelta(maxSsdVolumeCountDelta int64)
UpAdjustVolumeCountDelta(volumeCountDelta int64)
UpAdjustSsdVolumeCountDelta(ssdVolumeCountDelta int64)
UpAdjustRemoteVolumeCountDelta(remoteVolumeCountDelta int64)
UpAdjustEcShardCountDelta(ecShardCountDelta int64)
UpAdjustActiveVolumeCountDelta(activeVolumeCountDelta int64)
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UpAdjustMaxVolumeId(vid needle.VolumeId)
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GetVolumeCount() int64
GetSsdVolumeCount() int64
GetEcShardCount() int64
GetActiveVolumeCount() int64
GetRemoteVolumeCount() int64
GetMaxVolumeCount() int64
GetMaxSsdVolumeCount() int64
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GetMaxVolumeId() needle.VolumeId
SetParent(Node)
LinkChildNode(node Node)
UnlinkChildNode(nodeId NodeId)
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CollectDeadNodeAndFullVolumes(freshThreshHold int64, volumeSizeLimit uint64)
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IsDataNode() bool
IsRack() bool
IsDataCenter() bool
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Children() []Node
Parent() Node
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GetValue() interface{} //get reference to the topology,dc,rack,datanode
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}
type NodeImpl struct {
volumeCount int64
remoteVolumeCount int64
ssdVolumeCount int64
activeVolumeCount int64
ecShardCount int64
maxVolumeCount int64
maxSsdVolumeCount int64
id NodeId
parent Node
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sync.RWMutex // lock children
children map[NodeId]Node
maxVolumeId needle.VolumeId
//for rack, data center, topology
nodeType string
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value interface{}
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}
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// the first node must satisfy filterFirstNodeFn(), the rest nodes must have one free slot
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func (n *NodeImpl) PickNodesByWeight(numberOfNodes int, option *VolumeGrowOption, filterFirstNodeFn func(dn Node) error) (firstNode Node, restNodes []Node, err error) {
var totalWeights int64
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var errs []string
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n.RLock()
candidates := make([]Node, 0, len(n.children))
candidatesWeights := make([]int64, 0, len(n.children))
//pick nodes which has enough free volumes as candidates, and use free volumes number as node weight.
for _, node := range n.children {
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if node.AvailableSpaceFor(option) <= 0 {
continue
}
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totalWeights += node.AvailableSpaceFor(option)
candidates = append(candidates, node)
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candidatesWeights = append(candidatesWeights, node.AvailableSpaceFor(option))
}
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n.RUnlock()
if len(candidates) < numberOfNodes {
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glog.V(0).Infoln(n.Id(), "failed to pick", numberOfNodes, "from ", len(candidates), "node candidates")
return nil, nil, errors.New("No enough data node found!")
}
//pick nodes randomly by weights, the node picked earlier has higher final weights
sortedCandidates := make([]Node, 0, len(candidates))
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for i := 0; i < len(candidates); i++ {
weightsInterval := rand.Int63n(totalWeights)
lastWeights := int64(0)
for k, weights := range candidatesWeights {
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if (weightsInterval >= lastWeights) && (weightsInterval < lastWeights+weights) {
sortedCandidates = append(sortedCandidates, candidates[k])
candidatesWeights[k] = 0
totalWeights -= weights
break
}
lastWeights += weights
}
}
restNodes = make([]Node, 0, numberOfNodes-1)
ret := false
n.RLock()
for k, node := range sortedCandidates {
if err := filterFirstNodeFn(node); err == nil {
firstNode = node
if k >= numberOfNodes-1 {
restNodes = sortedCandidates[:numberOfNodes-1]
} else {
restNodes = append(restNodes, sortedCandidates[:k]...)
restNodes = append(restNodes, sortedCandidates[k+1:numberOfNodes]...)
}
ret = true
break
} else {
errs = append(errs, string(node.Id())+":"+err.Error())
}
}
n.RUnlock()
if !ret {
return nil, nil, errors.New("No matching data node found! \n" + strings.Join(errs, "\n"))
}
return
}
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func (n *NodeImpl) IsDataNode() bool {
return n.nodeType == "DataNode"
}
func (n *NodeImpl) IsRack() bool {
return n.nodeType == "Rack"
}
func (n *NodeImpl) IsDataCenter() bool {
return n.nodeType == "DataCenter"
}
func (n *NodeImpl) String() string {
if n.parent != nil {
return n.parent.String() + ":" + string(n.id)
}
return string(n.id)
}
func (n *NodeImpl) Id() NodeId {
return n.id
}
func (n *NodeImpl) AvailableSpaceFor(option *VolumeGrowOption) int64 {
freeVolumeSlotCount := n.maxVolumeCount + n.remoteVolumeCount - n.volumeCount
if option.DiskType == storage.SsdType {
freeVolumeSlotCount = n.maxSsdVolumeCount - n.ssdVolumeCount
}
if n.ecShardCount > 0 {
freeVolumeSlotCount = freeVolumeSlotCount - n.ecShardCount/erasure_coding.DataShardsCount - 1
}
return freeVolumeSlotCount
}
func (n *NodeImpl) FreeSpace() int64 {
freeVolumeSlotCount := n.maxVolumeCount + n.maxSsdVolumeCount + n.remoteVolumeCount - n.volumeCount - n.ssdVolumeCount
if n.ecShardCount > 0 {
freeVolumeSlotCount = freeVolumeSlotCount - n.ecShardCount/erasure_coding.DataShardsCount - 1
}
return freeVolumeSlotCount
}
func (n *NodeImpl) SetParent(node Node) {
n.parent = node
}
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func (n *NodeImpl) Children() (ret []Node) {
n.RLock()
defer n.RUnlock()
for _, c := range n.children {
ret = append(ret, c)
}
return ret
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}
func (n *NodeImpl) Parent() Node {
return n.parent
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}
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func (n *NodeImpl) GetValue() interface{} {
return n.value
}
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func (n *NodeImpl) ReserveOneVolume(r int64, option *VolumeGrowOption) (assignedNode *DataNode, err error) {
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n.RLock()
defer n.RUnlock()
for _, node := range n.children {
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freeSpace := node.AvailableSpaceFor(option)
// fmt.Println("r =", r, ", node =", node, ", freeSpace =", freeSpace)
if freeSpace <= 0 {
continue
}
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if r >= freeSpace {
r -= freeSpace
} else {
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if node.IsDataNode() && node.AvailableSpaceFor(option) > 0 {
// fmt.Println("vid =", vid, " assigned to node =", node, ", freeSpace =", node.FreeSpace())
return node.(*DataNode), nil
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}
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assignedNode, err = node.ReserveOneVolume(r, option)
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if err == nil {
return
}
}
}
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return nil, errors.New("No free volume slot found!")
}
func (n *NodeImpl) UpAdjustMaxVolumeCountDelta(maxVolumeCountDelta int64) { //can be negative
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if maxVolumeCountDelta == 0 {
return
}
atomic.AddInt64(&n.maxVolumeCount, maxVolumeCountDelta)
if n.parent != nil {
n.parent.UpAdjustMaxVolumeCountDelta(maxVolumeCountDelta)
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}
}
func (n *NodeImpl) UpAdjustMaxSsdVolumeCountDelta(maxSsdVolumeCountDelta int64) { //can be negative
if maxSsdVolumeCountDelta == 0 {
return
}
atomic.AddInt64(&n.maxSsdVolumeCount, maxSsdVolumeCountDelta)
if n.parent != nil {
n.parent.UpAdjustMaxSsdVolumeCountDelta(maxSsdVolumeCountDelta)
}
}
func (n *NodeImpl) UpAdjustVolumeCountDelta(volumeCountDelta int64) { //can be negative
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if volumeCountDelta == 0 {
return
}
atomic.AddInt64(&n.volumeCount, volumeCountDelta)
if n.parent != nil {
n.parent.UpAdjustVolumeCountDelta(volumeCountDelta)
}
}
func (n *NodeImpl) UpAdjustRemoteVolumeCountDelta(remoteVolumeCountDelta int64) { //can be negative
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if remoteVolumeCountDelta == 0 {
return
}
atomic.AddInt64(&n.remoteVolumeCount, remoteVolumeCountDelta)
if n.parent != nil {
n.parent.UpAdjustRemoteVolumeCountDelta(remoteVolumeCountDelta)
}
}
func (n *NodeImpl) UpAdjustSsdVolumeCountDelta(ssdVolumeCountDelta int64) { //can be negative
if ssdVolumeCountDelta == 0 {
return
}
atomic.AddInt64(&n.ssdVolumeCount, ssdVolumeCountDelta)
if n.parent != nil {
n.parent.UpAdjustSsdVolumeCountDelta(ssdVolumeCountDelta)
}
}
func (n *NodeImpl) UpAdjustEcShardCountDelta(ecShardCountDelta int64) { //can be negative
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if ecShardCountDelta == 0 {
return
}
atomic.AddInt64(&n.ecShardCount, ecShardCountDelta)
if n.parent != nil {
n.parent.UpAdjustEcShardCountDelta(ecShardCountDelta)
}
}
func (n *NodeImpl) UpAdjustActiveVolumeCountDelta(activeVolumeCountDelta int64) { //can be negative
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if activeVolumeCountDelta == 0 {
return
}
atomic.AddInt64(&n.activeVolumeCount, activeVolumeCountDelta)
if n.parent != nil {
n.parent.UpAdjustActiveVolumeCountDelta(activeVolumeCountDelta)
}
}
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func (n *NodeImpl) UpAdjustMaxVolumeId(vid needle.VolumeId) { //can be negative
if n.maxVolumeId < vid {
n.maxVolumeId = vid
if n.parent != nil {
n.parent.UpAdjustMaxVolumeId(vid)
}
}
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}
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func (n *NodeImpl) GetMaxVolumeId() needle.VolumeId {
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return n.maxVolumeId
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}
func (n *NodeImpl) GetVolumeCount() int64 {
return n.volumeCount
}
func (n *NodeImpl) GetSsdVolumeCount() int64 {
return n.ssdVolumeCount
}
func (n *NodeImpl) GetEcShardCount() int64 {
return n.ecShardCount
}
func (n *NodeImpl) GetRemoteVolumeCount() int64 {
return n.remoteVolumeCount
}
func (n *NodeImpl) GetActiveVolumeCount() int64 {
return n.activeVolumeCount
}
func (n *NodeImpl) GetMaxVolumeCount() int64 {
return n.maxVolumeCount
}
func (n *NodeImpl) GetMaxSsdVolumeCount() int64 {
return n.maxSsdVolumeCount
}
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func (n *NodeImpl) LinkChildNode(node Node) {
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n.Lock()
defer n.Unlock()
if n.children[node.Id()] == nil {
n.children[node.Id()] = node
n.UpAdjustMaxVolumeCountDelta(node.GetMaxVolumeCount())
n.UpAdjustMaxSsdVolumeCountDelta(node.GetMaxSsdVolumeCount())
n.UpAdjustMaxVolumeId(node.GetMaxVolumeId())
n.UpAdjustVolumeCountDelta(node.GetVolumeCount())
n.UpAdjustSsdVolumeCountDelta(node.GetSsdVolumeCount())
n.UpAdjustRemoteVolumeCountDelta(node.GetRemoteVolumeCount())
n.UpAdjustEcShardCountDelta(node.GetEcShardCount())
n.UpAdjustActiveVolumeCountDelta(node.GetActiveVolumeCount())
node.SetParent(n)
glog.V(0).Infoln(n, "adds child", node.Id())
}
}
func (n *NodeImpl) UnlinkChildNode(nodeId NodeId) {
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n.Lock()
defer n.Unlock()
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node := n.children[nodeId]
if node != nil {
node.SetParent(nil)
delete(n.children, node.Id())
n.UpAdjustVolumeCountDelta(-node.GetVolumeCount())
n.UpAdjustSsdVolumeCountDelta(-node.GetSsdVolumeCount())
n.UpAdjustRemoteVolumeCountDelta(-node.GetRemoteVolumeCount())
n.UpAdjustEcShardCountDelta(-node.GetEcShardCount())
n.UpAdjustActiveVolumeCountDelta(-node.GetActiveVolumeCount())
n.UpAdjustMaxVolumeCountDelta(-node.GetMaxVolumeCount())
n.UpAdjustMaxSsdVolumeCountDelta(-node.GetMaxSsdVolumeCount())
glog.V(0).Infoln(n, "removes", node.Id())
}
}
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func (n *NodeImpl) CollectDeadNodeAndFullVolumes(freshThreshHold int64, volumeSizeLimit uint64) {
if n.IsRack() {
for _, c := range n.Children() {
dn := c.(*DataNode) //can not cast n to DataNode
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for _, v := range dn.GetVolumes() {
if uint64(v.Size) >= volumeSizeLimit {
//fmt.Println("volume",v.Id,"size",v.Size,">",volumeSizeLimit)
n.GetTopology().chanFullVolumes <- v
}
}
}
} else {
for _, c := range n.Children() {
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c.CollectDeadNodeAndFullVolumes(freshThreshHold, volumeSizeLimit)
}
}
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}
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func (n *NodeImpl) GetTopology() *Topology {
var p Node
p = n
for p.Parent() != nil {
p = p.Parent()
}
return p.GetValue().(*Topology)
}