mirror of
https://github.com/seaweedfs/seaweedfs.git
synced 2024-12-03 00:49:13 +08:00
305 lines
8.3 KiB
Go
305 lines
8.3 KiB
Go
package shell
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
"io"
|
|
"math/rand"
|
|
"sort"
|
|
|
|
"github.com/chrislusf/seaweedfs/weed/operation"
|
|
"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
|
|
"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
|
|
"github.com/chrislusf/seaweedfs/weed/storage/super_block"
|
|
)
|
|
|
|
func init() {
|
|
Commands = append(Commands, &commandVolumeFixReplication{})
|
|
}
|
|
|
|
type commandVolumeFixReplication struct {
|
|
}
|
|
|
|
func (c *commandVolumeFixReplication) Name() string {
|
|
return "volume.fix.replication"
|
|
}
|
|
|
|
func (c *commandVolumeFixReplication) Help() string {
|
|
return `add replicas to volumes that are missing replicas
|
|
|
|
This command file all under-replicated volumes, and find volume servers with free slots.
|
|
If the free slots satisfy the replication requirement, the volume content is copied over and mounted.
|
|
|
|
volume.fix.replication -n # do not take action
|
|
volume.fix.replication # actually copying the volume files and mount the volume
|
|
|
|
Note:
|
|
* each time this will only add back one replica for one volume id. If there are multiple replicas
|
|
are missing, e.g. multiple volume servers are new, you may need to run this multiple times.
|
|
* do not run this too quick within seconds, since the new volume replica may take a few seconds
|
|
to register itself to the master.
|
|
|
|
`
|
|
}
|
|
|
|
func (c *commandVolumeFixReplication) Do(args []string, commandEnv *CommandEnv, writer io.Writer) (err error) {
|
|
|
|
if err = commandEnv.confirmIsLocked(); err != nil {
|
|
return
|
|
}
|
|
|
|
takeAction := true
|
|
if len(args) > 0 && args[0] == "-n" {
|
|
takeAction = false
|
|
}
|
|
|
|
var resp *master_pb.VolumeListResponse
|
|
err = commandEnv.MasterClient.WithClient(func(client master_pb.SeaweedClient) error {
|
|
resp, err = client.VolumeList(context.Background(), &master_pb.VolumeListRequest{})
|
|
return err
|
|
})
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// find all volumes that needs replication
|
|
// collect all data nodes
|
|
replicatedVolumeLocations := make(map[uint32][]location)
|
|
replicatedVolumeInfo := make(map[uint32]*master_pb.VolumeInformationMessage)
|
|
var allLocations []location
|
|
eachDataNode(resp.TopologyInfo, func(dc string, rack RackId, dn *master_pb.DataNodeInfo) {
|
|
loc := newLocation(dc, string(rack), dn)
|
|
for _, v := range dn.VolumeInfos {
|
|
if v.ReplicaPlacement > 0 {
|
|
replicatedVolumeLocations[v.Id] = append(replicatedVolumeLocations[v.Id], loc)
|
|
replicatedVolumeInfo[v.Id] = v
|
|
}
|
|
}
|
|
allLocations = append(allLocations, loc)
|
|
})
|
|
|
|
// find all under replicated volumes
|
|
underReplicatedVolumeLocations := make(map[uint32][]location)
|
|
for vid, locations := range replicatedVolumeLocations {
|
|
volumeInfo := replicatedVolumeInfo[vid]
|
|
replicaPlacement, _ := super_block.NewReplicaPlacementFromByte(byte(volumeInfo.ReplicaPlacement))
|
|
if replicaPlacement.GetCopyCount() > len(locations) {
|
|
underReplicatedVolumeLocations[vid] = locations
|
|
}
|
|
}
|
|
|
|
if len(underReplicatedVolumeLocations) == 0 {
|
|
return fmt.Errorf("no under replicated volumes")
|
|
}
|
|
|
|
if len(allLocations) == 0 {
|
|
return fmt.Errorf("no data nodes at all")
|
|
}
|
|
|
|
// find the most under populated data nodes
|
|
keepDataNodesSorted(allLocations)
|
|
|
|
for vid, locations := range underReplicatedVolumeLocations {
|
|
volumeInfo := replicatedVolumeInfo[vid]
|
|
replicaPlacement, _ := super_block.NewReplicaPlacementFromByte(byte(volumeInfo.ReplicaPlacement))
|
|
foundNewLocation := false
|
|
for _, dst := range allLocations {
|
|
// check whether data nodes satisfy the constraints
|
|
if dst.dataNode.FreeVolumeCount > 0 && satisfyReplicaPlacement(replicaPlacement, locations, dst) {
|
|
// ask the volume server to replicate the volume
|
|
sourceNodes := underReplicatedVolumeLocations[vid]
|
|
sourceNode := sourceNodes[rand.Intn(len(sourceNodes))]
|
|
foundNewLocation = true
|
|
fmt.Fprintf(writer, "replicating volume %d %s from %s to dataNode %s ...\n", volumeInfo.Id, replicaPlacement, sourceNode.dataNode.Id, dst.dataNode.Id)
|
|
|
|
if !takeAction {
|
|
break
|
|
}
|
|
|
|
err := operation.WithVolumeServerClient(dst.dataNode.Id, commandEnv.option.GrpcDialOption, func(volumeServerClient volume_server_pb.VolumeServerClient) error {
|
|
_, replicateErr := volumeServerClient.VolumeCopy(context.Background(), &volume_server_pb.VolumeCopyRequest{
|
|
VolumeId: volumeInfo.Id,
|
|
SourceDataNode: sourceNode.dataNode.Id,
|
|
})
|
|
return fmt.Errorf("copying from %s => %s : %v", sourceNode.dataNode.Id, dst.dataNode.Id, replicateErr)
|
|
})
|
|
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// adjust free volume count
|
|
dst.dataNode.FreeVolumeCount--
|
|
keepDataNodesSorted(allLocations)
|
|
break
|
|
}
|
|
}
|
|
if !foundNewLocation {
|
|
fmt.Fprintf(writer, "failed to place volume %d replica as %s, existing:%+v\n", volumeInfo.Id, replicaPlacement, locations)
|
|
}
|
|
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func keepDataNodesSorted(dataNodes []location) {
|
|
sort.Slice(dataNodes, func(i, j int) bool {
|
|
return dataNodes[i].dataNode.FreeVolumeCount > dataNodes[j].dataNode.FreeVolumeCount
|
|
})
|
|
}
|
|
|
|
/*
|
|
if on an existing data node {
|
|
return false
|
|
}
|
|
if different from existing dcs {
|
|
if lack on different dcs {
|
|
return true
|
|
}else{
|
|
return false
|
|
}
|
|
}
|
|
if not on primary dc {
|
|
return false
|
|
}
|
|
if different from existing racks {
|
|
if lack on different racks {
|
|
return true
|
|
}else{
|
|
return false
|
|
}
|
|
}
|
|
if not on primary rack {
|
|
return false
|
|
}
|
|
if lacks on same rack {
|
|
return true
|
|
} else {
|
|
return false
|
|
}
|
|
*/
|
|
func satisfyReplicaPlacement(replicaPlacement *super_block.ReplicaPlacement, existingLocations []location, possibleLocation location) bool {
|
|
|
|
existingDataNodes := make(map[string]int)
|
|
for _, loc := range existingLocations {
|
|
existingDataNodes[loc.String()] += 1
|
|
}
|
|
sameDataNodeCount := existingDataNodes[possibleLocation.String()]
|
|
// avoid duplicated volume on the same data node
|
|
if sameDataNodeCount > 0 {
|
|
return false
|
|
}
|
|
|
|
existingDataCenters := make(map[string]int)
|
|
for _, loc := range existingLocations {
|
|
existingDataCenters[loc.DataCenter()] += 1
|
|
}
|
|
primaryDataCenters, _ := findTopKeys(existingDataCenters)
|
|
|
|
// ensure data center count is within limit
|
|
if _, found := existingDataCenters[possibleLocation.DataCenter()]; !found {
|
|
// different from existing dcs
|
|
if len(existingDataCenters) < replicaPlacement.DiffDataCenterCount+1 {
|
|
// lack on different dcs
|
|
return true
|
|
} else {
|
|
// adding this would go over the different dcs limit
|
|
return false
|
|
}
|
|
}
|
|
// now this is same as one of the existing data center
|
|
if !isAmong(possibleLocation.DataCenter(), primaryDataCenters) {
|
|
// not on one of the primary dcs
|
|
return false
|
|
}
|
|
|
|
// now this is one of the primary dcs
|
|
existingRacks := make(map[string]int)
|
|
for _, loc := range existingLocations {
|
|
if loc.DataCenter() != possibleLocation.DataCenter() {
|
|
continue
|
|
}
|
|
existingRacks[loc.Rack()] += 1
|
|
}
|
|
primaryRacks, _ := findTopKeys(existingRacks)
|
|
sameRackCount := existingRacks[possibleLocation.Rack()]
|
|
|
|
// ensure rack count is within limit
|
|
if _, found := existingRacks[possibleLocation.Rack()]; !found {
|
|
// different from existing racks
|
|
if len(existingRacks) < replicaPlacement.DiffRackCount+1 {
|
|
// lack on different racks
|
|
return true
|
|
} else {
|
|
// adding this would go over the different racks limit
|
|
return false
|
|
}
|
|
}
|
|
// now this is same as one of the existing racks
|
|
if !isAmong(possibleLocation.Rack(), primaryRacks) {
|
|
// not on the primary rack
|
|
return false
|
|
}
|
|
|
|
// now this is on the primary rack
|
|
|
|
// different from existing data nodes
|
|
if sameRackCount < replicaPlacement.SameRackCount+1 {
|
|
// lack on same rack
|
|
return true
|
|
} else {
|
|
// adding this would go over the same data node limit
|
|
return false
|
|
}
|
|
|
|
}
|
|
|
|
func findTopKeys(m map[string]int) (topKeys []string, max int) {
|
|
for k, c := range m {
|
|
if max < c {
|
|
topKeys = topKeys[:0]
|
|
topKeys = append(topKeys, k)
|
|
max = c
|
|
} else if max == c {
|
|
topKeys = append(topKeys, k)
|
|
}
|
|
}
|
|
return
|
|
}
|
|
|
|
func isAmong(key string, keys []string) bool {
|
|
for _, k := range keys {
|
|
if k == key {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
type location struct {
|
|
dc string
|
|
rack string
|
|
dataNode *master_pb.DataNodeInfo
|
|
}
|
|
|
|
func newLocation(dc, rack string, dataNode *master_pb.DataNodeInfo) location {
|
|
return location{
|
|
dc: dc,
|
|
rack: rack,
|
|
dataNode: dataNode,
|
|
}
|
|
}
|
|
|
|
func (l location) String() string {
|
|
return fmt.Sprintf("%s %s %s", l.dc, l.rack, l.dataNode.Id)
|
|
}
|
|
|
|
func (l location) Rack() string {
|
|
return fmt.Sprintf("%s %s", l.dc, l.rack)
|
|
}
|
|
|
|
func (l location) DataCenter() string {
|
|
return l.dc
|
|
}
|