seaweedfs/weed/shell/command_volume_fix_replication.go

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package shell
import (
"context"
"flag"
"fmt"
"github.com/chrislusf/seaweedfs/weed/storage/needle"
"io"
"path/filepath"
"sort"
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"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 {
collectionPattern *string
}
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 finds all over-replicated volumes. If found, it will purge the oldest copies and stop.
This command also finds all under-replicated volumes, and finds volume servers with free slots.
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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 deleting or copying the volume files and mount the volume
volume.fix.replication -collectionPattern=important* # fix any collections with prefix "important"
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Note:
* each time this will only add back one replica for each volume id that is under replicated.
If there are multiple replicas are missing, e.g. replica count is > 2, you may need to run this multiple times.
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* do not run this too quickly within seconds, since the new volume replica may take a few seconds
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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
}
volFixReplicationCommand := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
c.collectionPattern = volFixReplicationCommand.String("collectionPattern", "", "match with wildcard characters '*' and '?'")
skipChange := volFixReplicationCommand.Bool("n", false, "skip the changes")
if err = volFixReplicationCommand.Parse(args); err != nil {
return nil
}
takeAction := !*skipChange
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
volumeReplicas, allLocations := collectVolumeReplicaLocations(resp)
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if len(allLocations) == 0 {
return fmt.Errorf("no data nodes at all")
}
// find all under replicated volumes
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var underReplicatedVolumeIds, overReplicatedVolumeIds []uint32
for vid, replicas := range volumeReplicas {
replica := replicas[0]
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replicaPlacement, _ := super_block.NewReplicaPlacementFromByte(byte(replica.info.ReplicaPlacement))
if replicaPlacement.GetCopyCount() > len(replicas) {
underReplicatedVolumeIds = append(underReplicatedVolumeIds, vid)
} else if replicaPlacement.GetCopyCount() < len(replicas) {
overReplicatedVolumeIds = append(overReplicatedVolumeIds, vid)
fmt.Fprintf(writer, "volume %d replication %s, but over replicated %+d\n", replica.info.Id, replicaPlacement, len(replicas))
}
}
if len(overReplicatedVolumeIds) > 0 {
return c.fixOverReplicatedVolumes(commandEnv, writer, takeAction, overReplicatedVolumeIds, volumeReplicas, allLocations)
}
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if len(underReplicatedVolumeIds) == 0 {
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return nil
}
// find the most under populated data nodes
keepDataNodesSorted(allLocations)
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return c.fixUnderReplicatedVolumes(commandEnv, writer, takeAction, underReplicatedVolumeIds, volumeReplicas, allLocations)
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}
func collectVolumeReplicaLocations(resp *master_pb.VolumeListResponse) (map[uint32][]*VolumeReplica, []location) {
volumeReplicas := make(map[uint32][]*VolumeReplica)
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 {
volumeReplicas[v.Id] = append(volumeReplicas[v.Id], &VolumeReplica{
location: &loc,
info: v,
})
}
allLocations = append(allLocations, loc)
})
return volumeReplicas, allLocations
}
func (c *commandVolumeFixReplication) fixOverReplicatedVolumes(commandEnv *CommandEnv, writer io.Writer, takeAction bool, overReplicatedVolumeIds []uint32, volumeReplicas map[uint32][]*VolumeReplica, allLocations []location) error {
for _, vid := range overReplicatedVolumeIds {
replicas := volumeReplicas[vid]
replicaPlacement, _ := super_block.NewReplicaPlacementFromByte(byte(replicas[0].info.ReplicaPlacement))
replica := pickOneReplicaToDelete(replicas, replicaPlacement)
// check collection name pattern
if *c.collectionPattern != "" {
matched, err := filepath.Match(*c.collectionPattern, replica.info.Collection)
if err != nil {
return fmt.Errorf("match pattern %s with collection %s: %v", *c.collectionPattern, replica.info.Collection, err)
}
if !matched {
break
}
}
fmt.Fprintf(writer, "deleting volume %d from %s ...\n", replica.info.Id, replica.location.dataNode.Id)
if !takeAction {
break
}
if err := deleteVolume(commandEnv.option.GrpcDialOption, needle.VolumeId(replica.info.Id), replica.location.dataNode.Id); err != nil {
return fmt.Errorf("deleting volume %d from %s : %v", replica.info.Id, replica.location.dataNode.Id, err)
}
}
return nil
}
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func (c *commandVolumeFixReplication) fixUnderReplicatedVolumes(commandEnv *CommandEnv, writer io.Writer, takeAction bool, underReplicatedVolumeIds []uint32, volumeReplicas map[uint32][]*VolumeReplica, allLocations []location) error {
for _, vid := range underReplicatedVolumeIds {
replicas := volumeReplicas[vid]
replica := pickOneReplicaToCopyFrom(replicas)
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replicaPlacement, _ := super_block.NewReplicaPlacementFromByte(byte(replica.info.ReplicaPlacement))
foundNewLocation := false
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hasSkippedCollection := false
for _, dst := range allLocations {
// check whether data nodes satisfy the constraints
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if dst.dataNode.FreeVolumeCount > 0 && satisfyReplicaPlacement(replicaPlacement, replicas, dst) {
// check collection name pattern
if *c.collectionPattern != "" {
matched, err := filepath.Match(*c.collectionPattern, replica.info.Collection)
if err != nil {
return fmt.Errorf("match pattern %s with collection %s: %v", *c.collectionPattern, replica.info.Collection, err)
}
if !matched {
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hasSkippedCollection = true
break
}
}
// ask the volume server to replicate the volume
foundNewLocation = true
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fmt.Fprintf(writer, "replicating volume %d %s from %s to dataNode %s ...\n", replica.info.Id, replicaPlacement, replica.location.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{
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VolumeId: replica.info.Id,
SourceDataNode: replica.location.dataNode.Id,
})
if replicateErr != nil {
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return fmt.Errorf("copying from %s => %s : %v", replica.location.dataNode.Id, dst.dataNode.Id, replicateErr)
}
return nil
})
if err != nil {
return err
}
// adjust free volume count
dst.dataNode.FreeVolumeCount--
keepDataNodesSorted(allLocations)
break
}
}
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if !foundNewLocation && !hasSkippedCollection {
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fmt.Fprintf(writer, "failed to place volume %d replica as %s, existing:%+v\n", replica.info.Id, replicaPlacement, len(replicas))
}
}
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
}
*/
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func satisfyReplicaPlacement(replicaPlacement *super_block.ReplicaPlacement, replicas []*VolumeReplica, possibleLocation location) bool {
existingDataCenters, _, existingDataNodes := countReplicas(replicas)
if _, found := existingDataNodes[possibleLocation.String()]; found {
// avoid duplicated volume on the same data node
return false
}
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
primaryDcRacks := make(map[string]int)
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for _, replica := range replicas {
if replica.location.DataCenter() != possibleLocation.DataCenter() {
continue
}
primaryDcRacks[replica.location.Rack()] += 1
}
primaryRacks, _ := findTopKeys(primaryDcRacks)
sameRackCount := primaryDcRacks[possibleLocation.Rack()]
// ensure rack count is within limit
if _, found := primaryDcRacks[possibleLocation.Rack()]; !found {
// different from existing racks
if len(primaryDcRacks) < 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
}
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type VolumeReplica struct {
location *location
info *master_pb.VolumeInformationMessage
}
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
}
func pickOneReplicaToCopyFrom(replicas []*VolumeReplica) *VolumeReplica {
mostRecent := replicas[0]
for _, replica := range replicas {
if replica.info.ModifiedAtSecond > mostRecent.info.ModifiedAtSecond {
mostRecent = replica
}
}
return mostRecent
}
func countReplicas(replicas []*VolumeReplica) (diffDc, diffRack, diffNode map[string]int) {
diffDc = make(map[string]int)
diffRack = make(map[string]int)
diffNode = make(map[string]int)
for _, replica := range replicas {
diffDc[replica.location.DataCenter()] += 1
diffRack[replica.location.Rack()] += 1
diffNode[replica.location.String()] += 1
}
return
}
func pickOneReplicaToDelete(replicas []*VolumeReplica, replicaPlacement *super_block.ReplicaPlacement) *VolumeReplica {
sort.Slice(replicas, func(i, j int) bool {
a, b := replicas[i], replicas[j]
if a.info.CompactRevision != b.info.CompactRevision {
return a.info.CompactRevision < b.info.CompactRevision
}
if a.info.ModifiedAtSecond != b.info.ModifiedAtSecond {
return a.info.ModifiedAtSecond < b.info.ModifiedAtSecond
}
if a.info.Size != b.info.Size {
return a.info.Size < b.info.Size
}
return false
})
return replicas[0]
}