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package shell
import ( "context" "fmt" "math" "sort"
"github.com/chrislusf/seaweedfs/weed/glog" "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/erasure_coding" "github.com/chrislusf/seaweedfs/weed/storage/needle" "google.golang.org/grpc" )
func moveMountedShardToEcNode(ctx context.Context, commandEnv *CommandEnv, existingLocation *EcNode, collection string, vid needle.VolumeId, shardId erasure_coding.ShardId, destinationEcNode *EcNode, applyBalancing bool) (err error) {
copiedShardIds := []uint32{uint32(shardId)}
if applyBalancing {
// ask destination node to copy shard and the ecx file from source node, and mount it
copiedShardIds, err = oneServerCopyAndMountEcShardsFromSource(ctx, commandEnv.option.GrpcDialOption, destinationEcNode, uint32(shardId), 1, vid, collection, existingLocation.info.Id) if err != nil { return err }
// unmount the to be deleted shards
err = unmountEcShards(ctx, commandEnv.option.GrpcDialOption, vid, existingLocation.info.Id, copiedShardIds) if err != nil { return err }
// ask source node to delete the shard, and maybe the ecx file
err = sourceServerDeleteEcShards(ctx, commandEnv.option.GrpcDialOption, collection, vid, existingLocation.info.Id, copiedShardIds) if err != nil { return err }
fmt.Printf("moved ec shard %d.%d %s => %s\n", vid, shardId, existingLocation.info.Id, destinationEcNode.info.Id)
}
destinationEcNode.addEcVolumeShards(vid, collection, copiedShardIds) existingLocation.deleteEcVolumeShards(vid, copiedShardIds)
return nil
}
func oneServerCopyAndMountEcShardsFromSource(ctx context.Context, grpcDialOption grpc.DialOption, targetServer *EcNode, startFromShardId uint32, shardCount int, volumeId needle.VolumeId, collection string, existingLocation string) (copiedShardIds []uint32, err error) {
var shardIdsToCopy []uint32 for shardId := startFromShardId; shardId < startFromShardId+uint32(shardCount); shardId++ { shardIdsToCopy = append(shardIdsToCopy, shardId) } fmt.Printf("allocate %d.%v %s => %s\n", volumeId, shardIdsToCopy, existingLocation, targetServer.info.Id)
err = operation.WithVolumeServerClient(targetServer.info.Id, grpcDialOption, func(volumeServerClient volume_server_pb.VolumeServerClient) error {
if targetServer.info.Id != existingLocation {
fmt.Printf("copy %d.%v %s => %s\n", volumeId, shardIdsToCopy, existingLocation, targetServer.info.Id) _, copyErr := volumeServerClient.VolumeEcShardsCopy(ctx, &volume_server_pb.VolumeEcShardsCopyRequest{ VolumeId: uint32(volumeId), Collection: collection, ShardIds: shardIdsToCopy, CopyEcxFile: true, SourceDataNode: existingLocation, }) if copyErr != nil { return fmt.Errorf("copy %d.%v %s => %s : %v\n", volumeId, shardIdsToCopy, existingLocation, targetServer.info.Id, copyErr) } }
fmt.Printf("mount %d.%v on %s\n", volumeId, shardIdsToCopy, targetServer.info.Id) _, mountErr := volumeServerClient.VolumeEcShardsMount(ctx, &volume_server_pb.VolumeEcShardsMountRequest{ VolumeId: uint32(volumeId), Collection: collection, ShardIds: shardIdsToCopy, }) if mountErr != nil { return fmt.Errorf("mount %d.%v on %s : %v\n", volumeId, shardIdsToCopy, targetServer.info.Id, mountErr) }
if targetServer.info.Id != existingLocation { copiedShardIds = shardIdsToCopy glog.V(0).Infof("%s ec volume %d deletes shards %+v", existingLocation, volumeId, copiedShardIds) }
return nil })
if err != nil { return }
return }
func eachDataNode(topo *master_pb.TopologyInfo, fn func(dc string, rack RackId, dn *master_pb.DataNodeInfo)) { for _, dc := range topo.DataCenterInfos { for _, rack := range dc.RackInfos { for _, dn := range rack.DataNodeInfos { fn(dc.Id, RackId(rack.Id), dn) } } } }
func sortEcNodes(ecNodes []*EcNode) { sort.Slice(ecNodes, func(i, j int) bool { return ecNodes[i].freeEcSlot > ecNodes[j].freeEcSlot }) }
type CandidateEcNode struct { ecNode *EcNode shardCount int }
// if the index node changed the freeEcSlot, need to keep every EcNode still sorted
func ensureSortedEcNodes(data []*CandidateEcNode, index int, lessThan func(i, j int) bool) { for i := index - 1; i >= 0; i-- { if lessThan(i+1, i) { swap(data, i, i+1) } else { break } } for i := index + 1; i < len(data); i++ { if lessThan(i, i-1) { swap(data, i, i-1) } else { break } } }
func swap(data []*CandidateEcNode, i, j int) { t := data[i] data[i] = data[j] data[j] = t }
func countShards(ecShardInfos []*master_pb.VolumeEcShardInformationMessage) (count int) { for _, ecShardInfo := range ecShardInfos { shardBits := erasure_coding.ShardBits(ecShardInfo.EcIndexBits) count += shardBits.ShardIdCount() } return }
func countFreeShardSlots(dn *master_pb.DataNodeInfo) (count int) { return int(dn.FreeVolumeCount)*erasure_coding.DataShardsCount - countShards(dn.EcShardInfos) }
type RackId string type EcNodeId string
type EcNode struct { info *master_pb.DataNodeInfo dc string rack RackId freeEcSlot int }
type EcRack struct { ecNodes map[EcNodeId]*EcNode freeEcSlot int }
func collectEcNodes(ctx context.Context, commandEnv *CommandEnv, selectedDataCenter string) (ecNodes []*EcNode, totalFreeEcSlots int, err error) {
// list all possible locations
var resp *master_pb.VolumeListResponse err = commandEnv.MasterClient.WithClient(ctx, func(client master_pb.SeaweedClient) error { resp, err = client.VolumeList(ctx, &master_pb.VolumeListRequest{}) return err }) if err != nil { return nil, 0, err }
// find out all volume servers with one slot left.
eachDataNode(resp.TopologyInfo, func(dc string, rack RackId, dn *master_pb.DataNodeInfo) { if selectedDataCenter != "" && selectedDataCenter != dc { return } if freeEcSlots := countFreeShardSlots(dn); freeEcSlots > 0 { ecNodes = append(ecNodes, &EcNode{ info: dn, dc: dc, rack: rack, freeEcSlot: int(freeEcSlots), }) totalFreeEcSlots += freeEcSlots } })
sortEcNodes(ecNodes)
return }
func sourceServerDeleteEcShards(ctx context.Context, grpcDialOption grpc.DialOption, collection string, volumeId needle.VolumeId, sourceLocation string, toBeDeletedShardIds []uint32) error {
fmt.Printf("delete %d.%v from %s\n", volumeId, toBeDeletedShardIds, sourceLocation)
return operation.WithVolumeServerClient(sourceLocation, grpcDialOption, func(volumeServerClient volume_server_pb.VolumeServerClient) error { _, deleteErr := volumeServerClient.VolumeEcShardsDelete(ctx, &volume_server_pb.VolumeEcShardsDeleteRequest{ VolumeId: uint32(volumeId), Collection: collection, ShardIds: toBeDeletedShardIds, }) return deleteErr })
}
func unmountEcShards(ctx context.Context, grpcDialOption grpc.DialOption, volumeId needle.VolumeId, sourceLocation string, toBeUnmountedhardIds []uint32) error {
fmt.Printf("unmount %d.%v from %s\n", volumeId, toBeUnmountedhardIds, sourceLocation)
return operation.WithVolumeServerClient(sourceLocation, grpcDialOption, func(volumeServerClient volume_server_pb.VolumeServerClient) error { _, deleteErr := volumeServerClient.VolumeEcShardsUnmount(ctx, &volume_server_pb.VolumeEcShardsUnmountRequest{ VolumeId: uint32(volumeId), ShardIds: toBeUnmountedhardIds, }) return deleteErr }) }
func mountEcShards(ctx context.Context, grpcDialOption grpc.DialOption, collection string, volumeId needle.VolumeId, sourceLocation string, toBeMountedhardIds []uint32) error {
fmt.Printf("mount %d.%v on %s\n", volumeId, toBeMountedhardIds, sourceLocation)
return operation.WithVolumeServerClient(sourceLocation, grpcDialOption, func(volumeServerClient volume_server_pb.VolumeServerClient) error { _, mountErr := volumeServerClient.VolumeEcShardsMount(ctx, &volume_server_pb.VolumeEcShardsMountRequest{ VolumeId: uint32(volumeId), Collection: collection, ShardIds: toBeMountedhardIds, }) return mountErr }) }
func ceilDivide(total, n int) int { return int(math.Ceil(float64(total) / float64(n))) }
func findEcVolumeShards(ecNode *EcNode, vid needle.VolumeId) erasure_coding.ShardBits {
for _, shardInfo := range ecNode.info.EcShardInfos { if needle.VolumeId(shardInfo.Id) == vid { return erasure_coding.ShardBits(shardInfo.EcIndexBits) } }
return 0 }
func (ecNode *EcNode) addEcVolumeShards(vid needle.VolumeId, collection string, shardIds []uint32) *EcNode {
foundVolume := false for _, shardInfo := range ecNode.info.EcShardInfos { if needle.VolumeId(shardInfo.Id) == vid { oldShardBits := erasure_coding.ShardBits(shardInfo.EcIndexBits) newShardBits := oldShardBits for _, shardId := range shardIds { newShardBits = newShardBits.AddShardId(erasure_coding.ShardId(shardId)) } shardInfo.EcIndexBits = uint32(newShardBits) ecNode.freeEcSlot -= newShardBits.ShardIdCount() - oldShardBits.ShardIdCount() foundVolume = true break } }
if !foundVolume { var newShardBits erasure_coding.ShardBits for _, shardId := range shardIds { newShardBits = newShardBits.AddShardId(erasure_coding.ShardId(shardId)) } ecNode.info.EcShardInfos = append(ecNode.info.EcShardInfos, &master_pb.VolumeEcShardInformationMessage{ Id: uint32(vid), Collection: collection, EcIndexBits: uint32(newShardBits), }) ecNode.freeEcSlot -= len(shardIds) }
return ecNode }
func (ecNode *EcNode) deleteEcVolumeShards(vid needle.VolumeId, shardIds []uint32) *EcNode {
for _, shardInfo := range ecNode.info.EcShardInfos { if needle.VolumeId(shardInfo.Id) == vid { oldShardBits := erasure_coding.ShardBits(shardInfo.EcIndexBits) newShardBits := oldShardBits for _, shardId := range shardIds { newShardBits = newShardBits.RemoveShardId(erasure_coding.ShardId(shardId)) } shardInfo.EcIndexBits = uint32(newShardBits) ecNode.freeEcSlot -= newShardBits.ShardIdCount() - oldShardBits.ShardIdCount() } }
return ecNode }
func groupByCount(data []*EcNode, identifierFn func(*EcNode) (id string, count int)) map[string]int { countMap := make(map[string]int) for _, d := range data { id, count := identifierFn(d) countMap[id] += count } return countMap }
func groupBy(data []*EcNode, identifierFn func(*EcNode) (id string)) map[string][]*EcNode { groupMap := make(map[string][]*EcNode) for _, d := range data { id := identifierFn(d) groupMap[id] = append(groupMap[id], d) } return groupMap }
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