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package shell
import ( "flag" "fmt" "io" "os"
"github.com/seaweedfs/seaweedfs/weed/pb/master_pb" "github.com/seaweedfs/seaweedfs/weed/storage/erasure_coding" "github.com/seaweedfs/seaweedfs/weed/storage/needle" "github.com/seaweedfs/seaweedfs/weed/storage/super_block" "github.com/seaweedfs/seaweedfs/weed/storage/types" "golang.org/x/exp/slices" )
func init() { Commands = append(Commands, &commandVolumeServerEvacuate{}) }
type commandVolumeServerEvacuate struct { topologyInfo *master_pb.TopologyInfo targetServer *string volumeRack *string }
func (c *commandVolumeServerEvacuate) Name() string { return "volumeServer.evacuate" }
func (c *commandVolumeServerEvacuate) Help() string { return `move out all data on a volume server
volumeServer.evacuate -node <host:port>
This command moves all data away from the volume server. The volumes on the volume servers will be redistributed.
Usually this is used to prepare to shutdown or upgrade the volume server.
Sometimes a volume can not be moved because there are no good destination to meet the replication requirement. E.g. a volume replication 001 in a cluster with 2 volume servers can not be moved. You can use "-skipNonMoveable" to move the rest volumes.
` }
func (c *commandVolumeServerEvacuate) HasTag(CommandTag) bool { return false }
func (c *commandVolumeServerEvacuate) Do(args []string, commandEnv *CommandEnv, writer io.Writer) (err error) {
vsEvacuateCommand := flag.NewFlagSet(c.Name(), flag.ContinueOnError) volumeServer := vsEvacuateCommand.String("node", "", "<host>:<port> of the volume server") c.volumeRack = vsEvacuateCommand.String("rack", "", "source rack for the volume servers") c.targetServer = vsEvacuateCommand.String("target", "", "<host>:<port> of target volume") skipNonMoveable := vsEvacuateCommand.Bool("skipNonMoveable", false, "skip volumes that can not be moved") applyChange := vsEvacuateCommand.Bool("force", false, "actually apply the changes") retryCount := vsEvacuateCommand.Int("retry", 0, "how many times to retry") if err = vsEvacuateCommand.Parse(args); err != nil { return nil } infoAboutSimulationMode(writer, *applyChange, "-force")
if err = commandEnv.confirmIsLocked(args); err != nil && *applyChange { return }
if *volumeServer == "" && *c.volumeRack == "" { return fmt.Errorf("need to specify volume server by -node=<host>:<port> or source rack") }
for i := 0; i < *retryCount+1; i++ { if err = c.volumeServerEvacuate(commandEnv, *volumeServer, *skipNonMoveable, *applyChange, writer); err == nil { return nil } }
return
}
func (c *commandVolumeServerEvacuate) volumeServerEvacuate(commandEnv *CommandEnv, volumeServer string, skipNonMoveable, applyChange bool, writer io.Writer) (err error) { // 1. confirm the volume server is part of the cluster
// 2. collect all other volume servers, sort by empty slots
// 3. move to any other volume server as long as it satisfy the replication requirements
// list all the volumes
// collect topology information
c.topologyInfo, _, err = collectTopologyInfo(commandEnv, 0) if err != nil { return err } defer func() { c.topologyInfo = nil }()
if err := c.evacuateNormalVolumes(commandEnv, volumeServer, skipNonMoveable, applyChange, writer); err != nil { return err }
if err := c.evacuateEcVolumes(commandEnv, volumeServer, skipNonMoveable, applyChange, writer); err != nil { return err }
return nil }
func (c *commandVolumeServerEvacuate) evacuateNormalVolumes(commandEnv *CommandEnv, volumeServer string, skipNonMoveable, applyChange bool, writer io.Writer) error { // find this volume server
volumeServers := collectVolumeServersByDc(c.topologyInfo, "") thisNodes, otherNodes := c.nodesOtherThan(volumeServers, volumeServer) if len(thisNodes) == 0 { return fmt.Errorf("%s is not found in this cluster", volumeServer) }
// move away normal volumes
for _, thisNode := range thisNodes { for _, diskInfo := range thisNode.info.DiskInfos { if applyChange { if topologyInfo, _, err := collectTopologyInfo(commandEnv, 0); err != nil { fmt.Fprintf(writer, "update topologyInfo %v", err) } else { _, otherNodesNew := c.nodesOtherThan( collectVolumeServersByDc(topologyInfo, ""), volumeServer) if len(otherNodesNew) > 0 { otherNodes = otherNodesNew c.topologyInfo = topologyInfo fmt.Fprintf(writer, "topologyInfo updated %v\n", len(otherNodes)) } } } volumeReplicas, _ := collectVolumeReplicaLocations(c.topologyInfo) for _, vol := range diskInfo.VolumeInfos { hasMoved, err := moveAwayOneNormalVolume(commandEnv, volumeReplicas, vol, thisNode, otherNodes, applyChange) if err != nil { fmt.Fprintf(writer, "move away volume %d from %s: %v\n", vol.Id, volumeServer, err) } if !hasMoved { if skipNonMoveable { replicaPlacement, _ := super_block.NewReplicaPlacementFromByte(byte(vol.ReplicaPlacement)) fmt.Fprintf(writer, "skipping non moveable volume %d replication:%s\n", vol.Id, replicaPlacement.String()) } else { return fmt.Errorf("failed to move volume %d from %s", vol.Id, volumeServer) } } } } } return nil }
func (c *commandVolumeServerEvacuate) evacuateEcVolumes(commandEnv *CommandEnv, volumeServer string, skipNonMoveable, applyChange bool, writer io.Writer) error { // find this ec volume server
ecNodes, _ := collectEcVolumeServersByDc(c.topologyInfo, "") thisNodes, otherNodes := c.ecNodesOtherThan(ecNodes, volumeServer) if len(thisNodes) == 0 { return fmt.Errorf("%s is not found in this cluster\n", volumeServer) }
// move away ec volumes
for _, thisNode := range thisNodes { for _, diskInfo := range thisNode.info.DiskInfos { for _, ecShardInfo := range diskInfo.EcShardInfos { hasMoved, err := c.moveAwayOneEcVolume(commandEnv, ecShardInfo, thisNode, otherNodes, applyChange) if err != nil { fmt.Fprintf(writer, "move away volume %d from %s: %v", ecShardInfo.Id, volumeServer, err) } if !hasMoved { if skipNonMoveable { fmt.Fprintf(writer, "failed to move away ec volume %d from %s\n", ecShardInfo.Id, volumeServer) } else { return fmt.Errorf("failed to move away ec volume %d from %s", ecShardInfo.Id, volumeServer) } } } } } return nil }
func (c *commandVolumeServerEvacuate) moveAwayOneEcVolume(commandEnv *CommandEnv, ecShardInfo *master_pb.VolumeEcShardInformationMessage, thisNode *EcNode, otherNodes []*EcNode, applyChange bool) (hasMoved bool, err error) {
for _, shardId := range erasure_coding.ShardBits(ecShardInfo.EcIndexBits).ShardIds() { slices.SortFunc(otherNodes, func(a, b *EcNode) int { return a.localShardIdCount(ecShardInfo.Id) - b.localShardIdCount(ecShardInfo.Id) }) for i := 0; i < len(otherNodes); i++ { emptyNode := otherNodes[i] collectionPrefix := "" if ecShardInfo.Collection != "" { collectionPrefix = ecShardInfo.Collection + "_" } fmt.Fprintf(os.Stdout, "moving ec volume %s%d.%d %s => %s\n", collectionPrefix, ecShardInfo.Id, shardId, thisNode.info.Id, emptyNode.info.Id) err = moveMountedShardToEcNode(commandEnv, thisNode, ecShardInfo.Collection, needle.VolumeId(ecShardInfo.Id), shardId, emptyNode, applyChange) if err != nil { return } else { hasMoved = true break } } if !hasMoved { return } }
return }
func moveAwayOneNormalVolume(commandEnv *CommandEnv, volumeReplicas map[uint32][]*VolumeReplica, vol *master_pb.VolumeInformationMessage, thisNode *Node, otherNodes []*Node, applyChange bool) (hasMoved bool, err error) { freeVolumeCountfn := capacityByFreeVolumeCount(types.ToDiskType(vol.DiskType)) maxVolumeCountFn := capacityByMaxVolumeCount(types.ToDiskType(vol.DiskType)) for _, n := range otherNodes { n.selectVolumes(func(v *master_pb.VolumeInformationMessage) bool { return v.DiskType == vol.DiskType }) } // most empty one is in the front
slices.SortFunc(otherNodes, func(a, b *Node) int { return int(a.localVolumeRatio(maxVolumeCountFn) - b.localVolumeRatio(maxVolumeCountFn)) }) for i := 0; i < len(otherNodes); i++ { emptyNode := otherNodes[i] if freeVolumeCountfn(emptyNode.info) <= 0 { continue } hasMoved, err = maybeMoveOneVolume(commandEnv, volumeReplicas, thisNode, vol, emptyNode, applyChange) if err != nil { return } if hasMoved { break } } return }
func (c *commandVolumeServerEvacuate) nodesOtherThan(volumeServers []*Node, thisServer string) (thisNodes []*Node, otherNodes []*Node) { for _, node := range volumeServers { if node.info.Id == thisServer || (*c.volumeRack != "" && node.rack == *c.volumeRack) { thisNodes = append(thisNodes, node) continue } if *c.volumeRack != "" && *c.volumeRack == node.rack { continue } if *c.targetServer != "" && *c.targetServer != node.info.Id { continue } otherNodes = append(otherNodes, node) } return }
func (c *commandVolumeServerEvacuate) ecNodesOtherThan(volumeServers []*EcNode, thisServer string) (thisNodes []*EcNode, otherNodes []*EcNode) { for _, node := range volumeServers { if node.info.Id == thisServer || (*c.volumeRack != "" && string(node.rack) == *c.volumeRack) { thisNodes = append(thisNodes, node) continue } if *c.volumeRack != "" && *c.volumeRack == string(node.rack) { continue } if *c.targetServer != "" && *c.targetServer != node.info.Id { continue } otherNodes = append(otherNodes, node) } return }
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