mirror of
https://github.com/seaweedfs/seaweedfs.git
synced 2024-01-19 02:48:24 +00:00
304 lines
9.5 KiB
Go
304 lines
9.5 KiB
Go
package shell
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import (
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"context"
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"flag"
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"fmt"
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"io"
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"sort"
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"sync"
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"github.com/chrislusf/seaweedfs/weed/glog"
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"github.com/chrislusf/seaweedfs/weed/operation"
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"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
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"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
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"github.com/chrislusf/seaweedfs/weed/storage/erasure_coding"
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"github.com/chrislusf/seaweedfs/weed/storage/needle"
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"github.com/chrislusf/seaweedfs/weed/wdclient"
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"google.golang.org/grpc"
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)
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func init() {
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commands = append(commands, &commandEcEncode{})
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}
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type commandEcEncode struct {
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}
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func (c *commandEcEncode) Name() string {
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return "ec.encode"
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}
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func (c *commandEcEncode) Help() string {
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return `apply erasure coding to a volume
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This command will:
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1. freeze one volume
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2. apply erasure coding to the volume
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3. move the encoded shards to multiple volume servers
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The erasure coding is 10.4. So ideally you have more than 14 volume servers, and you can afford
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to lose 4 volume servers.
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If the number of volumes are not high, the worst case is that you only have 4 volume servers,
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and the shards are spread as 4,4,3,3, respectively. You can afford to lose one volume server.
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If you only have less than 4 volume servers, with erasure coding, at least you can afford to
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have 4 corrupted shard files.
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`
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}
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func (c *commandEcEncode) Do(args []string, commandEnv *commandEnv, writer io.Writer) (err error) {
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encodeCommand := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
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volumeId := encodeCommand.Int("volumeId", 0, "the volume id")
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collection := encodeCommand.String("collection", "", "the collection name")
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if err = encodeCommand.Parse(args); err != nil {
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return nil
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}
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ctx := context.Background()
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// find volume location
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locations := commandEnv.masterClient.GetLocations(uint32(*volumeId))
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if len(locations) == 0 {
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return fmt.Errorf("volume %d not found", *volumeId)
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}
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// generate ec shards
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err = generateEcShards(ctx, commandEnv.option.GrpcDialOption, needle.VolumeId(*volumeId), *collection, locations[0].Url)
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if err != nil {
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return fmt.Errorf("generate ec shards for volume %d on %s: %v", *volumeId, locations[0].Url, err)
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}
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// balance the ec shards to current cluster
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err = balanceEcShards(ctx, commandEnv, needle.VolumeId(*volumeId), *collection, locations)
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if err != nil {
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return fmt.Errorf("balance ec shards for volume %d on %s: %v", *volumeId, locations[0].Url, err)
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}
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return err
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}
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func generateEcShards(ctx context.Context, grpcDialOption grpc.DialOption, volumeId needle.VolumeId, collection string, sourceVolumeServer string) error {
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err := operation.WithVolumeServerClient(sourceVolumeServer, grpcDialOption, func(volumeServerClient volume_server_pb.VolumeServerClient) error {
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_, genErr := volumeServerClient.VolumeEcShardsGenerate(ctx, &volume_server_pb.VolumeEcShardsGenerateRequest{
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VolumeId: uint32(volumeId),
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Collection: collection,
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})
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return genErr
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})
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return err
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}
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func balanceEcShards(ctx context.Context, commandEnv *commandEnv, volumeId needle.VolumeId, collection string, existingLocations []wdclient.Location) (err error) {
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// list all possible locations
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var resp *master_pb.VolumeListResponse
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err = commandEnv.masterClient.WithClient(ctx, func(client master_pb.SeaweedClient) error {
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resp, err = client.VolumeList(ctx, &master_pb.VolumeListRequest{})
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return err
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})
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if err != nil {
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return err
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}
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// find out all volume servers with one volume slot left.
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var allDataNodes []*master_pb.DataNodeInfo
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var totalFreeEcSlots uint32
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eachDataNode(resp.TopologyInfo, func(dn *master_pb.DataNodeInfo) {
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if freeEcSlots := countFreeShardSlots(dn); freeEcSlots > 0 {
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allDataNodes = append(allDataNodes, dn)
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totalFreeEcSlots += freeEcSlots
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}
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})
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if totalFreeEcSlots < erasure_coding.TotalShardsCount {
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return fmt.Errorf("not enough free ec shard slots. only %d left", totalFreeEcSlots)
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}
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sort.Slice(allDataNodes, func(i, j int) bool {
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return countFreeShardSlots(allDataNodes[j]) < countFreeShardSlots(allDataNodes[i])
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})
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if len(allDataNodes) > erasure_coding.TotalShardsCount {
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allDataNodes = allDataNodes[:erasure_coding.TotalShardsCount]
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}
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// calculate how many shards to allocate for these servers
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allocated := balancedEcDistribution(allDataNodes)
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// ask the data nodes to copy from the source volume server
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copiedShardIds, err := parallelCopyEcShardsFromSource(ctx, commandEnv.option.GrpcDialOption, allDataNodes, allocated, volumeId, collection, existingLocations[0])
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if err != nil {
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return nil
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}
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// ask the source volume server to clean up copied ec shards
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err = sourceServerDeleteEcShards(ctx, commandEnv.option.GrpcDialOption, volumeId, existingLocations[0], copiedShardIds)
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if err != nil {
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return fmt.Errorf("sourceServerDeleteEcShards %s %d.%v: %v", existingLocations[0], volumeId, copiedShardIds, err)
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}
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// ask the source volume server to delete the original volume
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for _, location := range existingLocations {
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err = deleteVolume(ctx, commandEnv.option.GrpcDialOption, volumeId, location.Url)
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if err != nil {
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return fmt.Errorf("deleteVolume %s volume %d: %v", location.Url, volumeId, err)
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}
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}
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return err
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}
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func parallelCopyEcShardsFromSource(ctx context.Context, grpcDialOption grpc.DialOption,
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targetServers []*master_pb.DataNodeInfo, allocated []uint32,
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volumeId needle.VolumeId, collection string, existingLocation wdclient.Location) (actuallyCopied []uint32, err error) {
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// parallelize
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shardIdChan := make(chan []uint32, len(targetServers))
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var wg sync.WaitGroup
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startFromShardId := uint32(0)
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for i, server := range targetServers {
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if allocated[i] <= 0 {
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continue
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}
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wg.Add(1)
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go func(server *master_pb.DataNodeInfo, startFromShardId uint32, shardCount uint32) {
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defer wg.Done()
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copiedShardIds, copyErr := oneServerCopyEcShardsFromSource(ctx, grpcDialOption, server,
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startFromShardId, shardCount, volumeId, collection, existingLocation)
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if copyErr != nil {
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err = copyErr
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} else {
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shardIdChan <- copiedShardIds
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}
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}(server, startFromShardId, allocated[i])
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startFromShardId += allocated[i]
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}
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wg.Wait()
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close(shardIdChan)
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if err != nil {
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return nil, err
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}
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for shardIds := range shardIdChan {
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actuallyCopied = append(actuallyCopied, shardIds...)
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}
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return
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}
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func oneServerCopyEcShardsFromSource(ctx context.Context, grpcDialOption grpc.DialOption,
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targetServer *master_pb.DataNodeInfo, startFromShardId uint32, shardCount uint32,
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volumeId needle.VolumeId, collection string, existingLocation wdclient.Location) (copiedShardIds []uint32, err error) {
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var shardIdsToCopy []uint32
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for shardId := startFromShardId; shardId < startFromShardId+shardCount; shardId++ {
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fmt.Printf("allocate %d.%d %s => %s\n", volumeId, shardId, existingLocation.Url, targetServer.Id)
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shardIdsToCopy = append(shardIdsToCopy, shardId)
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}
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err = operation.WithVolumeServerClient(targetServer.Id, grpcDialOption, func(volumeServerClient volume_server_pb.VolumeServerClient) error {
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if targetServer.Id != existingLocation.Url {
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_, copyErr := volumeServerClient.VolumeEcShardsCopy(ctx, &volume_server_pb.VolumeEcShardsCopyRequest{
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VolumeId: uint32(volumeId),
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Collection: collection,
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ShardIds: shardIdsToCopy,
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SourceDataNode: existingLocation.Url,
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})
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if copyErr != nil {
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return copyErr
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}
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}
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_, mountErr := volumeServerClient.VolumeEcShardsMount(ctx, &volume_server_pb.VolumeEcShardsMountRequest{
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VolumeId: uint32(volumeId),
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Collection: collection,
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ShardIds: shardIdsToCopy,
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})
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if mountErr != nil {
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return mountErr
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}
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if targetServer.Id != existingLocation.Url {
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copiedShardIds = shardIdsToCopy
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glog.V(0).Infof("%s ec volume %d deletes shards %+v", existingLocation.Url, volumeId, copiedShardIds)
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}
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return nil
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})
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if err != nil {
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return
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}
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return
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}
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func sourceServerDeleteEcShards(ctx context.Context, grpcDialOption grpc.DialOption,
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volumeId needle.VolumeId, sourceLocation wdclient.Location, toBeDeletedShardIds []uint32) error {
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shouldDeleteEcx := len(toBeDeletedShardIds) == erasure_coding.TotalShardsCount
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return operation.WithVolumeServerClient(sourceLocation.Url, grpcDialOption, func(volumeServerClient volume_server_pb.VolumeServerClient) error {
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_, deleteErr := volumeServerClient.VolumeEcShardsDelete(ctx, &volume_server_pb.VolumeEcShardsDeleteRequest{
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VolumeId: uint32(volumeId),
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ShardIds: toBeDeletedShardIds,
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ShouldDeleteEcx: shouldDeleteEcx,
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})
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return deleteErr
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})
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}
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func balancedEcDistribution(servers []*master_pb.DataNodeInfo) (allocated []uint32) {
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freeSlots := make([]uint32, len(servers))
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allocated = make([]uint32, len(servers))
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for i, server := range servers {
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freeSlots[i] = countFreeShardSlots(server)
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}
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allocatedCount := 0
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for allocatedCount < erasure_coding.TotalShardsCount {
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for i, _ := range servers {
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if freeSlots[i]-allocated[i] > 0 {
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allocated[i] += 1
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allocatedCount += 1
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}
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if allocatedCount >= erasure_coding.TotalShardsCount {
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break
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}
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}
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}
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return allocated
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}
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func eachDataNode(topo *master_pb.TopologyInfo, fn func(*master_pb.DataNodeInfo)) {
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for _, dc := range topo.DataCenterInfos {
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for _, rack := range dc.RackInfos {
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for _, dn := range rack.DataNodeInfos {
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fn(dn)
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}
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}
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}
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}
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func countShards(ecShardInfos []*master_pb.VolumeEcShardInformationMessage) (count uint32) {
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for _, ecShardInfo := range ecShardInfos {
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shardBits := erasure_coding.ShardBits(ecShardInfo.EcIndexBits)
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count += uint32(shardBits.ShardIdCount())
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}
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return
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}
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func countFreeShardSlots(dn *master_pb.DataNodeInfo) (count uint32) {
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return uint32(dn.FreeVolumeCount)*10 - countShards(dn.EcShardInfos)
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}
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