mirror of
https://github.com/seaweedfs/seaweedfs.git
synced 2024-11-25 03:29:10 +08:00
290 lines
8.9 KiB
Go
290 lines
8.9 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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"sync"
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"time"
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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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ec.encode [-collection=""] [-fullPercent=95] [-quietFor=1h]
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ec.encode [-collection=""] [-volumeId=<volume_id>]
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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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fullPercentage := encodeCommand.Float64("fullPercent", 95, "the volume reaches the percentage of max volume size")
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quietPeriod := encodeCommand.Duration("quietFor", time.Hour, "select volumes without no writes for this period")
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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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vid := needle.VolumeId(*volumeId)
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// volumeId is provided
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if vid != 0 {
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return doEcEncode(ctx, commandEnv, *collection, vid)
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}
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// apply to all volumes in the collection
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volumeIds, err := collectVolumeIdsForEcEncode(ctx, commandEnv, *collection, *fullPercentage, *quietPeriod)
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if err != nil {
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return err
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}
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fmt.Printf("ec encode volumes: %v\n", volumeIds)
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for _, vid := range volumeIds {
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if err = doEcEncode(ctx, commandEnv, *collection, vid); err != nil {
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return err
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}
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}
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return nil
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}
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func doEcEncode(ctx context.Context, commandEnv *CommandEnv, collection string, vid needle.VolumeId) (err error) {
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// find volume location
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locations := commandEnv.MasterClient.GetLocations(uint32(vid))
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if len(locations) == 0 {
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return fmt.Errorf("volume %d not found", vid)
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}
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// mark the volume as readonly
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err = markVolumeReadonly(ctx, commandEnv.option.GrpcDialOption, needle.VolumeId(vid), locations)
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if err != nil {
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return fmt.Errorf("generate ec shards for volume %d on %s: %v", vid, locations[0].Url, err)
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}
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// generate ec shards
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err = generateEcShards(ctx, commandEnv.option.GrpcDialOption, needle.VolumeId(vid), 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", vid, locations[0].Url, err)
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}
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// balance the ec shards to current cluster
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err = spreadEcShards(ctx, commandEnv, vid, collection, locations)
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if err != nil {
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return fmt.Errorf("spread ec shards for volume %d from %s: %v", vid, locations[0].Url, err)
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}
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return nil
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}
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func markVolumeReadonly(ctx context.Context, grpcDialOption grpc.DialOption, volumeId needle.VolumeId, locations []wdclient.Location) error {
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for _, location := range locations {
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err := operation.WithVolumeServerClient(location.Url, grpcDialOption, func(volumeServerClient volume_server_pb.VolumeServerClient) error {
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_, markErr := volumeServerClient.VolumeMarkReadonly(ctx, &volume_server_pb.VolumeMarkReadonlyRequest{
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VolumeId: uint32(volumeId),
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})
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return markErr
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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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}
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return nil
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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 spreadEcShards(ctx context.Context, commandEnv *CommandEnv, volumeId needle.VolumeId, collection string, existingLocations []wdclient.Location) (err error) {
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allEcNodes, totalFreeEcSlots, err := collectEcNodes(ctx, commandEnv, "")
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if err != nil {
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return err
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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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allocatedDataNodes := allEcNodes
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if len(allocatedDataNodes) > erasure_coding.TotalShardsCount {
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allocatedDataNodes = allocatedDataNodes[: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(allocatedDataNodes)
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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, allocatedDataNodes, allocated, volumeId, collection, existingLocations[0])
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if err != nil {
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return err
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}
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// unmount the to be deleted shards
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err = unmountEcShards(ctx, commandEnv.option.GrpcDialOption, volumeId, existingLocations[0].Url, copiedShardIds)
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if err != nil {
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return err
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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, collection, volumeId, existingLocations[0].Url, copiedShardIds)
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if err != nil {
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return fmt.Errorf("source delete copied ecShards %s %d.%v: %v", existingLocations[0].Url, 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 []*EcNode, allocated []int,
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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 *EcNode, startFromShardId uint32, shardCount int) {
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defer wg.Done()
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copiedShardIds, copyErr := oneServerCopyAndMountEcShardsFromSource(ctx, grpcDialOption, server,
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startFromShardId, shardCount, volumeId, collection, existingLocation.Url)
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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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server.addEcVolumeShards(volumeId, collection, copiedShardIds)
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}
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}(server, startFromShardId, allocated[i])
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startFromShardId += uint32(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 balancedEcDistribution(servers []*EcNode) (allocated []int) {
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allocated = make([]int, len(servers))
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allocatedCount := 0
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for allocatedCount < erasure_coding.TotalShardsCount {
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for i, server := range servers {
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if server.freeEcSlot-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 collectVolumeIdsForEcEncode(ctx context.Context, commandEnv *CommandEnv, selectedCollection string, fullPercentage float64, quietPeriod time.Duration) (vids []needle.VolumeId, err error) {
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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
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}
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quietSeconds := int64(quietPeriod / time.Second)
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nowUnixSeconds := time.Now().Unix()
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fmt.Printf("ec encode volumes quiet for: %d seconds\n", quietSeconds)
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vidMap := make(map[uint32]bool)
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eachDataNode(resp.TopologyInfo, func(dc string, rack RackId, dn *master_pb.DataNodeInfo) {
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for _, v := range dn.VolumeInfos {
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if v.Collection == selectedCollection && v.ModifiedAtSecond+quietSeconds < nowUnixSeconds {
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if float64(v.Size) > fullPercentage/100*float64(resp.VolumeSizeLimitMb)*1024*1024 {
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vidMap[v.Id] = true
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}
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}
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}
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})
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for vid, _ := range vidMap {
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vids = append(vids, needle.VolumeId(vid))
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}
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return
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}
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