seaweedfs/weed/command/filer_meta_backup.go

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package command
import (
"context"
"fmt"
"github.com/seaweedfs/seaweedfs/weed/filer"
"github.com/seaweedfs/seaweedfs/weed/glog"
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"github.com/spf13/viper"
"google.golang.org/grpc"
"reflect"
"time"
"github.com/seaweedfs/seaweedfs/weed/pb"
"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
"github.com/seaweedfs/seaweedfs/weed/security"
"github.com/seaweedfs/seaweedfs/weed/util"
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)
var (
metaBackup FilerMetaBackupOptions
)
type FilerMetaBackupOptions struct {
grpcDialOption grpc.DialOption
filerAddress *string
filerDirectory *string
restart *bool
backupFilerConfig *string
store filer.FilerStore
clientId int32
clientEpoch int32
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}
func init() {
cmdFilerMetaBackup.Run = runFilerMetaBackup // break init cycle
metaBackup.filerAddress = cmdFilerMetaBackup.Flag.String("filer", "localhost:8888", "filer hostname:port")
metaBackup.filerDirectory = cmdFilerMetaBackup.Flag.String("filerDir", "/", "a folder on the filer")
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metaBackup.restart = cmdFilerMetaBackup.Flag.Bool("restart", false, "copy the full metadata before async incremental backup")
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metaBackup.backupFilerConfig = cmdFilerMetaBackup.Flag.String("config", "", "path to filer.toml specifying backup filer store")
metaBackup.clientId = util.RandomInt32()
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}
var cmdFilerMetaBackup = &Command{
UsageLine: "filer.meta.backup [-filer=localhost:8888] [-filerDir=/] [-restart] -config=/path/to/backup_filer.toml",
Short: "continuously backup filer meta data changes to anther filer store specified in a backup_filer.toml",
Long: `continuously backup filer meta data changes.
The backup writes to another filer store specified in a backup_filer.toml.
weed filer.meta.backup -config=/path/to/backup_filer.toml -filer="localhost:8888"
weed filer.meta.backup -config=/path/to/backup_filer.toml -filer="localhost:8888" -restart
`,
}
func runFilerMetaBackup(cmd *Command, args []string) bool {
util.LoadConfiguration("security", false)
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metaBackup.grpcDialOption = security.LoadClientTLS(util.GetViper(), "grpc.client")
// load backup_filer.toml
v := viper.New()
v.SetConfigFile(*metaBackup.backupFilerConfig)
if err := v.ReadInConfig(); err != nil { // Handle errors reading the config file
glog.Fatalf("Failed to load %s file.\nPlease use this command to generate the a %s.toml file\n"+
" weed scaffold -config=%s -output=.\n\n\n",
*metaBackup.backupFilerConfig, "backup_filer", "filer")
}
if err := metaBackup.initStore(v); err != nil {
glog.V(0).Infof("init backup filer store: %v", err)
return true
}
missingPreviousBackup := false
_, err := metaBackup.getOffset()
if err != nil {
missingPreviousBackup = true
}
if *metaBackup.restart || missingPreviousBackup {
glog.V(0).Infof("traversing metadata tree...")
startTime := time.Now()
if err := metaBackup.traverseMetadata(); err != nil {
glog.Errorf("traverse meta data: %v", err)
return true
}
glog.V(0).Infof("metadata copied up to %v", startTime)
if err := metaBackup.setOffset(startTime); err != nil {
startTime = time.Now()
}
}
for {
err := metaBackup.streamMetadataBackup()
if err != nil {
glog.Errorf("filer meta backup from %s: %v", *metaBackup.filerAddress, err)
time.Sleep(1747 * time.Millisecond)
}
}
return true
}
func (metaBackup *FilerMetaBackupOptions) initStore(v *viper.Viper) error {
// load configuration for default filer store
hasDefaultStoreConfigured := false
for _, store := range filer.Stores {
if v.GetBool(store.GetName() + ".enabled") {
store = reflect.New(reflect.ValueOf(store).Elem().Type()).Interface().(filer.FilerStore)
if err := store.Initialize(v, store.GetName()+"."); err != nil {
glog.Fatalf("failed to initialize store for %s: %+v", store.GetName(), err)
}
glog.V(0).Infof("configured filer store to %s", store.GetName())
hasDefaultStoreConfigured = true
metaBackup.store = filer.NewFilerStoreWrapper(store)
break
}
}
if !hasDefaultStoreConfigured {
return fmt.Errorf("no filer store enabled in %s", v.ConfigFileUsed())
}
return nil
}
func (metaBackup *FilerMetaBackupOptions) traverseMetadata() (err error) {
var saveErr error
traverseErr := filer_pb.TraverseBfs(metaBackup, util.FullPath(*metaBackup.filerDirectory), func(parentPath util.FullPath, entry *filer_pb.Entry) {
println("+", parentPath.Child(entry.Name))
if err := metaBackup.store.InsertEntry(context.Background(), filer.FromPbEntry(string(parentPath), entry)); err != nil {
saveErr = fmt.Errorf("insert entry error: %v\n", err)
return
}
})
if traverseErr != nil {
return fmt.Errorf("traverse: %v", traverseErr)
}
return saveErr
}
var (
MetaBackupKey = []byte("metaBackup")
)
func (metaBackup *FilerMetaBackupOptions) streamMetadataBackup() error {
startTime, err := metaBackup.getOffset()
if err != nil {
startTime = time.Now()
}
glog.V(0).Infof("streaming from %v", startTime)
store := metaBackup.store
eachEntryFunc := func(resp *filer_pb.SubscribeMetadataResponse) error {
ctx := context.Background()
message := resp.EventNotification
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if filer_pb.IsEmpty(resp) {
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return nil
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} else if filer_pb.IsCreate(resp) {
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println("+", util.FullPath(message.NewParentPath).Child(message.NewEntry.Name))
entry := filer.FromPbEntry(message.NewParentPath, message.NewEntry)
return store.InsertEntry(ctx, entry)
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} else if filer_pb.IsDelete(resp) {
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println("-", util.FullPath(resp.Directory).Child(message.OldEntry.Name))
return store.DeleteEntry(ctx, util.FullPath(resp.Directory).Child(message.OldEntry.Name))
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} else if filer_pb.IsUpdate(resp) {
println("~", util.FullPath(message.NewParentPath).Child(message.NewEntry.Name))
entry := filer.FromPbEntry(message.NewParentPath, message.NewEntry)
return store.UpdateEntry(ctx, entry)
} else {
// renaming
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println("-", util.FullPath(resp.Directory).Child(message.OldEntry.Name))
if err := store.DeleteEntry(ctx, util.FullPath(resp.Directory).Child(message.OldEntry.Name)); err != nil {
return err
}
println("+", util.FullPath(message.NewParentPath).Child(message.NewEntry.Name))
return store.InsertEntry(ctx, filer.FromPbEntry(message.NewParentPath, message.NewEntry))
}
return nil
}
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processEventFnWithOffset := pb.AddOffsetFunc(eachEntryFunc, 3*time.Second, func(counter int64, lastTsNs int64) error {
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lastTime := time.Unix(0, lastTsNs)
glog.V(0).Infof("meta backup %s progressed to %v %0.2f/sec", *metaBackup.filerAddress, lastTime, float64(counter)/float64(3))
return metaBackup.setOffset(lastTime)
})
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metaBackup.clientEpoch++
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metadataFollowOption := &pb.MetadataFollowOption{
ClientName: "meta_backup",
ClientId: metaBackup.clientId,
ClientEpoch: metaBackup.clientEpoch,
SelfSignature: 0,
PathPrefix: *metaBackup.filerDirectory,
AdditionalPathPrefixes: nil,
DirectoriesToWatch: nil,
StartTsNs: startTime.UnixNano(),
StopTsNs: 0,
EventErrorType: pb.TrivialOnError,
}
return pb.FollowMetadata(pb.ServerAddress(*metaBackup.filerAddress), metaBackup.grpcDialOption, metadataFollowOption, processEventFnWithOffset)
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}
func (metaBackup *FilerMetaBackupOptions) getOffset() (lastWriteTime time.Time, err error) {
value, err := metaBackup.store.KvGet(context.Background(), MetaBackupKey)
if err != nil {
return
}
tsNs := util.BytesToUint64(value)
return time.Unix(0, int64(tsNs)), nil
}
func (metaBackup *FilerMetaBackupOptions) setOffset(lastWriteTime time.Time) error {
valueBuf := make([]byte, 8)
util.Uint64toBytes(valueBuf, uint64(lastWriteTime.UnixNano()))
if err := metaBackup.store.KvPut(context.Background(), MetaBackupKey, valueBuf); err != nil {
return err
}
return nil
}
var _ = filer_pb.FilerClient(&FilerMetaBackupOptions{})
func (metaBackup *FilerMetaBackupOptions) WithFilerClient(streamingMode bool, fn func(filer_pb.SeaweedFilerClient) error) error {
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return pb.WithFilerClient(streamingMode, metaBackup.clientId, pb.ServerAddress(*metaBackup.filerAddress), metaBackup.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
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return fn(client)
})
}
func (metaBackup *FilerMetaBackupOptions) AdjustedUrl(location *filer_pb.Location) string {
return location.Url
}
func (metaBackup *FilerMetaBackupOptions) GetDataCenter() string {
return ""
}