seaweedfs/weed/command/filer_sync.go

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package command
import (
"context"
"errors"
"fmt"
"github.com/seaweedfs/seaweedfs/weed/glog"
"github.com/seaweedfs/seaweedfs/weed/pb"
"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
"github.com/seaweedfs/seaweedfs/weed/replication"
"github.com/seaweedfs/seaweedfs/weed/replication/sink"
"github.com/seaweedfs/seaweedfs/weed/replication/sink/filersink"
"github.com/seaweedfs/seaweedfs/weed/replication/source"
"github.com/seaweedfs/seaweedfs/weed/security"
statsCollect "github.com/seaweedfs/seaweedfs/weed/stats"
"github.com/seaweedfs/seaweedfs/weed/util"
"github.com/seaweedfs/seaweedfs/weed/util/grace"
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"google.golang.org/grpc"
"os"
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"strings"
"time"
)
type SyncOptions struct {
isActivePassive *bool
filerA *string
filerB *string
aPath *string
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aExcludePaths *string
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bPath *string
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bExcludePaths *string
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aReplication *string
bReplication *string
aCollection *string
bCollection *string
aTtlSec *int
bTtlSec *int
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aDiskType *string
bDiskType *string
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aDebug *bool
bDebug *bool
aFromTsMs *int64
bFromTsMs *int64
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aProxyByFiler *bool
bProxyByFiler *bool
metricsHttpPort *int
clientId int32
clientEpoch int32
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}
var (
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syncOptions SyncOptions
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syncCpuProfile *string
syncMemProfile *string
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)
func init() {
cmdFilerSynchronize.Run = runFilerSynchronize // break init cycle
syncOptions.isActivePassive = cmdFilerSynchronize.Flag.Bool("isActivePassive", false, "one directional follow from A to B if true")
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syncOptions.filerA = cmdFilerSynchronize.Flag.String("a", "", "filer A in one SeaweedFS cluster")
syncOptions.filerB = cmdFilerSynchronize.Flag.String("b", "", "filer B in the other SeaweedFS cluster")
syncOptions.aPath = cmdFilerSynchronize.Flag.String("a.path", "/", "directory to sync on filer A")
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syncOptions.aExcludePaths = cmdFilerSynchronize.Flag.String("a.excludePaths", "", "exclude directories to sync on filer A")
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syncOptions.bPath = cmdFilerSynchronize.Flag.String("b.path", "/", "directory to sync on filer B")
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syncOptions.bExcludePaths = cmdFilerSynchronize.Flag.String("b.excludePaths", "", "exclude directories to sync on filer B")
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syncOptions.aReplication = cmdFilerSynchronize.Flag.String("a.replication", "", "replication on filer A")
syncOptions.bReplication = cmdFilerSynchronize.Flag.String("b.replication", "", "replication on filer B")
syncOptions.aCollection = cmdFilerSynchronize.Flag.String("a.collection", "", "collection on filer A")
syncOptions.bCollection = cmdFilerSynchronize.Flag.String("b.collection", "", "collection on filer B")
syncOptions.aTtlSec = cmdFilerSynchronize.Flag.Int("a.ttlSec", 0, "ttl in seconds on filer A")
syncOptions.bTtlSec = cmdFilerSynchronize.Flag.Int("b.ttlSec", 0, "ttl in seconds on filer B")
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syncOptions.aDiskType = cmdFilerSynchronize.Flag.String("a.disk", "", "[hdd|ssd|<tag>] hard drive or solid state drive or any tag on filer A")
syncOptions.bDiskType = cmdFilerSynchronize.Flag.String("b.disk", "", "[hdd|ssd|<tag>] hard drive or solid state drive or any tag on filer B")
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syncOptions.aProxyByFiler = cmdFilerSynchronize.Flag.Bool("a.filerProxy", false, "read and write file chunks by filer A instead of volume servers")
syncOptions.bProxyByFiler = cmdFilerSynchronize.Flag.Bool("b.filerProxy", false, "read and write file chunks by filer B instead of volume servers")
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syncOptions.aDebug = cmdFilerSynchronize.Flag.Bool("a.debug", false, "debug mode to print out filer A received files")
syncOptions.bDebug = cmdFilerSynchronize.Flag.Bool("b.debug", false, "debug mode to print out filer B received files")
syncOptions.aFromTsMs = cmdFilerSynchronize.Flag.Int64("a.fromTsMs", 0, "synchronization from timestamp on filer A. The unit is millisecond")
syncOptions.bFromTsMs = cmdFilerSynchronize.Flag.Int64("b.fromTsMs", 0, "synchronization from timestamp on filer B. The unit is millisecond")
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syncCpuProfile = cmdFilerSynchronize.Flag.String("cpuprofile", "", "cpu profile output file")
syncMemProfile = cmdFilerSynchronize.Flag.String("memprofile", "", "memory profile output file")
syncOptions.metricsHttpPort = cmdFilerSynchronize.Flag.Int("metricsPort", 0, "metrics listen port")
syncOptions.clientId = util.RandomInt32()
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}
var cmdFilerSynchronize = &Command{
UsageLine: "filer.sync -a=<oneFilerHost>:<oneFilerPort> -b=<otherFilerHost>:<otherFilerPort>",
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Short: "resumable continuous synchronization between two active-active or active-passive SeaweedFS clusters",
Long: `resumable continuous synchronization for file changes between two active-active or active-passive filers
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filer.sync listens on filer notifications. If any file is updated, it will fetch the updated content,
and write to the other destination. Different from filer.replicate:
* filer.sync only works between two filers.
* filer.sync does not need any special message queue setup.
* filer.sync supports both active-active and active-passive modes.
If restarted, the synchronization will resume from the previous checkpoints, persisted every minute.
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A fresh sync will start from the earliest metadata logs.
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`,
}
func runFilerSynchronize(cmd *Command, args []string) bool {
util.LoadConfiguration("security", false)
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grpcDialOption := security.LoadClientTLS(util.GetViper(), "grpc.client")
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grace.SetupProfiling(*syncCpuProfile, *syncMemProfile)
filerA := pb.ServerAddress(*syncOptions.filerA)
filerB := pb.ServerAddress(*syncOptions.filerB)
// start filer.sync metrics server
go statsCollect.StartMetricsServer(*syncOptions.metricsHttpPort)
// read a filer signature
aFilerSignature, aFilerErr := replication.ReadFilerSignature(grpcDialOption, filerA)
if aFilerErr != nil {
glog.Errorf("get filer 'a' signature %d error from %s to %s: %v", aFilerSignature, *syncOptions.filerA, *syncOptions.filerB, aFilerErr)
return true
}
// read b filer signature
bFilerSignature, bFilerErr := replication.ReadFilerSignature(grpcDialOption, filerB)
if bFilerErr != nil {
glog.Errorf("get filer 'b' signature %d error from %s to %s: %v", bFilerSignature, *syncOptions.filerA, *syncOptions.filerB, bFilerErr)
return true
}
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go func() {
// a->b
// set synchronization start timestamp to offset
initOffsetError := initOffsetFromTsMs(grpcDialOption, filerB, aFilerSignature, *syncOptions.bFromTsMs)
if initOffsetError != nil {
glog.Errorf("init offset from timestamp %d error from %s to %s: %v", *syncOptions.bFromTsMs, *syncOptions.filerA, *syncOptions.filerB, initOffsetError)
os.Exit(2)
}
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for {
syncOptions.clientEpoch++
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err := doSubscribeFilerMetaChanges(
syncOptions.clientId,
syncOptions.clientEpoch,
grpcDialOption,
filerA,
*syncOptions.aPath,
strings.Split(*syncOptions.aExcludePaths, ","),
*syncOptions.aProxyByFiler,
filerB,
*syncOptions.bPath,
*syncOptions.bReplication,
*syncOptions.bCollection,
*syncOptions.bTtlSec,
*syncOptions.bProxyByFiler,
*syncOptions.bDiskType,
*syncOptions.bDebug,
aFilerSignature,
bFilerSignature)
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if err != nil {
glog.Errorf("sync from %s to %s: %v", *syncOptions.filerA, *syncOptions.filerB, err)
time.Sleep(1747 * time.Millisecond)
}
}
}()
if !*syncOptions.isActivePassive {
// b->a
// set synchronization start timestamp to offset
initOffsetError := initOffsetFromTsMs(grpcDialOption, filerA, bFilerSignature, *syncOptions.aFromTsMs)
if initOffsetError != nil {
glog.Errorf("init offset from timestamp %d error from %s to %s: %v", *syncOptions.aFromTsMs, *syncOptions.filerB, *syncOptions.filerA, initOffsetError)
os.Exit(2)
}
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go func() {
for {
syncOptions.clientEpoch++
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err := doSubscribeFilerMetaChanges(
syncOptions.clientId,
syncOptions.clientEpoch,
grpcDialOption,
filerB,
*syncOptions.bPath,
strings.Split(*syncOptions.bExcludePaths, ","),
*syncOptions.bProxyByFiler,
filerA,
*syncOptions.aPath,
*syncOptions.aReplication,
*syncOptions.aCollection,
*syncOptions.aTtlSec,
*syncOptions.aProxyByFiler,
*syncOptions.aDiskType,
*syncOptions.aDebug,
bFilerSignature,
aFilerSignature)
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if err != nil {
glog.Errorf("sync from %s to %s: %v", *syncOptions.filerB, *syncOptions.filerA, err)
time.Sleep(2147 * time.Millisecond)
}
}
}()
}
select {}
return true
}
// initOffsetFromTsMs Initialize offset
func initOffsetFromTsMs(grpcDialOption grpc.DialOption, targetFiler pb.ServerAddress, sourceFilerSignature int32, fromTsMs int64) error {
if fromTsMs <= 0 {
return nil
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}
// convert to nanosecond
fromTsNs := fromTsMs * 1000_000
// If not successful, exit the program.
setOffsetErr := setOffset(grpcDialOption, targetFiler, SyncKeyPrefix, sourceFilerSignature, fromTsNs)
if setOffsetErr != nil {
return setOffsetErr
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}
glog.Infof("setOffset from timestamp ms success! start offset: %d from %s to %s", fromTsNs, *syncOptions.filerA, *syncOptions.filerB)
return nil
}
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func doSubscribeFilerMetaChanges(clientId int32, clientEpoch int32, grpcDialOption grpc.DialOption, sourceFiler pb.ServerAddress, sourcePath string, sourceExcludePaths []string, sourceReadChunkFromFiler bool, targetFiler pb.ServerAddress, targetPath string,
replicationStr, collection string, ttlSec int, sinkWriteChunkByFiler bool, diskType string, debug bool, sourceFilerSignature int32, targetFilerSignature int32) error {
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// if first time, start from now
// if has previously synced, resume from that point of time
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sourceFilerOffsetTsNs, err := getOffset(grpcDialOption, targetFiler, getSignaturePrefixByPath(sourcePath), sourceFilerSignature)
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if err != nil {
return err
}
glog.V(0).Infof("start sync %s(%d) => %s(%d) from %v(%d)", sourceFiler, sourceFilerSignature, targetFiler, targetFilerSignature, time.Unix(0, sourceFilerOffsetTsNs), sourceFilerOffsetTsNs)
// create filer sink
filerSource := &source.FilerSource{}
filerSource.DoInitialize(sourceFiler.ToHttpAddress(), sourceFiler.ToGrpcAddress(), sourcePath, sourceReadChunkFromFiler)
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filerSink := &filersink.FilerSink{}
filerSink.DoInitialize(targetFiler.ToHttpAddress(), targetFiler.ToGrpcAddress(), targetPath, replicationStr, collection, ttlSec, diskType, grpcDialOption, sinkWriteChunkByFiler)
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filerSink.SetSourceFiler(filerSource)
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persistEventFn := genProcessFunction(sourcePath, targetPath, sourceExcludePaths, filerSink, debug)
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processEventFn := func(resp *filer_pb.SubscribeMetadataResponse) error {
message := resp.EventNotification
for _, sig := range message.Signatures {
if sig == targetFilerSignature && targetFilerSignature != 0 {
fmt.Printf("%s skipping %s change to %v\n", targetFiler, sourceFiler, message)
return nil
}
}
return persistEventFn(resp)
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}
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var lastLogTsNs = time.Now().UnixNano()
var clientName = fmt.Sprintf("syncFrom_%s_To_%s", string(sourceFiler), string(targetFiler))
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processEventFnWithOffset := pb.AddOffsetFunc(processEventFn, 3*time.Second, func(counter int64, lastTsNs int64) error {
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now := time.Now().UnixNano()
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glog.V(0).Infof("sync %s to %s progressed to %v %0.2f/sec", sourceFiler, targetFiler, time.Unix(0, lastTsNs), float64(counter)/(float64(now-lastLogTsNs)/1e9))
lastLogTsNs = now
// collect synchronous offset
statsCollect.FilerSyncOffsetGauge.WithLabelValues(sourceFiler.String(), targetFiler.String(), clientName, sourcePath).Set(float64(lastTsNs))
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return setOffset(grpcDialOption, targetFiler, getSignaturePrefixByPath(sourcePath), sourceFilerSignature, lastTsNs)
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})
return pb.FollowMetadata(sourceFiler, grpcDialOption, clientName, clientId, clientEpoch,
sourcePath, nil, sourceFilerOffsetTsNs, 0, targetFilerSignature, processEventFnWithOffset, pb.RetryForeverOnError)
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}
const (
SyncKeyPrefix = "sync."
)
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// When each business is distinguished according to path, and offsets need to be maintained separately.
func getSignaturePrefixByPath(path string) string {
// compatible historical version
if path == "/" {
return SyncKeyPrefix
} else {
return SyncKeyPrefix + path
}
}
func getOffset(grpcDialOption grpc.DialOption, filer pb.ServerAddress, signaturePrefix string, signature int32) (lastOffsetTsNs int64, readErr error) {
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readErr = pb.WithFilerClient(false, filer, grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
syncKey := []byte(signaturePrefix + "____")
util.Uint32toBytes(syncKey[len(signaturePrefix):len(signaturePrefix)+4], uint32(signature))
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resp, err := client.KvGet(context.Background(), &filer_pb.KvGetRequest{Key: syncKey})
if err != nil {
return err
}
if len(resp.Error) != 0 {
return errors.New(resp.Error)
}
if len(resp.Value) < 8 {
return nil
}
lastOffsetTsNs = int64(util.BytesToUint64(resp.Value))
return nil
})
return
}
func setOffset(grpcDialOption grpc.DialOption, filer pb.ServerAddress, signaturePrefix string, signature int32, offsetTsNs int64) error {
return pb.WithFilerClient(false, filer, grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
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syncKey := []byte(signaturePrefix + "____")
util.Uint32toBytes(syncKey[len(signaturePrefix):len(signaturePrefix)+4], uint32(signature))
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valueBuf := make([]byte, 8)
util.Uint64toBytes(valueBuf, uint64(offsetTsNs))
resp, err := client.KvPut(context.Background(), &filer_pb.KvPutRequest{
Key: syncKey,
Value: valueBuf,
})
if err != nil {
return err
}
if len(resp.Error) != 0 {
return errors.New(resp.Error)
}
return nil
})
}
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func genProcessFunction(sourcePath string, targetPath string, excludePaths []string, dataSink sink.ReplicationSink, debug bool) func(resp *filer_pb.SubscribeMetadataResponse) error {
// process function
processEventFn := func(resp *filer_pb.SubscribeMetadataResponse) error {
message := resp.EventNotification
var sourceOldKey, sourceNewKey util.FullPath
if message.OldEntry != nil {
sourceOldKey = util.FullPath(resp.Directory).Child(message.OldEntry.Name)
}
if message.NewEntry != nil {
sourceNewKey = util.FullPath(message.NewParentPath).Child(message.NewEntry.Name)
}
if debug {
glog.V(0).Infof("received %v", resp)
}
if !strings.HasPrefix(resp.Directory, sourcePath) {
return nil
}
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for _, excludePath := range excludePaths {
if strings.HasPrefix(resp.Directory, excludePath) {
return nil
}
}
// handle deletions
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if filer_pb.IsDelete(resp) {
if !strings.HasPrefix(string(sourceOldKey), sourcePath) {
return nil
}
key := buildKey(dataSink, message, targetPath, sourceOldKey, sourcePath)
if !dataSink.IsIncremental() {
return dataSink.DeleteEntry(key, message.OldEntry.IsDirectory, message.DeleteChunks, message.Signatures)
}
return nil
}
// handle new entries
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if filer_pb.IsCreate(resp) {
if !strings.HasPrefix(string(sourceNewKey), sourcePath) {
return nil
}
key := buildKey(dataSink, message, targetPath, sourceNewKey, sourcePath)
return dataSink.CreateEntry(key, message.NewEntry, message.Signatures)
}
// this is something special?
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if filer_pb.IsEmpty(resp) {
return nil
}
// handle updates
if strings.HasPrefix(string(sourceOldKey), sourcePath) {
// old key is in the watched directory
if strings.HasPrefix(string(sourceNewKey), sourcePath) {
// new key is also in the watched directory
if !dataSink.IsIncremental() {
oldKey := util.Join(targetPath, string(sourceOldKey)[len(sourcePath):])
message.NewParentPath = util.Join(targetPath, message.NewParentPath[len(sourcePath):])
foundExisting, err := dataSink.UpdateEntry(string(oldKey), message.OldEntry, message.NewParentPath, message.NewEntry, message.DeleteChunks, message.Signatures)
if foundExisting {
return err
}
// not able to find old entry
if err = dataSink.DeleteEntry(string(oldKey), message.OldEntry.IsDirectory, false, message.Signatures); err != nil {
return fmt.Errorf("delete old entry %v: %v", oldKey, err)
}
}
// create the new entry
newKey := buildKey(dataSink, message, targetPath, sourceNewKey, sourcePath)
return dataSink.CreateEntry(newKey, message.NewEntry, message.Signatures)
} else {
// new key is outside of the watched directory
if !dataSink.IsIncremental() {
key := buildKey(dataSink, message, targetPath, sourceOldKey, sourcePath)
return dataSink.DeleteEntry(key, message.OldEntry.IsDirectory, message.DeleteChunks, message.Signatures)
}
}
} else {
// old key is outside of the watched directory
if strings.HasPrefix(string(sourceNewKey), sourcePath) {
// new key is in the watched directory
key := buildKey(dataSink, message, targetPath, sourceNewKey, sourcePath)
return dataSink.CreateEntry(key, message.NewEntry, message.Signatures)
} else {
// new key is also outside of the watched directory
// skip
}
}
return nil
}
return processEventFn
}
func buildKey(dataSink sink.ReplicationSink, message *filer_pb.EventNotification, targetPath string, sourceKey util.FullPath, sourcePath string) (key string) {
if !dataSink.IsIncremental() {
key = util.Join(targetPath, string(sourceKey)[len(sourcePath):])
} else {
var mTime int64
if message.NewEntry != nil {
mTime = message.NewEntry.Attributes.Mtime
} else if message.OldEntry != nil {
mTime = message.OldEntry.Attributes.Mtime
}
dateKey := time.Unix(mTime, 0).Format("2006-01-02")
key = util.Join(targetPath, dateKey, string(sourceKey)[len(sourcePath):])
}
return escapeKey(key)
}