seaweedfs/weed/command/filer_sync.go

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package command
import (
"context"
"errors"
"fmt"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/pb"
"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
"github.com/chrislusf/seaweedfs/weed/replication"
"github.com/chrislusf/seaweedfs/weed/replication/sink/filersink"
"github.com/chrislusf/seaweedfs/weed/replication/source"
"github.com/chrislusf/seaweedfs/weed/security"
"github.com/chrislusf/seaweedfs/weed/util"
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"github.com/chrislusf/seaweedfs/weed/util/grace"
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"google.golang.org/grpc"
"io"
"strings"
"time"
)
type SyncOptions struct {
isActivePassive *bool
filerA *string
filerB *string
aPath *string
bPath *string
aReplication *string
bReplication *string
aCollection *string
bCollection *string
aTtlSec *int
bTtlSec *int
aDebug *bool
bDebug *bool
aProxyByFiler *bool
bProxyByFiler *bool
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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")
syncOptions.bPath = cmdFilerSynchronize.Flag.String("b.path", "/", "directory to sync on filer B")
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.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")
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syncCpuProfile = cmdFilerSynchronize.Flag.String("cpuprofile", "", "cpu profile output file")
syncMemProfile = cmdFilerSynchronize.Flag.String("memprofile", "", "memory profile output file")
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}
var cmdFilerSynchronize = &Command{
UsageLine: "filer.sync -a=<oneFilerHost>:<oneFilerPort> -b=<otherFilerHost>:<otherFilerPort>",
Short: "resumeable continuous synchronization between two active-active or active-passive SeaweedFS clusters",
Long: `resumeable 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 {
grpcDialOption := security.LoadClientTLS(util.GetViper(), "grpc.client")
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grace.SetupProfiling(*syncCpuProfile, *syncMemProfile)
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go func() {
for {
err := doSubscribeFilerMetaChanges(grpcDialOption, *syncOptions.filerA, *syncOptions.aPath, *syncOptions.aProxyByFiler,
*syncOptions.filerB, *syncOptions.bPath, *syncOptions.bReplication, *syncOptions.bCollection, *syncOptions.bTtlSec, *syncOptions.bProxyByFiler,
*syncOptions.bDebug)
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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 {
go func() {
for {
err := doSubscribeFilerMetaChanges(grpcDialOption, *syncOptions.filerB, *syncOptions.bPath, *syncOptions.bProxyByFiler,
*syncOptions.filerA, *syncOptions.aPath, *syncOptions.aReplication, *syncOptions.aCollection, *syncOptions.aTtlSec, *syncOptions.aProxyByFiler,
*syncOptions.aDebug)
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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
}
func doSubscribeFilerMetaChanges(grpcDialOption grpc.DialOption, sourceFiler, sourcePath string, sourceReadChunkFromFiler bool, targetFiler, targetPath string,
replicationStr, collection string, ttlSec int, sinkWriteChunkByFiler, debug bool) error {
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// read source filer signature
sourceFilerSignature, sourceErr := replication.ReadFilerSignature(grpcDialOption, sourceFiler)
if sourceErr != nil {
return sourceErr
}
// read target filer signature
targetFilerSignature, targetErr := replication.ReadFilerSignature(grpcDialOption, targetFiler)
if targetErr != nil {
return targetErr
}
// if first time, start from now
// if has previously synced, resume from that point of time
sourceFilerOffsetTsNs, err := readSyncOffset(grpcDialOption, targetFiler, sourceFilerSignature)
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, pb.ServerToGrpcAddress(sourceFiler), sourcePath, sourceReadChunkFromFiler)
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filerSink := &filersink.FilerSink{}
filerSink.DoInitialize(targetFiler, pb.ServerToGrpcAddress(targetFiler), targetPath, replicationStr, collection, ttlSec, grpcDialOption, sinkWriteChunkByFiler)
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filerSink.SetSourceFiler(filerSource)
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)
}
for _, sig := range message.Signatures {
if sig == targetFilerSignature && targetFilerSignature != 0 {
fmt.Printf("%s skipping %s change to %v\n", targetFiler, sourceFiler, message)
return nil
}
}
if debug {
fmt.Printf("%s check %s change %s,%s sig %v, target sig: %v\n", targetFiler, sourceFiler, sourceOldKey, sourceNewKey, message.Signatures, targetFilerSignature)
}
if !strings.HasPrefix(resp.Directory, sourcePath) {
return nil
}
// handle deletions
if message.OldEntry != nil && message.NewEntry == nil {
if !strings.HasPrefix(string(sourceOldKey), sourcePath) {
return nil
}
key := util.Join(targetPath, string(sourceOldKey)[len(sourcePath):])
return filerSink.DeleteEntry(key, message.OldEntry.IsDirectory, message.DeleteChunks, message.Signatures)
}
// handle new entries
if message.OldEntry == nil && message.NewEntry != nil {
if !strings.HasPrefix(string(sourceNewKey), sourcePath) {
return nil
}
key := util.Join(targetPath, string(sourceNewKey)[len(sourcePath):])
return filerSink.CreateEntry(key, message.NewEntry, message.Signatures)
}
// this is something special?
if message.OldEntry == nil && message.NewEntry == nil {
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
oldKey := util.Join(targetPath, string(sourceOldKey)[len(sourcePath):])
message.NewParentPath = util.Join(targetPath, message.NewParentPath[len(sourcePath):])
foundExisting, err := filerSink.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 = filerSink.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 := util.Join(targetPath, string(sourceNewKey)[len(sourcePath):])
return filerSink.CreateEntry(newKey, message.NewEntry, message.Signatures)
} else {
// new key is outside of the watched directory
key := util.Join(targetPath, string(sourceOldKey)[len(sourcePath):])
return filerSink.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 := util.Join(targetPath, string(sourceNewKey)[len(sourcePath):])
return filerSink.CreateEntry(key, message.NewEntry, message.Signatures)
} else {
// new key is also outside of the watched directory
// skip
}
}
return nil
}
return pb.WithFilerClient(sourceFiler, grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
stream, err := client.SubscribeMetadata(ctx, &filer_pb.SubscribeMetadataRequest{
ClientName: "syncTo_" + targetFiler,
PathPrefix: sourcePath,
SinceNs: sourceFilerOffsetTsNs,
Signature: targetFilerSignature,
})
if err != nil {
return fmt.Errorf("listen: %v", err)
}
var counter int64
var lastWriteTime time.Time
for {
resp, listenErr := stream.Recv()
if listenErr == io.EOF {
return nil
}
if listenErr != nil {
return listenErr
}
if err := processEventFn(resp); err != nil {
return err
}
counter++
if lastWriteTime.Add(3 * time.Second).Before(time.Now()) {
glog.V(0).Infof("sync %s => %s progressed to %v %0.2f/sec", sourceFiler, targetFiler, time.Unix(0, resp.TsNs), float64(counter)/float64(3))
counter = 0
lastWriteTime = time.Now()
if err := writeSyncOffset(grpcDialOption, targetFiler, sourceFilerSignature, resp.TsNs); err != nil {
return err
}
}
}
})
}
const (
SyncKeyPrefix = "sync."
)
func readSyncOffset(grpcDialOption grpc.DialOption, filer string, filerSignature int32) (lastOffsetTsNs int64, readErr error) {
readErr = pb.WithFilerClient(filer, grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
syncKey := []byte(SyncKeyPrefix + "____")
util.Uint32toBytes(syncKey[len(SyncKeyPrefix):len(SyncKeyPrefix)+4], uint32(filerSignature))
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 writeSyncOffset(grpcDialOption grpc.DialOption, filer string, filerSignature int32, offsetTsNs int64) error {
return pb.WithFilerClient(filer, grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
syncKey := []byte(SyncKeyPrefix + "____")
util.Uint32toBytes(syncKey[len(SyncKeyPrefix):len(SyncKeyPrefix)+4], uint32(filerSignature))
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
})
}