filer.remote.sync: exit when directory is unmounted

this will not propagate the deletions back to the cloud

weed/command/filer_remote_sync.go

@@ -12,7 +12,10 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/replication/source"
 	"github.com/chrislusf/seaweedfs/weed/security"
 	"github.com/chrislusf/seaweedfs/weed/util"
+	"github.com/golang/protobuf/proto"
 	"google.golang.org/grpc"
+	"os"
+	"strings"
 	"time"
 )
 
@@ -102,8 +105,6 @@ func followUpdatesAndUploadToRemote(option *RemoteSyncOptions, filerSource *sour
 		return fmt.Errorf("read mount info: %v", detectErr)
 	}
 
-	dirHash := util.HashStringToLong(mountedDir)
-
 	// 1. specified by timeAgo
 	// 2. last offset timestamp for this directory
 	// 3. directory creation time
@@ -114,7 +115,7 @@ func followUpdatesAndUploadToRemote(option *RemoteSyncOptions, filerSource *sour
 			return fmt.Errorf("lookup %s: %v", mountedDir, err)
 		}
 
-		lastOffsetTsNs, err := getOffset(option.grpcDialOption, *option.filerAddress, RemoteSyncKeyPrefix, int32(dirHash))
+		lastOffsetTsNs, err := remote_storage.GetSyncOffset(option.grpcDialOption, *option.filerAddress, mountedDir)
 		if mountedDirEntry != nil {
 			if err == nil && mountedDirEntry.Attributes.Crtime < lastOffsetTsNs/1000000 {
 				lastOffsetTs = time.Unix(0, lastOffsetTsNs)
@@ -134,8 +135,44 @@ func followUpdatesAndUploadToRemote(option *RemoteSyncOptions, filerSource *sour
 		return err
 	}
 
+	handleEtcRemoteChanges := func(resp *filer_pb.SubscribeMetadataResponse) error {
+		message := resp.EventNotification
+		if message.NewEntry == nil {
+			return nil
+		}
+		if message.NewEntry.Name == filer.REMOTE_STORAGE_MOUNT_FILE {
+			mappings, readErr := filer.UnmarshalRemoteStorageMappings(message.NewEntry.Content)
+			if readErr != nil {
+				return fmt.Errorf("unmarshal mappings: %v", readErr)
+			}
+			if remoteLoc, found := mappings.Mappings[mountedDir]; found {
+				if remoteStorageMountLocation.Bucket != remoteLoc.Bucket || remoteStorageMountLocation.Path != remoteLoc.Path {
+					glog.Fatalf("Unexpected mount changes %+v => %+v", remoteStorageMountLocation, remoteLoc)
+				}
+			} else {
+				glog.V(0).Infof("unmounted %s exiting ...", mountedDir)
+				os.Exit(0)
+			}
+		}
+		if message.NewEntry.Name == remoteStorage.Name + filer.REMOTE_STORAGE_CONF_SUFFIX {
+			conf := &remote_pb.RemoteConf{}
+			if err := proto.Unmarshal(message.NewEntry.Content, conf); err != nil {
+				return fmt.Errorf("unmarshal %s/%s: %v", filer.DirectoryEtcRemote, message.NewEntry.Name, err)
+			}
+			remoteStorage = conf
+			client, err = remote_storage.GetRemoteStorage(remoteStorage)
+			return err
+		}
+
+		return nil
+	}
+
 	eachEntryFunc := func(resp *filer_pb.SubscribeMetadataResponse) error {
 		message := resp.EventNotification
+		if strings.HasPrefix(resp.Directory, filer.DirectoryEtcRemote) {
+			return handleEtcRemoteChanges(resp)
+		}
+
 		if message.OldEntry == nil && message.NewEntry == nil {
 			return nil
 		}
@@ -207,11 +244,11 @@ func followUpdatesAndUploadToRemote(option *RemoteSyncOptions, filerSource *sour
 	processEventFnWithOffset := pb.AddOffsetFunc(eachEntryFunc, 3*time.Second, func(counter int64, lastTsNs int64) error {
 		lastTime := time.Unix(0, lastTsNs)
 		glog.V(0).Infof("remote sync %s progressed to %v %0.2f/sec", *option.filerAddress, lastTime, float64(counter)/float64(3))
-		return setOffset(option.grpcDialOption, *option.filerAddress, RemoteSyncKeyPrefix, int32(dirHash), lastTsNs)
+		return remote_storage.SetSyncOffset(option.grpcDialOption, *option.filerAddress, mountedDir, lastTsNs)
 	})
 
 	return pb.FollowMetadata(*option.filerAddress, option.grpcDialOption, "filer.remote.sync",
-		mountedDir, nil, lastOffsetTs.UnixNano(), 0, processEventFnWithOffset, false)
+		mountedDir, []string{filer.DirectoryEtcRemote}, lastOffsetTs.UnixNano(), 0, processEventFnWithOffset, false)
 }
 
 func toRemoteStorageLocation(mountDir, sourcePath util.FullPath, remoteMountLocation *remote_pb.RemoteStorageLocation) *remote_pb.RemoteStorageLocation {

weed/remote_storage/track_sync_offset.go

@@ -0,0 +1,73 @@
+package remote_storage
+
+import (
+	"context"
+	"errors"
+	"github.com/chrislusf/seaweedfs/weed/pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/util"
+	"google.golang.org/grpc"
+)
+
+const (
+	SyncKeyPrefix = "remote.sync."
+)
+
+func GetSyncOffset(grpcDialOption grpc.DialOption, filer string, dir string) (lastOffsetTsNs int64, readErr error) {
+
+	dirHash := uint32(util.HashStringToLong(dir))
+
+	readErr = pb.WithFilerClient(filer, grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
+		syncKey := []byte(SyncKeyPrefix + "____")
+		util.Uint32toBytes(syncKey[len(SyncKeyPrefix):len(SyncKeyPrefix)+4], dirHash)
+
+		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 SetSyncOffset(grpcDialOption grpc.DialOption, filer string, dir string, offsetTsNs int64) error {
+
+	dirHash := uint32(util.HashStringToLong(dir))
+
+	return pb.WithFilerClient(filer, grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
+
+		syncKey := []byte(SyncKeyPrefix + "____")
+		util.Uint32toBytes(syncKey[len(SyncKeyPrefix):len(SyncKeyPrefix)+4], dirHash)
+
+		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
+
+	})
+
+}

weed/shell/command_remote_unmount.go

@@ -6,8 +6,10 @@ import (
 	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/filer"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/remote_storage"
 	"github.com/chrislusf/seaweedfs/weed/util"
 	"io"
+	"time"
 )
 
 func init() {
@@ -30,9 +32,7 @@ func (c *commandRemoteUnmount) Help() string {
 	remote.mount -dir=/xxx -remote=s3_1/bucket
 
 	# unmount the mounted directory and remove its cache
-	# Make sure you have stopped "weed filer.remote.sync" first!
-	# Otherwise, the deletion will also be propagated to the remote storage!!!
-	remote.unmount -dir=/xxx -iHaveStoppedRemoteSync
+	remote.unmount -dir=/xxx
 
 `
 }
@@ -42,7 +42,6 @@ func (c *commandRemoteUnmount) Do(args []string, commandEnv *CommandEnv, writer
 	remoteMountCommand := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
 
 	dir := remoteMountCommand.String("dir", "", "a directory in filer")
-	hasStoppedRemoteSync := remoteMountCommand.Bool("iHaveStoppedRemoteSync", false, "confirm to stop weed filer.remote.sync first")
 
 	if err = remoteMountCommand.Parse(args); err != nil {
 		return nil
@@ -61,17 +60,21 @@ func (c *commandRemoteUnmount) Do(args []string, commandEnv *CommandEnv, writer
 		return fmt.Errorf("directory %s is not mounted", *dir)
 	}
 
-	if !*hasStoppedRemoteSync {
-		return fmt.Errorf("make sure \"weed filer.remote.sync\" is stopped to avoid data loss")
+	// store a mount configuration in filer
+	fmt.Fprintf(writer, "deleting mount for %s ...\n", *dir)
+	if err = c.deleteMountMapping(commandEnv, *dir); err != nil {
+		return fmt.Errorf("delete mount mapping: %v", err)
 	}
+
 	// purge mounted data
+	fmt.Fprintf(writer, "purge %s ...\n", *dir)
 	if err = c.purgeMountedData(commandEnv, *dir); err != nil {
 		return fmt.Errorf("purge mounted data: %v", err)
 	}
 
-	// store a mount configuration in filer
-	if err = c.deleteMountMapping(commandEnv, *dir); err != nil {
-		return fmt.Errorf("delete mount mapping: %v", err)
+	// reset remote sync offset in case the folder is mounted again
+	if err = remote_storage.SetSyncOffset(commandEnv.option.GrpcDialOption, commandEnv.option.FilerAddress, *dir, time.Now().UnixNano()); err != nil {
+		return fmt.Errorf("reset remote.sync offset for %s: %v", *dir, err)
 	}
 
 	return nil
@@ -100,6 +103,8 @@ func (c *commandRemoteUnmount) purgeMountedData(commandEnv *CommandEnv, dir stri
 		mkdirErr := filer_pb.DoMkdir(client, parent, name, func(entry *filer_pb.Entry) {
 			entry.Attributes = oldEntry.Attributes
 			entry.Extended = oldEntry.Extended
+			entry.Attributes.Crtime = time.Now().Unix()
+			entry.Attributes.Mtime = time.Now().Unix()
 		})
 		if mkdirErr != nil {
 			return fmt.Errorf("mkdir %s: %v", dir, mkdirErr)