add distributed lock manager

other/java/client/src/main/proto/filer.proto

@@ -460,7 +460,7 @@ message UnlockResponse {
 message Lock {
     string name = 1;
     string renew_token = 2;
-    int64 expiration_ns = 3;
+    int64 expired_at_ns = 3;
 }
 message TransferLocksRequest {
     repeated Lock locks = 1;

weed/cluster/lock_manager/distributed_lock_manager.go

@@ -0,0 +1,50 @@
+package lock_manager
+
+import (
+	"github.com/seaweedfs/seaweedfs/weed/pb"
+)
+
+type DistributedLockManager struct {
+	lockManager *LockManager
+}
+
+func NewDistributedLockManager() *DistributedLockManager {
+	return &DistributedLockManager{
+		lockManager: NewLockManager(),
+	}
+}
+
+func (dlm *DistributedLockManager) Lock(host pb.ServerAddress, key string, expiredAtNs int64, token string, servers []pb.ServerAddress) (renewToken string, movedTo pb.ServerAddress, err error) {
+	server := HashKeyToServer(key, servers)
+	if server != host {
+		movedTo = server
+		return
+	}
+	renewToken, err = dlm.lockManager.Lock(key, expiredAtNs, token)
+	return
+}
+
+func (dlm *DistributedLockManager) Unlock(host pb.ServerAddress, key string, token string, servers []pb.ServerAddress) (movedTo pb.ServerAddress, err error) {
+	server := HashKeyToServer(key, servers)
+	if server != host {
+		movedTo = server
+		return
+	}
+	_, err = dlm.lockManager.Unlock(key, token)
+	return
+}
+
+// InsertLock is used to insert a lock to a server unconditionally
+// It is used when a server is down and the lock is moved to another server
+func (dlm *DistributedLockManager) InsertLock(key string, expiredAtNs int64, token string) {
+	dlm.lockManager.InsertLock(key, expiredAtNs, token)
+}
+func (dlm *DistributedLockManager) SelectNotOwnedLocks(host pb.ServerAddress, servers []pb.ServerAddress) (locks []*Lock) {
+	return dlm.lockManager.SelectLocks(func(key string) bool {
+		server := HashKeyToServer(key, servers)
+		return server != host
+	})
+}
+func (dlm *DistributedLockManager) CalculateTargetServer(key string, servers []pb.ServerAddress) pb.ServerAddress {
+	return HashKeyToServer(key, servers)
+}

weed/cluster/lock_manager/lock_manager.go

@@ -12,9 +12,9 @@ type LockManager struct {
 	locks *xsync.MapOf[string, *Lock]
 }
 type Lock struct {
-	Token        string
-	ExpirationNs int64
-	Key          string // only used for moving locks
+	Token       string
+	ExpiredAtNs int64
+	Key         string // only used for moving locks
 }
 
 func NewLockManager() *LockManager {
@@ -25,32 +25,37 @@ func NewLockManager() *LockManager {
 	return t
 }
 
-func (lm *LockManager) Lock(path string, ttlDuration time.Duration, token string) (renewToken string, err error) {
+func (lm *LockManager) Lock(path string, expiredAtNs int64, token string) (renewToken string, err error) {
 	lm.locks.Compute(path, func(oldValue *Lock, loaded bool) (newValue *Lock, delete bool) {
 		if oldValue != nil {
-			now := time.Now()
-			if oldValue.ExpirationNs > 0 && oldValue.ExpirationNs < now.UnixNano() {
+			if oldValue.ExpiredAtNs > 0 && oldValue.ExpiredAtNs < time.Now().UnixNano() {
 				// lock is expired, set to a new lock
-				expirationNs := time.Now().Add(ttlDuration).UnixNano()
-				return &Lock{Token: token, ExpirationNs: expirationNs}, false
+				if token != "" {
+					err = fmt.Errorf("lock: non-empty token on an expired lock")
+					return nil, false
+				} else {
+					// new lock
+					renewToken = uuid.New().String()
+					return &Lock{Token: renewToken, ExpiredAtNs: expiredAtNs}, false
+				}
 			}
+			// not expired
 			if oldValue.Token == token {
-				expirationNs := time.Now().Add(ttlDuration).UnixNano()
-				return &Lock{Token: token, ExpirationNs: expirationNs}, false
+				// token matches, renew the lock
+				return &Lock{Token: token, ExpiredAtNs: expiredAtNs}, false
 			} else {
 				err = fmt.Errorf("lock: token mismatch")
 				return oldValue, false
 			}
 		} else {
-			expirationNs := time.Now().Add(ttlDuration).UnixNano()
 			if token == "" {
+				// new lock
 				renewToken = uuid.New().String()
-				return &Lock{Token: renewToken, ExpirationNs: expirationNs}, false
+				return &Lock{Token: renewToken, ExpiredAtNs: expiredAtNs}, false
 			} else {
 				err = fmt.Errorf("lock: non-empty token on a new lock")
 				return nil, false
 			}
-			return &Lock{Token: token, ExpirationNs: expirationNs}, false
 		}
 	})
 	return
@@ -60,13 +65,13 @@ func (lm *LockManager) Unlock(path string, token string) (isUnlocked bool, err e
 	lm.locks.Compute(path, func(oldValue *Lock, loaded bool) (newValue *Lock, delete bool) {
 		if oldValue != nil {
 			now := time.Now()
-			if oldValue.ExpirationNs > 0 && oldValue.ExpirationNs < now.UnixNano() {
+			if oldValue.ExpiredAtNs > 0 && oldValue.ExpiredAtNs < now.UnixNano() {
 				// lock is expired, delete it
 				isUnlocked = true
 				return nil, true
 			}
 			if oldValue.Token == token {
-				if oldValue.ExpirationNs <= now.UnixNano() {
+				if oldValue.ExpiredAtNs <= now.UnixNano() {
 					isUnlocked = true
 					return nil, true
 				}
@@ -89,7 +94,7 @@ func (lm *LockManager) CleanUp() {
 		time.Sleep(1 * time.Minute)
 		now := time.Now().UnixNano()
 		lm.locks.Range(func(key string, value *Lock) bool {
-			if now > value.ExpirationNs {
+			if now > value.ExpiredAtNs {
 				lm.locks.Delete(key)
 				return true
 			}
@@ -98,16 +103,16 @@ func (lm *LockManager) CleanUp() {
 	}
 }
 
-// TakeOutLocksByKey takes out locks by key
+// SelectLocks takes out locks by key
 // if keyFn return true, the lock will be taken out
-func (lm *LockManager) TakeOutLocksByKey(keyFn func(key string) bool) (locks []*Lock) {
+func (lm *LockManager) SelectLocks(selectFn func(key string) bool) (locks []*Lock) {
 	now := time.Now().UnixNano()
 	lm.locks.Range(func(key string, lock *Lock) bool {
-		if now > lock.ExpirationNs {
+		if now > lock.ExpiredAtNs {
 			lm.locks.Delete(key)
 			return true
 		}
-		if keyFn(key) {
+		if selectFn(key) {
 			lm.locks.Delete(key)
 			lock.Key = key
 			locks = append(locks, lock)
@@ -116,3 +121,8 @@ func (lm *LockManager) TakeOutLocksByKey(keyFn func(key string) bool) (locks []*
 	})
 	return
 }
+
+// InsertLock inserts a lock unconditionally
+func (lm *LockManager) InsertLock(path string, expiredAtNs int64, token string) {
+	lm.locks.Store(path, &Lock{Token: token, ExpiredAtNs: expiredAtNs})
+}

weed/pb/filer.proto

@@ -460,7 +460,7 @@ message UnlockResponse {
 message Lock {
     string name = 1;
     string renew_token = 2;
-    int64 expiration_ns = 3;
+    int64 expired_at_ns = 3;
 }
 message TransferLocksRequest {
     repeated Lock locks = 1;

weed/pb/filer_pb/filer.pb.go

@@ -3853,9 +3853,9 @@ type Lock struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Name         string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
-	RenewToken   string `protobuf:"bytes,2,opt,name=renew_token,json=renewToken,proto3" json:"renew_token,omitempty"`
-	ExpirationNs int64  `protobuf:"varint,3,opt,name=expiration_ns,json=expirationNs,proto3" json:"expiration_ns,omitempty"`
+	Name        string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
+	RenewToken  string `protobuf:"bytes,2,opt,name=renew_token,json=renewToken,proto3" json:"renew_token,omitempty"`
+	ExpiredAtNs int64  `protobuf:"varint,3,opt,name=expired_at_ns,json=expiredAtNs,proto3" json:"expired_at_ns,omitempty"`
 }
 
 func (x *Lock) Reset() {
@@ -3904,9 +3904,9 @@ func (x *Lock) GetRenewToken() string {
 	return ""
 }
 
-func (x *Lock) GetExpirationNs() int64 {
+func (x *Lock) GetExpiredAtNs() int64 {
 	if x != nil {
-		return x.ExpirationNs
+		return x.ExpiredAtNs
 	}
 	return 0
 }
@@ -4694,146 +4694,146 @@ var file_filer_proto_rawDesc = []byte{
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 }
 
 var (

weed/server/filer_grpc_server_dlm.go

@@ -3,7 +3,6 @@ package weed_server
 import (
 	"context"
 	"fmt"
-	"github.com/seaweedfs/seaweedfs/weed/cluster/lock_manager"
 	"github.com/seaweedfs/seaweedfs/weed/glog"
 	"github.com/seaweedfs/seaweedfs/weed/pb"
 	"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
@@ -18,21 +17,17 @@ func (fs *FilerServer) Lock(ctx context.Context, req *filer_pb.LockRequest) (res
 	if snapshot == nil {
 		resp.Error = "no lock server found"
 		return
-	} else {
-		server := lock_manager.HashKeyToServer(req.Name, snapshot)
-		if server != fs.option.Host {
-			resp.Error = fmt.Sprintf("not the lock server for %s", req.Name)
-			resp.MovedTo = string(server)
-			return
-		}
 	}
 
-	renewToken, err := fs.dlm.Lock(req.Name, time.Duration(req.SecondsToLock)*time.Second, req.PreviousLockToken)
+	var movedTo pb.ServerAddress
+	expiredAtNs := time.Now().Add(time.Duration(req.SecondsToLock) * time.Second).UnixNano()
+	resp.RenewToken, movedTo, err = fs.dlm.Lock(fs.option.Host, req.Name, expiredAtNs, req.PreviousLockToken, snapshot)
 
 	if err != nil {
 		resp.Error = fmt.Sprintf("%v", err)
-	} else {
-		resp.RenewToken = renewToken
+	}
+	if movedTo != "" {
+		resp.MovedTo = string(movedTo)
 	}
 
 	return resp, nil
@@ -46,16 +41,9 @@ func (fs *FilerServer) Unlock(ctx context.Context, req *filer_pb.UnlockRequest)
 	if snapshot == nil {
 		resp.Error = "no lock server found"
 		return
-	} else {
-		server := lock_manager.HashKeyToServer(req.Name, snapshot)
-		if server != fs.option.Host {
-			resp.Error = fmt.Sprintf("not the lock server for %s", req.Name)
-			resp.MovedTo = string(server)
-			return
-		}
 	}
 
-	_, err = fs.dlm.Unlock(req.Name, req.LockToken)
+	_, err = fs.dlm.Unlock(fs.option.Host, req.Name, req.LockToken, snapshot)
 	if err != nil {
 		resp.Error = fmt.Sprintf("%v", err)
 	}
@@ -67,13 +55,8 @@ func (fs *FilerServer) Unlock(ctx context.Context, req *filer_pb.UnlockRequest)
 // TransferLocks is a grpc handler to handle FilerServer's TransferLocksRequest
 func (fs *FilerServer) TransferLocks(ctx context.Context, req *filer_pb.TransferLocksRequest) (*filer_pb.TransferLocksResponse, error) {
 
-	now := time.Now()
 	for _, lock := range req.Locks {
-		duration := time.Duration(lock.ExpirationNs - now.UnixNano())
-		if _, err := fs.dlm.Lock(lock.Name, duration, lock.RenewToken); err != nil {
-			glog.Errorf("receive transferred lock %v to %v: %v", lock.Name, fs.option.Host, err)
-			return nil, err
-		}
+		fs.dlm.InsertLock(lock.Name, lock.ExpiredAtNs, lock.RenewToken)
 	}
 
 	return &filer_pb.TransferLocksResponse{}, nil
@@ -81,23 +64,20 @@ func (fs *FilerServer) TransferLocks(ctx context.Context, req *filer_pb.Transfer
 }
 
 func (fs *FilerServer) OnDlmChangeSnapshot(snapshot []pb.ServerAddress) {
-	locks := fs.dlm.TakeOutLocksByKey(func(key string) bool {
-		server := lock_manager.HashKeyToServer(key, snapshot)
-		return server != fs.option.Host
-	})
+	locks := fs.dlm.SelectNotOwnedLocks(fs.option.Host, snapshot)
 	if len(locks) == 0 {
 		return
 	}
 
 	for _, lock := range locks {
-		server := lock_manager.HashKeyToServer(lock.Key, snapshot)
+		server := fs.dlm.CalculateTargetServer(lock.Key, snapshot)
 		if err := pb.WithFilerClient(false, 0, server, fs.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
 			_, err := client.TransferLocks(context.Background(), &filer_pb.TransferLocksRequest{
 				Locks: []*filer_pb.Lock{
 					{
-						Name:         lock.Key,
-						RenewToken:   lock.Token,
-						ExpirationNs: lock.ExpirationNs,
+						Name:        lock.Key,
+						RenewToken:  lock.Token,
+						ExpiredAtNs: lock.ExpiredAtNs,
 					},
 				},
 			})

weed/server/filer_server.go

@@ -97,7 +97,7 @@ type FilerServer struct {
 	knownListeners     map[int32]int32
 
 	// distributed lock manager
-	dlm *lock_manager.LockManager
+	dlm *lock_manager.DistributedLockManager
 }
 
 func NewFilerServer(defaultMux, readonlyMux *http.ServeMux, option *FilerOption) (fs *FilerServer, err error) {
@@ -185,7 +185,7 @@ func NewFilerServer(defaultMux, readonlyMux *http.ServeMux, option *FilerOption)
 		fs.filer.Shutdown()
 	})
 
-	fs.dlm = lock_manager.NewLockManager()
+	fs.dlm = lock_manager.NewDistributedLockManager()
 	fs.filer.LockRing.SetTakeSnapshotCallback(fs.OnDlmChangeSnapshot)
 
 	return fs, nil