From 464a71a37359e4b7ce5e101431ecbbdfe199f209 Mon Sep 17 00:00:00 2001 From: chrislu Date: Sun, 25 Jun 2023 14:14:40 -0700 Subject: [PATCH] add distributed lock manager --- other/java/client/src/main/proto/filer.proto | 2 +- .../lock_manager/distributed_lock_manager.go | 50 ++++ weed/cluster/lock_manager/lock_manager.go | 50 ++-- weed/pb/filer.proto | 2 +- weed/pb/filer_pb/filer.pb.go | 278 +++++++++--------- weed/server/filer_grpc_server_dlm.go | 46 +-- weed/server/filer_server.go | 4 +- 7 files changed, 236 insertions(+), 196 deletions(-) create mode 100644 weed/cluster/lock_manager/distributed_lock_manager.go diff --git a/other/java/client/src/main/proto/filer.proto b/other/java/client/src/main/proto/filer.proto index 3dda002c5..bd4916ddc 100644 --- a/other/java/client/src/main/proto/filer.proto +++ b/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; diff --git a/weed/cluster/lock_manager/distributed_lock_manager.go b/weed/cluster/lock_manager/distributed_lock_manager.go new file mode 100644 index 000000000..0bcc7b02d --- /dev/null +++ b/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) +} diff --git a/weed/cluster/lock_manager/lock_manager.go b/weed/cluster/lock_manager/lock_manager.go index 01dc58810..642c77772 100644 --- a/weed/cluster/lock_manager/lock_manager.go +++ b/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}) +} diff --git a/weed/pb/filer.proto b/weed/pb/filer.proto index 3dda002c5..bd4916ddc 100644 --- a/weed/pb/filer.proto +++ b/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; diff --git a/weed/pb/filer_pb/filer.pb.go b/weed/pb/filer_pb/filer.pb.go index b14c7c4f4..58d6c9287 100644 --- a/weed/pb/filer_pb/filer.pb.go +++ b/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{ 0x12, 0x14, 0x0a, 0x05, 0x65, 0x72, 0x72, 0x6f, 0x72, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x05, 0x65, 0x72, 0x72, 0x6f, 0x72, 0x12, 0x19, 0x0a, 0x08, 0x6d, 0x6f, 0x76, 0x65, 0x64, 0x5f, 0x74, 0x6f, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x07, 0x6d, 0x6f, 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a/weed/server/filer_grpc_server_dlm.go +++ b/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, }, }, }) diff --git a/weed/server/filer_server.go b/weed/server/filer_server.go index e22dfd737..adb1dd85b 100644 --- a/weed/server/filer_server.go +++ b/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