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add distributed lock manager

pull/4608/head
chrislu 2 years ago
parent
ee4f7cd636
commit
464a71a373
7 changed files with 236 additions and 196 deletions
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  1. 2
      other/java/client/src/main/proto/filer.proto
  2. 50
      weed/cluster/lock_manager/distributed_lock_manager.go
  3. 50
      weed/cluster/lock_manager/lock_manager.go
  4. 2
      weed/pb/filer.proto
  5. 278
      weed/pb/filer_pb/filer.pb.go
  6. 46
      weed/server/filer_grpc_server_dlm.go
  7. 4
      weed/server/filer_server.go

2
other/java/client/src/main/proto/filer.proto
View File

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

50
weed/cluster/lock_manager/distributed_lock_manager.go
View File

@ -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)
}

50
weed/cluster/lock_manager/lock_manager.go
View File

@ -12,9 +12,9 @@ type LockManager struct {
locks *xsync.MapOf[string, *Lock] locks *xsync.MapOf[string, *Lock]
} }
type Lock struct { 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 { func NewLockManager() *LockManager {
@ -25,32 +25,37 @@ func NewLockManager() *LockManager {
return t 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) { lm.locks.Compute(path, func(oldValue *Lock, loaded bool) (newValue *Lock, delete bool) {
if oldValue != nil { 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 // 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 { 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 { } else {
err = fmt.Errorf("lock: token mismatch") err = fmt.Errorf("lock: token mismatch")
return oldValue, false return oldValue, false
} }
} else { } else {
expirationNs := time.Now().Add(ttlDuration).UnixNano()
if token == "" { if token == "" {
// new lock
renewToken = uuid.New().String() renewToken = uuid.New().String()
return &Lock{Token: renewToken, ExpirationNs: expirationNs}, false
return &Lock{Token: renewToken, ExpiredAtNs: expiredAtNs}, false
} else { } else {
err = fmt.Errorf("lock: non-empty token on a new lock") err = fmt.Errorf("lock: non-empty token on a new lock")
return nil, false return nil, false
} }
return &Lock{Token: token, ExpirationNs: expirationNs}, false
} }
}) })
return 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) { lm.locks.Compute(path, func(oldValue *Lock, loaded bool) (newValue *Lock, delete bool) {
if oldValue != nil { if oldValue != nil {
now := time.Now() now := time.Now()
if oldValue.ExpirationNs > 0 && oldValue.ExpirationNs < now.UnixNano() {
if oldValue.ExpiredAtNs > 0 && oldValue.ExpiredAtNs < now.UnixNano() {
// lock is expired, delete it // lock is expired, delete it
isUnlocked = true isUnlocked = true
return nil, true return nil, true
} }
if oldValue.Token == token { if oldValue.Token == token {
if oldValue.ExpirationNs <= now.UnixNano() {
if oldValue.ExpiredAtNs <= now.UnixNano() {
isUnlocked = true isUnlocked = true
return nil, true return nil, true
} }
@ -89,7 +94,7 @@ func (lm *LockManager) CleanUp() {
time.Sleep(1 * time.Minute) time.Sleep(1 * time.Minute)
now := time.Now().UnixNano() now := time.Now().UnixNano()
lm.locks.Range(func(key string, value *Lock) bool { lm.locks.Range(func(key string, value *Lock) bool {
if now > value.ExpirationNs {
if now > value.ExpiredAtNs {
lm.locks.Delete(key) lm.locks.Delete(key)
return true 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 // 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() now := time.Now().UnixNano()
lm.locks.Range(func(key string, lock *Lock) bool { lm.locks.Range(func(key string, lock *Lock) bool {
if now > lock.ExpirationNs {
if now > lock.ExpiredAtNs {
lm.locks.Delete(key) lm.locks.Delete(key)
return true return true
} }
if keyFn(key) {
if selectFn(key) {
lm.locks.Delete(key) lm.locks.Delete(key)
lock.Key = key lock.Key = key
locks = append(locks, lock) locks = append(locks, lock)
@ -116,3 +121,8 @@ func (lm *LockManager) TakeOutLocksByKey(keyFn func(key string) bool) (locks []*
}) })
return 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})
}

2
weed/pb/filer.proto
View File

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

278
weed/pb/filer_pb/filer.pb.go
View File

@ -3853,9 +3853,9 @@ type Lock struct {
sizeCache protoimpl.SizeCache sizeCache protoimpl.SizeCache
unknownFields protoimpl.UnknownFields 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() { func (x *Lock) Reset() {
@ -3904,9 +3904,9 @@ func (x *Lock) GetRenewToken() string {
return "" return ""
} }
func (x *Lock) GetExpirationNs() int64 {
func (x *Lock) GetExpiredAtNs() int64 {
if x != nil { if x != nil {
return x.ExpirationNs
return x.ExpiredAtNs
} }
return 0 return 0
} }
@ -4694,146 +4694,146 @@ var file_filer_proto_rawDesc = []byte{
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} }
var ( var (

46
weed/server/filer_grpc_server_dlm.go
View File

@ -3,7 +3,6 @@ package weed_server
import ( import (
"context" "context"
"fmt" "fmt"
"github.com/seaweedfs/seaweedfs/weed/cluster/lock_manager"
"github.com/seaweedfs/seaweedfs/weed/glog" "github.com/seaweedfs/seaweedfs/weed/glog"
"github.com/seaweedfs/seaweedfs/weed/pb" "github.com/seaweedfs/seaweedfs/weed/pb"
"github.com/seaweedfs/seaweedfs/weed/pb/filer_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 { if snapshot == nil {
resp.Error = "no lock server found" resp.Error = "no lock server found"
return 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 { if err != nil {
resp.Error = fmt.Sprintf("%v", err) resp.Error = fmt.Sprintf("%v", err)
} else {
resp.RenewToken = renewToken
}
if movedTo != "" {
resp.MovedTo = string(movedTo)
} }
return resp, nil return resp, nil
@ -46,16 +41,9 @@ func (fs *FilerServer) Unlock(ctx context.Context, req *filer_pb.UnlockRequest)
if snapshot == nil { if snapshot == nil {
resp.Error = "no lock server found" resp.Error = "no lock server found"
return 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 { if err != nil {
resp.Error = fmt.Sprintf("%v", err) 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 // 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) { func (fs *FilerServer) TransferLocks(ctx context.Context, req *filer_pb.TransferLocksRequest) (*filer_pb.TransferLocksResponse, error) {
now := time.Now()
for _, lock := range req.Locks { 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 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) { 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 { if len(locks) == 0 {
return return
} }
for _, lock := range locks { 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 { if err := pb.WithFilerClient(false, 0, server, fs.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
_, err := client.TransferLocks(context.Background(), &filer_pb.TransferLocksRequest{ _, err := client.TransferLocks(context.Background(), &filer_pb.TransferLocksRequest{
Locks: []*filer_pb.Lock{ Locks: []*filer_pb.Lock{
{ {
Name: lock.Key,
RenewToken: lock.Token,
ExpirationNs: lock.ExpirationNs,
Name: lock.Key,
RenewToken: lock.Token,
ExpiredAtNs: lock.ExpiredAtNs,
}, },
}, },
}) })

4
weed/server/filer_server.go
View File

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

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