diff --git a/src/jobservice/job/impl/demo_job.go b/src/jobservice/job/impl/demo_job.go
index dd3930ddd..2be68d4b4 100644
--- a/src/jobservice/job/impl/demo_job.go
+++ b/src/jobservice/job/impl/demo_job.go
@@ -55,6 +55,7 @@ func (dj *DemoJob) Run(ctx env.JobContext, params map[string]interface{}) error
 		logger.Info("I'm finished, exit!")
 		fmt.Println("I'm finished, exit!")
 	}()
+	fmt.Println("I'm running")
 	logger.Info("=======Replication job running=======")
 	logger.Infof("params: %#v\n", params)
 	logger.Infof("context: %#v\n", ctx)
@@ -81,11 +82,12 @@ func (dj *DemoJob) Run(ctx env.JobContext, params map[string]interface{}) error
 
 	//HOLD ON FOR A WHILE
 	logger.Error("Holding for 20 sec")
-	<-time.After(10 * time.Second)
+	<-time.After(15 * time.Second)
 	//logger.Fatal("I'm back, check if I'm stopped/cancelled")
 
 	if cmd, ok := ctx.OPCommand(); ok {
 		logger.Infof("cmd=%s\n", cmd)
+		fmt.Printf("Receive OP command: %s\n", cmd)
 		if cmd == opm.CtlCommandCancel {
 			logger.Info("exit for receiving cancel signal")
 			return errs.JobCancelledError()
@@ -95,7 +97,7 @@ func (dj *DemoJob) Run(ctx env.JobContext, params map[string]interface{}) error
 		return errs.JobStoppedError()
 	}
 
-	fmt.Println("I'm here")
+	fmt.Println("I'm close to end")
 
 	return nil
 }
diff --git a/src/jobservice/opm/op_commands.go b/src/jobservice/opm/op_commands.go
new file mode 100644
index 000000000..c3668ac19
--- /dev/null
+++ b/src/jobservice/opm/op_commands.go
@@ -0,0 +1,166 @@
+// Copyright 2018 The Harbor Authors. All rights reserved.
+
+package opm
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"sync"
+	"time"
+
+	"github.com/garyburd/redigo/redis"
+	"github.com/vmware/harbor/src/jobservice/logger"
+	"github.com/vmware/harbor/src/jobservice/models"
+	"github.com/vmware/harbor/src/jobservice/utils"
+)
+
+const (
+	commandValidTime       = 5 * time.Minute
+	commandSweepTickerTime = 1 * time.Hour
+	//EventFireCommand for firing command event
+	EventFireCommand = "fire_command"
+)
+
+type oPCommand struct {
+	command  string
+	fireTime int64
+}
+
+//oPCommands maintain commands list
+type oPCommands struct {
+	lock      *sync.RWMutex
+	commands  map[string]*oPCommand
+	context   context.Context
+	redisPool *redis.Pool
+	namespace string
+	stopChan  chan struct{}
+	doneChan  chan struct{}
+}
+
+//newOPCommands is constructor of OPCommands
+func newOPCommands(ctx context.Context, ns string, redisPool *redis.Pool) *oPCommands {
+	return &oPCommands{
+		lock:      new(sync.RWMutex),
+		commands:  make(map[string]*oPCommand),
+		context:   ctx,
+		redisPool: redisPool,
+		namespace: ns,
+		stopChan:  make(chan struct{}, 1),
+		doneChan:  make(chan struct{}, 1),
+	}
+}
+
+//Start the command sweeper
+func (opc *oPCommands) Start() {
+	go opc.loop()
+	logger.Info("OP commands sweeper is started")
+}
+
+//Stop the command sweeper
+func (opc *oPCommands) Stop() {
+	opc.stopChan <- struct{}{}
+	<-opc.doneChan
+}
+
+//Fire command
+func (opc *oPCommands) Fire(jobID string, command string) error {
+	if utils.IsEmptyStr(jobID) {
+		return errors.New("empty job ID")
+	}
+
+	if command != CtlCommandStop && command != CtlCommandCancel {
+		return fmt.Errorf("Unsupported command %s", command)
+	}
+
+	notification := &models.Message{
+		Event: EventFireCommand,
+		Data:  []string{jobID, command},
+	}
+
+	rawJSON, err := json.Marshal(notification)
+	if err != nil {
+		return err
+	}
+
+	conn := opc.redisPool.Get()
+	defer conn.Close()
+
+	_, err = conn.Do("PUBLISH", utils.KeyPeriodicNotification(opc.namespace), rawJSON)
+
+	return err
+}
+
+//Push command into the list
+func (opc *oPCommands) Push(jobID string, command string) error {
+	if utils.IsEmptyStr(jobID) {
+		return errors.New("empty job ID")
+	}
+
+	if command != CtlCommandStop && command != CtlCommandCancel {
+		return fmt.Errorf("Unsupported command %s", command)
+	}
+
+	opc.lock.Lock()
+	defer opc.lock.Unlock()
+
+	opc.commands[jobID] = &oPCommand{
+		command:  command,
+		fireTime: time.Now().Unix(),
+	}
+
+	return nil
+}
+
+//Pop out the command if existing
+func (opc *oPCommands) Pop(jobID string) (string, bool) {
+	if utils.IsEmptyStr(jobID) {
+		return "", false
+	}
+
+	opc.lock.RLock()
+	defer opc.lock.RUnlock()
+
+	c, ok := opc.commands[jobID]
+	if ok {
+		if time.Unix(c.fireTime, 0).Add(commandValidTime).After(time.Now()) {
+			delete(opc.commands, jobID)
+			return c.command, true
+		}
+	}
+
+	return "", false
+}
+
+func (opc *oPCommands) loop() {
+	defer func() {
+		logger.Info("OP commands is stopped")
+		opc.doneChan <- struct{}{}
+	}()
+
+	tk := time.NewTicker(commandSweepTickerTime)
+	defer tk.Stop()
+
+	for {
+		select {
+		case <-tk.C:
+			opc.sweepCommands()
+		case <-opc.context.Done():
+			return
+		case <-opc.stopChan:
+			return
+		}
+	}
+}
+
+func (opc *oPCommands) sweepCommands() {
+	opc.lock.Lock()
+	defer opc.lock.Unlock()
+
+	for k, v := range opc.commands {
+		if time.Unix(v.fireTime, 0).Add(commandValidTime).After(time.Now()) {
+			delete(opc.commands, k)
+		}
+	}
+}
diff --git a/src/jobservice/opm/redis_job_stats_mgr.go b/src/jobservice/opm/redis_job_stats_mgr.go
index 086c21131..675413a7b 100644
--- a/src/jobservice/opm/redis_job_stats_mgr.go
+++ b/src/jobservice/opm/redis_job_stats_mgr.go
@@ -57,7 +57,8 @@ type RedisJobStatsManager struct {
 	doneChan    chan struct{}
 	processChan chan *queueItem
 	isRunning   *atomic.Value
-	hookStore   *HookStore //cache the hook here to avoid requesting backend
+	hookStore   *HookStore  //cache the hook here to avoid requesting backend
+	opCommands  *oPCommands //maintain the OP commands
 }
 
 //NewRedisJobStatsManager is constructor of RedisJobStatsManager
@@ -74,6 +75,7 @@ func NewRedisJobStatsManager(ctx context.Context, namespace string, redisPool *r
 		processChan: make(chan *queueItem, processBufferSize),
 		hookStore:   NewHookStore(),
 		isRunning:   isRunning,
+		opCommands:  newOPCommands(ctx, namespace, redisPool),
 	}
 }
 
@@ -83,6 +85,7 @@ func (rjs *RedisJobStatsManager) Start() {
 		return
 	}
 	go rjs.loop()
+	rjs.opCommands.Start()
 	rjs.isRunning.Store(true)
 
 	logger.Info("Redis job stats manager is started")
@@ -97,6 +100,8 @@ func (rjs *RedisJobStatsManager) Shutdown() {
 	if !(rjs.isRunning.Load().(bool)) {
 		return
 	}
+
+	rjs.opCommands.Stop()
 	rjs.stopChan <- struct{}{}
 	<-rjs.doneChan
 }
@@ -213,7 +218,12 @@ func (rjs *RedisJobStatsManager) SendCommand(jobID string, command string) error
 		return errors.New("unknown command")
 	}
 
-	return rjs.writeCtlCommand(jobID, command)
+	if err := rjs.opCommands.Fire(jobID, command); err != nil {
+		return err
+	}
+
+	//Directly add to op commands maintaining list
+	return rjs.opCommands.Push(jobID, command)
 }
 
 //CheckIn mesage
@@ -239,7 +249,12 @@ func (rjs *RedisJobStatsManager) CtlCommand(jobID string) (string, error) {
 		return "", errors.New("empty job ID")
 	}
 
-	return rjs.getCrlCommand(jobID)
+	c, ok := rjs.opCommands.Pop(jobID)
+	if !ok {
+		return "", fmt.Errorf("no OP command fired to job %s", jobID)
+	}
+
+	return c, nil
 }
 
 //DieAt marks the failed jobs with the time they put into dead queue.
@@ -262,7 +277,7 @@ func (rjs *RedisJobStatsManager) RegisterHook(jobID string, hookURL string, isCa
 		return errors.New("empty job ID")
 	}
 
-	if utils.IsEmptyStr(hookURL) {
+	if !utils.IsValidURL(hookURL) {
 		return errors.New("invalid hook url")
 	}
 
@@ -302,7 +317,7 @@ func (rjs *RedisJobStatsManager) submitStatusReportingItem(jobID string, status,
 		if !ok {
 			//Retrieve from backend
 			hookURL, err = rjs.getHook(jobID)
-			if err != nil {
+			if err != nil || !utils.IsValidURL(hookURL) {
 				//logged and exit
 				logger.Warningf("no status hook found for job %s\n, abandon status reporting", jobID)
 				return
@@ -328,45 +343,6 @@ func (rjs *RedisJobStatsManager) reportStatus(jobID string, hookURL, status, che
 	return DefaultHookClient.ReportStatus(hookURL, reportingStatus)
 }
 
-func (rjs *RedisJobStatsManager) getCrlCommand(jobID string) (string, error) {
-	conn := rjs.redisPool.Get()
-	defer conn.Close()
-
-	key := utils.KeyJobCtlCommands(rjs.namespace, jobID)
-	cmd, err := redis.String(conn.Do("HGET", key, "command"))
-	if err != nil {
-		return "", err
-	}
-	//try to DEL it after getting the command
-	//Ignore the error,leave it as dirty data
-	_, err = conn.Do("DEL", key)
-	if err != nil {
-		//only logged
-		logger.Errorf("del key %s failed with error: %s\n", key, err)
-	}
-
-	return cmd, nil
-}
-
-func (rjs *RedisJobStatsManager) writeCtlCommand(jobID string, command string) error {
-	conn := rjs.redisPool.Get()
-	defer conn.Close()
-
-	key := utils.KeyJobCtlCommands(rjs.namespace, jobID)
-	args := make([]interface{}, 0, 5)
-	args = append(args, key, "command", command, "fire_time", time.Now().Unix())
-	if err := conn.Send("HMSET", args...); err != nil {
-		return err
-	}
-
-	expireTime := 24*60*60 + rand.Int63n(10)
-	if err := conn.Send("EXPIRE", key, expireTime); err != nil {
-		return err
-	}
-
-	return conn.Flush()
-}
-
 func (rjs *RedisJobStatsManager) updateJobStatus(jobID string, status string) error {
 	conn := rjs.redisPool.Get()
 	defer conn.Close()
diff --git a/src/jobservice/opm/redis_job_stats_mgr_test.go b/src/jobservice/opm/redis_job_stats_mgr_test.go
index 59e6d188f..a5c5cc8cb 100644
--- a/src/jobservice/opm/redis_job_stats_mgr_test.go
+++ b/src/jobservice/opm/redis_job_stats_mgr_test.go
@@ -87,11 +87,6 @@ func TestCommand(t *testing.T) {
 			t.Fatalf("expect '%s' but got '%s'", CtlCommandStop, cmd)
 		}
 	}
-
-	key := utils.KeyJobCtlCommands(testingNamespace, "fake_job_ID")
-	if err := clear(key, redisPool.Get()); err != nil {
-		t.Fatal(err)
-	}
 }
 
 func TestDieAt(t *testing.T) {
diff --git a/src/jobservice/period/redis_scheduler.go b/src/jobservice/period/redis_scheduler.go
index 3b74cc19f..7f80c35b4 100644
--- a/src/jobservice/period/redis_scheduler.go
+++ b/src/jobservice/period/redis_scheduler.go
@@ -9,6 +9,8 @@ import (
 	"sync"
 	"time"
 
+	"github.com/vmware/harbor/src/jobservice/errs"
+
 	"github.com/robfig/cron"
 
 	"github.com/garyburd/redigo/redis"
@@ -156,6 +158,10 @@ func (rps *RedisPeriodicScheduler) UnSchedule(cronJobPolicyID string) error {
 	}
 
 	score, err := rps.getScoreByID(cronJobPolicyID)
+	if err == redis.ErrNil {
+		return errs.NoObjectFoundError(err.Error())
+	}
+
 	if err != nil {
 		return err
 	}
diff --git a/src/jobservice/pool/message_server.go b/src/jobservice/pool/message_server.go
index 05f91d368..471cff980 100644
--- a/src/jobservice/pool/message_server.go
+++ b/src/jobservice/pool/message_server.go
@@ -89,6 +89,9 @@ func (ms *MessageServer) Start() error {
 						dt, _ := json.Marshal(m.Data)
 						json.Unmarshal(dt, hookObject)
 						converted = hookObject
+					case opm.EventFireCommand:
+						//no need to convert []string
+						converted = m.Data
 					}
 					res := callback.Call([]reflect.Value{reflect.ValueOf(converted)})
 					e := res[0].Interface()
diff --git a/src/jobservice/pool/message_server_test.go b/src/jobservice/pool/message_server_test.go
index d53efb6d0..6ba5e38cd 100644
--- a/src/jobservice/pool/message_server_test.go
+++ b/src/jobservice/pool/message_server_test.go
@@ -5,6 +5,7 @@ import (
 	"context"
 	"encoding/json"
 	"errors"
+	"fmt"
 	"testing"
 	"time"
 
@@ -141,6 +142,56 @@ func TestPublishHook(t *testing.T) {
 	ms.Start()
 }
 
+func TestPublishCommands(t *testing.T) {
+	ms, cancel := createMessageServer()
+	err := ms.Subscribe(opm.EventFireCommand, func(data interface{}) error {
+		cmds, ok := data.([]string)
+		if !ok {
+			t.Fatal("expect fired command but got other thing")
+			return errors.New("expect fired command but got other thing")
+		}
+		if len(cmds) != 2 {
+			t.Fatalf("expect a array with 2 items but only got '%d' items", len(cmds))
+			return fmt.Errorf("expect a array with 2 items but only got '%d' items", len(cmds))
+		}
+		if cmds[1] != "stop" {
+			t.Fatalf("expect command 'stop' but got '%s'", cmds[1])
+			return fmt.Errorf("expect command 'stop' but got '%s'", cmds[1])
+		}
+		return nil
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	go func() {
+		defer cancel()
+		<-time.After(200 * time.Millisecond)
+
+		notification := &models.Message{
+			Event: opm.EventRegisterStatusHook,
+			Data:  []string{"fake_job_ID", "stop"},
+		}
+
+		rawJSON, err := json.Marshal(notification)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		conn := redisPool.Get()
+		defer conn.Close()
+		err = conn.Send("PUBLISH", utils.KeyPeriodicNotification(tests.GiveMeTestNamespace()), rawJSON)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		//hold for a while
+		<-time.After(200 * time.Millisecond)
+	}()
+
+	ms.Start()
+}
+
 func createMessageServer() (*MessageServer, context.CancelFunc) {
 	ns := tests.GiveMeTestNamespace()
 	ctx, cancel := context.WithCancel(context.Background())
diff --git a/src/jobservice/pool/redis_pool.go b/src/jobservice/pool/redis_pool.go
index efc1c4fd8..384b96d3e 100644
--- a/src/jobservice/pool/redis_pool.go
+++ b/src/jobservice/pool/redis_pool.go
@@ -123,6 +123,12 @@ func (gcwp *GoCraftWorkPool) Start() {
 			}); err != nil {
 			return
 		}
+		if err = gcwp.messageServer.Subscribe(opm.EventFireCommand,
+			func(data interface{}) error {
+				return gcwp.handleOPCommandFiring(data)
+			}); err != nil {
+			return
+		}
 
 		//Start message server
 		if err = gcwp.messageServer.Start(); err != nil {
@@ -323,8 +329,6 @@ func (gcwp *GoCraftWorkPool) Stats() (models.JobPoolStats, error) {
 		return models.JobPoolStats{}, err
 	}
 
-	fmt.Printf("hbs=%+#v\n", hbs[0])
-
 	//Find the heartbeat of this pool via pid
 	stats := make([]*models.JobPoolStatsData, 0)
 	for _, hb := range hbs {
@@ -367,9 +371,14 @@ func (gcwp *GoCraftWorkPool) StopJob(jobID string) error {
 		return err
 	}
 
+	needSetStopStatus := false
+
 	switch theJob.Stats.JobKind {
 	case job.JobKindGeneric:
-		//nothing need to do
+		//Only running job can be stopped
+		if theJob.Stats.Status != job.JobStatusRunning {
+			return fmt.Errorf("job '%s' is not a running job", jobID)
+		}
 	case job.JobKindScheduled:
 		//we need to delete the scheduled job in the queue if it is not running yet
 		//otherwise, nothing need to do
@@ -377,6 +386,7 @@ func (gcwp *GoCraftWorkPool) StopJob(jobID string) error {
 			if err := gcwp.client.DeleteScheduledJob(theJob.Stats.RunAt, jobID); err != nil {
 				return err
 			}
+			needSetStopStatus = true
 		}
 	case job.JobKindPeriodic:
 		//firstly delete the periodic job policy
@@ -390,6 +400,8 @@ func (gcwp *GoCraftWorkPool) StopJob(jobID string) error {
 			//only logged
 			logger.Errorf("Expire the stats of job %s failed with error: %s\n", theJob.Stats.JobID, err)
 		}
+
+		needSetStopStatus = true
 	default:
 		break
 	}
@@ -400,6 +412,13 @@ func (gcwp *GoCraftWorkPool) StopJob(jobID string) error {
 		if err := gcwp.statsManager.SendCommand(jobID, opm.CtlCommandStop); err != nil {
 			return err
 		}
+		//The job running instance will set the status to 'stopped'
+		needSetStopStatus = false
+	}
+
+	//If needed, update the job status to 'stopped'
+	if needSetStopStatus {
+		gcwp.statsManager.SetJobStatus(jobID, job.JobStatusStopped)
 	}
 
 	return nil
@@ -475,8 +494,8 @@ func (gcwp *GoCraftWorkPool) RegisterHook(jobID string, hookURL string) error {
 		return errors.New("empty job ID")
 	}
 
-	if utils.IsEmptyStr(hookURL) {
-		return errors.New("empty hook url")
+	if !utils.IsValidURL(hookURL) {
+		return errors.New("invalid hook url")
 	}
 
 	return gcwp.statsManager.RegisterHook(jobID, hookURL, false)
@@ -550,6 +569,24 @@ func (gcwp *GoCraftWorkPool) handleRegisterStatusHook(data interface{}) error {
 	return gcwp.statsManager.RegisterHook(hook.JobID, hook.HookURL, true)
 }
 
+func (gcwp *GoCraftWorkPool) handleOPCommandFiring(data interface{}) error {
+	if data == nil {
+		return errors.New("nil data interface")
+	}
+
+	commands, ok := data.([]interface{})
+	if !ok || len(commands) != 2 {
+		return errors.New("malformed op commands object")
+	}
+	jobID, ok := commands[0].(string)
+	command, ok := commands[1].(string)
+	if !ok {
+		return errors.New("malformed op command info")
+	}
+
+	return gcwp.statsManager.SendCommand(jobID, command)
+}
+
 //log the job
 func (rpc *RedisPoolContext) logJob(job *work.Job, next work.NextMiddlewareFunc) error {
 	logger.Infof("Job incoming: %s:%s", job.Name, job.ID)
diff --git a/src/jobservice/utils/utils.go b/src/jobservice/utils/utils.go
index 7fcfaa185..db34310b2 100644
--- a/src/jobservice/utils/utils.go
+++ b/src/jobservice/utils/utils.go
@@ -5,6 +5,7 @@ package utils
 
 import (
 	"errors"
+	"net/url"
 	"os"
 	"strings"
 
@@ -57,6 +58,19 @@ func IsValidPort(port uint) bool {
 	return port != 0 && port < 65536
 }
 
+//IsValidURL validates if the url is well-formted
+func IsValidURL(address string) bool {
+	if IsEmptyStr(address) {
+		return false
+	}
+
+	if _, err := url.Parse(address); err != nil {
+		return false
+	}
+
+	return true
+}
+
 //JobScore represents the data item with score in the redis db.
 type JobScore struct {
 	JobBytes []byte
diff --git a/src/replication/target/target.go b/src/replication/target/target.go
index 2452a0039..ede441de1 100644
--- a/src/replication/target/target.go
+++ b/src/replication/target/target.go
@@ -15,6 +15,8 @@
 package target
 
 import (
+	"fmt"
+
 	"github.com/vmware/harbor/src/common/dao"
 	"github.com/vmware/harbor/src/common/models"
 	"github.com/vmware/harbor/src/common/utils"
@@ -42,7 +44,7 @@ func (d *DefaultManager) GetTarget(id int64) (*models.RepTarget, error) {
 	}
 
 	if target == nil {
-		return nil, nil
+		return nil, fmt.Errorf("target '%d' does not exist", id)
 	}
 
 	// decrypt the password