diff --git a/pkg/controller/observer_controller.go b/pkg/controller/observer_controller.go
index 1c61a874f..5e8480648 100644
--- a/pkg/controller/observer_controller.go
+++ b/pkg/controller/observer_controller.go
@@ -27,7 +27,6 @@ import (
 	"k8s.io/client-go/tools/record"
 	ctrl "sigs.k8s.io/controller-runtime"
 	"sigs.k8s.io/controller-runtime/pkg/client"
-	"sigs.k8s.io/controller-runtime/pkg/controller"
 	"sigs.k8s.io/controller-runtime/pkg/log"
 
 	v1alpha1 "github.com/oceanbase/ob-operator/api/v1alpha1"
@@ -114,7 +113,6 @@ func (r *OBServerReconciler) Reconcile(ctx context.Context, req ctrl.Request) (c
 func (r *OBServerReconciler) SetupWithManager(mgr ctrl.Manager) error {
 	return ctrl.NewControllerManagedBy(mgr).
 		For(&v1alpha1.OBServer{}).
-		WithOptions(controller.Options{MaxConcurrentReconciles: 9}).
 		WithEventFilter(preds).
 		Complete(r)
 }
diff --git a/pkg/resource/globalWhiteList.go b/pkg/resource/globalWhiteList.go
new file mode 100644
index 000000000..c0bb19ce0
--- /dev/null
+++ b/pkg/resource/globalWhiteList.go
@@ -0,0 +1,17 @@
+/*
+Copyright (c) 2023 OceanBase
+ob-operator is licensed under Mulan PSL v2.
+You can use this software according to the terms and conditions of the Mulan PSL v2.
+You may obtain a copy of Mulan PSL v2 at:
+         http://license.coscl.org.cn/MulanPSL2
+THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
+EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
+MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+See the Mulan PSL v2 for more details.
+*/
+
+package resource
+
+import "sync"
+
+var GlobalWhiteListMap sync.Map
diff --git a/pkg/resource/obtenant_manager.go b/pkg/resource/obtenant_manager.go
index 76788cd8f..c128fb818 100644
--- a/pkg/resource/obtenant_manager.go
+++ b/pkg/resource/obtenant_manager.go
@@ -51,9 +51,6 @@ type OBTenantManager struct {
 	Logger   *logr.Logger
 }
 
-// TODO add lock to be thread safe, and read/write whitelist from/to DB
-var GlobalWhiteListMap = make(map[string]string, 0)
-
 func (m *OBTenantManager) getClusterSysClient() (*operation.OceanbaseOperationManager, error) {
 	obcluster, err := m.getOBCluster()
 	if err != nil {
@@ -567,14 +564,14 @@ func (m *OBTenantManager) buildTenantStatus() (*v1alpha1.OBTenantStatus, error)
 	tenantCurrentStatus.TenantRecordInfo = v1alpha1.TenantRecordInfo{}
 	tenantCurrentStatus.TenantRecordInfo.TenantID = int(obtenant.TenantID)
 
-	// TODO get whitelist from tenant account
-	whitelist, exists := GlobalWhiteListMap[obtenant.TenantName]
+	// TODO: get whitelist from tenant account
+	whitelist, exists := GlobalWhiteListMap.Load(obtenant.TenantName)
 	if exists {
-		tenantCurrentStatus.TenantRecordInfo.ConnectWhiteList = whitelist
+		tenantCurrentStatus.TenantRecordInfo.ConnectWhiteList = whitelist.(string)
 	} else {
 		// try update whitelist after the manager restart
-		GlobalWhiteListMap[obtenant.TenantName] = tenant.DefaultOBTcpInvitedNodes
-		tenantCurrentStatus.TenantRecordInfo.ConnectWhiteList = GlobalWhiteListMap[obtenant.TenantName]
+		GlobalWhiteListMap.Store(obtenant.TenantName, tenant.DefaultOBTcpInvitedNodes)
+		tenantCurrentStatus.TenantRecordInfo.ConnectWhiteList = tenant.DefaultOBTcpInvitedNodes
 	}
 
 	tenantCurrentStatus.TenantRecordInfo.UnitNumber = poolStatusList[0].UnitNumber
diff --git a/pkg/resource/obtenant_task.go b/pkg/resource/obtenant_task.go
index a280a63ae..3008a142e 100644
--- a/pkg/resource/obtenant_task.go
+++ b/pkg/resource/obtenant_task.go
@@ -224,9 +224,9 @@ func (m *OBTenantManager) CheckAndApplyWhiteList() error {
 		if err != nil {
 			return err
 		}
-		// TODO get whitelist variable by tenant account
+		// TODO: get whitelist variable by tenant account
 		// Because getting a whitelist requires specifying a tenant , temporary use .Status.TenantRecordInfo.ConnectWhiteList as value in db
-		GlobalWhiteListMap[tenantName] = specWhiteList
+		GlobalWhiteListMap.Store(tenantName, specWhiteList)
 	}
 	return nil
 }
@@ -389,7 +389,7 @@ func (m *OBTenantManager) createTenant() error {
 		m.Recorder.Event(m.OBTenant, corev1.EventTypeWarning, "failed to create OBTenant", err.Error())
 		return err
 	}
-	GlobalWhiteListMap[tenantName] = m.OBTenant.Spec.ConnectWhiteList
+	GlobalWhiteListMap.Store(tenantName, m.OBTenant.Spec.ConnectWhiteList)
 	// Create user or change password of root, do not return error
 	m.Recorder.Event(m.OBTenant, "Create", "", "create OBTenant successfully")
 	return nil
diff --git a/pkg/resource/obtenantrestore_task.go b/pkg/resource/obtenantrestore_task.go
index 968e8122e..ffe5228e2 100644
--- a/pkg/resource/obtenantrestore_task.go
+++ b/pkg/resource/obtenantrestore_task.go
@@ -117,7 +117,7 @@ func (m *OBTenantManager) WatchRestoreJobToFinish() error {
 		}
 		time.Sleep(5 * time.Second)
 	}
-	GlobalWhiteListMap[m.OBTenant.Spec.TenantName] = m.OBTenant.Spec.ConnectWhiteList
+	GlobalWhiteListMap.Store(m.OBTenant.Spec.TenantName, m.OBTenant.Spec.ConnectWhiteList)
 	m.Recorder.Event(m.OBTenant, "RestoreJobFinished", "", "restore job finished successfully")
 	return nil
 }
diff --git a/pkg/task/task_manager.go b/pkg/task/task_manager.go
index 747f38a62..0165b214a 100644
--- a/pkg/task/task_manager.go
+++ b/pkg/task/task_manager.go
@@ -32,9 +32,7 @@ func GetTaskManager() *TaskManager {
 	taskManagerOnce.Do(func() {
 		logger := log.FromContext(context.TODO())
 		taskManager = &TaskManager{
-			ResultMap:       make(map[string]chan *TaskResult),
-			Logger:          &logger,
-			TaskResultCache: make(map[string]*TaskResult, 0),
+			Logger: &logger,
 		}
 	})
 	return taskManager
@@ -46,17 +44,17 @@ type TaskResult struct {
 }
 
 type TaskManager struct {
-	ResultMap       map[string]chan *TaskResult
+	ResultMap       sync.Map
 	Logger          *logr.Logger
-	TaskResultCache map[string]*TaskResult
+	TaskResultCache sync.Map
 }
 
 func (m *TaskManager) Submit(f func() error) string {
 	retCh := make(chan *TaskResult, 1)
 	taskId := uuid.New().String()
 	// TODO add lock to keep ResultMap safe
-	m.ResultMap[taskId] = retCh
-	m.TaskResultCache[taskId] = nil
+	m.ResultMap.Store(taskId, retCh)
+	m.TaskResultCache.Delete(taskId)
 	go func() {
 		defer func() {
 			if r := recover(); r != nil {
@@ -83,30 +81,38 @@ func (m *TaskManager) Submit(f func() error) string {
 }
 
 func (m *TaskManager) GetTaskResult(taskId string) (*TaskResult, error) {
-	retCh, exists := m.ResultMap[taskId]
+	retChAny, exists := m.ResultMap.Load(taskId)
 	if !exists {
 		return nil, errors.Errorf("Task %s not exists", taskId)
 	}
-	if m.TaskResultCache[taskId] == nil {
+	retCh, ok := retChAny.(chan *TaskResult)
+	if !ok {
+		return nil, errors.Errorf("Task %s not exists", taskId)
+	}
+	result, exists := m.TaskResultCache.Load(taskId)
+	if !exists {
 		select {
 		case result := <-retCh:
-			m.TaskResultCache[taskId] = result
+			m.TaskResultCache.Store(taskId, result)
 			return result, nil
 		default:
 			return nil, nil
 		}
-	} else {
-		return m.TaskResultCache[taskId], nil
 	}
+	return result.(*TaskResult), nil
 }
 
 func (m *TaskManager) CleanTaskResult(taskId string) error {
-	retCh, exists := m.ResultMap[taskId]
+	retChAny, exists := m.ResultMap.Load(taskId)
 	if !exists {
 		return nil
 	}
+	retCh, ok := retChAny.(chan *TaskResult)
+	if !ok {
+		return nil
+	}
 	close(retCh)
-	delete(m.ResultMap, taskId)
-	delete(m.TaskResultCache, taskId)
+	m.ResultMap.Delete(taskId)
+	m.TaskResultCache.Delete(taskId)
 	return nil
 }