diff --git a/ci/jenkinsfile/publish_docker.groovy b/ci/jenkinsfile/publish_docker.groovy
index d43b06c9d3..cb8e686310 100644
--- a/ci/jenkinsfile/publish_docker.groovy
+++ b/ci/jenkinsfile/publish_docker.groovy
@@ -8,7 +8,7 @@ container('publish-docker') {
                         sh "curl -O -u anonymous: ftp://192.168.1.126/data/${PROJECT_NAME}/engine/${JOB_NAME}-${BUILD_ID}/${PROJECT_NAME}-engine-${PACKAGE_VERSION}.tar.gz"
                         sh "tar zxvf ${PROJECT_NAME}-engine-${PACKAGE_VERSION}.tar.gz"
                         try {
-                            docker.withRegistry('https://registry.zilliz.com', 'a54e38ef-c424-4ea9-9224-b25fc20e3924') {
+                            docker.withRegistry('https://registry.zilliz.com', '${params.DOCKER_PUBLISH_USER}') {
                                 def customImage = docker.build("${PROJECT_NAME}/engine:${DOCKER_VERSION}")
                                 customImage.push()
                             }
diff --git a/cpp/CHANGELOG.md b/cpp/CHANGELOG.md
index 6f1c49e9f4..e0f3b1de25 100644
--- a/cpp/CHANGELOG.md
+++ b/cpp/CHANGELOG.md
@@ -16,6 +16,22 @@ Please mark all change in change log and use the ticket from JIRA.
 - MS-350 - Remove knowhere submodule
 - MS-354 - Add task class and interface in scheduler
 - MS-355 - Add copy interface in ExcutionEngine
+- MS-357 - Add minimum schedule function
+- MS-359 - Add cost test in new scheduler
+- MS-361 - Add event in resource
+- MS-364 - Modify tasktableitem in tasktable
+- MS-365 - Use tasktableitemptr instead in event
+- MS-366 - Implement TaskTable
+- MS-368 - Implement cost.cpp
+- MS-371 - Add TaskTableUpdatedEvent
+- MS-373 - Add resource test
+- MS-374 - Add action definition
+- MS-375 - Add Dump implementation for Event
+- MS-376 - Add loader and executor enable flag in Resource avoid diskresource execute task
+- MS-377 - Improve process thread trigger in ResourceMgr, Scheduler and TaskTable
+- MS-378 - Debug and Update normal_test in scheduler unittest
+- MS-379 - Add Dump implementation in Resource
+- MS-380 - Update resource loader and executor, work util all finished
 
 ## New Feature
 - MS-343 - Implement ResourceMgr
diff --git a/cpp/src/db/meta/SqliteMetaImpl.cpp b/cpp/src/db/meta/SqliteMetaImpl.cpp
index 9411a5e82b..9053139e0b 100644
--- a/cpp/src/db/meta/SqliteMetaImpl.cpp
+++ b/cpp/src/db/meta/SqliteMetaImpl.cpp
@@ -606,9 +606,9 @@ Status SqliteMetaImpl::FilesToSearch(const std::string &table_id,
                                       &TableFileSchema::engine_type_);
 
         auto match_tableid = c(&TableFileSchema::table_id_) == table_id;
-        auto is_raw = c(&TableFileSchema::file_type_) == (int) TableFileSchema::RAW;
-        auto is_toindex = c(&TableFileSchema::file_type_) == (int) TableFileSchema::TO_INDEX;
-        auto is_index = c(&TableFileSchema::file_type_) == (int) TableFileSchema::INDEX;
+
+        std::vector<int> file_type = {(int) TableFileSchema::RAW, (int) TableFileSchema::TO_INDEX, (int) TableFileSchema::INDEX};
+        auto match_type = in(&TableFileSchema::file_type_, file_type);
 
         TableSchema table_schema;
         table_schema.table_id_ = table_id;
@@ -617,23 +617,23 @@ Status SqliteMetaImpl::FilesToSearch(const std::string &table_id,
 
         decltype(ConnectorPtr->select(select_columns)) result;
         if (partition.empty() && ids.empty()) {
-            auto filter = where(match_tableid and (is_raw or is_toindex or is_index));
+            auto filter = where(match_tableid and match_type);
             result = ConnectorPtr->select(select_columns, filter);
         }
         else if (partition.empty() && !ids.empty()) {
             auto match_fileid = in(&TableFileSchema::id_, ids);
-            auto filter = where(match_tableid and match_fileid and (is_raw or is_toindex or is_index));
+            auto filter = where(match_tableid and match_fileid and match_type);
             result = ConnectorPtr->select(select_columns, filter);
         }
         else if (!partition.empty() && ids.empty()) {
             auto match_date = in(&TableFileSchema::date_, partition);
-            auto filter = where(match_tableid and match_date and (is_raw or is_toindex or is_index));
+            auto filter = where(match_tableid and match_date and match_type);
             result = ConnectorPtr->select(select_columns, filter);
         }
         else if (!partition.empty() && !ids.empty()) {
             auto match_fileid = in(&TableFileSchema::id_, ids);
             auto match_date = in(&TableFileSchema::date_, partition);
-            auto filter = where(match_tableid and match_fileid and match_date and (is_raw or is_toindex or is_index));
+            auto filter = where(match_tableid and match_fileid and match_date and match_type);
             result = ConnectorPtr->select(select_columns, filter);
         }
 
diff --git a/cpp/src/scheduler/Cost.cpp b/cpp/src/scheduler/Cost.cpp
index 0f7c30c6a7..724a717d2f 100644
--- a/cpp/src/scheduler/Cost.cpp
+++ b/cpp/src/scheduler/Cost.cpp
@@ -12,22 +12,40 @@ namespace milvus {
 namespace engine {
 
 std::vector<uint64_t>
-PickToMove(const TaskTable &task_table, const CacheMgr &cache_mgr, double limit) {
+PickToMove(TaskTable &task_table, const CacheMgr &cache_mgr, uint64_t limit) {
     std::vector<uint64_t> indexes;
+    for (uint64_t i = 0, count = 0; i < task_table.Size() && count < limit; ++i) {
+        if (task_table[i]->state == TaskTableItemState::LOADED) {
+            indexes.push_back(i);
+            ++count;
+        }
+    }
     return indexes;
 }
 
 
 std::vector<uint64_t>
-PickToLoad(const TaskTable &task_table, uint64_t limit) {
+PickToLoad(TaskTable &task_table, uint64_t limit) {
     std::vector<uint64_t> indexes;
+    for (uint64_t i = 0, count = 0; i < task_table.Size() && count < limit; ++i) {
+        if (task_table[i]->state == TaskTableItemState::START) {
+            indexes.push_back(i);
+            ++count;
+        }
+    }
     return indexes;
 }
 
 
 std::vector<uint64_t>
-PickToExecute(const TaskTable &task_table, uint64_t limit) {
+PickToExecute(TaskTable &task_table, uint64_t limit) {
     std::vector<uint64_t> indexes;
+    for (uint64_t i = 0, count = 0; i < task_table.Size() && count < limit; ++i) {
+        if (task_table[i]->state == TaskTableItemState::LOADED) {
+            indexes.push_back(i);
+            ++count;
+        }
+    }
     return indexes;
 }
 
diff --git a/cpp/src/scheduler/Cost.h b/cpp/src/scheduler/Cost.h
index 98de9d8fc1..76f16d4d1d 100644
--- a/cpp/src/scheduler/Cost.h
+++ b/cpp/src/scheduler/Cost.h
@@ -23,7 +23,7 @@ namespace engine {
  * call from scheduler;
  */
 std::vector<uint64_t>
-PickToMove(const TaskTable &task_table, const CacheMgr &cache_mgr, double limit);
+PickToMove(TaskTable &task_table, const CacheMgr &cache_mgr, uint64_t limit);
 
 
 /*
@@ -32,7 +32,7 @@ PickToMove(const TaskTable &task_table, const CacheMgr &cache_mgr, double limit)
  * I DONT SURE NEED THIS;
  */
 std::vector<uint64_t>
-PickToLoad(const TaskTable &task_table, uint64_t limit);
+PickToLoad(TaskTable &task_table, uint64_t limit);
 
 /*
  * select task to execute;
@@ -40,7 +40,7 @@ PickToLoad(const TaskTable &task_table, uint64_t limit);
  * I DONT SURE NEED THIS;
  */
 std::vector<uint64_t>
-PickToExecute(const TaskTable &task_table, uint64_t limit);
+PickToExecute(TaskTable &task_table, uint64_t limit);
 
 
 }
diff --git a/cpp/src/scheduler/ResourceMgr.cpp b/cpp/src/scheduler/ResourceMgr.cpp
index b24e08a413..916aaa238a 100644
--- a/cpp/src/scheduler/ResourceMgr.cpp
+++ b/cpp/src/scheduler/ResourceMgr.cpp
@@ -7,6 +7,7 @@
 #include "ResourceMgr.h"
 #include "db/Log.h"
 
+
 namespace zilliz {
 namespace milvus {
 namespace engine {
@@ -21,30 +22,18 @@ ResourceMgr::Add(ResourcePtr &&resource) {
     ResourceWPtr ret(resource);
 
     std::lock_guard<std::mutex> lck(resources_mutex_);
-    if(running_) {
+    if (running_) {
         ENGINE_LOG_ERROR << "ResourceMgr is running, not allow to add resource";
         return ret;
     }
 
+    if (resource->Type() == ResourceType::DISK) {
+        disk_resources_.emplace_back(ResourceWPtr(resource));
+    }
     resources_.emplace_back(resource);
 
     size_t index = resources_.size() - 1;
-    resource->RegisterOnStartUp([&] {
-        start_up_event_[index] = true;
-        event_cv_.notify_one();
-    });
-    resource->RegisterOnFinishTask([&] {
-        finish_task_event_[index] = true;
-        event_cv_.notify_one();
-    });
-    resource->RegisterOnCopyCompleted([&] {
-        copy_completed_event_[index] = true;
-        event_cv_.notify_one();
-    });
-    resource->RegisterOnTaskTableUpdated([&] {
-        task_table_updated_event_[index] = true;
-        event_cv_.notify_one();
-    });
+    resource->RegisterSubscriber(std::bind(&ResourceMgr::PostEvent, this, std::placeholders::_1));
     return ret;
 }
 
@@ -53,41 +42,11 @@ ResourceMgr::Connect(ResourceWPtr &res1, ResourceWPtr &res2, Connection &connect
     if (auto observe_a = res1.lock()) {
         if (auto observe_b = res2.lock()) {
             observe_a->AddNeighbour(std::static_pointer_cast<Node>(observe_b), connection);
+            observe_b->AddNeighbour(std::static_pointer_cast<Node>(observe_a), connection);
         }
     }
 }
 
-void
-ResourceMgr::EventProcess() {
-    while (running_) {
-        std::unique_lock <std::mutex> lock(resources_mutex_);
-        event_cv_.wait(lock, [this] { return !resources_.empty(); });
-
-        if(!running_) {
-            break;
-        }
-
-        for (uint64_t i = 0; i < resources_.size(); ++i) {
-            ResourceWPtr res(resources_[i]);
-            if (start_up_event_[i]) {
-                on_start_up_(res);
-                start_up_event_[i] = false;
-            }
-            if (finish_task_event_[i]) {
-                on_finish_task_(res);
-                finish_task_event_[i] = false;
-            }
-            if (copy_completed_event_[i]) {
-                on_copy_completed_(res);
-                copy_completed_event_[i] = false;
-            }
-            if (task_table_updated_event_[i]) {
-                on_task_table_updated_(res);
-                task_table_updated_event_[i] = false;
-            }
-        }
-    }
-}
 
 void
 ResourceMgr::Start() {
@@ -95,23 +54,33 @@ ResourceMgr::Start() {
     for (auto &resource : resources_) {
         resource->Start();
     }
-    worker_thread_ = std::thread(&ResourceMgr::EventProcess, this);
-
     running_ = true;
+    worker_thread_ = std::thread(&ResourceMgr::event_process, this);
 }
 
 void
 ResourceMgr::Stop() {
-    std::lock_guard<std::mutex> lck(resources_mutex_);
-
-    running_ = false;
+    {
+        std::lock_guard<std::mutex> lock(event_mutex_);
+        running_ = false;
+        queue_.push(nullptr);
+        event_cv_.notify_one();
+    }
     worker_thread_.join();
 
+    std::lock_guard<std::mutex> lck(resources_mutex_);
     for (auto &resource : resources_) {
         resource->Stop();
     }
 }
 
+void
+ResourceMgr::PostEvent(const EventPtr &event) {
+    std::unique_lock<std::mutex> lock(event_mutex_);
+    queue_.emplace(event);
+    event_cv_.notify_one();
+}
+
 std::string
 ResourceMgr::Dump() {
     std::string str = "ResourceMgr contains " + std::to_string(resources_.size()) + " resources.\n";
@@ -124,6 +93,26 @@ ResourceMgr::Dump() {
     return str;
 }
 
+void
+ResourceMgr::event_process() {
+    while (running_) {
+        std::unique_lock<std::mutex> lock(event_mutex_);
+        event_cv_.wait(lock, [this] { return !queue_.empty(); });
+
+        auto event = queue_.front();
+        if (event == nullptr) {
+            break;
+        }
+
+//        ENGINE_LOG_DEBUG << "ResourceMgr process " << *event;
+
+        queue_.pop();
+        if (subscriber_) {
+            subscriber_(event);
+        }
+    }
+}
+
 }
 }
 }
diff --git a/cpp/src/scheduler/ResourceMgr.h b/cpp/src/scheduler/ResourceMgr.h
index e7a7650695..cb2e631935 100644
--- a/cpp/src/scheduler/ResourceMgr.h
+++ b/cpp/src/scheduler/ResourceMgr.h
@@ -10,9 +10,12 @@
 #include <vector>
 #include <memory>
 #include <mutex>
+#include <queue>
 #include <condition_variable>
 
 #include "resource/Resource.h"
+#include "utils/Log.h"
+
 
 namespace zilliz {
 namespace milvus {
@@ -23,6 +26,15 @@ public:
     ResourceMgr();
 
     /******** Management Interface ********/
+    inline void
+    RegisterSubscriber(std::function<void(EventPtr)> subscriber) {
+        subscriber_ = std::move(subscriber);
+    }
+
+    std::vector<ResourceWPtr> &
+    GetDiskResources() {
+        return disk_resources_;
+    }
 
     /*
      * Add resource into Resource Management;
@@ -48,44 +60,11 @@ public:
     void
     Stop();
 
+    void
+    PostEvent(const EventPtr& event);
 
     // TODO: add stats interface(low)
 
-public:
-    /******** Event Register Interface ********/
-
-    /*
-     * Register on start up event;
-     */
-    void
-    RegisterOnStartUp(std::function<void(ResourceWPtr)> &func) {
-        on_start_up_ = func;
-    }
-
-    /*
-     * Register on finish one task event;
-     */
-    void
-    RegisterOnFinishTask(std::function<void(ResourceWPtr)> &func) {
-        on_finish_task_ = func;
-    }
-
-    /*
-     * Register on copy task data completed event;
-     */
-    void
-    RegisterOnCopyCompleted(std::function<void(ResourceWPtr)> &func) {
-        on_copy_completed_ = func;
-    }
-
-    /*
-     * Register on task table updated event;
-     */
-    void
-    RegisterOnTaskTableUpdated(std::function<void(ResourceWPtr)> &func) {
-        on_task_table_updated_ = func;
-    }
-
 public:
     /******** Utlitity Functions ********/
 
@@ -94,27 +73,25 @@ public:
 
 private:
     void
-    EventProcess();
+    event_process();
 
 private:
+    std::queue<EventPtr> queue_;
+    std::function<void(EventPtr)> subscriber_ = nullptr;
+
     bool running_;
 
+    std::vector<ResourceWPtr> disk_resources_;
     std::vector<ResourcePtr> resources_;
     mutable std::mutex resources_mutex_;
     std::thread worker_thread_;
 
+    std::mutex event_mutex_;
     std::condition_variable event_cv_;
-    std::vector<bool> start_up_event_;
-    std::vector<bool> finish_task_event_;
-    std::vector<bool> copy_completed_event_;
-    std::vector<bool> task_table_updated_event_;
 
-    std::function<void(ResourceWPtr)> on_start_up_;
-    std::function<void(ResourceWPtr)> on_finish_task_;
-    std::function<void(ResourceWPtr)> on_copy_completed_;
-    std::function<void(ResourceWPtr)> on_task_table_updated_;
 };
 
+using ResourceMgrPtr = std::shared_ptr<ResourceMgr>;
 using ResourceMgrWPtr = std::weak_ptr<ResourceMgr>;
 
 }
diff --git a/cpp/src/scheduler/Scheduler.cpp b/cpp/src/scheduler/Scheduler.cpp
index c5ae928166..191d1957aa 100644
--- a/cpp/src/scheduler/Scheduler.cpp
+++ b/cpp/src/scheduler/Scheduler.cpp
@@ -5,40 +5,46 @@
  ******************************************************************************/
 
 #include "Scheduler.h"
+#include "Cost.h"
+#include "action/Action.h"
 
 
 namespace zilliz {
 namespace milvus {
 namespace engine {
 
-void
-StartUpEvent::Process() {
-
-}
-
-void
-FinishTaskEvent::Process() {
-//        for (nei : res->neighbours) {
-//            tasks = cost(nei->task_table(), nei->connection, limit = 3)
-//            res->task_table()->PutTasks(tasks);
-//        }
-//        res->WakeUpExec();
-}
-
-void
-CopyCompletedEvent::Process() {
-
-}
-
-void
-TaskTableUpdatedEvent::Process() {
-
+Scheduler::Scheduler(ResourceMgrWPtr res_mgr)
+    : running_(false),
+      res_mgr_(std::move(res_mgr)) {
+    if (auto mgr = res_mgr_.lock()) {
+        mgr->RegisterSubscriber(std::bind(&Scheduler::PostEvent, this, std::placeholders::_1));
+    }
 }
 
 
 void
 Scheduler::Start() {
-    worker_thread_ = std::thread(&Scheduler::worker_thread_, this);
+    running_ = true;
+    worker_thread_ = std::thread(&Scheduler::worker_function, this);
+}
+
+void
+Scheduler::Stop() {
+    {
+        std::lock_guard<std::mutex> lock(event_mutex_);
+        running_ = false;
+        event_queue_.push(nullptr);
+        event_cv_.notify_one();
+    }
+    worker_thread_.join();
+}
+
+void
+Scheduler::PostEvent(const EventPtr &event) {
+    std::lock_guard<std::mutex> lock(event_mutex_);
+    event_queue_.push(event);
+    event_cv_.notify_one();
+//    SERVER_LOG_DEBUG << "Scheduler post " << *event;
 }
 
 std::string
@@ -49,8 +55,76 @@ Scheduler::Dump() {
 void
 Scheduler::worker_function() {
     while (running_) {
+        std::unique_lock<std::mutex> lock(event_mutex_);
+        event_cv_.wait(lock, [this] { return !event_queue_.empty(); });
         auto event = event_queue_.front();
-        event->Process();
+        if (event == nullptr) {
+            break;
+        }
+
+//        SERVER_LOG_DEBUG << "Scheduler process " << *event;
+        event_queue_.pop();
+        Process(event);
+    }
+}
+
+void
+Scheduler::Process(const EventPtr &event) {
+    switch (event->Type()) {
+        case EventType::START_UP: {
+            OnStartUp(event);
+            break;
+        }
+        case EventType::COPY_COMPLETED: {
+            OnCopyCompleted(event);
+            break;
+        }
+        case EventType::FINISH_TASK: {
+            OnFinishTask(event);
+            break;
+        }
+        case EventType::TASK_TABLE_UPDATED: {
+            OnTaskTableUpdated(event);
+            break;
+        }
+        default: {
+            // TODO: logging
+            break;
+        }
+    }
+}
+
+
+void
+Scheduler::OnStartUp(const EventPtr &event) {
+    if (auto resource = event->resource_.lock()) {
+        resource->WakeupLoader();
+    }
+}
+
+void
+Scheduler::OnFinishTask(const EventPtr &event) {
+    if (auto resource = event->resource_.lock()) {
+        resource->WakeupExecutor();
+    }
+}
+
+void
+Scheduler::OnCopyCompleted(const EventPtr &event) {
+    if (auto resource = event->resource_.lock()) {
+        resource->WakeupLoader();
+        resource->WakeupExecutor();
+        if (resource->Type()== ResourceType::DISK) {
+            Action::PushTaskToNeighbour(event->resource_);
+        }
+    }
+}
+
+void
+Scheduler::OnTaskTableUpdated(const EventPtr &event) {
+//    Action::PushTaskToNeighbour(event->resource_);
+    if (auto resource = event->resource_.lock()) {
+        resource->WakeupLoader();
     }
 }
 
diff --git a/cpp/src/scheduler/Scheduler.h b/cpp/src/scheduler/Scheduler.h
index 152937a1d2..012a479a82 100644
--- a/cpp/src/scheduler/Scheduler.h
+++ b/cpp/src/scheduler/Scheduler.h
@@ -5,6 +5,7 @@
  ******************************************************************************/
 #pragma once
 
+#include <memory>
 #include <string>
 #include <mutex>
 #include <thread>
@@ -12,128 +13,93 @@
 
 #include "resource/Resource.h"
 #include "ResourceMgr.h"
+#include "utils/Log.h"
 
 
 namespace zilliz {
 namespace milvus {
 namespace engine {
 
-class Event {
-public:
-    explicit
-    Event(ResourceWPtr &resource) : resource_(resource) {}
-
-public:
-    virtual void
-    Process() = 0;
-
-private:
-    ResourceWPtr resource_;
-};
-
-using EventPtr = std::shared_ptr<Event>;
-
-class StartUpEvent : public Event {
-public:
-    explicit
-    StartUpEvent(ResourceWPtr &resource) : Event(resource) {}
-
-public:
-    void
-    Process() override;
-};
-
-class FinishTaskEvent : public Event {
-public:
-    explicit
-    FinishTaskEvent(ResourceWPtr &resource) : Event(resource) {}
-
-public:
-    void
-    Process() override;
-};
-
-class CopyCompletedEvent : public Event {
-public:
-    explicit
-    CopyCompletedEvent(ResourceWPtr &resource) : Event(resource) {}
-
-public:
-    void
-    Process() override;
-};
-
-class TaskTableUpdatedEvent : public Event {
-public:
-    explicit
-    TaskTableUpdatedEvent(ResourceWPtr &resource) : Event(resource) {}
-
-public:
-    void
-    Process() override;
-};
 
 class Scheduler {
 public:
     explicit
-    Scheduler(ResourceMgrWPtr res_mgr)
-        : running_(false),
-          res_mgr_(std::move(res_mgr)) {
-//        res_mgr.Register();
-//        res_mgr.Register();
-//        res_mgr.Register();
-//        res_mgr.Register();
-    }
+    Scheduler(ResourceMgrWPtr res_mgr);
 
+    Scheduler(const Scheduler &) = delete;
+    Scheduler(Scheduler &&) = delete;
+
+    /*
+     * Start worker thread;
+     */
     void
     Start();
 
-public:
+    /*
+     * Stop worker thread, join it;
+     */
+    void
+    Stop();
+
+    /*
+     * Post event to scheduler event queue;
+     */
+    void
+    PostEvent(const EventPtr &event);
+
+    /*
+     * Dump as string;
+     */
+    std::string
+    Dump();
+
+private:
     /******** Events ********/
 
     /*
      * Process start up events;
+     *
+     * Actions:
+     * Pull task from neighbours;
      */
-    inline void
-    OnStartUp(ResourceWPtr &resource) {
-        auto event = std::make_shared<StartUpEvent>(resource);
-        event_queue_.push(event);
-    }
+    void
+    OnStartUp(const EventPtr &event);
 
     /*
      * Process finish task events;
+     *
+     * Actions:
+     * Pull task from neighbours;
      */
-    inline void
-    OnFinishTask(ResourceWPtr &resource) {
-        auto event = std::make_shared<FinishTaskEvent>(resource);
-        event_queue_.push(event);
-    }
+    void
+    OnFinishTask(const EventPtr &event);
 
     /*
      * Process copy completed events;
+     *
+     * Actions:
+     * Mark task source MOVED;
+     * Pull task from neighbours;
      */
-    inline void
-    OnCopyCompleted(ResourceWPtr &resource) {
-        auto event = std::make_shared<CopyCompletedEvent>(resource);
-        event_queue_.push(event);
-    }
+    void
+    OnCopyCompleted(const EventPtr &event);
 
     /*
-     * Process task table updated events;
+     * Process task table updated events, which happened on task_table->put;
+     *
+     * Actions:
+     * Push task to neighbours;
      */
-    inline void
-    OnTaskTableUpdated(ResourceWPtr &resource) {
-        auto event = std::make_shared<TaskTableUpdatedEvent>(resource);
-        event_queue_.push(event);
-    }
-
-
-public:
-    std::string
-    Dump();
-
+    void
+    OnTaskTableUpdated(const EventPtr &event);
 
 private:
+    /*
+     * Dispatch event to event handler;
+     */
+    void
+    Process(const EventPtr &event);
+
     /*
      * Called by worker_thread_;
      */
@@ -146,8 +112,12 @@ private:
     ResourceMgrWPtr res_mgr_;
     std::queue<EventPtr> event_queue_;
     std::thread worker_thread_;
+    std::mutex event_mutex_;
+    std::condition_variable event_cv_;
 };
 
+using SchedulerPtr = std::shared_ptr<Scheduler>;
+
 }
 }
 }
diff --git a/cpp/src/scheduler/TaskTable.cpp b/cpp/src/scheduler/TaskTable.cpp
index 1e77318e86..7ef033c500 100644
--- a/cpp/src/scheduler/TaskTable.cpp
+++ b/cpp/src/scheduler/TaskTable.cpp
@@ -5,29 +5,46 @@
  ******************************************************************************/
 
 #include "TaskTable.h"
+#include "event/TaskTableUpdatedEvent.h"
 #include <vector>
+#include <sstream>
 
 
 namespace zilliz {
 namespace milvus {
 namespace engine {
 
-TaskTable::TaskTable(std::vector<TaskPtr> &&tasks) {
-
-}
 
 void
 TaskTable::Put(TaskPtr task) {
-
+    std::lock_guard<std::mutex> lock(id_mutex_);
+    auto item = std::make_shared<TaskTableItem>();
+    item->id = id_++;
+    item->task = std::move(task);
+    item->state = TaskTableItemState::START;
+    table_.push_back(item);
+    if (subscriber_) {
+        subscriber_();
+    }
 }
 
 void
 TaskTable::Put(std::vector<TaskPtr> &tasks) {
-
+    std::lock_guard<std::mutex> lock(id_mutex_);
+    for (auto &task : tasks) {
+        auto item = std::make_shared<TaskTableItem>();
+        item->id = id_++;
+        item->task = std::move(task);
+        item->state = TaskTableItemState::START;
+        table_.push_back(item);
+    }
+    if (subscriber_) {
+        subscriber_();
+    }
 }
 
 
-TaskTableItem &
+TaskTableItemPtr
 TaskTable::Get(uint64_t index) {
     return table_[index];
 }
@@ -46,9 +63,9 @@ bool
 TaskTable::Move(uint64_t index) {
     auto &task = table_[index];
 
-    std::lock_guard<std::mutex> lock(task.mutex);
-    if (task.state == TaskTableItemState::START) {
-        task.state = TaskTableItemState::LOADING;
+    std::lock_guard<std::mutex> lock(task->mutex);
+    if (task->state == TaskTableItemState::LOADED) {
+        task->state = TaskTableItemState::MOVING;
         return true;
     }
     return false;
@@ -56,32 +73,88 @@ TaskTable::Move(uint64_t index) {
 
 bool
 TaskTable::Moved(uint64_t index) {
+    auto &task = table_[index];
+
+    std::lock_guard<std::mutex> lock(task->mutex);
+    if (task->state == TaskTableItemState::MOVING) {
+        task->state = TaskTableItemState::MOVED;
+        return true;
+    }
     return false;
 }
 
 bool
 TaskTable::Load(uint64_t index) {
+    auto &task = table_[index];
+
+    std::lock_guard<std::mutex> lock(task->mutex);
+    if (task->state == TaskTableItemState::START) {
+        task->state = TaskTableItemState::LOADING;
+        return true;
+    }
     return false;
 }
 
 bool
 TaskTable::Loaded(uint64_t index) {
+    auto &task = table_[index];
+
+    std::lock_guard<std::mutex> lock(task->mutex);
+    if (task->state == TaskTableItemState::LOADING) {
+        task->state = TaskTableItemState::LOADED;
+        return true;
+    }
     return false;
 }
 
 bool
 TaskTable::Execute(uint64_t index) {
+    auto &task = table_[index];
+
+    std::lock_guard<std::mutex> lock(task->mutex);
+    if (task->state == TaskTableItemState::LOADED) {
+        task->state = TaskTableItemState::EXECUTING;
+        return true;
+    }
     return false;
 }
 
 bool
 TaskTable::Executed(uint64_t index) {
+    auto &task = table_[index];
+
+    std::lock_guard<std::mutex> lock(task->mutex);
+    if (task->state == TaskTableItemState::EXECUTING) {
+        task->state = TaskTableItemState::EXECUTED;
+        return true;
+    }
     return false;
 }
 
+std::string
+ToString(TaskTableItemState state) {
+    switch (state) {
+        case TaskTableItemState::INVALID: return "INVALID";
+        case TaskTableItemState::START: return "START";
+        case TaskTableItemState::LOADING: return "LOADING";
+        case TaskTableItemState::LOADED: return "LOADED";
+        case TaskTableItemState::EXECUTING: return "EXECUTING";
+        case TaskTableItemState::EXECUTED: return "EXECUTED";
+        case TaskTableItemState::MOVING: return "MOVING";
+        case TaskTableItemState::MOVED: return "MOVED";
+        default: return "";
+    }
+}
+
 std::string
 TaskTable::Dump() {
-    return std::string();
+    std::stringstream ss;
+    for (auto &item : table_) {
+        ss << "<" << item->id;
+        ss << ", " << ToString(item->state);
+        ss << ">" << std::endl;
+    }
+    return ss.str();
 }
 
 }
diff --git a/cpp/src/scheduler/TaskTable.h b/cpp/src/scheduler/TaskTable.h
index dc286d8f74..8a482d0579 100644
--- a/cpp/src/scheduler/TaskTable.h
+++ b/cpp/src/scheduler/TaskTable.h
@@ -10,6 +10,7 @@
 #include <mutex>
 
 #include "task/SearchTask.h"
+#include "event/Event.h"
 
 
 namespace zilliz {
@@ -31,7 +32,7 @@ struct TaskTableItem {
     TaskTableItem() : id(0), state(TaskTableItemState::INVALID), mutex(), priority(0) {}
 
     TaskTableItem(const TaskTableItem &src)
-    : id(src.id), state(src.state), mutex(), priority(src.priority) {}
+        : id(src.id), state(src.state), mutex(), priority(src.priority) {}
 
     uint64_t id; // auto increment from 0;
     // TODO: add tag into task
@@ -42,12 +43,19 @@ struct TaskTableItem {
     uint8_t priority; // just a number, meaningless;
 };
 
+using TaskTableItemPtr = std::shared_ptr<TaskTableItem>;
+
 class TaskTable {
 public:
     TaskTable() = default;
 
-    explicit
-    TaskTable(std::vector<TaskPtr> &&tasks);
+    TaskTable(const TaskTable &) = delete;
+    TaskTable(TaskTable &&) = delete;
+
+    inline void
+    RegisterSubscriber(std::function<void(void)> subscriber) {
+        subscriber_ = std::move(subscriber);
+    }
 
     /*
      * Put one task;
@@ -65,7 +73,7 @@ public:
     /*
      * Return task table item reference;
      */
-    TaskTableItem &
+    TaskTableItemPtr
     Get(uint64_t index);
 
     /*
@@ -76,6 +84,29 @@ public:
     void
     Clear();
 
+    /*
+     * Return true if task table empty, otherwise false;
+     */
+    inline bool
+    Empty() {
+        return table_.empty();
+    }
+
+    /*
+     * Return size of task table;
+     */
+    inline size_t
+    Size() {
+        return table_.size();
+    }
+public:
+    TaskTableItemPtr &
+    operator[](uint64_t index) {
+        return table_[index];
+    }
+
+    std::deque<TaskTableItemPtr>::iterator begin() { return table_.begin(); }
+    std::deque<TaskTableItemPtr>::iterator end() { return table_.end(); }
 
 public:
 
@@ -139,7 +170,10 @@ public:
 
 private:
     // TODO: map better ?
-    std::deque<TaskTableItem> table_;
+    std::uint64_t id_ = 0;
+    mutable std::mutex id_mutex_;
+    std::deque<TaskTableItemPtr> table_;
+    std::function<void(void)> subscriber_ = nullptr;
 };
 
 
diff --git a/cpp/src/scheduler/action/Action.h b/cpp/src/scheduler/action/Action.h
new file mode 100644
index 0000000000..d72bbefc8d
--- /dev/null
+++ b/cpp/src/scheduler/action/Action.h
@@ -0,0 +1,34 @@
+/*******************************************************************************
+ * copyright 上海赜睿信息科技有限公司(zilliz) - all rights reserved
+ * unauthorized copying of this file, via any medium is strictly prohibited.
+ * proprietary and confidential.
+ ******************************************************************************/
+#pragma once
+
+#include "../resource/Resource.h"
+
+
+namespace zilliz {
+namespace milvus {
+namespace engine {
+
+class Action {
+public:
+    /*
+     * Push task to neighbour;
+     */
+    static void
+    PushTaskToNeighbour(const ResourceWPtr &self);
+
+
+    /*
+     * Pull task From neighbour;
+     */
+    static void
+    PullTaskFromNeighbour(const ResourceWPtr &self);
+};
+
+
+}
+}
+}
diff --git a/cpp/src/scheduler/action/PullTaskFromNeighbour.cpp b/cpp/src/scheduler/action/PullTaskFromNeighbour.cpp
new file mode 100644
index 0000000000..b1ac97b6e4
--- /dev/null
+++ b/cpp/src/scheduler/action/PullTaskFromNeighbour.cpp
@@ -0,0 +1,24 @@
+/*******************************************************************************
+ * Copyright 上海赜睿信息科技有限公司(Zilliz) - All Rights Reserved
+ * Unauthorized copying of this file, via any medium is strictly prohibited.
+ * Proprietary and confidential.
+ ******************************************************************************/
+
+#include "Action.h"
+
+
+namespace zilliz {
+namespace milvus {
+namespace engine {
+
+void
+Action::PullTaskFromNeighbour(const ResourceWPtr &self) {
+    // TODO: implement
+}
+
+
+}
+}
+}
+
+
diff --git a/cpp/src/scheduler/action/PushTaskToNeighbour.cpp b/cpp/src/scheduler/action/PushTaskToNeighbour.cpp
new file mode 100644
index 0000000000..a9b43b3f05
--- /dev/null
+++ b/cpp/src/scheduler/action/PushTaskToNeighbour.cpp
@@ -0,0 +1,44 @@
+/*******************************************************************************
+ * Copyright 上海赜睿信息科技有限公司(Zilliz) - All Rights Reserved
+ * Unauthorized copying of this file, via any medium is strictly prohibited.
+ * Proprietary and confidential.
+ ******************************************************************************/
+
+#include "Action.h"
+
+
+namespace zilliz {
+namespace milvus {
+namespace engine {
+
+void
+push_task(const ResourcePtr &self, const ResourcePtr &other) {
+    auto &self_task_table = self->task_table();
+    auto &other_task_table = other->task_table();
+    CacheMgr cache;
+    auto indexes = PickToMove(self_task_table, cache, 1);
+    for (auto index : indexes) {
+        if (self_task_table.Move(index)) {
+            auto task = self_task_table.Get(index)->task;
+            other_task_table.Put(task);
+            // TODO: mark moved future
+        }
+    }
+}
+
+void
+Action::PushTaskToNeighbour(const ResourceWPtr &res) {
+    if (auto self = res.lock()) {
+        for (auto &neighbour : self->GetNeighbours()) {
+            if (auto n = neighbour.neighbour_node.lock()) {
+                push_task(self, std::static_pointer_cast<Resource>(n));
+            }
+        }
+    }
+}
+
+
+}
+}
+}
+
diff --git a/cpp/src/scheduler/event/CopyCompletedEvent.h b/cpp/src/scheduler/event/CopyCompletedEvent.h
new file mode 100644
index 0000000000..d2f5ddb0ff
--- /dev/null
+++ b/cpp/src/scheduler/event/CopyCompletedEvent.h
@@ -0,0 +1,35 @@
+/*******************************************************************************
+ * copyright 上海赜睿信息科技有限公司(zilliz) - all rights reserved
+ * unauthorized copying of this file, via any medium is strictly prohibited.
+ * proprietary and confidential.
+ ******************************************************************************/
+#pragma once
+
+#include "Event.h"
+#include "../TaskTable.h"
+
+
+namespace zilliz {
+namespace milvus {
+namespace engine {
+
+class CopyCompletedEvent : public Event {
+public:
+    CopyCompletedEvent(std::weak_ptr<Resource> resource, TaskTableItemPtr task_table_item)
+        : Event(EventType::COPY_COMPLETED, std::move(resource)),
+          task_table_item_(std::move(task_table_item)) {}
+
+    inline std::string
+    Dump() const override {
+        return "<CopyCompletedEvent>";
+    }
+
+    friend std::ostream &operator<<(std::ostream &out, const CopyCompletedEvent &event);
+
+public:
+    TaskTableItemPtr task_table_item_;
+};
+
+}
+}
+}
diff --git a/cpp/src/scheduler/event/Event.h b/cpp/src/scheduler/event/Event.h
new file mode 100644
index 0000000000..788cfd6a73
--- /dev/null
+++ b/cpp/src/scheduler/event/Event.h
@@ -0,0 +1,51 @@
+/*******************************************************************************
+ * copyright 上海赜睿信息科技有限公司(zilliz) - all rights reserved
+ * unauthorized copying of this file, via any medium is strictly prohibited.
+ * proprietary and confidential.
+ ******************************************************************************/
+#pragma once
+
+#include <memory>
+
+namespace zilliz {
+namespace milvus {
+namespace engine {
+
+enum class EventType {
+    START_UP,
+    COPY_COMPLETED,
+    FINISH_TASK,
+    TASK_TABLE_UPDATED
+};
+
+class Resource;
+
+class Event {
+public:
+    explicit
+    Event(EventType type, std::weak_ptr<Resource> resource)
+        : type_(type),
+          resource_(std::move(resource)) {}
+
+    inline EventType
+    Type() const {
+        return type_;
+    }
+
+    inline virtual std::string
+    Dump() const {
+        return "<Event>";
+    }
+
+    friend std::ostream &operator<<(std::ostream &out, const Event &event);
+
+public:
+    EventType type_;
+    std::weak_ptr<Resource> resource_;
+};
+
+using EventPtr = std::shared_ptr<Event>;
+
+}
+}
+}
diff --git a/cpp/src/scheduler/event/EventDump.cpp b/cpp/src/scheduler/event/EventDump.cpp
new file mode 100644
index 0000000000..0d10f6f7b4
--- /dev/null
+++ b/cpp/src/scheduler/event/EventDump.cpp
@@ -0,0 +1,45 @@
+/*******************************************************************************
+ * Copyright 上海赜睿信息科技有限公司(Zilliz) - All Rights Reserved
+ * Unauthorized copying of this file, via any medium is strictly prohibited.
+ * Proprietary and confidential.
+ ******************************************************************************/
+
+#include "Event.h"
+#include "StartUpEvent.h"
+#include "CopyCompletedEvent.h"
+#include "FinishTaskEvent.h"
+#include "TaskTableUpdatedEvent.h"
+
+
+namespace zilliz {
+namespace milvus {
+namespace engine {
+
+std::ostream &operator<<(std::ostream &out, const Event &event) {
+    out << event.Dump();
+    return out;
+}
+
+std::ostream &operator<<(std::ostream &out, const StartUpEvent &event) {
+    out << event.Dump();
+    return out;
+}
+
+std::ostream &operator<<(std::ostream &out, const CopyCompletedEvent &event) {
+    out << event.Dump();
+    return out;
+}
+
+std::ostream &operator<<(std::ostream &out, const FinishTaskEvent &event) {
+    out << event.Dump();
+    return out;
+}
+
+std::ostream &operator<<(std::ostream &out, const TaskTableUpdatedEvent &event) {
+    out << event.Dump();
+    return out;
+}
+
+}
+}
+}
diff --git a/cpp/src/scheduler/event/FinishTaskEvent.h b/cpp/src/scheduler/event/FinishTaskEvent.h
new file mode 100644
index 0000000000..14daa9b532
--- /dev/null
+++ b/cpp/src/scheduler/event/FinishTaskEvent.h
@@ -0,0 +1,34 @@
+/*******************************************************************************
+ * copyright 上海赜睿信息科技有限公司(zilliz) - all rights reserved
+ * unauthorized copying of this file, via any medium is strictly prohibited.
+ * proprietary and confidential.
+ ******************************************************************************/
+#pragma once
+
+#include "Event.h"
+
+
+namespace zilliz {
+namespace milvus {
+namespace engine {
+
+class FinishTaskEvent : public Event {
+public:
+    FinishTaskEvent(std::weak_ptr<Resource> resource, TaskTableItemPtr task_table_item)
+        : Event(EventType::FINISH_TASK, std::move(resource)),
+          task_table_item_(std::move(task_table_item)) {}
+
+    inline std::string
+    Dump() const override {
+        return "<FinishTaskEvent>";
+    }
+
+    friend std::ostream &operator<<(std::ostream &out, const FinishTaskEvent &event);
+
+public:
+    TaskTableItemPtr task_table_item_;
+};
+
+}
+}
+}
diff --git a/cpp/src/scheduler/event/StartUpEvent.h b/cpp/src/scheduler/event/StartUpEvent.h
new file mode 100644
index 0000000000..4b5ec78cd6
--- /dev/null
+++ b/cpp/src/scheduler/event/StartUpEvent.h
@@ -0,0 +1,31 @@
+/*******************************************************************************
+ * copyright 上海赜睿信息科技有限公司(zilliz) - all rights reserved
+ * unauthorized copying of this file, via any medium is strictly prohibited.
+ * proprietary and confidential.
+ ******************************************************************************/
+#pragma once
+
+#include "Event.h"
+
+
+namespace zilliz {
+namespace milvus {
+namespace engine {
+
+class StartUpEvent : public Event {
+public:
+    explicit
+    StartUpEvent(std::weak_ptr<Resource> resource)
+        : Event(EventType::START_UP, std::move(resource)) {}
+
+    inline std::string
+    Dump() const override {
+        return "<StartUpEvent>";
+    }
+
+    friend std::ostream &operator<<(std::ostream &out, const StartUpEvent &event);
+};
+
+}
+}
+}
\ No newline at end of file
diff --git a/cpp/src/scheduler/event/TaskTableUpdatedEvent.h b/cpp/src/scheduler/event/TaskTableUpdatedEvent.h
new file mode 100644
index 0000000000..f96c30674c
--- /dev/null
+++ b/cpp/src/scheduler/event/TaskTableUpdatedEvent.h
@@ -0,0 +1,32 @@
+/*******************************************************************************
+ * copyright 上海赜睿信息科技有限公司(zilliz) - all rights reserved
+ * unauthorized copying of this file, via any medium is strictly prohibited.
+ * proprietary and confidential.
+ ******************************************************************************/
+#pragma once
+
+#include "Event.h"
+
+
+namespace zilliz {
+namespace milvus {
+namespace engine {
+
+class TaskTableUpdatedEvent : public Event {
+public:
+    explicit
+    TaskTableUpdatedEvent(std::weak_ptr<Resource> resource)
+        : Event(EventType::TASK_TABLE_UPDATED, std::move(resource)) {}
+
+    inline std::string
+    Dump() const override {
+        return "<TaskTableUpdatedEvent>";
+    }
+
+    friend std::ostream &operator<<(std::ostream &out, const TaskTableUpdatedEvent &event);
+};
+
+
+}
+}
+}
diff --git a/cpp/src/scheduler/resource/CpuResource.cpp b/cpp/src/scheduler/resource/CpuResource.cpp
index 32eb627046..01fca35ee4 100644
--- a/cpp/src/scheduler/resource/CpuResource.cpp
+++ b/cpp/src/scheduler/resource/CpuResource.cpp
@@ -11,26 +11,20 @@ namespace zilliz {
 namespace milvus {
 namespace engine {
 
+std::ostream &operator<<(std::ostream &out, const CpuResource &resource) {
+    out << resource.Dump();
+    return out;
+}
 
 CpuResource::CpuResource(std::string name)
     : Resource(std::move(name), ResourceType::CPU) {}
 
 void CpuResource::LoadFile(TaskPtr task) {
-    //if (src.type == DISK) {
-    //    fd = open(filename);
-    //    content = fd.read();
-    //    close(fd);
-    //} else if (src.type == CPU) {
-    //    memcpy(src, dest, len);
-    //} else if (src.type == GPU) {
-    //    cudaMemcpyD2H(src, dest);
-    //} else {
-    //    // unknown type, exception
-    //}
+    task->Load(LoadType::DISK2CPU, 0);
 }
 
 void CpuResource::Process(TaskPtr task) {
-
+    task->Execute();
 }
 
 }
diff --git a/cpp/src/scheduler/resource/CpuResource.h b/cpp/src/scheduler/resource/CpuResource.h
index be1340e954..c180ea07d7 100644
--- a/cpp/src/scheduler/resource/CpuResource.h
+++ b/cpp/src/scheduler/resource/CpuResource.h
@@ -19,6 +19,13 @@ public:
     explicit
     CpuResource(std::string name);
 
+    inline std::string
+    Dump() const override {
+        return "<CpuResource>";
+    }
+
+    friend std::ostream &operator<<(std::ostream &out, const CpuResource &resource);
+
 protected:
     void
     LoadFile(TaskPtr task) override;
diff --git a/cpp/src/scheduler/resource/DiskResource.cpp b/cpp/src/scheduler/resource/DiskResource.cpp
index dcc0687ac4..8612909e44 100644
--- a/cpp/src/scheduler/resource/DiskResource.cpp
+++ b/cpp/src/scheduler/resource/DiskResource.cpp
@@ -10,9 +10,14 @@ namespace zilliz {
 namespace milvus {
 namespace engine {
 
+std::ostream &operator<<(std::ostream &out, const DiskResource &resource) {
+    out << resource.Dump();
+    return out;
+}
 
 DiskResource::DiskResource(std::string name)
-    : Resource(std::move(name), ResourceType::DISK) {}
+    : Resource(std::move(name), ResourceType::DISK, true, false) {
+}
 
 void DiskResource::LoadFile(TaskPtr task) {
 
diff --git a/cpp/src/scheduler/resource/DiskResource.h b/cpp/src/scheduler/resource/DiskResource.h
index 39211dbb66..0fb9d625aa 100644
--- a/cpp/src/scheduler/resource/DiskResource.h
+++ b/cpp/src/scheduler/resource/DiskResource.h
@@ -18,6 +18,13 @@ public:
     explicit
     DiskResource(std::string name);
 
+    inline std::string
+    Dump() const override {
+        return "<DiskResource>";
+    }
+
+    friend std::ostream &operator<<(std::ostream &out, const DiskResource &resource);
+
 protected:
     void
     LoadFile(TaskPtr task) override;
diff --git a/cpp/src/scheduler/resource/GpuResource.cpp b/cpp/src/scheduler/resource/GpuResource.cpp
index 00d5df05b4..8606bb7856 100644
--- a/cpp/src/scheduler/resource/GpuResource.cpp
+++ b/cpp/src/scheduler/resource/GpuResource.cpp
@@ -11,16 +11,20 @@ namespace zilliz {
 namespace milvus {
 namespace engine {
 
+std::ostream &operator<<(std::ostream &out, const GpuResource &resource) {
+    out << resource.Dump();
+    return out;
+}
 
 GpuResource::GpuResource(std::string name)
     : Resource(std::move(name), ResourceType::GPU) {}
 
 void GpuResource::LoadFile(TaskPtr task) {
-
+    task->Load(LoadType::CPU2GPU, 0);
 }
 
 void GpuResource::Process(TaskPtr task) {
-
+    task->Execute();
 }
 
 }
diff --git a/cpp/src/scheduler/resource/GpuResource.h b/cpp/src/scheduler/resource/GpuResource.h
index 84bf163284..1cb38df34f 100644
--- a/cpp/src/scheduler/resource/GpuResource.h
+++ b/cpp/src/scheduler/resource/GpuResource.h
@@ -18,6 +18,13 @@ public:
     explicit
     GpuResource(std::string name);
 
+    inline std::string
+    Dump() const override {
+        return "<GpuResource>";
+    }
+
+    friend std::ostream &operator<<(std::ostream &out, const GpuResource &resource);
+
 protected:
     void
     LoadFile(TaskPtr task) override;
diff --git a/cpp/src/scheduler/resource/Node.cpp b/cpp/src/scheduler/resource/Node.cpp
index 76d61fe858..8e3db29ea2 100644
--- a/cpp/src/scheduler/resource/Node.cpp
+++ b/cpp/src/scheduler/resource/Node.cpp
@@ -55,8 +55,7 @@ std::string Node::Dump() {
 void Node::AddNeighbour(const NeighbourNodePtr &neighbour_node, Connection &connection) {
     std::lock_guard<std::mutex> lk(mutex_);
     if (auto s = neighbour_node.lock()) {
-        Neighbour neighbour(neighbour_node, connection);
-        neighbours_[s->id_] = neighbour;
+        neighbours_.emplace(std::make_pair(s->id_, Neighbour(neighbour_node, connection)));
     }
     // else do nothing, consider it..
 }
diff --git a/cpp/src/scheduler/resource/Resource.cpp b/cpp/src/scheduler/resource/Resource.cpp
index 7f59256474..2c46a703c6 100644
--- a/cpp/src/scheduler/resource/Resource.cpp
+++ b/cpp/src/scheduler/resource/Resource.cpp
@@ -10,54 +10,85 @@ namespace zilliz {
 namespace milvus {
 namespace engine {
 
-Resource::Resource(std::string name, ResourceType type)
+std::ostream &operator<<(std::ostream &out, const Resource &resource) {
+    out << resource.Dump();
+    return out;
+}
+
+Resource::Resource(std::string name,
+                   ResourceType type,
+                   bool enable_loader,
+                   bool enable_executor)
     : name_(std::move(name)),
       type_(type),
       running_(false),
+      enable_loader_(enable_loader),
+      enable_executor_(enable_executor),
       load_flag_(false),
       exec_flag_(false) {
+    task_table_.RegisterSubscriber([&] {
+        if (subscriber_) {
+            auto event = std::make_shared<TaskTableUpdatedEvent>(shared_from_this());
+            subscriber_(std::static_pointer_cast<Event>(event));
+        }
+    });
 }
 
 void Resource::Start() {
-    loader_thread_ = std::thread(&Resource::loader_function, this);
-    executor_thread_ = std::thread(&Resource::executor_function, this);
+    running_ = true;
+    if (enable_loader_) {
+        loader_thread_ = std::thread(&Resource::loader_function, this);
+    }
+    if (enable_executor_) {
+        executor_thread_ = std::thread(&Resource::executor_function, this);
+    }
 }
 
 void Resource::Stop() {
     running_ = false;
-    WakeupLoader();
-    WakeupExecutor();
+    if (enable_loader_) {
+        WakeupLoader();
+        loader_thread_.join();
+    }
+    if (enable_executor_) {
+        WakeupExecutor();
+        executor_thread_.join();
+    }
 }
 
 TaskTable &Resource::task_table() {
     return task_table_;
 }
 
-void Resource::WakeupExecutor() {
-    exec_cv_.notify_one();
-}
-
 void Resource::WakeupLoader() {
+    std::lock_guard<std::mutex> lock(load_mutex_);
+    load_flag_ = true;
     load_cv_.notify_one();
 }
 
-TaskPtr Resource::pick_task_load() {
+void Resource::WakeupExecutor() {
+    std::lock_guard<std::mutex> lock(exec_mutex_);
+    exec_flag_ = true;
+    exec_cv_.notify_one();
+}
+
+TaskTableItemPtr Resource::pick_task_load() {
     auto indexes = PickToLoad(task_table_, 3);
     for (auto index : indexes) {
         // try to set one task loading, then return
         if (task_table_.Load(index))
-            return task_table_.Get(index).task;
+            return task_table_.Get(index);
         // else try next
     }
     return nullptr;
 }
 
-TaskPtr Resource::pick_task_execute() {
+TaskTableItemPtr Resource::pick_task_execute() {
     auto indexes = PickToExecute(task_table_, 3);
     for (auto index : indexes) {
         // try to set one task executing, then return
         if (task_table_.Execute(index))
-            return task_table_.Get(index).task;
+            return task_table_.Get(index);
         // else try next
     }
     return nullptr;
@@ -67,24 +98,46 @@ void Resource::loader_function() {
     while (running_) {
         std::unique_lock<std::mutex> lock(load_mutex_);
         load_cv_.wait(lock, [&] { return load_flag_; });
-        auto task = pick_task_load();
-        if (task) {
-            LoadFile(task);
-            GetRegisterFunc(RegisterType::ON_COPY_COMPLETED)->Exec();
+        load_flag_ = false;
+        while (true) {
+            auto task_item = pick_task_load();
+            if (task_item == nullptr) {
+                break;
+            }
+            LoadFile(task_item->task);
+            // TODO: wrapper loaded
+            task_item->state = TaskTableItemState::LOADED;
+            if (subscriber_) {
+                auto event = std::make_shared<CopyCompletedEvent>(shared_from_this(), task_item);
+                subscriber_(std::static_pointer_cast<Event>(event));
+            }
         }
+
     }
 }
 
 void Resource::executor_function() {
-    GetRegisterFunc(RegisterType::START_UP)->Exec();
+    if (subscriber_) {
+        auto event = std::make_shared<StartUpEvent>(shared_from_this());
+        subscriber_(std::static_pointer_cast<Event>(event));
+    }
     while (running_) {
         std::unique_lock<std::mutex> lock(exec_mutex_);
         exec_cv_.wait(lock, [&] { return exec_flag_; });
-        auto task = pick_task_execute();
-        if (task) {
-            Process(task);
-            GetRegisterFunc(RegisterType::ON_FINISH_TASK)->Exec();
+        exec_flag_ = false;
+        while (true) {
+            auto task_item = pick_task_execute();
+            if (task_item == nullptr) {
+                break;
+            }
+            Process(task_item->task);
+            task_item->state = TaskTableItemState::EXECUTED;
+            if (subscriber_) {
+                auto event = std::make_shared<FinishTaskEvent>(shared_from_this(), task_item);
+                subscriber_(std::static_pointer_cast<Event>(event));
+            }
         }
+
     }
 }
 
diff --git a/cpp/src/scheduler/resource/Resource.h b/cpp/src/scheduler/resource/Resource.h
index 2961e281fa..c32149b46e 100644
--- a/cpp/src/scheduler/resource/Resource.h
+++ b/cpp/src/scheduler/resource/Resource.h
@@ -12,6 +12,11 @@
 #include <functional>
 #include <condition_variable>
 
+#include "../event/Event.h"
+#include "../event/StartUpEvent.h"
+#include "../event/CopyCompletedEvent.h"
+#include "../event/FinishTaskEvent.h"
+#include "../event/TaskTableUpdatedEvent.h"
 #include "../TaskTable.h"
 #include "../task/Task.h"
 #include "../Cost.h"
@@ -37,18 +42,28 @@ enum class RegisterType {
     ON_TASK_TABLE_UPDATED,
 };
 
-class Resource : public Node {
+class Resource : public Node, public std::enable_shared_from_this<Resource> {
 public:
     /*
      * Event function MUST be a short function, never blocking;
      */
-    template <typename T>
-    void Register_T(const RegisterType& type) {
+    template<typename T>
+    void Register_T(const RegisterType &type) {
         register_table_.emplace(type, [] { return std::make_shared<T>(); });
     }
 
     RegisterHandlerPtr
-    GetRegisterFunc(const RegisterType& type);
+    GetRegisterFunc(const RegisterType &type);
+
+    inline void
+    RegisterSubscriber(std::function<void(EventPtr)> subscriber) {
+        subscriber_ = std::move(subscriber);
+    }
+
+    inline ResourceType
+    Type() const {
+        return type_;
+    }
 
     void
     Start();
@@ -59,21 +74,31 @@ public:
     TaskTable &
     task_table();
 
+    inline virtual std::string
+    Dump() const {
+        return "<Resource>";
+    }
+
+    friend std::ostream &operator<<(std::ostream &out, const Resource &resource);
+
 public:
+    /*
+     * wake up loader;
+     */
+    void
+    WakeupLoader();
+
     /*
      * wake up executor;
      */
     void
     WakeupExecutor();
 
-    /* 
-     * wake up loader;
-     */
-    void
-    WakeupLoader();
-
 protected:
-    Resource(std::string name, ResourceType type);
+    Resource(std::string name,
+             ResourceType type,
+             bool enable_loader = true,
+             bool enable_executor = true);
 
     // TODO: SearchContextPtr to TaskPtr
     /*
@@ -100,14 +125,14 @@ private:
      * Pick one task to load;
      * Order by start time;
      */
-    TaskPtr
+    TaskTableItemPtr
     pick_task_load();
 
     /*
      * Pick one task to execute;
      * Pick by start time and priority;
      */
-    TaskPtr
+    TaskTableItemPtr
     pick_task_execute();
 
 private:
@@ -123,7 +148,6 @@ private:
     void
     executor_function();
 
-
 private:
     std::string name_;
     ResourceType type_;
@@ -131,8 +155,11 @@ private:
     TaskTable task_table_;
 
     std::map<RegisterType, std::function<RegisterHandlerPtr()>> register_table_;
+    std::function<void(EventPtr)> subscriber_ = nullptr;
 
     bool running_;
+    bool enable_loader_ = true;
+    bool enable_executor_ = true;
     std::thread loader_thread_;
     std::thread executor_thread_;
 
diff --git a/cpp/src/scheduler/task/TestTask.cpp b/cpp/src/scheduler/task/TestTask.cpp
new file mode 100644
index 0000000000..a974482e52
--- /dev/null
+++ b/cpp/src/scheduler/task/TestTask.cpp
@@ -0,0 +1,26 @@
+/*******************************************************************************
+ * Copyright 上海赜睿信息科技有限公司(Zilliz) - All Rights Reserved
+ * Unauthorized copying of this file, via any medium is strictly prohibited.
+ * Proprietary and confidential.
+ ******************************************************************************/
+
+#include "TestTask.h"
+
+namespace zilliz {
+namespace milvus {
+namespace engine {
+
+void
+TestTask::Load(LoadType type, uint8_t device_id) {
+    load_count_++;
+}
+
+void
+TestTask::Execute() {
+    exec_count_++;
+}
+
+}
+}
+}
+
diff --git a/cpp/src/scheduler/task/TestTask.h b/cpp/src/scheduler/task/TestTask.h
new file mode 100644
index 0000000000..5f49d2e31e
--- /dev/null
+++ b/cpp/src/scheduler/task/TestTask.h
@@ -0,0 +1,34 @@
+/*******************************************************************************
+ * Copyright 上海赜睿信息科技有限公司(Zilliz) - All Rights Reserved
+ * Unauthorized copying of this file, via any medium is strictly prohibited.
+ * Proprietary and confidential.
+ ******************************************************************************/
+#pragma once
+
+#include "Task.h"
+
+
+namespace zilliz {
+namespace milvus {
+namespace engine {
+
+class TestTask : public Task {
+public:
+    TestTask() = default;
+
+public:
+    void
+    Load(LoadType type, uint8_t device_id) override;
+
+    void
+    Execute() override;
+
+public:
+    uint64_t load_count_;
+    uint64_t exec_count_;
+};
+
+
+}
+}
+}
diff --git a/cpp/src/wrapper/knowhere/vec_impl.cpp b/cpp/src/wrapper/knowhere/vec_impl.cpp
index d1cc1ae4ff..f6bdd82618 100644
--- a/cpp/src/wrapper/knowhere/vec_impl.cpp
+++ b/cpp/src/wrapper/knowhere/vec_impl.cpp
@@ -8,6 +8,7 @@
 #include "knowhere/index/vector_index/idmap.h"
 #include "knowhere/index/vector_index/gpu_ivf.h"
 #include "knowhere/common/exception.h"
+#include "knowhere/index/vector_index/cloner.h"
 
 #include "vec_impl.h"
 #include "data_transfer.h"
@@ -152,6 +153,22 @@ VecIndexPtr VecIndexImpl::CopyToCpu(const Config &cfg) {
     return std::make_shared<VecIndexImpl>(cpu_index, type);
 }
 
+VecIndexPtr VecIndexImpl::Clone() {
+    auto clone_index = std::make_shared<VecIndexImpl>(index_->Clone(), type);
+    clone_index->dim = dim;
+    return clone_index;
+}
+
+int64_t VecIndexImpl::GetDeviceId() {
+    if (auto device_idx = std::dynamic_pointer_cast<GPUIndex>(index_)){
+        return device_idx->GetGpuDevice();
+    }
+    else {
+        return -1; // -1 == cpu
+    }
+    return 0;
+}
+
 float *BFIndex::GetRawVectors() {
     auto raw_index = std::dynamic_pointer_cast<IDMAP>(index_);
     if (raw_index) { return raw_index->GetRawVectors(); }
diff --git a/cpp/src/wrapper/knowhere/vec_impl.h b/cpp/src/wrapper/knowhere/vec_impl.h
index 5e46c16f70..f03f299f78 100644
--- a/cpp/src/wrapper/knowhere/vec_impl.h
+++ b/cpp/src/wrapper/knowhere/vec_impl.h
@@ -33,6 +33,8 @@ class VecIndexImpl : public VecIndex {
     server::KnowhereError Add(const long &nb, const float *xb, const long *ids, const Config &cfg) override;
     zilliz::knowhere::BinarySet Serialize() override;
     server::KnowhereError Load(const zilliz::knowhere::BinarySet &index_binary) override;
+    VecIndexPtr Clone() override;
+    int64_t GetDeviceId() override;
     server::KnowhereError Search(const long &nq, const float *xq, float *dist, long *ids, const Config &cfg) override;
 
  protected:
diff --git a/cpp/src/wrapper/knowhere/vec_index.h b/cpp/src/wrapper/knowhere/vec_index.h
index 088228386c..19f0c6d360 100644
--- a/cpp/src/wrapper/knowhere/vec_index.h
+++ b/cpp/src/wrapper/knowhere/vec_index.h
@@ -63,6 +63,10 @@ class VecIndex {
 
     virtual VecIndexPtr CopyToCpu(const Config &cfg = Config()) = 0;
 
+    virtual VecIndexPtr Clone() = 0;
+
+    virtual int64_t GetDeviceId() = 0;
+
     virtual IndexType GetType() = 0;
 
     virtual int64_t Dimension() = 0;
diff --git a/cpp/unittest/scheduler/CMakeLists.txt b/cpp/unittest/scheduler/CMakeLists.txt
index c38f4736f7..24210cb84d 100644
--- a/cpp/unittest/scheduler/CMakeLists.txt
+++ b/cpp/unittest/scheduler/CMakeLists.txt
@@ -14,6 +14,8 @@ aux_source_directory(${MILVUS_ENGINE_SRC}/db/scheduler scheduler_files)
 aux_source_directory(${MILVUS_ENGINE_SRC}/db/scheduler/context scheduler_context_files)
 aux_source_directory(${MILVUS_ENGINE_SRC}/db/scheduler/task scheduler_task_files)
 
+aux_source_directory(${MILVUS_ENGINE_SRC}/scheduler/action scheduler_action_srcs)
+aux_source_directory(${MILVUS_ENGINE_SRC}/scheduler/event scheduler_event_srcs)
 aux_source_directory(${MILVUS_ENGINE_SRC}/scheduler/resource scheduler_resource_srcs)
 aux_source_directory(${MILVUS_ENGINE_SRC}/scheduler/task scheduler_task_srcs)
 aux_source_directory(${MILVUS_ENGINE_SRC}/scheduler scheduler_srcs)
@@ -35,6 +37,9 @@ include_directories(/usr/include/mysql)
 
 set(scheduler_test_src
         ${unittest_srcs}
+        ${test_srcs}
+        ${scheduler_action_srcs}
+        ${scheduler_event_srcs}
         ${scheduler_resource_srcs}
         ${scheduler_task_srcs}
         ${scheduler_srcs}
diff --git a/cpp/unittest/scheduler/cost_test.cpp b/cpp/unittest/scheduler/cost_test.cpp
new file mode 100644
index 0000000000..d4c05257d1
--- /dev/null
+++ b/cpp/unittest/scheduler/cost_test.cpp
@@ -0,0 +1,47 @@
+#include "scheduler/TaskTable.h"
+#include "scheduler/Cost.h"
+#include <gtest/gtest.h>
+
+
+using namespace zilliz::milvus::engine;
+
+class CostTest : public ::testing::Test {
+protected:
+    void
+    SetUp() override {
+        for (uint64_t i = 0; i < 8; ++i) {
+            auto task = std::make_shared<XSearchTask>();
+            table_.Put(task);
+        }
+        table_.Get(0)->state = TaskTableItemState::INVALID;
+        table_.Get(1)->state = TaskTableItemState::START;
+        table_.Get(2)->state = TaskTableItemState::LOADING;
+        table_.Get(3)->state = TaskTableItemState::LOADED;
+        table_.Get(4)->state = TaskTableItemState::EXECUTING;
+        table_.Get(5)->state = TaskTableItemState::EXECUTED;
+        table_.Get(6)->state = TaskTableItemState::MOVING;
+        table_.Get(7)->state = TaskTableItemState::MOVED;
+    }
+
+
+    TaskTable table_;
+};
+
+TEST_F(CostTest, pick_to_move) {
+    CacheMgr cache;
+    auto indexes = PickToMove(table_, cache, 10);
+    ASSERT_EQ(indexes.size(), 1);
+    ASSERT_EQ(indexes[0], 3);
+}
+
+TEST_F(CostTest, pick_to_load) {
+    auto indexes = PickToLoad(table_, 10);
+    ASSERT_EQ(indexes.size(), 1);
+    ASSERT_EQ(indexes[0], 1);
+}
+
+TEST_F(CostTest, pick_to_executed) {
+    auto indexes = PickToExecute(table_, 10);
+    ASSERT_EQ(indexes.size(), 1);
+    ASSERT_EQ(indexes[0], 3);
+}
diff --git a/cpp/unittest/scheduler/node_test.cpp b/cpp/unittest/scheduler/node_test.cpp
index a2249e715b..f0621043db 100644
--- a/cpp/unittest/scheduler/node_test.cpp
+++ b/cpp/unittest/scheduler/node_test.cpp
@@ -10,6 +10,8 @@ protected:
     SetUp() override {
         node1_ = std::make_shared<Node>();
         node2_ = std::make_shared<Node>();
+        node3_ = std::make_shared<Node>();
+        node4_ = std::make_shared<Node>();
 
         auto pcie = Connection("PCIe", 11.0);
 
diff --git a/cpp/unittest/scheduler/normal_test.cpp b/cpp/unittest/scheduler/normal_test.cpp
index af5d1b91f8..4d1fa36de8 100644
--- a/cpp/unittest/scheduler/normal_test.cpp
+++ b/cpp/unittest/scheduler/normal_test.cpp
@@ -1,13 +1,14 @@
 #include "scheduler/ResourceFactory.h"
 #include "scheduler/ResourceMgr.h"
 #include "scheduler/Scheduler.h"
+#include "scheduler/task/TestTask.h"
+#include "utils/Log.h"
 #include <gtest/gtest.h>
 
 
 using namespace zilliz::milvus::engine;
 
-TEST(normal_test, DISABLED_test1) {
-
+TEST(normal_test, test1) {
     // ResourceMgr only compose resources, provide unified event
     auto res_mgr = std::make_shared<ResourceMgr>();
     auto disk = res_mgr->Add(ResourceFactory::Create("disk", "ssd"));
@@ -23,17 +24,62 @@ TEST(normal_test, DISABLED_test1) {
 
     res_mgr->Start();
 
-    auto task1 = std::make_shared<XSearchTask>();
-    auto task2 = std::make_shared<XSearchTask>();
-    if (auto observe = disk.lock()) {
-        observe->task_table().Put(task1);
-        observe->task_table().Put(task2);
-        observe->task_table().Put(task1);
-        observe->task_table().Put(task1);
-    }
-
     auto scheduler = new Scheduler(res_mgr);
     scheduler->Start();
 
-    while (true) sleep(1);
+    auto task1 = std::make_shared<TestTask>();
+    auto task2 = std::make_shared<TestTask>();
+    auto task3 = std::make_shared<TestTask>();
+    auto task4 = std::make_shared<TestTask>();
+    if (auto observe = disk.lock()) {
+        observe->task_table().Put(task1);
+        observe->task_table().Put(task2);
+        observe->task_table().Put(task3);
+        observe->task_table().Put(task4);
+    }
+
+//    if (auto disk_r = disk.lock()) {
+//        if (auto cpu_r = cpu.lock()) {
+//            if (auto gpu1_r = gpu1.lock()) {
+//                if (auto gpu2_r = gpu2.lock()) {
+//                    std::cout << "<<<<<<<<<<before<<<<<<<<<<" << std::endl;
+//                    std::cout << "disk:" << std::endl;
+//                    std::cout << disk_r->task_table().Dump() << std::endl;
+//                    std::cout << "cpu:" << std::endl;
+//                    std::cout << cpu_r->task_table().Dump() << std::endl;
+//                    std::cout << "gpu1:" << std::endl;
+//                    std::cout << gpu1_r->task_table().Dump() << std::endl;
+//                    std::cout << "gpu2:" << std::endl;
+//                    std::cout << gpu2_r->task_table().Dump() << std::endl;
+//                    std::cout << ">>>>>>>>>>before>>>>>>>>>>" << std::endl;
+//                }
+//            }
+//        }
+//    }
+
+    sleep(5);
+
+//    if (auto disk_r = disk.lock()) {
+//        if (auto cpu_r = cpu.lock()) {
+//            if (auto gpu1_r = gpu1.lock()) {
+//                if (auto gpu2_r = gpu2.lock()) {
+//                    std::cout << "<<<<<<<<<<after<<<<<<<<<<" << std::endl;
+//                    std::cout << "disk:" << std::endl;
+//                    std::cout << disk_r->task_table().Dump() << std::endl;
+//                    std::cout << "cpu:" << std::endl;
+//                    std::cout << cpu_r->task_table().Dump() << std::endl;
+//                    std::cout << "gpu1:" << std::endl;
+//                    std::cout << gpu1_r->task_table().Dump() << std::endl;
+//                    std::cout << "gpu2:" << std::endl;
+//                    std::cout << gpu2_r->task_table().Dump() << std::endl;
+//                    std::cout << ">>>>>>>>>>after>>>>>>>>>>" << std::endl;
+//                }
+//            }
+//        }
+//    }
+    scheduler->Stop();
+    res_mgr->Stop();
+
+    ASSERT_EQ(task1->load_count_, 1);
+    ASSERT_EQ(task1->exec_count_, 1);
 }
diff --git a/cpp/unittest/scheduler/resource_test.cpp b/cpp/unittest/scheduler/resource_test.cpp
new file mode 100644
index 0000000000..2f7d58eb57
--- /dev/null
+++ b/cpp/unittest/scheduler/resource_test.cpp
@@ -0,0 +1,144 @@
+/*******************************************************************************
+ * Copyright 上海赜睿信息科技有限公司(Zilliz) - All Rights Reserved
+ * Unauthorized copying of this file, via any medium is strictly prohibited.
+ * Proprietary and confidential.
+ ******************************************************************************/
+
+#include "scheduler/resource/Resource.h"
+#include "scheduler/resource/DiskResource.h"
+#include "scheduler/resource/CpuResource.h"
+#include "scheduler/resource/GpuResource.h"
+#include "scheduler/task/Task.h"
+#include "scheduler/task/TestTask.h"
+#include "scheduler/ResourceFactory.h"
+#include <gtest/gtest.h>
+
+
+namespace zilliz {
+namespace milvus {
+namespace engine {
+
+class ResourceTest : public testing::Test {
+protected:
+    void
+    SetUp() override {
+        disk_resource_ = ResourceFactory::Create("disk");
+        cpu_resource_ = ResourceFactory::Create("cpu");
+        gpu_resource_ = ResourceFactory::Create("gpu");
+        resources_.push_back(disk_resource_);
+        resources_.push_back(cpu_resource_);
+        resources_.push_back(gpu_resource_);
+
+        auto subscriber = [&](EventPtr event) {
+            if (event->Type() == EventType::COPY_COMPLETED) {
+                std::lock_guard<std::mutex> lock(load_mutex_);
+                ++load_count_;
+                cv_.notify_one();
+            }
+
+            if (event->Type() == EventType::FINISH_TASK) {
+                std::lock_guard<std::mutex> lock(load_mutex_);
+                ++exec_count_;
+                cv_.notify_one();
+            }
+        };
+
+        disk_resource_->RegisterSubscriber(subscriber);
+        cpu_resource_->RegisterSubscriber(subscriber);
+        gpu_resource_->RegisterSubscriber(subscriber);
+
+        disk_resource_->Start();
+        cpu_resource_->Start();
+        gpu_resource_->Start();
+    }
+
+    void
+    TearDown() override {
+        disk_resource_->Stop();
+        cpu_resource_->Stop();
+        gpu_resource_->Stop();
+    }
+
+    void
+    WaitLoader(uint64_t count) {
+        std::unique_lock<std::mutex> lock(load_mutex_);
+        cv_.wait(lock, [&] { return load_count_ == count; });
+    }
+
+    void
+    WaitExecutor(uint64_t count) {
+        std::unique_lock<std::mutex> lock(exec_mutex_);
+        cv_.wait(lock, [&] { return exec_count_ == count; });
+    }
+
+    ResourcePtr disk_resource_;
+    ResourcePtr cpu_resource_;
+    ResourcePtr gpu_resource_;
+    std::vector<ResourcePtr> resources_;
+    uint64_t load_count_ = 0;
+    uint64_t exec_count_ = 0;
+    std::mutex load_mutex_;
+    std::mutex exec_mutex_;
+    std::condition_variable cv_;
+};
+
+TEST_F(ResourceTest, cpu_resource_test) {
+    const uint64_t NUM = 100;
+    std::vector<std::shared_ptr<TestTask>> tasks;
+    for (uint64_t i = 0; i < NUM; ++i) {
+        auto task = std::make_shared<TestTask>();
+        tasks.push_back(task);
+        cpu_resource_->task_table().Put(task);
+    }
+
+    cpu_resource_->WakeupLoader();
+    WaitLoader(NUM);
+//    std::cout << "after WakeupLoader" << std::endl;
+//    std::cout << cpu_resource_->task_table().Dump();
+
+    for (uint64_t i = 0; i < NUM; ++i) {
+        ASSERT_EQ(tasks[i]->load_count_, 1);
+    }
+
+    cpu_resource_->WakeupExecutor();
+    WaitExecutor(NUM);
+//    std::cout << "after WakeupExecutor" << std::endl;
+//    std::cout << cpu_resource_->task_table().Dump();
+
+    for (uint64_t i = 0; i < NUM; ++i) {
+        ASSERT_EQ(tasks[i]->exec_count_, 1);
+    }
+}
+
+TEST_F(ResourceTest, gpu_resource_test) {
+    const uint64_t NUM = 100;
+    std::vector<std::shared_ptr<TestTask>> tasks;
+    for (uint64_t i = 0; i < NUM; ++i) {
+        auto task = std::make_shared<TestTask>();
+        tasks.push_back(task);
+        gpu_resource_->task_table().Put(task);
+    }
+
+    gpu_resource_->WakeupLoader();
+    WaitLoader(NUM);
+//    std::cout << "after WakeupLoader" << std::endl;
+//    std::cout << cpu_resource_->task_table().Dump();
+
+    for (uint64_t i = 0; i < NUM; ++i) {
+        ASSERT_EQ(tasks[i]->load_count_, 1);
+    }
+
+    gpu_resource_->WakeupExecutor();
+    WaitExecutor(NUM);
+//    std::cout << "after WakeupExecutor" << std::endl;
+//    std::cout << cpu_resource_->task_table().Dump();
+
+    for (uint64_t i = 0; i < NUM; ++i) {
+        ASSERT_EQ(tasks[i]->exec_count_, 1);
+    }
+}
+
+
+}
+}
+}
diff --git a/cpp/unittest/scheduler/scheduler_test.cpp b/cpp/unittest/scheduler/scheduler_test.cpp
new file mode 100644
index 0000000000..787ae59329
--- /dev/null
+++ b/cpp/unittest/scheduler/scheduler_test.cpp
@@ -0,0 +1,17 @@
+/*******************************************************************************
+ * Copyright 上海赜睿信息科技有限公司(Zilliz) - All Rights Reserved
+ * Unauthorized copying of this file, via any medium is strictly prohibited.
+ * Proprietary and confidential.
+ ******************************************************************************/
+
+#include <gtest/gtest.h>
+
+
+namespace zilliz {
+namespace milvus {
+namespace engine {
+
+
+}
+}
+}
diff --git a/cpp/unittest/scheduler/tasktable_test.cpp b/cpp/unittest/scheduler/tasktable_test.cpp
index 68255b8e93..f48db3af2d 100644
--- a/cpp/unittest/scheduler/tasktable_test.cpp
+++ b/cpp/unittest/scheduler/tasktable_test.cpp
@@ -45,8 +45,6 @@ protected:
         invalid_task_ = nullptr;
         task1_ = std::make_shared<XSearchTask>();
         task2_ = std::make_shared<XSearchTask>();
-
-        empty_table_ = TaskTable();
     }
 
     TaskPtr invalid_task_;
@@ -58,19 +56,19 @@ protected:
 
 TEST_F(TaskTableBaseTest, put_task) {
     empty_table_.Put(task1_);
-    ASSERT_EQ(empty_table_.Get(0).task, task1_);
+    ASSERT_EQ(empty_table_.Get(0)->task, task1_);
 }
 
 TEST_F(TaskTableBaseTest, put_invalid_test) {
     empty_table_.Put(invalid_task_);
-    ASSERT_EQ(empty_table_.Get(0).task, invalid_task_);
+    ASSERT_EQ(empty_table_.Get(0)->task, invalid_task_);
 }
 
 TEST_F(TaskTableBaseTest, put_batch) {
     std::vector<TaskPtr> tasks{task1_, task2_};
     empty_table_.Put(tasks);
-    ASSERT_EQ(empty_table_.Get(0).task, task1_);
-    ASSERT_EQ(empty_table_.Get(1).task, task2_);
+    ASSERT_EQ(empty_table_.Get(0)->task, task1_);
+    ASSERT_EQ(empty_table_.Get(1)->task, task2_);
 }
 
 TEST_F(TaskTableBaseTest, put_empty_batch) {
@@ -89,14 +87,14 @@ protected:
             table1_.Put(task);
         }
 
-        table1_.Get(0).state = TaskTableItemState::INVALID;
-        table1_.Get(1).state = TaskTableItemState::START;
-        table1_.Get(2).state = TaskTableItemState::LOADING;
-        table1_.Get(3).state = TaskTableItemState::LOADED;
-        table1_.Get(4).state = TaskTableItemState::EXECUTING;
-        table1_.Get(5).state = TaskTableItemState::EXECUTED;
-        table1_.Get(6).state = TaskTableItemState::MOVING;
-        table1_.Get(7).state = TaskTableItemState::MOVED;
+        table1_.Get(0)->state = TaskTableItemState::INVALID;
+        table1_.Get(1)->state = TaskTableItemState::START;
+        table1_.Get(2)->state = TaskTableItemState::LOADING;
+        table1_.Get(3)->state = TaskTableItemState::LOADED;
+        table1_.Get(4)->state = TaskTableItemState::EXECUTING;
+        table1_.Get(5)->state = TaskTableItemState::EXECUTED;
+        table1_.Get(6)->state = TaskTableItemState::MOVING;
+        table1_.Get(7)->state = TaskTableItemState::MOVED;
     }
 
     TaskTable table1_;
@@ -106,22 +104,22 @@ TEST_F(TaskTableAdvanceTest, load) {
     table1_.Load(1);
     table1_.Loaded(2);
 
-    ASSERT_EQ(table1_.Get(1).state, TaskTableItemState::LOADING);
-    ASSERT_EQ(table1_.Get(2).state, TaskTableItemState::LOADED);
+    ASSERT_EQ(table1_.Get(1)->state, TaskTableItemState::LOADING);
+    ASSERT_EQ(table1_.Get(2)->state, TaskTableItemState::LOADED);
 }
 
 TEST_F(TaskTableAdvanceTest, execute) {
     table1_.Execute(3);
     table1_.Executed(4);
 
-    ASSERT_EQ(table1_.Get(3).state, TaskTableItemState::EXECUTING);
-    ASSERT_EQ(table1_.Get(4).state, TaskTableItemState::EXECUTED);
+    ASSERT_EQ(table1_.Get(3)->state, TaskTableItemState::EXECUTING);
+    ASSERT_EQ(table1_.Get(4)->state, TaskTableItemState::EXECUTED);
 }
 
 TEST_F(TaskTableAdvanceTest, move) {
     table1_.Move(3);
     table1_.Moved(6);
 
-    ASSERT_EQ(table1_.Get(3).state, TaskTableItemState::MOVING);
-    ASSERT_EQ(table1_.Get(6).state, TaskTableItemState::MOVED);
+    ASSERT_EQ(table1_.Get(3)->state, TaskTableItemState::MOVING);
+    ASSERT_EQ(table1_.Get(6)->state, TaskTableItemState::MOVED);
 }
diff --git a/cpp/unittest/server/cache_test.cpp b/cpp/unittest/server/cache_test.cpp
index df2a869e5c..4f1d1db4ef 100644
--- a/cpp/unittest/server/cache_test.cpp
+++ b/cpp/unittest/server/cache_test.cpp
@@ -39,6 +39,14 @@ public:
 
     }
 
+    engine::VecIndexPtr Clone() override {
+        return zilliz::milvus::engine::VecIndexPtr();
+    }
+
+    int64_t GetDeviceId() override {
+        return 0;
+    }
+
     engine::IndexType GetType() override {
         return engine::IndexType::INVALID;
     }