diff --git a/scheduler/service/service_v2.go b/scheduler/service/service_v2.go
index ce6a4a111..9548788b9 100644
--- a/scheduler/service/service_v2.go
+++ b/scheduler/service/service_v2.go
@@ -109,7 +109,10 @@ func (v *V2) AnnouncePeer(stream schedulerv2.Scheduler_AnnouncePeerServer) error
 			}
 		case *schedulerv2.AnnouncePeerRequest_RegisterSeedPeerRequest:
 			logger.Infof("receive AnnouncePeerRequest_RegisterSeedPeerRequest: %#v", announcePeerRequest.RegisterSeedPeerRequest.Download)
-			v.handleRegisterSeedPeerRequest(ctx, req.HostId, req.TaskId, req.PeerId, announcePeerRequest.RegisterSeedPeerRequest)
+			if err := v.handleRegisterSeedPeerRequest(ctx, stream, req.HostId, req.TaskId, req.PeerId, announcePeerRequest.RegisterSeedPeerRequest); err != nil {
+				logger.Error(err)
+				return err
+			}
 		case *schedulerv2.AnnouncePeerRequest_DownloadPeerStartedRequest:
 			logger.Infof("receive AnnouncePeerRequest_DownloadPeerStartedRequest: %#v", announcePeerRequest.DownloadPeerStartedRequest)
 			v.handleDownloadPeerStartedRequest(ctx, announcePeerRequest.DownloadPeerStartedRequest)
@@ -151,11 +154,6 @@ func (v *V2) AnnouncePeer(stream schedulerv2.Scheduler_AnnouncePeerServer) error
 	}
 }
 
-// TODO Implement function.
-// handleRegisterSeedPeerRequest handles RegisterSeedPeerRequest of AnnouncePeerRequest.
-func (v *V2) handleRegisterSeedPeerRequest(ctx context.Context, hostID, taskID, peerID string, req *schedulerv2.RegisterSeedPeerRequest) {
-}
-
 // TODO Implement function.
 // handleDownloadPeerStartedRequest handles DownloadPeerStartedRequest of AnnouncePeerRequest.
 func (v *V2) handleDownloadPeerStartedRequest(ctx context.Context, req *schedulerv2.DownloadPeerStartedRequest) {
@@ -669,9 +667,9 @@ func (v *V2) LeaveHost(ctx context.Context, req *schedulerv2.LeaveHostRequest) e
 // handleRegisterPeerRequest handles RegisterPeerRequest of AnnouncePeerRequest.
 func (v *V2) handleRegisterPeerRequest(ctx context.Context, stream schedulerv2.Scheduler_AnnouncePeerServer, hostID, taskID, peerID string, req *schedulerv2.RegisterPeerRequest) error {
 	// Handle resource included host, task, and peer.
-	_, task, peer, err := v.handleResource(ctx, stream, hostID, taskID, peerID, req)
+	_, task, peer, err := v.handleResource(ctx, stream, hostID, taskID, peerID, req.Download)
 	if err != nil {
-		return status.Error(codes.FailedPrecondition, err.Error())
+		return err
 	}
 
 	// When there are no available peers for a task, the scheduler needs to trigger
@@ -684,8 +682,145 @@ func (v *V2) handleRegisterPeerRequest(ctx context.Context, stream schedulerv2.S
 		}
 	}
 
-	// Provide different scheduling strategies for different task type.
-	sizeScope := task.SizeScope()
+	// Scheduling parent for the peer..
+	return v.schedule(ctx, peer)
+}
+
+// handleRegisterSeedPeerRequest handles RegisterSeedPeerRequest of AnnouncePeerRequest.
+func (v *V2) handleRegisterSeedPeerRequest(ctx context.Context, stream schedulerv2.Scheduler_AnnouncePeerServer, hostID, taskID, peerID string, req *schedulerv2.RegisterSeedPeerRequest) error {
+	// Handle resource included host, task, and peer.
+	_, task, peer, err := v.handleResource(ctx, stream, hostID, taskID, peerID, req.Download)
+	if err != nil {
+		return err
+	}
+
+	// When there are no available peers for a task, the scheduler needs to trigger
+	// the first task download in the p2p cluster.
+	blocklist := set.NewSafeSet[string]()
+	blocklist.Add(peer.ID)
+	if !task.HasAvailablePeer(blocklist) {
+		// When the task has no available peer,
+		// the seed peer will download back-to-source directly.
+		peer.NeedBackToSource.Store(true)
+	}
+
+	// Scheduling parent for the peer..
+	return v.schedule(ctx, peer)
+}
+
+// handleResource handles resource included host, task, and peer.
+func (v *V2) handleResource(ctx context.Context, stream schedulerv2.Scheduler_AnnouncePeerServer, hostID, taskID, peerID string, download *commonv2.Download) (*resource.Host, *resource.Task, *resource.Peer, error) {
+	// If the host does not exist and the host address cannot be found,
+	// it may cause an exception.
+	host, loaded := v.resource.HostManager().Load(hostID)
+	if !loaded {
+		return nil, nil, nil, status.Errorf(codes.NotFound, "host %s not found", hostID)
+	}
+
+	// Store new task or update task.
+	task, loaded := v.resource.TaskManager().Load(taskID)
+	if !loaded {
+		options := []resource.TaskOption{resource.WithPieceLength(download.PieceLength)}
+		if download.Digest != "" {
+			d, err := digest.Parse(download.Digest)
+			if err != nil {
+				return nil, nil, nil, status.Error(codes.InvalidArgument, err.Error())
+			}
+
+			// If request has invalid digest, then new task with the nil digest.
+			options = append(options, resource.WithDigest(d))
+		}
+
+		task = resource.NewTask(taskID, download.Url, download.Tag, download.Application, download.Type,
+			download.Filters, download.Header, int32(v.config.Scheduler.BackToSourceCount), options...)
+		v.resource.TaskManager().Store(task)
+	} else {
+		task.URL = download.Url
+		task.Filters = download.Filters
+		task.Header = download.Header
+	}
+
+	// Store new peer or load peer.
+	peer, loaded := v.resource.PeerManager().Load(peerID)
+	if !loaded {
+		options := []resource.PeerOption{resource.WithPriority(download.Priority), resource.WithAnnouncePeerStream(stream)}
+		if download.Range != nil {
+			options = append(options, resource.WithRange(http.Range{Start: download.Range.Start, Length: download.Range.Length}))
+		}
+
+		peer = resource.NewPeer(peerID, task, host, options...)
+		v.resource.PeerManager().Store(peer)
+	}
+
+	return host, task, peer, nil
+}
+
+// downloadTaskBySeedPeer downloads task by seed peer.
+func (v *V2) downloadTaskBySeedPeer(ctx context.Context, peer *resource.Peer) error {
+	// Trigger the first download task based on different priority levels,
+	// refer to https://github.com/dragonflyoss/api/blob/main/pkg/apis/common/v2/common.proto#L74.
+	priority := peer.CalculatePriority(v.dynconfig)
+	peer.Log.Infof("peer priority is %s", priority.String())
+	switch priority {
+	case commonv2.Priority_LEVEL6, commonv2.Priority_LEVEL0:
+		// Super peer is first triggered to download back-to-source.
+		if v.config.SeedPeer.Enable && !peer.Task.IsSeedPeerFailed() {
+			go func(ctx context.Context, peer *resource.Peer, hostType types.HostType) {
+				if err := v.resource.SeedPeer().DownloadTask(context.Background(), peer.Task, hostType); err != nil {
+					peer.Log.Errorf("%s seed peer downloads task failed %s", hostType.Name(), err.Error())
+					return
+				}
+			}(ctx, peer, types.HostTypeSuperSeed)
+			break
+		}
+
+		fallthrough
+	case commonv2.Priority_LEVEL5:
+		// Strong peer is first triggered to download back-to-source.
+		if v.config.SeedPeer.Enable && !peer.Task.IsSeedPeerFailed() {
+			go func(ctx context.Context, peer *resource.Peer, hostType types.HostType) {
+				if err := v.resource.SeedPeer().DownloadTask(context.Background(), peer.Task, hostType); err != nil {
+					peer.Log.Errorf("%s seed peer downloads task failed %s", hostType.Name(), err.Error())
+					return
+				}
+			}(ctx, peer, types.HostTypeStrongSeed)
+			break
+		}
+
+		fallthrough
+	case commonv2.Priority_LEVEL4:
+		// Weak peer is first triggered to download back-to-source.
+		if v.config.SeedPeer.Enable && !peer.Task.IsSeedPeerFailed() {
+			go func(ctx context.Context, peer *resource.Peer, hostType types.HostType) {
+				if err := v.resource.SeedPeer().DownloadTask(context.Background(), peer.Task, hostType); err != nil {
+					peer.Log.Errorf("%s seed peer downloads task failed %s", hostType.Name(), err.Error())
+					return
+				}
+			}(ctx, peer, types.HostTypeWeakSeed)
+			break
+		}
+
+		fallthrough
+	case commonv2.Priority_LEVEL3:
+		// When the task has no available peer,
+		// the peer is first to download back-to-source.
+		peer.NeedBackToSource.Store(true)
+	case commonv2.Priority_LEVEL2:
+		// Peer is first to download back-to-source.
+		return status.Errorf(codes.NotFound, "%s peer not found candidate peers", commonv2.Priority_LEVEL2.String())
+	case commonv2.Priority_LEVEL1:
+		// Download task is forbidden.
+		return status.Errorf(codes.FailedPrecondition, "%s peer is forbidden", commonv2.Priority_LEVEL1.String())
+	default:
+		return status.Errorf(codes.InvalidArgument, "invalid priority %#v", priority)
+	}
+
+	return nil
+}
+
+// schedule provides different scheduling strategies for different task type.
+func (v *V2) schedule(ctx context.Context, peer *resource.Peer) error {
+	sizeScope := peer.Task.SizeScope()
 	switch sizeScope {
 	case commonv2.SizeScope_EMPTY:
 		// Return an EmptyTaskResponse directly.
@@ -716,7 +851,7 @@ func (v *V2) handleRegisterPeerRequest(ctx context.Context, stream schedulerv2.S
 		// it will be scheduled as a Normal Task.
 		peer.Log.Info("scheduling as SizeScope_TINY")
 		if !peer.Task.CanReuseDirectPiece() {
-			peer.Log.Warnf("can not reuse direct piece %d %d", len(task.DirectPiece), task.ContentLength.Load())
+			peer.Log.Warnf("can not reuse direct piece %d %d", len(peer.Task.DirectPiece), peer.Task.ContentLength.Load())
 			break
 		}
 
@@ -796,113 +931,3 @@ func (v *V2) handleRegisterPeerRequest(ctx context.Context, stream schedulerv2.S
 
 	return nil
 }
-
-// handleResource handles resource included host, task, and peer.
-func (v *V2) handleResource(ctx context.Context, stream schedulerv2.Scheduler_AnnouncePeerServer, hostID, taskID, peerID string, req *schedulerv2.RegisterPeerRequest) (*resource.Host, *resource.Task, *resource.Peer, error) {
-	// If the host does not exist and the host address cannot be found,
-	// it may cause an exception.
-	host, loaded := v.resource.HostManager().Load(hostID)
-	if !loaded {
-		return nil, nil, nil, fmt.Errorf("host %s not found", hostID)
-	}
-
-	// Store new task or update task.
-	task, loaded := v.resource.TaskManager().Load(taskID)
-	if !loaded {
-		options := []resource.TaskOption{resource.WithPieceLength(req.Download.PieceLength)}
-		if req.Download.Digest != "" {
-			d, err := digest.Parse(req.Download.Digest)
-			if err != nil {
-				return nil, nil, nil, fmt.Errorf("invalid digest %s", req.Download.Digest)
-			}
-
-			// If request has invalid digest, then new task with the nil digest.
-			options = append(options, resource.WithDigest(d))
-		}
-
-		task = resource.NewTask(taskID, req.Download.Url, req.Download.Tag, req.Download.Application, req.Download.Type,
-			req.Download.Filters, req.Download.Header, int32(v.config.Scheduler.BackToSourceCount), options...)
-		v.resource.TaskManager().Store(task)
-	} else {
-		task.URL = req.Download.Url
-		task.Filters = req.Download.Filters
-		task.Header = req.Download.Header
-	}
-
-	// Store new peer or load peer.
-	peer, loaded := v.resource.PeerManager().Load(peerID)
-	if !loaded {
-		options := []resource.PeerOption{resource.WithPriority(req.Download.Priority), resource.WithAnnouncePeerStream(stream)}
-		if req.Download.Range != nil {
-			options = append(options, resource.WithRange(http.Range{Start: req.Download.Range.Start, Length: req.Download.Range.Length}))
-		}
-
-		peer = resource.NewPeer(peerID, task, host, options...)
-		v.resource.PeerManager().Store(peer)
-	}
-
-	return host, task, peer, nil
-}
-
-// downloadTaskBySeedPeer downloads task by seed peer.
-func (v *V2) downloadTaskBySeedPeer(ctx context.Context, peer *resource.Peer) error {
-	// Trigger the first download task based on different priority levels,
-	// refer to https://github.com/dragonflyoss/api/blob/main/pkg/apis/common/v2/common.proto#L74.
-	priority := peer.CalculatePriority(v.dynconfig)
-	peer.Log.Infof("peer priority is %s", priority.String())
-	switch priority {
-	case commonv2.Priority_LEVEL6, commonv2.Priority_LEVEL0:
-		// Super peer is first triggered to back-to-source.
-		if v.config.SeedPeer.Enable && !peer.Task.IsSeedPeerFailed() {
-			go func(ctx context.Context, peer *resource.Peer, hostType types.HostType) {
-				if err := v.resource.SeedPeer().DownloadTask(context.Background(), peer.Task, hostType); err != nil {
-					peer.Log.Errorf("%s seed peer downloads task failed %s", hostType.Name(), err.Error())
-					return
-				}
-			}(ctx, peer, types.HostTypeSuperSeed)
-			break
-		}
-
-		fallthrough
-	case commonv2.Priority_LEVEL5:
-		// Strong peer is first triggered to back-to-source.
-		if v.config.SeedPeer.Enable && !peer.Task.IsSeedPeerFailed() {
-			go func(ctx context.Context, peer *resource.Peer, hostType types.HostType) {
-				if err := v.resource.SeedPeer().DownloadTask(context.Background(), peer.Task, hostType); err != nil {
-					peer.Log.Errorf("%s seed peer downloads task failed %s", hostType.Name(), err.Error())
-					return
-				}
-			}(ctx, peer, types.HostTypeStrongSeed)
-			break
-		}
-
-		fallthrough
-	case commonv2.Priority_LEVEL4:
-		// Weak peer is first triggered to back-to-source.
-		if v.config.SeedPeer.Enable && !peer.Task.IsSeedPeerFailed() {
-			go func(ctx context.Context, peer *resource.Peer, hostType types.HostType) {
-				if err := v.resource.SeedPeer().DownloadTask(context.Background(), peer.Task, hostType); err != nil {
-					peer.Log.Errorf("%s seed peer downloads task failed %s", hostType.Name(), err.Error())
-					return
-				}
-			}(ctx, peer, types.HostTypeWeakSeed)
-			break
-		}
-
-		fallthrough
-	case commonv2.Priority_LEVEL3:
-		// When the task is downloaded for the first time,
-		// the normal peer is first to download back-to-source.
-		peer.NeedBackToSource.Store(true)
-	case commonv2.Priority_LEVEL2:
-		// Peer is first to download back-to-source.
-		return status.Errorf(codes.NotFound, "%s peer not found candidate peers", commonv2.Priority_LEVEL2.String())
-	case commonv2.Priority_LEVEL1:
-		// Download task is forbidden.
-		return status.Errorf(codes.FailedPrecondition, "%s peer is forbidden", commonv2.Priority_LEVEL1.String())
-	default:
-		return status.Errorf(codes.InvalidArgument, "invalid priority %#v", priority)
-	}
-
-	return nil
-}
diff --git a/scheduler/service/service_v2_test.go b/scheduler/service/service_v2_test.go
index fe665f340..a6425acc2 100644
--- a/scheduler/service/service_v2_test.go
+++ b/scheduler/service/service_v2_test.go
@@ -19,7 +19,6 @@ package service
 import (
 	"context"
 	"errors"
-	"fmt"
 	"reflect"
 	"sync"
 	"testing"
@@ -932,7 +931,7 @@ func TestServiceV2_handleRegisterPeerRequest(t *testing.T) {
 
 				assert := assert.New(t)
 				assert.ErrorIs(svc.handleRegisterPeerRequest(context.Background(), stream, peer.Host.ID, peer.Task.ID, peer.ID, req),
-					status.Errorf(codes.FailedPrecondition, "host %s not found", peer.Host.ID))
+					status.Errorf(codes.NotFound, "host %s not found", peer.Host.ID))
 			},
 		},
 		{
@@ -1388,18 +1387,496 @@ func TestServiceV2_handleRegisterPeerRequest(t *testing.T) {
 	}
 }
 
-func TestServiceV2_handleResource(t *testing.T) {
+func TestServiceV2_handleRegisterSeedPeerRequest(t *testing.T) {
 	tests := []struct {
 		name string
-		req  *schedulerv2.RegisterPeerRequest
-		run  func(t *testing.T, svc *V2, req *schedulerv2.RegisterPeerRequest, stream schedulerv2.Scheduler_AnnouncePeerServer, mockHost *resource.Host, mockTask *resource.Task, mockPeer *resource.Peer,
+		req  *schedulerv2.RegisterSeedPeerRequest
+		run  func(t *testing.T, svc *V2, req *schedulerv2.RegisterSeedPeerRequest, peer *resource.Peer, seedPeer *resource.Peer, hostManager resource.HostManager, taskManager resource.TaskManager,
+			peerManager resource.PeerManager, stream schedulerv2.Scheduler_AnnouncePeerServer, mr *resource.MockResourceMockRecorder, mh *resource.MockHostManagerMockRecorder,
+			mt *resource.MockTaskManagerMockRecorder, mp *resource.MockPeerManagerMockRecorder, ma *schedulerv2mocks.MockScheduler_AnnouncePeerServerMockRecorder, ms *schedulingmocks.MockSchedulingMockRecorder)
+	}{
+		{
+			name: "host not found",
+			req:  &schedulerv2.RegisterSeedPeerRequest{},
+			run: func(t *testing.T, svc *V2, req *schedulerv2.RegisterSeedPeerRequest, peer *resource.Peer, seedPeer *resource.Peer, hostManager resource.HostManager, taskManager resource.TaskManager,
+				peerManager resource.PeerManager, stream schedulerv2.Scheduler_AnnouncePeerServer, mr *resource.MockResourceMockRecorder, mh *resource.MockHostManagerMockRecorder,
+				mt *resource.MockTaskManagerMockRecorder, mp *resource.MockPeerManagerMockRecorder, ma *schedulerv2mocks.MockScheduler_AnnouncePeerServerMockRecorder, ms *schedulingmocks.MockSchedulingMockRecorder) {
+				gomock.InOrder(
+					mr.HostManager().Return(hostManager).Times(1),
+					mh.Load(gomock.Eq(peer.Host.ID)).Return(nil, false).Times(1),
+				)
+
+				assert := assert.New(t)
+				assert.ErrorIs(svc.handleRegisterSeedPeerRequest(context.Background(), stream, peer.Host.ID, peer.Task.ID, peer.ID, req),
+					status.Errorf(codes.NotFound, "host %s not found", peer.Host.ID))
+			},
+		},
+		{
+			name: "can not found available peer",
+			req: &schedulerv2.RegisterSeedPeerRequest{
+				Download: &commonv2.Download{
+					Digest: mockTaskDigest.String(),
+				},
+			},
+			run: func(t *testing.T, svc *V2, req *schedulerv2.RegisterSeedPeerRequest, peer *resource.Peer, seedPeer *resource.Peer, hostManager resource.HostManager, taskManager resource.TaskManager,
+				peerManager resource.PeerManager, stream schedulerv2.Scheduler_AnnouncePeerServer, mr *resource.MockResourceMockRecorder, mh *resource.MockHostManagerMockRecorder,
+				mt *resource.MockTaskManagerMockRecorder, mp *resource.MockPeerManagerMockRecorder, ma *schedulerv2mocks.MockScheduler_AnnouncePeerServerMockRecorder, ms *schedulingmocks.MockSchedulingMockRecorder) {
+				gomock.InOrder(
+					mr.HostManager().Return(hostManager).Times(1),
+					mh.Load(gomock.Eq(peer.Host.ID)).Return(peer.Host, true).Times(1),
+					mr.TaskManager().Return(taskManager).Times(1),
+					mt.Load(gomock.Eq(peer.Task.ID)).Return(peer.Task, true).Times(1),
+					mr.PeerManager().Return(peerManager).Times(1),
+					mp.Load(gomock.Eq(peer.ID)).Return(peer, true).Times(1),
+					ms.ScheduleCandidateParents(gomock.Any(), gomock.Any(), gomock.Any()).Return(nil).Times(1),
+				)
+
+				peer.Priority = commonv2.Priority_LEVEL1
+
+				assert := assert.New(t)
+				assert.NoError(svc.handleRegisterSeedPeerRequest(context.Background(), stream, peer.Host.ID, peer.Task.ID, peer.ID, req))
+				assert.Equal(peer.NeedBackToSource.Load(), true)
+			},
+		},
+		{
+			name: "size scope is SizeScope_EMPTY and load AnnouncePeerStream failed",
+			req: &schedulerv2.RegisterSeedPeerRequest{
+				Download: &commonv2.Download{
+					Digest: mockTaskDigest.String(),
+				},
+			},
+			run: func(t *testing.T, svc *V2, req *schedulerv2.RegisterSeedPeerRequest, peer *resource.Peer, seedPeer *resource.Peer, hostManager resource.HostManager, taskManager resource.TaskManager,
+				peerManager resource.PeerManager, stream schedulerv2.Scheduler_AnnouncePeerServer, mr *resource.MockResourceMockRecorder, mh *resource.MockHostManagerMockRecorder,
+				mt *resource.MockTaskManagerMockRecorder, mp *resource.MockPeerManagerMockRecorder, ma *schedulerv2mocks.MockScheduler_AnnouncePeerServerMockRecorder, ms *schedulingmocks.MockSchedulingMockRecorder) {
+				gomock.InOrder(
+					mr.HostManager().Return(hostManager).Times(1),
+					mh.Load(gomock.Eq(peer.Host.ID)).Return(peer.Host, true).Times(1),
+					mr.TaskManager().Return(taskManager).Times(1),
+					mt.Load(gomock.Eq(peer.Task.ID)).Return(peer.Task, true).Times(1),
+					mr.PeerManager().Return(peerManager).Times(1),
+					mp.Load(gomock.Eq(peer.ID)).Return(peer, true).Times(1),
+				)
+
+				peer.Task.ContentLength.Store(0)
+				peer.Priority = commonv2.Priority_LEVEL6
+
+				assert := assert.New(t)
+				assert.ErrorIs(svc.handleRegisterSeedPeerRequest(context.Background(), nil, peer.Host.ID, peer.Task.ID, peer.ID, req),
+					status.Error(codes.NotFound, "AnnouncePeerStream not found"))
+				assert.Equal(peer.FSM.Current(), resource.PeerStatePending)
+			},
+		},
+		{
+			name: "size scope is SizeScope_EMPTY and event PeerEventRegisterEmpty failed",
+			req: &schedulerv2.RegisterSeedPeerRequest{
+				Download: &commonv2.Download{
+					Digest: mockTaskDigest.String(),
+				},
+			},
+			run: func(t *testing.T, svc *V2, req *schedulerv2.RegisterSeedPeerRequest, peer *resource.Peer, seedPeer *resource.Peer, hostManager resource.HostManager, taskManager resource.TaskManager,
+				peerManager resource.PeerManager, stream schedulerv2.Scheduler_AnnouncePeerServer, mr *resource.MockResourceMockRecorder, mh *resource.MockHostManagerMockRecorder,
+				mt *resource.MockTaskManagerMockRecorder, mp *resource.MockPeerManagerMockRecorder, ma *schedulerv2mocks.MockScheduler_AnnouncePeerServerMockRecorder, ms *schedulingmocks.MockSchedulingMockRecorder) {
+				gomock.InOrder(
+					mr.HostManager().Return(hostManager).Times(1),
+					mh.Load(gomock.Eq(peer.Host.ID)).Return(peer.Host, true).Times(1),
+					mr.TaskManager().Return(taskManager).Times(1),
+					mt.Load(gomock.Eq(peer.Task.ID)).Return(peer.Task, true).Times(1),
+					mr.PeerManager().Return(peerManager).Times(1),
+					mp.Load(gomock.Eq(peer.ID)).Return(peer, true).Times(1),
+				)
+
+				peer.Task.ContentLength.Store(0)
+				peer.Priority = commonv2.Priority_LEVEL6
+				peer.StoreAnnouncePeerStream(stream)
+				peer.FSM.SetState(resource.PeerStateReceivedEmpty)
+
+				assert := assert.New(t)
+				assert.ErrorIs(svc.handleRegisterSeedPeerRequest(context.Background(), nil, peer.Host.ID, peer.Task.ID, peer.ID, req),
+					status.Errorf(codes.Internal, "event RegisterEmpty inappropriate in current state ReceivedEmpty"))
+			},
+		},
+		{
+			name: "size scope is SizeScope_EMPTY and send EmptyTaskResponse failed",
+			req: &schedulerv2.RegisterSeedPeerRequest{
+				Download: &commonv2.Download{
+					Digest: mockTaskDigest.String(),
+				},
+			},
+			run: func(t *testing.T, svc *V2, req *schedulerv2.RegisterSeedPeerRequest, peer *resource.Peer, seedPeer *resource.Peer, hostManager resource.HostManager, taskManager resource.TaskManager,
+				peerManager resource.PeerManager, stream schedulerv2.Scheduler_AnnouncePeerServer, mr *resource.MockResourceMockRecorder, mh *resource.MockHostManagerMockRecorder,
+				mt *resource.MockTaskManagerMockRecorder, mp *resource.MockPeerManagerMockRecorder, ma *schedulerv2mocks.MockScheduler_AnnouncePeerServerMockRecorder, ms *schedulingmocks.MockSchedulingMockRecorder) {
+				gomock.InOrder(
+					mr.HostManager().Return(hostManager).Times(1),
+					mh.Load(gomock.Eq(peer.Host.ID)).Return(peer.Host, true).Times(1),
+					mr.TaskManager().Return(taskManager).Times(1),
+					mt.Load(gomock.Eq(peer.Task.ID)).Return(peer.Task, true).Times(1),
+					mr.PeerManager().Return(peerManager).Times(1),
+					mp.Load(gomock.Eq(peer.ID)).Return(peer, true).Times(1),
+					ma.Send(gomock.Eq(&schedulerv2.AnnouncePeerResponse{
+						Response: &schedulerv2.AnnouncePeerResponse_EmptyTaskResponse{
+							EmptyTaskResponse: &schedulerv2.EmptyTaskResponse{},
+						},
+					})).Return(errors.New("foo")).Times(1),
+				)
+
+				peer.Task.ContentLength.Store(0)
+				peer.Priority = commonv2.Priority_LEVEL6
+				peer.StoreAnnouncePeerStream(stream)
+
+				assert := assert.New(t)
+				assert.ErrorIs(svc.handleRegisterSeedPeerRequest(context.Background(), nil, peer.Host.ID, peer.Task.ID, peer.ID, req),
+					status.Errorf(codes.Internal, "foo"))
+				assert.Equal(peer.FSM.Current(), resource.PeerStateReceivedEmpty)
+			},
+		},
+		{
+			name: "size scope is SizeScope_TINY, task can not reuse DirectPiece and event PeerEventRegisterNormal failed",
+			req: &schedulerv2.RegisterSeedPeerRequest{
+				Download: &commonv2.Download{
+					Digest: mockTaskDigest.String(),
+				},
+			},
+			run: func(t *testing.T, svc *V2, req *schedulerv2.RegisterSeedPeerRequest, peer *resource.Peer, seedPeer *resource.Peer, hostManager resource.HostManager, taskManager resource.TaskManager,
+				peerManager resource.PeerManager, stream schedulerv2.Scheduler_AnnouncePeerServer, mr *resource.MockResourceMockRecorder, mh *resource.MockHostManagerMockRecorder,
+				mt *resource.MockTaskManagerMockRecorder, mp *resource.MockPeerManagerMockRecorder, ma *schedulerv2mocks.MockScheduler_AnnouncePeerServerMockRecorder, ms *schedulingmocks.MockSchedulingMockRecorder) {
+				gomock.InOrder(
+					mr.HostManager().Return(hostManager).Times(1),
+					mh.Load(gomock.Eq(peer.Host.ID)).Return(peer.Host, true).Times(1),
+					mr.TaskManager().Return(taskManager).Times(1),
+					mt.Load(gomock.Eq(peer.Task.ID)).Return(peer.Task, true).Times(1),
+					mr.PeerManager().Return(peerManager).Times(1),
+					mp.Load(gomock.Eq(peer.ID)).Return(peer, true).Times(1),
+				)
+
+				peer.Task.ContentLength.Store(1)
+				peer.Priority = commonv2.Priority_LEVEL6
+				peer.FSM.SetState(resource.PeerStateReceivedNormal)
+
+				assert := assert.New(t)
+				assert.ErrorIs(svc.handleRegisterSeedPeerRequest(context.Background(), nil, peer.Host.ID, peer.Task.ID, peer.ID, req),
+					status.Error(codes.Internal, "event RegisterNormal inappropriate in current state ReceivedNormal"))
+				assert.Equal(peer.FSM.Current(), resource.PeerStateReceivedNormal)
+			},
+		},
+		{
+			name: "size scope is SizeScope_TINY, task can not reuse DirectPiece and scheduling failed",
+			req: &schedulerv2.RegisterSeedPeerRequest{
+				Download: &commonv2.Download{
+					Digest: mockTaskDigest.String(),
+				},
+			},
+			run: func(t *testing.T, svc *V2, req *schedulerv2.RegisterSeedPeerRequest, peer *resource.Peer, seedPeer *resource.Peer, hostManager resource.HostManager, taskManager resource.TaskManager,
+				peerManager resource.PeerManager, stream schedulerv2.Scheduler_AnnouncePeerServer, mr *resource.MockResourceMockRecorder, mh *resource.MockHostManagerMockRecorder,
+				mt *resource.MockTaskManagerMockRecorder, mp *resource.MockPeerManagerMockRecorder, ma *schedulerv2mocks.MockScheduler_AnnouncePeerServerMockRecorder, ms *schedulingmocks.MockSchedulingMockRecorder) {
+				gomock.InOrder(
+					mr.HostManager().Return(hostManager).Times(1),
+					mh.Load(gomock.Eq(peer.Host.ID)).Return(peer.Host, true).Times(1),
+					mr.TaskManager().Return(taskManager).Times(1),
+					mt.Load(gomock.Eq(peer.Task.ID)).Return(peer.Task, true).Times(1),
+					mr.PeerManager().Return(peerManager).Times(1),
+					mp.Load(gomock.Eq(peer.ID)).Return(peer, true).Times(1),
+					ms.ScheduleCandidateParents(gomock.Any(), gomock.Any(), gomock.Any()).Return(errors.New("foo")).Times(1),
+				)
+
+				peer.Task.ContentLength.Store(1)
+				peer.Priority = commonv2.Priority_LEVEL6
+
+				assert := assert.New(t)
+				assert.ErrorIs(svc.handleRegisterSeedPeerRequest(context.Background(), nil, peer.Host.ID, peer.Task.ID, peer.ID, req),
+					status.Error(codes.FailedPrecondition, "foo"))
+				assert.Equal(peer.FSM.Current(), resource.PeerStateReceivedNormal)
+			},
+		},
+		{
+			name: "size scope is SizeScope_TINY and task can not reuse DirectPiece",
+			req: &schedulerv2.RegisterSeedPeerRequest{
+				Download: &commonv2.Download{
+					Digest: mockTaskDigest.String(),
+				},
+			},
+			run: func(t *testing.T, svc *V2, req *schedulerv2.RegisterSeedPeerRequest, peer *resource.Peer, seedPeer *resource.Peer, hostManager resource.HostManager, taskManager resource.TaskManager,
+				peerManager resource.PeerManager, stream schedulerv2.Scheduler_AnnouncePeerServer, mr *resource.MockResourceMockRecorder, mh *resource.MockHostManagerMockRecorder,
+				mt *resource.MockTaskManagerMockRecorder, mp *resource.MockPeerManagerMockRecorder, ma *schedulerv2mocks.MockScheduler_AnnouncePeerServerMockRecorder, ms *schedulingmocks.MockSchedulingMockRecorder) {
+				gomock.InOrder(
+					mr.HostManager().Return(hostManager).Times(1),
+					mh.Load(gomock.Eq(peer.Host.ID)).Return(peer.Host, true).Times(1),
+					mr.TaskManager().Return(taskManager).Times(1),
+					mt.Load(gomock.Eq(peer.Task.ID)).Return(peer.Task, true).Times(1),
+					mr.PeerManager().Return(peerManager).Times(1),
+					mp.Load(gomock.Eq(peer.ID)).Return(peer, true).Times(1),
+					ms.ScheduleCandidateParents(gomock.Any(), gomock.Any(), gomock.Any()).Return(nil).Times(1),
+				)
+
+				peer.Task.ContentLength.Store(1)
+				peer.Priority = commonv2.Priority_LEVEL6
+
+				assert := assert.New(t)
+				assert.NoError(svc.handleRegisterSeedPeerRequest(context.Background(), nil, peer.Host.ID, peer.Task.ID, peer.ID, req))
+				assert.Equal(peer.FSM.Current(), resource.PeerStateReceivedNormal)
+			},
+		},
+		{
+			name: "size scope is SizeScope_SMALL and task can not found success parent",
+			req: &schedulerv2.RegisterSeedPeerRequest{
+				Download: &commonv2.Download{
+					Digest: mockTaskDigest.String(),
+				},
+			},
+			run: func(t *testing.T, svc *V2, req *schedulerv2.RegisterSeedPeerRequest, peer *resource.Peer, seedPeer *resource.Peer, hostManager resource.HostManager, taskManager resource.TaskManager,
+				peerManager resource.PeerManager, stream schedulerv2.Scheduler_AnnouncePeerServer, mr *resource.MockResourceMockRecorder, mh *resource.MockHostManagerMockRecorder,
+				mt *resource.MockTaskManagerMockRecorder, mp *resource.MockPeerManagerMockRecorder, ma *schedulerv2mocks.MockScheduler_AnnouncePeerServerMockRecorder, ms *schedulingmocks.MockSchedulingMockRecorder) {
+				gomock.InOrder(
+					mr.HostManager().Return(hostManager).Times(1),
+					mh.Load(gomock.Eq(peer.Host.ID)).Return(peer.Host, true).Times(1),
+					mr.TaskManager().Return(taskManager).Times(1),
+					mt.Load(gomock.Eq(peer.Task.ID)).Return(peer.Task, true).Times(1),
+					mr.PeerManager().Return(peerManager).Times(1),
+					mp.Load(gomock.Eq(peer.ID)).Return(peer, true).Times(1),
+					ms.FindSuccessParent(gomock.Any(), gomock.Any(), gomock.Any()).Return(nil, false).Times(1),
+					ms.ScheduleCandidateParents(gomock.Any(), gomock.Any(), gomock.Any()).Return(nil).Times(1),
+				)
+
+				peer.Task.ContentLength.Store(129)
+				peer.Task.TotalPieceCount.Store(1)
+				peer.Priority = commonv2.Priority_LEVEL6
+
+				assert := assert.New(t)
+				assert.NoError(svc.handleRegisterSeedPeerRequest(context.Background(), nil, peer.Host.ID, peer.Task.ID, peer.ID, req))
+				assert.Equal(peer.FSM.Current(), resource.PeerStateReceivedNormal)
+			},
+		},
+		{
+			name: "size scope is SizeScope_SMALL and load AnnouncePeerStream failed",
+			req: &schedulerv2.RegisterSeedPeerRequest{
+				Download: &commonv2.Download{
+					Digest: mockTaskDigest.String(),
+				},
+			},
+			run: func(t *testing.T, svc *V2, req *schedulerv2.RegisterSeedPeerRequest, peer *resource.Peer, seedPeer *resource.Peer, hostManager resource.HostManager, taskManager resource.TaskManager,
+				peerManager resource.PeerManager, stream schedulerv2.Scheduler_AnnouncePeerServer, mr *resource.MockResourceMockRecorder, mh *resource.MockHostManagerMockRecorder,
+				mt *resource.MockTaskManagerMockRecorder, mp *resource.MockPeerManagerMockRecorder, ma *schedulerv2mocks.MockScheduler_AnnouncePeerServerMockRecorder, ms *schedulingmocks.MockSchedulingMockRecorder) {
+				gomock.InOrder(
+					mr.HostManager().Return(hostManager).Times(1),
+					mh.Load(gomock.Eq(peer.Host.ID)).Return(peer.Host, true).Times(1),
+					mr.TaskManager().Return(taskManager).Times(1),
+					mt.Load(gomock.Eq(peer.Task.ID)).Return(peer.Task, true).Times(1),
+					mr.PeerManager().Return(peerManager).Times(1),
+					mp.Load(gomock.Eq(peer.ID)).Return(peer, true).Times(1),
+					ms.FindSuccessParent(gomock.Any(), gomock.Any(), gomock.Any()).Return(seedPeer, true).Times(1),
+				)
+
+				peer.Task.ContentLength.Store(129)
+				peer.Task.TotalPieceCount.Store(1)
+				peer.Task.StorePeer(peer)
+				peer.Task.StorePeer(seedPeer)
+				peer.Priority = commonv2.Priority_LEVEL6
+
+				assert := assert.New(t)
+				assert.ErrorIs(svc.handleRegisterSeedPeerRequest(context.Background(), nil, peer.Host.ID, peer.Task.ID, peer.ID, req),
+					status.Error(codes.NotFound, "AnnouncePeerStream not found"))
+				assert.Equal(peer.FSM.Current(), resource.PeerStatePending)
+			},
+		},
+		{
+			name: "size scope is SizeScope_SMALL and event PeerEventRegisterSmall failed",
+			req: &schedulerv2.RegisterSeedPeerRequest{
+				Download: &commonv2.Download{
+					Digest: mockTaskDigest.String(),
+				},
+			},
+			run: func(t *testing.T, svc *V2, req *schedulerv2.RegisterSeedPeerRequest, peer *resource.Peer, seedPeer *resource.Peer, hostManager resource.HostManager, taskManager resource.TaskManager,
+				peerManager resource.PeerManager, stream schedulerv2.Scheduler_AnnouncePeerServer, mr *resource.MockResourceMockRecorder, mh *resource.MockHostManagerMockRecorder,
+				mt *resource.MockTaskManagerMockRecorder, mp *resource.MockPeerManagerMockRecorder, ma *schedulerv2mocks.MockScheduler_AnnouncePeerServerMockRecorder, ms *schedulingmocks.MockSchedulingMockRecorder) {
+				gomock.InOrder(
+					mr.HostManager().Return(hostManager).Times(1),
+					mh.Load(gomock.Eq(peer.Host.ID)).Return(peer.Host, true).Times(1),
+					mr.TaskManager().Return(taskManager).Times(1),
+					mt.Load(gomock.Eq(peer.Task.ID)).Return(peer.Task, true).Times(1),
+					mr.PeerManager().Return(peerManager).Times(1),
+					mp.Load(gomock.Eq(peer.ID)).Return(peer, true).Times(1),
+					ms.FindSuccessParent(gomock.Any(), gomock.Any(), gomock.Any()).Return(seedPeer, true).Times(1),
+				)
+
+				peer.Task.ContentLength.Store(129)
+				peer.Task.TotalPieceCount.Store(1)
+				peer.Task.StorePeer(peer)
+				peer.Task.StorePeer(seedPeer)
+				peer.Priority = commonv2.Priority_LEVEL6
+				peer.StoreAnnouncePeerStream(stream)
+				peer.FSM.SetState(resource.PeerStateReceivedSmall)
+
+				assert := assert.New(t)
+				assert.ErrorIs(svc.handleRegisterSeedPeerRequest(context.Background(), nil, peer.Host.ID, peer.Task.ID, peer.ID, req),
+					status.Error(codes.Internal, "event RegisterSmall inappropriate in current state ReceivedSmall"))
+				assert.Equal(peer.FSM.Current(), resource.PeerStateReceivedSmall)
+			},
+		},
+		{
+			name: "size scope is SizeScope_SMALL and send SmallTaskResponse failed",
+			req: &schedulerv2.RegisterSeedPeerRequest{
+				Download: &commonv2.Download{
+					Digest: mockTaskDigest.String(),
+				},
+			},
+			run: func(t *testing.T, svc *V2, req *schedulerv2.RegisterSeedPeerRequest, peer *resource.Peer, seedPeer *resource.Peer, hostManager resource.HostManager, taskManager resource.TaskManager,
+				peerManager resource.PeerManager, stream schedulerv2.Scheduler_AnnouncePeerServer, mr *resource.MockResourceMockRecorder, mh *resource.MockHostManagerMockRecorder,
+				mt *resource.MockTaskManagerMockRecorder, mp *resource.MockPeerManagerMockRecorder, ma *schedulerv2mocks.MockScheduler_AnnouncePeerServerMockRecorder, ms *schedulingmocks.MockSchedulingMockRecorder) {
+				gomock.InOrder(
+					mr.HostManager().Return(hostManager).Times(1),
+					mh.Load(gomock.Eq(peer.Host.ID)).Return(peer.Host, true).Times(1),
+					mr.TaskManager().Return(taskManager).Times(1),
+					mt.Load(gomock.Eq(peer.Task.ID)).Return(peer.Task, true).Times(1),
+					mr.PeerManager().Return(peerManager).Times(1),
+					mp.Load(gomock.Eq(peer.ID)).Return(peer, true).Times(1),
+					ms.FindSuccessParent(gomock.Any(), gomock.Any(), gomock.Any()).Return(seedPeer, true).Times(1),
+					ma.Send(gomock.Any()).Return(errors.New("foo")).Times(1),
+				)
+
+				peer.Task.ContentLength.Store(129)
+				peer.Task.TotalPieceCount.Store(1)
+				peer.Task.StorePeer(peer)
+				peer.Task.StorePeer(seedPeer)
+				peer.Priority = commonv2.Priority_LEVEL6
+				peer.StoreAnnouncePeerStream(stream)
+
+				assert := assert.New(t)
+				assert.ErrorIs(svc.handleRegisterSeedPeerRequest(context.Background(), nil, peer.Host.ID, peer.Task.ID, peer.ID, req),
+					status.Error(codes.Internal, "foo"))
+				assert.Equal(peer.FSM.Current(), resource.PeerStateReceivedSmall)
+			},
+		},
+		{
+			name: "size scope is SizeScope_SMALL",
+			req: &schedulerv2.RegisterSeedPeerRequest{
+				Download: &commonv2.Download{
+					Digest: mockTaskDigest.String(),
+				},
+			},
+			run: func(t *testing.T, svc *V2, req *schedulerv2.RegisterSeedPeerRequest, peer *resource.Peer, seedPeer *resource.Peer, hostManager resource.HostManager, taskManager resource.TaskManager,
+				peerManager resource.PeerManager, stream schedulerv2.Scheduler_AnnouncePeerServer, mr *resource.MockResourceMockRecorder, mh *resource.MockHostManagerMockRecorder,
+				mt *resource.MockTaskManagerMockRecorder, mp *resource.MockPeerManagerMockRecorder, ma *schedulerv2mocks.MockScheduler_AnnouncePeerServerMockRecorder, ms *schedulingmocks.MockSchedulingMockRecorder) {
+				gomock.InOrder(
+					mr.HostManager().Return(hostManager).Times(1),
+					mh.Load(gomock.Eq(peer.Host.ID)).Return(peer.Host, true).Times(1),
+					mr.TaskManager().Return(taskManager).Times(1),
+					mt.Load(gomock.Eq(peer.Task.ID)).Return(peer.Task, true).Times(1),
+					mr.PeerManager().Return(peerManager).Times(1),
+					mp.Load(gomock.Eq(peer.ID)).Return(peer, true).Times(1),
+					ms.FindSuccessParent(gomock.Any(), gomock.Any(), gomock.Any()).Return(seedPeer, true).Times(1),
+					ma.Send(gomock.Any()).Return(nil).Times(1),
+				)
+
+				peer.Task.ContentLength.Store(129)
+				peer.Task.TotalPieceCount.Store(1)
+				peer.Task.StorePeer(peer)
+				peer.Task.StorePeer(seedPeer)
+				peer.Priority = commonv2.Priority_LEVEL6
+				peer.StoreAnnouncePeerStream(stream)
+
+				assert := assert.New(t)
+				assert.NoError(svc.handleRegisterSeedPeerRequest(context.Background(), nil, peer.Host.ID, peer.Task.ID, peer.ID, req))
+				assert.Equal(peer.FSM.Current(), resource.PeerStateReceivedSmall)
+			},
+		},
+		{
+			name: "size scope is SizeScope_NORMAL",
+			req: &schedulerv2.RegisterSeedPeerRequest{
+				Download: &commonv2.Download{
+					Digest: mockTaskDigest.String(),
+				},
+			},
+			run: func(t *testing.T, svc *V2, req *schedulerv2.RegisterSeedPeerRequest, peer *resource.Peer, seedPeer *resource.Peer, hostManager resource.HostManager, taskManager resource.TaskManager,
+				peerManager resource.PeerManager, stream schedulerv2.Scheduler_AnnouncePeerServer, mr *resource.MockResourceMockRecorder, mh *resource.MockHostManagerMockRecorder,
+				mt *resource.MockTaskManagerMockRecorder, mp *resource.MockPeerManagerMockRecorder, ma *schedulerv2mocks.MockScheduler_AnnouncePeerServerMockRecorder, ms *schedulingmocks.MockSchedulingMockRecorder) {
+				gomock.InOrder(
+					mr.HostManager().Return(hostManager).Times(1),
+					mh.Load(gomock.Eq(peer.Host.ID)).Return(peer.Host, true).Times(1),
+					mr.TaskManager().Return(taskManager).Times(1),
+					mt.Load(gomock.Eq(peer.Task.ID)).Return(peer.Task, true).Times(1),
+					mr.PeerManager().Return(peerManager).Times(1),
+					mp.Load(gomock.Eq(peer.ID)).Return(peer, true).Times(1),
+					ms.ScheduleCandidateParents(gomock.Any(), gomock.Any(), gomock.Any()).Return(nil).Times(1),
+				)
+
+				peer.Task.ContentLength.Store(129)
+				peer.Task.TotalPieceCount.Store(2)
+				peer.Task.StorePeer(peer)
+				peer.Task.StorePeer(seedPeer)
+				peer.Priority = commonv2.Priority_LEVEL6
+				peer.StoreAnnouncePeerStream(stream)
+
+				assert := assert.New(t)
+				assert.NoError(svc.handleRegisterSeedPeerRequest(context.Background(), nil, peer.Host.ID, peer.Task.ID, peer.ID, req))
+				assert.Equal(peer.FSM.Current(), resource.PeerStateReceivedNormal)
+			},
+		},
+		{
+			name: "size scope is SizeScope_UNKNOW",
+			req: &schedulerv2.RegisterSeedPeerRequest{
+				Download: &commonv2.Download{
+					Digest: mockTaskDigest.String(),
+				},
+			},
+			run: func(t *testing.T, svc *V2, req *schedulerv2.RegisterSeedPeerRequest, peer *resource.Peer, seedPeer *resource.Peer, hostManager resource.HostManager, taskManager resource.TaskManager,
+				peerManager resource.PeerManager, stream schedulerv2.Scheduler_AnnouncePeerServer, mr *resource.MockResourceMockRecorder, mh *resource.MockHostManagerMockRecorder,
+				mt *resource.MockTaskManagerMockRecorder, mp *resource.MockPeerManagerMockRecorder, ma *schedulerv2mocks.MockScheduler_AnnouncePeerServerMockRecorder, ms *schedulingmocks.MockSchedulingMockRecorder) {
+				gomock.InOrder(
+					mr.HostManager().Return(hostManager).Times(1),
+					mh.Load(gomock.Eq(peer.Host.ID)).Return(peer.Host, true).Times(1),
+					mr.TaskManager().Return(taskManager).Times(1),
+					mt.Load(gomock.Eq(peer.Task.ID)).Return(peer.Task, true).Times(1),
+					mr.PeerManager().Return(peerManager).Times(1),
+					mp.Load(gomock.Eq(peer.ID)).Return(peer, true).Times(1),
+					ms.ScheduleCandidateParents(gomock.Any(), gomock.Any(), gomock.Any()).Return(nil).Times(1),
+				)
+
+				peer.Priority = commonv2.Priority_LEVEL6
+
+				assert := assert.New(t)
+				assert.NoError(svc.handleRegisterSeedPeerRequest(context.Background(), nil, peer.Host.ID, peer.Task.ID, peer.ID, req))
+				assert.Equal(peer.FSM.Current(), resource.PeerStateReceivedNormal)
+			},
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			ctl := gomock.NewController(t)
+			defer ctl.Finish()
+			scheduling := schedulingmocks.NewMockScheduling(ctl)
+			res := resource.NewMockResource(ctl)
+			dynconfig := configmocks.NewMockDynconfigInterface(ctl)
+			storage := storagemocks.NewMockStorage(ctl)
+			hostManager := resource.NewMockHostManager(ctl)
+			peerManager := resource.NewMockPeerManager(ctl)
+			taskManager := resource.NewMockTaskManager(ctl)
+			stream := schedulerv2mocks.NewMockScheduler_AnnouncePeerServer(ctl)
+
+			mockHost := resource.NewHost(
+				mockRawHost.ID, mockRawHost.IP, mockRawHost.Hostname,
+				mockRawHost.Port, mockRawHost.DownloadPort, mockRawHost.Type)
+			mockTask := resource.NewTask(mockTaskID, mockTaskURL, mockTaskTag, mockTaskApplication, commonv2.TaskType_DFDAEMON, mockTaskFilters, mockTaskHeader, mockTaskBackToSourceLimit, resource.WithDigest(mockTaskDigest), resource.WithPieceLength(mockTaskPieceLength))
+			peer := resource.NewPeer(mockPeerID, mockTask, mockHost)
+			seedPeer := resource.NewPeer(mockSeedPeerID, mockTask, mockHost)
+			svc := NewV2(&config.Config{Scheduler: mockSchedulerConfig}, res, scheduling, dynconfig, storage)
+
+			tc.run(t, svc, tc.req, peer, seedPeer, hostManager, taskManager, peerManager, stream, res.EXPECT(), hostManager.EXPECT(), taskManager.EXPECT(), peerManager.EXPECT(), stream.EXPECT(), scheduling.EXPECT())
+		})
+	}
+}
+
+func TestServiceV2_handleResource(t *testing.T) {
+	tests := []struct {
+		name     string
+		download *commonv2.Download
+		run      func(t *testing.T, svc *V2, download *commonv2.Download, stream schedulerv2.Scheduler_AnnouncePeerServer, mockHost *resource.Host, mockTask *resource.Task, mockPeer *resource.Peer,
 			hostManager resource.HostManager, taskManager resource.TaskManager, peerManager resource.PeerManager, mr *resource.MockResourceMockRecorder, mh *resource.MockHostManagerMockRecorder,
 			mt *resource.MockTaskManagerMockRecorder, mp *resource.MockPeerManagerMockRecorder)
 	}{
 		{
-			name: "host can not be loaded",
-			req:  &schedulerv2.RegisterPeerRequest{},
-			run: func(t *testing.T, svc *V2, req *schedulerv2.RegisterPeerRequest, stream schedulerv2.Scheduler_AnnouncePeerServer, mockHost *resource.Host, mockTask *resource.Task, mockPeer *resource.Peer,
+			name:     "host can not be loaded",
+			download: &commonv2.Download{},
+			run: func(t *testing.T, svc *V2, download *commonv2.Download, stream schedulerv2.Scheduler_AnnouncePeerServer, mockHost *resource.Host, mockTask *resource.Task, mockPeer *resource.Peer,
 				hostManager resource.HostManager, taskManager resource.TaskManager, peerManager resource.PeerManager, mr *resource.MockResourceMockRecorder, mh *resource.MockHostManagerMockRecorder,
 				mt *resource.MockTaskManagerMockRecorder, mp *resource.MockPeerManagerMockRecorder) {
 				gomock.InOrder(
@@ -1408,20 +1885,18 @@ func TestServiceV2_handleResource(t *testing.T) {
 				)
 
 				assert := assert.New(t)
-				_, _, _, err := svc.handleResource(context.Background(), stream, mockHost.ID, mockTask.ID, mockPeer.ID, req)
-				assert.EqualError(err, fmt.Sprintf("host %s not found", mockHost.ID))
+				_, _, _, err := svc.handleResource(context.Background(), stream, mockHost.ID, mockTask.ID, mockPeer.ID, download)
+				assert.ErrorIs(err, status.Errorf(codes.NotFound, "host %s not found", mockHost.ID))
 			},
 		},
 		{
 			name: "task can be loaded",
-			req: &schedulerv2.RegisterPeerRequest{
-				Download: &commonv2.Download{
-					Url:     "foo",
-					Filters: []string{"bar"},
-					Header:  map[string]string{"baz": "bas"},
-				},
+			download: &commonv2.Download{
+				Url:     "foo",
+				Filters: []string{"bar"},
+				Header:  map[string]string{"baz": "bas"},
 			},
-			run: func(t *testing.T, svc *V2, req *schedulerv2.RegisterPeerRequest, stream schedulerv2.Scheduler_AnnouncePeerServer, mockHost *resource.Host, mockTask *resource.Task, mockPeer *resource.Peer,
+			run: func(t *testing.T, svc *V2, download *commonv2.Download, stream schedulerv2.Scheduler_AnnouncePeerServer, mockHost *resource.Host, mockTask *resource.Task, mockPeer *resource.Peer,
 				hostManager resource.HostManager, taskManager resource.TaskManager, peerManager resource.PeerManager, mr *resource.MockResourceMockRecorder, mh *resource.MockHostManagerMockRecorder,
 				mt *resource.MockTaskManagerMockRecorder, mp *resource.MockPeerManagerMockRecorder) {
 				gomock.InOrder(
@@ -1434,26 +1909,24 @@ func TestServiceV2_handleResource(t *testing.T) {
 				)
 
 				assert := assert.New(t)
-				host, task, _, err := svc.handleResource(context.Background(), stream, mockHost.ID, mockTask.ID, mockPeer.ID, req)
+				host, task, _, err := svc.handleResource(context.Background(), stream, mockHost.ID, mockTask.ID, mockPeer.ID, download)
 				assert.NoError(err)
 				assert.EqualValues(host, mockHost)
 				assert.Equal(task.ID, mockTask.ID)
-				assert.Equal(task.URL, req.Download.Url)
-				assert.EqualValues(task.Filters, req.Download.Filters)
-				assert.EqualValues(task.Header, req.Download.Header)
+				assert.Equal(task.URL, download.Url)
+				assert.EqualValues(task.Filters, download.Filters)
+				assert.EqualValues(task.Header, download.Header)
 			},
 		},
 		{
 			name: "task can not be loaded",
-			req: &schedulerv2.RegisterPeerRequest{
-				Download: &commonv2.Download{
-					Url:     "foo",
-					Filters: []string{"bar"},
-					Header:  map[string]string{"baz": "bas"},
-					Digest:  mockTaskDigest.String(),
-				},
+			download: &commonv2.Download{
+				Url:     "foo",
+				Filters: []string{"bar"},
+				Header:  map[string]string{"baz": "bas"},
+				Digest:  mockTaskDigest.String(),
 			},
-			run: func(t *testing.T, svc *V2, req *schedulerv2.RegisterPeerRequest, stream schedulerv2.Scheduler_AnnouncePeerServer, mockHost *resource.Host, mockTask *resource.Task, mockPeer *resource.Peer,
+			run: func(t *testing.T, svc *V2, download *commonv2.Download, stream schedulerv2.Scheduler_AnnouncePeerServer, mockHost *resource.Host, mockTask *resource.Task, mockPeer *resource.Peer,
 				hostManager resource.HostManager, taskManager resource.TaskManager, peerManager resource.PeerManager, mr *resource.MockResourceMockRecorder, mh *resource.MockHostManagerMockRecorder,
 				mt *resource.MockTaskManagerMockRecorder, mp *resource.MockPeerManagerMockRecorder) {
 				gomock.InOrder(
@@ -1468,24 +1941,22 @@ func TestServiceV2_handleResource(t *testing.T) {
 				)
 
 				assert := assert.New(t)
-				host, task, _, err := svc.handleResource(context.Background(), stream, mockHost.ID, mockTask.ID, mockPeer.ID, req)
+				host, task, _, err := svc.handleResource(context.Background(), stream, mockHost.ID, mockTask.ID, mockPeer.ID, download)
 				assert.NoError(err)
 				assert.EqualValues(host, mockHost)
 				assert.Equal(task.ID, mockTask.ID)
-				assert.Equal(task.Digest.String(), req.Download.Digest)
-				assert.Equal(task.URL, req.Download.Url)
-				assert.EqualValues(task.Filters, req.Download.Filters)
-				assert.EqualValues(task.Header, req.Download.Header)
+				assert.Equal(task.Digest.String(), download.Digest)
+				assert.Equal(task.URL, download.Url)
+				assert.EqualValues(task.Filters, download.Filters)
+				assert.EqualValues(task.Header, download.Header)
 			},
 		},
 		{
 			name: "invalid digest",
-			req: &schedulerv2.RegisterPeerRequest{
-				Download: &commonv2.Download{
-					Digest: "foo",
-				},
+			download: &commonv2.Download{
+				Digest: "foo",
 			},
-			run: func(t *testing.T, svc *V2, req *schedulerv2.RegisterPeerRequest, stream schedulerv2.Scheduler_AnnouncePeerServer, mockHost *resource.Host, mockTask *resource.Task, mockPeer *resource.Peer,
+			run: func(t *testing.T, svc *V2, download *commonv2.Download, stream schedulerv2.Scheduler_AnnouncePeerServer, mockHost *resource.Host, mockTask *resource.Task, mockPeer *resource.Peer,
 				hostManager resource.HostManager, taskManager resource.TaskManager, peerManager resource.PeerManager, mr *resource.MockResourceMockRecorder, mh *resource.MockHostManagerMockRecorder,
 				mt *resource.MockTaskManagerMockRecorder, mp *resource.MockPeerManagerMockRecorder) {
 				gomock.InOrder(
@@ -1496,21 +1967,19 @@ func TestServiceV2_handleResource(t *testing.T) {
 				)
 
 				assert := assert.New(t)
-				_, _, _, err := svc.handleResource(context.Background(), stream, mockHost.ID, mockTask.ID, mockPeer.ID, req)
-				assert.EqualError(err, "invalid digest foo")
+				_, _, _, err := svc.handleResource(context.Background(), stream, mockHost.ID, mockTask.ID, mockPeer.ID, download)
+				assert.ErrorIs(err, status.Error(codes.InvalidArgument, "invalid digest"))
 			},
 		},
 		{
 			name: "peer can be loaded",
-			req: &schedulerv2.RegisterPeerRequest{
-				Download: &commonv2.Download{
-					Url:     "foo",
-					Filters: []string{"bar"},
-					Header:  map[string]string{"baz": "bas"},
-					Digest:  mockTaskDigest.String(),
-				},
+			download: &commonv2.Download{
+				Url:     "foo",
+				Filters: []string{"bar"},
+				Header:  map[string]string{"baz": "bas"},
+				Digest:  mockTaskDigest.String(),
 			},
-			run: func(t *testing.T, svc *V2, req *schedulerv2.RegisterPeerRequest, stream schedulerv2.Scheduler_AnnouncePeerServer, mockHost *resource.Host, mockTask *resource.Task, mockPeer *resource.Peer,
+			run: func(t *testing.T, svc *V2, download *commonv2.Download, stream schedulerv2.Scheduler_AnnouncePeerServer, mockHost *resource.Host, mockTask *resource.Task, mockPeer *resource.Peer,
 				hostManager resource.HostManager, taskManager resource.TaskManager, peerManager resource.PeerManager, mr *resource.MockResourceMockRecorder, mh *resource.MockHostManagerMockRecorder,
 				mt *resource.MockTaskManagerMockRecorder, mp *resource.MockPeerManagerMockRecorder) {
 				gomock.InOrder(
@@ -1523,33 +1992,31 @@ func TestServiceV2_handleResource(t *testing.T) {
 				)
 
 				assert := assert.New(t)
-				host, task, peer, err := svc.handleResource(context.Background(), stream, mockHost.ID, mockTask.ID, mockPeer.ID, req)
+				host, task, peer, err := svc.handleResource(context.Background(), stream, mockHost.ID, mockTask.ID, mockPeer.ID, download)
 				assert.NoError(err)
 				assert.EqualValues(host, mockHost)
 				assert.Equal(task.ID, mockTask.ID)
-				assert.Equal(task.Digest.String(), req.Download.Digest)
-				assert.Equal(task.URL, req.Download.Url)
-				assert.EqualValues(task.Filters, req.Download.Filters)
-				assert.EqualValues(task.Header, req.Download.Header)
+				assert.Equal(task.Digest.String(), download.Digest)
+				assert.Equal(task.URL, download.Url)
+				assert.EqualValues(task.Filters, download.Filters)
+				assert.EqualValues(task.Header, download.Header)
 				assert.EqualValues(peer, mockPeer)
 			},
 		},
 		{
 			name: "peer can not be loaded",
-			req: &schedulerv2.RegisterPeerRequest{
-				Download: &commonv2.Download{
-					Url:      "foo",
-					Filters:  []string{"bar"},
-					Header:   map[string]string{"baz": "bas"},
-					Digest:   mockTaskDigest.String(),
-					Priority: commonv2.Priority_LEVEL1,
-					Range: &commonv2.Range{
-						Start:  mockPeerRange.Start,
-						Length: mockPeerRange.Length,
-					},
+			download: &commonv2.Download{
+				Url:      "foo",
+				Filters:  []string{"bar"},
+				Header:   map[string]string{"baz": "bas"},
+				Digest:   mockTaskDigest.String(),
+				Priority: commonv2.Priority_LEVEL1,
+				Range: &commonv2.Range{
+					Start:  mockPeerRange.Start,
+					Length: mockPeerRange.Length,
 				},
 			},
-			run: func(t *testing.T, svc *V2, req *schedulerv2.RegisterPeerRequest, stream schedulerv2.Scheduler_AnnouncePeerServer, mockHost *resource.Host, mockTask *resource.Task, mockPeer *resource.Peer,
+			run: func(t *testing.T, svc *V2, download *commonv2.Download, stream schedulerv2.Scheduler_AnnouncePeerServer, mockHost *resource.Host, mockTask *resource.Task, mockPeer *resource.Peer,
 				hostManager resource.HostManager, taskManager resource.TaskManager, peerManager resource.PeerManager, mr *resource.MockResourceMockRecorder, mh *resource.MockHostManagerMockRecorder,
 				mt *resource.MockTaskManagerMockRecorder, mp *resource.MockPeerManagerMockRecorder) {
 				gomock.InOrder(
@@ -1564,18 +2031,18 @@ func TestServiceV2_handleResource(t *testing.T) {
 				)
 
 				assert := assert.New(t)
-				host, task, peer, err := svc.handleResource(context.Background(), stream, mockHost.ID, mockTask.ID, mockPeer.ID, req)
+				host, task, peer, err := svc.handleResource(context.Background(), stream, mockHost.ID, mockTask.ID, mockPeer.ID, download)
 				assert.NoError(err)
 				assert.EqualValues(host, mockHost)
 				assert.Equal(task.ID, mockTask.ID)
-				assert.Equal(task.Digest.String(), req.Download.Digest)
-				assert.Equal(task.URL, req.Download.Url)
-				assert.EqualValues(task.Filters, req.Download.Filters)
-				assert.EqualValues(task.Header, req.Download.Header)
+				assert.Equal(task.Digest.String(), download.Digest)
+				assert.Equal(task.URL, download.Url)
+				assert.EqualValues(task.Filters, download.Filters)
+				assert.EqualValues(task.Header, download.Header)
 				assert.Equal(peer.ID, mockPeer.ID)
-				assert.Equal(peer.Priority, req.Download.Priority)
-				assert.Equal(peer.Range.Start, req.Download.Range.Start)
-				assert.Equal(peer.Range.Length, req.Download.Range.Length)
+				assert.Equal(peer.Priority, download.Priority)
+				assert.Equal(peer.Range.Start, download.Range.Start)
+				assert.Equal(peer.Range.Length, download.Range.Length)
 				assert.NotNil(peer.AnnouncePeerStream)
 				assert.EqualValues(peer.Host, mockHost)
 				assert.EqualValues(peer.Task, mockTask)
@@ -1603,7 +2070,7 @@ func TestServiceV2_handleResource(t *testing.T) {
 			mockPeer := resource.NewPeer(mockPeerID, mockTask, mockHost)
 			svc := NewV2(&config.Config{Scheduler: mockSchedulerConfig}, res, scheduling, dynconfig, storage)
 
-			tc.run(t, svc, tc.req, stream, mockHost, mockTask, mockPeer, hostManager, taskManager, peerManager, res.EXPECT(), hostManager.EXPECT(), taskManager.EXPECT(), peerManager.EXPECT())
+			tc.run(t, svc, tc.download, stream, mockHost, mockTask, mockPeer, hostManager, taskManager, peerManager, res.EXPECT(), hostManager.EXPECT(), taskManager.EXPECT(), peerManager.EXPECT())
 		})
 	}
 }