diff --git a/internal/dataservice/channel.go b/internal/dataservice/channel.go
index e88b9030b0..d67b16c95a 100644
--- a/internal/dataservice/channel.go
+++ b/internal/dataservice/channel.go
@@ -31,11 +31,11 @@ func newInsertChannelManager() *insertChannelManager {
 	}
 }
 
-func (cm *insertChannelManager) AllocChannels(collectionID UniqueID, groupNum int) ([]channelGroup, error) {
+func (cm *insertChannelManager) GetChannels(collectionID UniqueID, groupNum int) ([]channelGroup, error) {
 	cm.mu.Lock()
 	defer cm.mu.Unlock()
 	if _, ok := cm.channelGroups[collectionID]; ok {
-		return nil, fmt.Errorf("channel group of collection %d already exist", collectionID)
+		return cm.channelGroups[collectionID], nil
 	}
 	channels := Params.InsertChannelNumPerCollection
 	m, n := channels/int64(groupNum), channels%int64(groupNum)
@@ -74,19 +74,3 @@ func (cm *insertChannelManager) GetChannelGroup(collectionID UniqueID, channelNa
 	}
 	return nil, fmt.Errorf("channel name %s not found", channelName)
 }
-
-func (cm *insertChannelManager) ContainsCollection(collectionID UniqueID) (bool, []string) {
-	cm.mu.RLock()
-	defer cm.mu.RUnlock()
-	_, ok := cm.channelGroups[collectionID]
-	if !ok {
-		return false, nil
-	}
-	ret := make([]string, 0)
-	for _, cr := range cm.channelGroups[collectionID] {
-		for _, c := range cr {
-			ret = append(ret, c)
-		}
-	}
-	return true, ret
-}
diff --git a/internal/dataservice/channel_test.go b/internal/dataservice/channel_test.go
index e05884c368..70a1dab871 100644
--- a/internal/dataservice/channel_test.go
+++ b/internal/dataservice/channel_test.go
@@ -14,19 +14,14 @@ func TestChannelAllocation(t *testing.T) {
 		collectionID   UniqueID
 		groupNum       int
 		expectGroupNum int
-		success        bool
 	}{
-		{1, 4, 4, true},
-		{1, 4, 4, false},
-		{2, 1, 1, true},
-		{3, 5, 4, true},
+		{1, 4, 4},
+		{1, 4, 4},
+		{2, 1, 1},
+		{3, 5, 4},
 	}
 	for _, c := range cases {
-		channels, err := manager.AllocChannels(c.collectionID, c.expectGroupNum)
-		if !c.success {
-			assert.NotNil(t, err)
-			continue
-		}
+		channels, err := manager.GetChannels(c.collectionID, c.expectGroupNum)
 		assert.Nil(t, err)
 		assert.EqualValues(t, c.expectGroupNum, len(channels))
 		total := 0
diff --git a/internal/dataservice/server.go b/internal/dataservice/server.go
index 3495643ed0..9ae8d3f205 100644
--- a/internal/dataservice/server.go
+++ b/internal/dataservice/server.go
@@ -682,11 +682,7 @@ func (s *Server) GetInsertChannels(req *datapb.InsertChannelRequest) ([]string,
 	if !s.checkStateIsHealthy() {
 		return nil, errors.New("server is initializing")
 	}
-	contains, ret := s.insertChannelMgr.ContainsCollection(req.CollectionID)
-	if contains {
-		return ret, nil
-	}
-	channelGroups, err := s.insertChannelMgr.AllocChannels(req.CollectionID, s.cluster.GetNumOfNodes())
+	channelGroups, err := s.insertChannelMgr.GetChannels(req.CollectionID, s.cluster.GetNumOfNodes())
 	if err != nil {
 		return nil, err
 	}
@@ -696,7 +692,6 @@ func (s *Server) GetInsertChannels(req *datapb.InsertChannelRequest) ([]string,
 		channels = append(channels, group...)
 	}
 	s.cluster.WatchInsertChannels(channelGroups)
-
 	return channels, nil
 }