diff --git a/internal/datanode/allocator.go b/internal/datanode/allocator.go
index ebb6a0bc86..e86bf6cd28 100644
--- a/internal/datanode/allocator.go
+++ b/internal/datanode/allocator.go
@@ -32,6 +32,7 @@ type allocator struct {
 	rootCoord types.RootCoord
 }
 
+// check if allocator implements allocatorInterface
 var _ allocatorInterface = &allocator{}
 
 func newAllocator(s types.RootCoord) *allocator {
@@ -40,7 +41,7 @@ func newAllocator(s types.RootCoord) *allocator {
 	}
 }
 
-// allocID allocate one ID from rootCoord
+// allocID allocates one ID from rootCoord
 func (alloc *allocator) allocID() (UniqueID, error) {
 	ctx := context.TODO()
 	resp, err := alloc.rootCoord.AllocID(ctx, &rootcoordpb.AllocIDRequest{
diff --git a/internal/datanode/meta_service.go b/internal/datanode/meta_service.go
index 04c68490ee..9b0303496f 100644
--- a/internal/datanode/meta_service.go
+++ b/internal/datanode/meta_service.go
@@ -33,7 +33,7 @@ type metaService struct {
 	rootCoord    types.RootCoord
 }
 
-// newMetaService creates a new metaService with provided RootCoord and collectionID
+// newMetaService creates a new metaService with provided RootCoord and collectionID.
 func newMetaService(rc types.RootCoord, collectionID UniqueID) *metaService {
 	return &metaService{
 		rootCoord:    rc,
@@ -41,7 +41,7 @@ func newMetaService(rc types.RootCoord, collectionID UniqueID) *metaService {
 	}
 }
 
-// getCollectionSchema get collection schema with provided collection id at specified timestamp
+// getCollectionSchema get collection schema with provided collection id at specified timestamp.
 func (mService *metaService) getCollectionSchema(ctx context.Context, collID UniqueID, timestamp Timestamp) (*schemapb.CollectionSchema, error) {
 	req := &milvuspb.DescribeCollectionRequest{
 		Base: &commonpb.MsgBase{
@@ -67,8 +67,7 @@ func (mService *metaService) getCollectionSchema(ctx context.Context, collID Uni
 	return response.GetSchema(), nil
 }
 
-// printCollectionStruct util function to print schema data
-// used in tests only
+// printCollectionStruct util function to print schema data, used in tests only.
 func printCollectionStruct(obj *etcdpb.CollectionMeta) {
 	v := reflect.ValueOf(obj)
 	v = reflect.Indirect(v)