Fix collection not exist when tried to do recovery (#21471)

Signed-off-by: longjiquan <jiquan.long@zilliz.com>

Makefile

@@ -291,6 +291,9 @@ rpm: install
 mock-datanode:
 	mockery --name=DataNode --dir=$(PWD)/internal/types --output=$(PWD)/internal/mocks --filename=mock_datanode.go --with-expecter
 
+mock-rootcoord:
+	mockery --name=RootCoord --dir=$(PWD)/internal/types --output=$(PWD)/internal/mocks --filename=mock_rootcoord.go --with-expecter
+
 mock-tnx-kv:
 	mockery --name=TxnKV --dir=$(PWD)/internal/kv --output=$(PWD)/internal/kv/mocks --filename=TxnKV.go --with-expecter
 

internal/common/error.go

@@ -119,3 +119,22 @@ func IsCollectionNotExistError(e error) bool {
 	}
 	return false
 }
+
+func IsCollectionNotExistErrorV2(e error) bool {
+	statusError, ok := e.(*statusError)
+	if !ok {
+		return false
+	}
+	return statusError.GetErrorCode() == commonpb.ErrorCode_CollectionNotExists
+}
+
+func StatusFromError(e error) *commonpb.Status {
+	if e == nil {
+		return &commonpb.Status{ErrorCode: commonpb.ErrorCode_Success}
+	}
+	statusError, ok := e.(*statusError)
+	if !ok {
+		return &commonpb.Status{ErrorCode: commonpb.ErrorCode_UnexpectedError, Reason: e.Error()}
+	}
+	return &commonpb.Status{ErrorCode: statusError.GetErrorCode(), Reason: statusError.GetReason()}
+}

internal/common/error_test.go

@@ -61,3 +61,21 @@ func Test_IsCollectionNotExistError(t *testing.T) {
 	assert.True(t, IsCollectionNotExistError(NewCollectionNotExistError("collection not exist")))
 	assert.False(t, IsCollectionNotExistError(NewStatusError(commonpb.ErrorCode_BuildIndexError, "")))
 }
+
+func TestIsCollectionNotExistErrorV2(t *testing.T) {
+	assert.False(t, IsCollectionNotExistErrorV2(nil))
+	assert.False(t, IsCollectionNotExistErrorV2(errors.New("not status error")))
+	assert.True(t, IsCollectionNotExistErrorV2(NewCollectionNotExistError("collection not exist")))
+	assert.False(t, IsCollectionNotExistErrorV2(NewStatusError(commonpb.ErrorCode_BuildIndexError, "")))
+}
+
+func TestStatusFromError(t *testing.T) {
+	var status *commonpb.Status
+	status = StatusFromError(nil)
+	assert.Equal(t, commonpb.ErrorCode_Success, status.GetErrorCode())
+	status = StatusFromError(errors.New("not status error"))
+	assert.Equal(t, commonpb.ErrorCode_UnexpectedError, status.GetErrorCode())
+	assert.Equal(t, "not status error", status.GetReason())
+	status = StatusFromError(NewCollectionNotExistError("collection not exist"))
+	assert.Equal(t, commonpb.ErrorCode_CollectionNotExists, status.GetErrorCode())
+}

internal/datacoord/compaction_trigger.go

@@ -453,6 +453,7 @@ func (t *compactionTrigger) handleSignal(signal *compactionSignal) {
 	isDiskIndex, err := t.updateSegmentMaxSize(segments)
 	if err != nil {
 		log.Warn("failed to update segment max size", zap.Error(err))
+		return
 	}
 
 	ts, err := t.allocTs()

internal/datacoord/mock_test.go

@@ -365,6 +365,10 @@ func (m *mockRootCoordService) DescribeCollection(ctx context.Context, req *milv
 	}, nil
 }
 
+func (m *mockRootCoordService) DescribeCollectionInternal(ctx context.Context, req *milvuspb.DescribeCollectionRequest) (*milvuspb.DescribeCollectionResponse, error) {
+	return m.DescribeCollection(ctx, req)
+}
+
 func (m *mockRootCoordService) ShowCollections(ctx context.Context, req *milvuspb.ShowCollectionsRequest) (*milvuspb.ShowCollectionsResponse, error) {
 	return &milvuspb.ShowCollectionsResponse{
 		Status: &commonpb.Status{
@@ -402,6 +406,10 @@ func (m *mockRootCoordService) ShowPartitions(ctx context.Context, req *milvuspb
 	}, nil
 }
 
+func (m *mockRootCoordService) ShowPartitionsInternal(ctx context.Context, req *milvuspb.ShowPartitionsRequest) (*milvuspb.ShowPartitionsResponse, error) {
+	return m.ShowPartitions(ctx, req)
+}
+
 //global timestamp allocator
 func (m *mockRootCoordService) AllocTimestamp(ctx context.Context, req *rootcoordpb.AllocTimestampRequest) (*rootcoordpb.AllocTimestampResponse, error) {
 	if m.state != commonpb.StateCode_Healthy {

internal/datacoord/server.go

@@ -860,7 +860,7 @@ func (s *Server) stopServerLoop() {
 // loadCollectionFromRootCoord communicates with RootCoord and asks for collection information.
 // collection information will be added to server meta info.
 func (s *Server) loadCollectionFromRootCoord(ctx context.Context, collectionID int64) error {
-	resp, err := s.rootCoordClient.DescribeCollection(ctx, &milvuspb.DescribeCollectionRequest{
+	resp, err := s.rootCoordClient.DescribeCollectionInternal(ctx, &milvuspb.DescribeCollectionRequest{
 		Base: commonpbutil.NewMsgBase(
 			commonpbutil.WithMsgType(commonpb.MsgType_DescribeCollection),
 			commonpbutil.WithSourceID(paramtable.GetNodeID()),
@@ -871,7 +871,7 @@ func (s *Server) loadCollectionFromRootCoord(ctx context.Context, collectionID i
 	if err = VerifyResponse(resp, err); err != nil {
 		return err
 	}
-	presp, err := s.rootCoordClient.ShowPartitions(ctx, &milvuspb.ShowPartitionsRequest{
+	presp, err := s.rootCoordClient.ShowPartitionsInternal(ctx, &milvuspb.ShowPartitionsRequest{
 		Base: commonpbutil.NewMsgBase(
 			commonpbutil.WithMsgType(commonpb.MsgType_ShowPartitions),
 			commonpbutil.WithMsgID(0),

internal/datacoord/server_test.go

@@ -202,7 +202,7 @@ type mockRootCoord struct {
 	collID UniqueID
 }
 
-func (r *mockRootCoord) DescribeCollection(ctx context.Context, req *milvuspb.DescribeCollectionRequest) (*milvuspb.DescribeCollectionResponse, error) {
+func (r *mockRootCoord) DescribeCollectionInternal(ctx context.Context, req *milvuspb.DescribeCollectionRequest) (*milvuspb.DescribeCollectionResponse, error) {
 	if req.CollectionID != r.collID {
 		return &milvuspb.DescribeCollectionResponse{
 			Status: &commonpb.Status{

internal/datacoord/services.go

@@ -157,6 +157,7 @@ func (s *Server) AssignSegmentID(ctx context.Context, req *datapb.AssignSegmentI
 			zap.Int64("import task ID", r.GetImportTaskID()))
 
 		// Load the collection info from Root Coordinator, if it is not found in server meta.
+		// Note: this request wouldn't be received if collection didn't exist.
 		_, err := s.handler.GetCollection(ctx, r.GetCollectionID())
 		if err != nil {
 			log.Warn("cannot get collection schema", zap.Error(err))
@@ -614,7 +615,7 @@ func (s *Server) GetRecoveryInfo(ctx context.Context, req *datapb.GetRecoveryInf
 		return resp, nil
 	}
 
-	dresp, err := s.rootCoordClient.DescribeCollection(s.ctx, &milvuspb.DescribeCollectionRequest{
+	dresp, err := s.rootCoordClient.DescribeCollectionInternal(s.ctx, &milvuspb.DescribeCollectionRequest{
 		Base: commonpbutil.NewMsgBase(
 			commonpbutil.WithMsgType(commonpb.MsgType_DescribeCollection),
 			commonpbutil.WithSourceID(paramtable.GetNodeID()),

internal/datanode/meta_service.go

@@ -70,7 +70,7 @@ func (mService *metaService) getCollectionInfo(ctx context.Context, collID Uniqu
 		TimeStamp:    timestamp,
 	}
 
-	response, err := mService.rootCoord.DescribeCollection(ctx, req)
+	response, err := mService.rootCoord.DescribeCollectionInternal(ctx, req)
 	if err != nil {
 		return nil, fmt.Errorf("grpc error when describe collection %v from rootcoord: %s", collID, err.Error())
 	}

internal/datanode/meta_service_test.go

@@ -65,8 +65,8 @@ type RootCoordFails1 struct {
 	RootCoordFactory
 }
 
-// DescribeCollection override method that will fails
+// DescribeCollectionInternal override method that will fails
-func (rc *RootCoordFails1) DescribeCollection(ctx context.Context, req *milvuspb.DescribeCollectionRequest) (*milvuspb.DescribeCollectionResponse, error) {
+func (rc *RootCoordFails1) DescribeCollectionInternal(ctx context.Context, req *milvuspb.DescribeCollectionRequest) (*milvuspb.DescribeCollectionResponse, error) {
 	return nil, errors.New("always fail")
 }
 
@@ -75,8 +75,8 @@ type RootCoordFails2 struct {
 	RootCoordFactory
 }
 
-// DescribeCollection override method that will fails
+// DescribeCollectionInternal override method that will fails
-func (rc *RootCoordFails2) DescribeCollection(ctx context.Context, req *milvuspb.DescribeCollectionRequest) (*milvuspb.DescribeCollectionResponse, error) {
+func (rc *RootCoordFails2) DescribeCollectionInternal(ctx context.Context, req *milvuspb.DescribeCollectionRequest) (*milvuspb.DescribeCollectionResponse, error) {
 	return &milvuspb.DescribeCollectionResponse{
 		Status: &commonpb.Status{ErrorCode: commonpb.ErrorCode_UnexpectedError},
 	}, nil

internal/datanode/mock_test.go

@@ -1001,7 +1001,7 @@ func (m *RootCoordFactory) ShowCollections(ctx context.Context, in *milvuspb.Sho
 
 }
 
-func (m *RootCoordFactory) DescribeCollection(ctx context.Context, in *milvuspb.DescribeCollectionRequest) (*milvuspb.DescribeCollectionResponse, error) {
+func (m *RootCoordFactory) DescribeCollectionInternal(ctx context.Context, in *milvuspb.DescribeCollectionRequest) (*milvuspb.DescribeCollectionResponse, error) {
 	f := MetaFactory{}
 	meta := f.GetCollectionMeta(m.collectionID, m.collectionName, m.pkType)
 	resp := &milvuspb.DescribeCollectionResponse{

internal/distributed/proxy/service_test.go

@@ -143,6 +143,10 @@ func (m *MockRootCoord) DescribeCollection(ctx context.Context, req *milvuspb.De
 	return nil, nil
 }
 
+func (m *MockRootCoord) DescribeCollectionInternal(ctx context.Context, req *milvuspb.DescribeCollectionRequest) (*milvuspb.DescribeCollectionResponse, error) {
+	return nil, nil
+}
+
 func (m *MockRootCoord) ShowCollections(ctx context.Context, req *milvuspb.ShowCollectionsRequest) (*milvuspb.ShowCollectionsResponse, error) {
 	return nil, nil
 }
@@ -167,6 +171,10 @@ func (m *MockRootCoord) ShowPartitions(ctx context.Context, req *milvuspb.ShowPa
 	return nil, nil
 }
 
+func (m *MockRootCoord) ShowPartitionsInternal(ctx context.Context, req *milvuspb.ShowPartitionsRequest) (*milvuspb.ShowPartitionsResponse, error) {
+	return nil, nil
+}
+
 func (m *MockRootCoord) CreateAlias(ctx context.Context, req *milvuspb.CreateAliasRequest) (*commonpb.Status, error) {
 	return nil, nil
 }

internal/distributed/rootcoord/client/client.go

@@ -239,6 +239,25 @@ func (c *Client) DescribeCollection(ctx context.Context, in *milvuspb.DescribeCo
 	return ret.(*milvuspb.DescribeCollectionResponse), err
 }
 
+// DescribeCollectionInternal return collection info
+func (c *Client) DescribeCollectionInternal(ctx context.Context, in *milvuspb.DescribeCollectionRequest) (*milvuspb.DescribeCollectionResponse, error) {
+	in = typeutil.Clone(in)
+	commonpbutil.UpdateMsgBase(
+		in.GetBase(),
+		commonpbutil.FillMsgBaseFromClient(paramtable.GetNodeID(), commonpbutil.WithTargetID(c.sess.ServerID)),
+	)
+	ret, err := c.grpcClient.ReCall(ctx, func(client rootcoordpb.RootCoordClient) (any, error) {
+		if !funcutil.CheckCtxValid(ctx) {
+			return nil, ctx.Err()
+		}
+		return client.DescribeCollectionInternal(ctx, in)
+	})
+	if err != nil || ret == nil {
+		return nil, err
+	}
+	return ret.(*milvuspb.DescribeCollectionResponse), err
+}
+
 // ShowCollections list all collection names
 func (c *Client) ShowCollections(ctx context.Context, in *milvuspb.ShowCollectionsRequest) (*milvuspb.ShowCollectionsResponse, error) {
 	in = typeutil.Clone(in)
@@ -352,6 +371,25 @@ func (c *Client) ShowPartitions(ctx context.Context, in *milvuspb.ShowPartitions
 	return ret.(*milvuspb.ShowPartitionsResponse), err
 }
 
+// ShowPartitionsInternal list all partitions in collection
+func (c *Client) ShowPartitionsInternal(ctx context.Context, in *milvuspb.ShowPartitionsRequest) (*milvuspb.ShowPartitionsResponse, error) {
+	in = typeutil.Clone(in)
+	commonpbutil.UpdateMsgBase(
+		in.GetBase(),
+		commonpbutil.FillMsgBaseFromClient(paramtable.GetNodeID(), commonpbutil.WithTargetID(c.sess.ServerID)),
+	)
+	ret, err := c.grpcClient.ReCall(ctx, func(client rootcoordpb.RootCoordClient) (any, error) {
+		if !funcutil.CheckCtxValid(ctx) {
+			return nil, ctx.Err()
+		}
+		return client.ShowPartitionsInternal(ctx, in)
+	})
+	if err != nil || ret == nil {
+		return nil, err
+	}
+	return ret.(*milvuspb.ShowPartitionsResponse), err
+}
+
 // AllocTimestamp global timestamp allocator
 func (c *Client) AllocTimestamp(ctx context.Context, in *rootcoordpb.AllocTimestampRequest) (*rootcoordpb.AllocTimestampResponse, error) {
 	in = typeutil.Clone(in)

internal/distributed/rootcoord/service.go

@@ -351,6 +351,11 @@ func (s *Server) DescribeCollection(ctx context.Context, in *milvuspb.DescribeCo
 	return s.rootCoord.DescribeCollection(ctx, in)
 }
 
+// DescribeCollectionInternal gets meta info of a collection
+func (s *Server) DescribeCollectionInternal(ctx context.Context, in *milvuspb.DescribeCollectionRequest) (*milvuspb.DescribeCollectionResponse, error) {
+	return s.rootCoord.DescribeCollectionInternal(ctx, in)
+}
+
 // ShowCollections gets all collections
 func (s *Server) ShowCollections(ctx context.Context, in *milvuspb.ShowCollectionsRequest) (*milvuspb.ShowCollectionsResponse, error) {
 	return s.rootCoord.ShowCollections(ctx, in)
@@ -376,6 +381,11 @@ func (s *Server) ShowPartitions(ctx context.Context, in *milvuspb.ShowPartitions
 	return s.rootCoord.ShowPartitions(ctx, in)
 }
 
+// ShowPartitionsInternal gets all partitions for the specified collection.
+func (s *Server) ShowPartitionsInternal(ctx context.Context, in *milvuspb.ShowPartitionsRequest) (*milvuspb.ShowPartitionsResponse, error) {
+	return s.rootCoord.ShowPartitionsInternal(ctx, in)
+}
+
 // AllocTimestamp global timestamp allocator
 func (s *Server) AllocTimestamp(ctx context.Context, in *rootcoordpb.AllocTimestampRequest) (*rootcoordpb.AllocTimestampResponse, error) {
 	return s.rootCoord.AllocTimestamp(ctx, in)

internal/mocks/mock_rootcoord.go

@@ -595,6 +595,53 @@ func (_c *RootCoord_DescribeCollection_Call) Return(_a0 *milvuspb.DescribeCollec
 	return _c
 }
 
+// DescribeCollectionInternal provides a mock function with given fields: ctx, req
+func (_m *RootCoord) DescribeCollectionInternal(ctx context.Context, req *milvuspb.DescribeCollectionRequest) (*milvuspb.DescribeCollectionResponse, error) {
+	ret := _m.Called(ctx, req)
+
+	var r0 *milvuspb.DescribeCollectionResponse
+	if rf, ok := ret.Get(0).(func(context.Context, *milvuspb.DescribeCollectionRequest) *milvuspb.DescribeCollectionResponse); ok {
+		r0 = rf(ctx, req)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*milvuspb.DescribeCollectionResponse)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(context.Context, *milvuspb.DescribeCollectionRequest) error); ok {
+		r1 = rf(ctx, req)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// RootCoord_DescribeCollectionInternal_Call is a *mock.Call that shadows Run/Return methods with type explicit version for method 'DescribeCollectionInternal'
+type RootCoord_DescribeCollectionInternal_Call struct {
+	*mock.Call
+}
+
+// DescribeCollectionInternal is a helper method to define mock.On call
+//  - ctx context.Context
+//  - req *milvuspb.DescribeCollectionRequest
+func (_e *RootCoord_Expecter) DescribeCollectionInternal(ctx interface{}, req interface{}) *RootCoord_DescribeCollectionInternal_Call {
+	return &RootCoord_DescribeCollectionInternal_Call{Call: _e.mock.On("DescribeCollectionInternal", ctx, req)}
+}
+
+func (_c *RootCoord_DescribeCollectionInternal_Call) Run(run func(ctx context.Context, req *milvuspb.DescribeCollectionRequest)) *RootCoord_DescribeCollectionInternal_Call {
+	_c.Call.Run(func(args mock.Arguments) {
+		run(args[0].(context.Context), args[1].(*milvuspb.DescribeCollectionRequest))
+	})
+	return _c
+}
+
+func (_c *RootCoord_DescribeCollectionInternal_Call) Return(_a0 *milvuspb.DescribeCollectionResponse, _a1 error) *RootCoord_DescribeCollectionInternal_Call {
+	_c.Call.Return(_a0, _a1)
+	return _c
+}
+
 // DropAlias provides a mock function with given fields: ctx, req
 func (_m *RootCoord) DropAlias(ctx context.Context, req *milvuspb.DropAliasRequest) (*commonpb.Status, error) {
 	ret := _m.Called(ctx, req)
@@ -1886,6 +1933,53 @@ func (_c *RootCoord_ShowPartitions_Call) Return(_a0 *milvuspb.ShowPartitionsResp
 	return _c
 }
 
+// ShowPartitionsInternal provides a mock function with given fields: ctx, req
+func (_m *RootCoord) ShowPartitionsInternal(ctx context.Context, req *milvuspb.ShowPartitionsRequest) (*milvuspb.ShowPartitionsResponse, error) {
+	ret := _m.Called(ctx, req)
+
+	var r0 *milvuspb.ShowPartitionsResponse
+	if rf, ok := ret.Get(0).(func(context.Context, *milvuspb.ShowPartitionsRequest) *milvuspb.ShowPartitionsResponse); ok {
+		r0 = rf(ctx, req)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*milvuspb.ShowPartitionsResponse)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(context.Context, *milvuspb.ShowPartitionsRequest) error); ok {
+		r1 = rf(ctx, req)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// RootCoord_ShowPartitionsInternal_Call is a *mock.Call that shadows Run/Return methods with type explicit version for method 'ShowPartitionsInternal'
+type RootCoord_ShowPartitionsInternal_Call struct {
+	*mock.Call
+}
+
+// ShowPartitionsInternal is a helper method to define mock.On call
+//  - ctx context.Context
+//  - req *milvuspb.ShowPartitionsRequest
+func (_e *RootCoord_Expecter) ShowPartitionsInternal(ctx interface{}, req interface{}) *RootCoord_ShowPartitionsInternal_Call {
+	return &RootCoord_ShowPartitionsInternal_Call{Call: _e.mock.On("ShowPartitionsInternal", ctx, req)}
+}
+
+func (_c *RootCoord_ShowPartitionsInternal_Call) Run(run func(ctx context.Context, req *milvuspb.ShowPartitionsRequest)) *RootCoord_ShowPartitionsInternal_Call {
+	_c.Call.Run(func(args mock.Arguments) {
+		run(args[0].(context.Context), args[1].(*milvuspb.ShowPartitionsRequest))
+	})
+	return _c
+}
+
+func (_c *RootCoord_ShowPartitionsInternal_Call) Return(_a0 *milvuspb.ShowPartitionsResponse, _a1 error) *RootCoord_ShowPartitionsInternal_Call {
+	_c.Call.Return(_a0, _a1)
+	return _c
+}
+
 // ShowSegments provides a mock function with given fields: ctx, req
 func (_m *RootCoord) ShowSegments(ctx context.Context, req *milvuspb.ShowSegmentsRequest) (*milvuspb.ShowSegmentsResponse, error) {
 	ret := _m.Called(ctx, req)

internal/proto/root_coord.proto

@@ -49,6 +49,7 @@ service RootCoord {
      * @return CollectionSchema
      */
     rpc DescribeCollection(milvus.DescribeCollectionRequest) returns (milvus.DescribeCollectionResponse) {}
+    rpc DescribeCollectionInternal(milvus.DescribeCollectionRequest) returns (milvus.DescribeCollectionResponse) {}
 
     rpc CreateAlias(milvus.CreateAliasRequest) returns (common.Status) {}
     rpc DropAlias(milvus.DropAliasRequest) returns (common.Status) {}
@@ -92,6 +93,7 @@ service RootCoord {
      * @return StringListResponse
      */
     rpc ShowPartitions(milvus.ShowPartitionsRequest) returns (milvus.ShowPartitionsResponse) {}
+    rpc ShowPartitionsInternal(milvus.ShowPartitionsRequest) returns (milvus.ShowPartitionsResponse) {}
 
 //    rpc DescribeSegment(milvus.DescribeSegmentRequest) returns (milvus.DescribeSegmentResponse) {}
     rpc ShowSegments(milvus.ShowSegmentsRequest) returns (milvus.ShowSegmentsResponse) {}

internal/proto/rootcoordpb/root_coord.pb.go

@@ -674,103 +674,105 @@ func init() {
 func init() { proto.RegisterFile("root_coord.proto", fileDescriptor_4513485a144f6b06) }
 
 var fileDescriptor_4513485a144f6b06 = []byte{
-	// 1535 bytes of a gzipped FileDescriptorProto
+	// 1557 bytes of a gzipped FileDescriptorProto
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+	0xbe, 0xf7, 0x3f, 0xb5, 0x3f, 0xa5, 0xbf, 0xa1, 0xef, 0x1d, 0x59, 0xb6, 0xb0, 0x8d, 0xcd, 0x7a,
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+	0x93, 0xb4, 0x6f, 0x48, 0xfa, 0xfc, 0x7d, 0x47, 0xe7, 0x22, 0x1d, 0x01, 0x1b, 0x8c, 0x52, 0xd1,
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+	0x37, 0x29, 0x65, 0x56, 0x6b, 0xc2, 0xa8, 0xa0, 0xe8, 0xf2, 0xd8, 0x76, 0x0e, 0xa7, 0x5c, 0x8d,
-	0x51, 0x5b, 0x2e, 0x7b, 0xab, 0xf5, 0xb2, 0x49, 0x27, 0x13, 0xea, 0xaa, 0xf9, 0x7a, 0x39, 0x8c,
+	0x5a, 0x72, 0xd9, 0x5b, 0xad, 0x95, 0x4c, 0x3a, 0x1e, 0x53, 0x57, 0xcd, 0xd7, 0x4a, 0x61, 0x54,
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+	0xd7, 0x74, 0x41, 0xff, 0x87, 0xa2, 0x04, 0x4a, 0x72, 0x2d, 0xe8, 0x65, 0x52, 0x1c, 0x18, 0x86,
-	0x9d, 0x15, 0xae, 0x25, 0x7f, 0x86, 0x35, 0xff, 0xe1, 0x15, 0x4f, 0xc0, 0xd8, 0xc7, 0xfa, 0xcd,
+	0x04, 0x42, 0xb7, 0x33, 0x20, 0x43, 0x77, 0x57, 0x39, 0xfa, 0xb0, 0x45, 0xf7, 0xd3, 0xda, 0x9a,
-	0x57, 0xbf, 0x7b, 0x26, 0x4e, 0xb3, 0x63, 0xb8, 0xf2, 0x76, 0x6a, 0xc9, 0xe2, 0xaf, 0x5a, 0x4c,
+	0xc4, 0x27, 0x76, 0xad, 0x95, 0x15, 0xae, 0x25, 0x7f, 0x82, 0x15, 0xff, 0xb9, 0x19, 0xaf, 0xfa,
-	0xd0, 0xe4, 0xe2, 0xc7, 0x4c, 0xf7, 0xa5, 0x18, 0x6e, 0x8f, 0x8f, 0xce, 0x3a, 0x66, 0x0c, 0xfe,
+	0xd8, 0xc7, 0xfa, 0xa5, 0x5b, 0xbb, 0x75, 0x2a, 0x4e, 0xb3, 0x63, 0xb8, 0xf4, 0x6a, 0x62, 0xc9,
-	0xdb, 0x73, 0x8f, 0xb0, 0x63, 0x5b, 0x91, 0x1e, 0xb3, 0x47, 0x04, 0xee, 0x60, 0x73, 0x4c, 0xe2,
+	0x2b, 0x4f, 0x5d, 0xac, 0xc1, 0xd5, 0x1e, 0xcf, 0x6d, 0x7d, 0x1b, 0xc7, 0x70, 0xbb, 0x7c, 0x78,
-	0x2d, 0x50, 0xbd, 0xe2, 0xa3, 0x9f, 0x68, 0x70, 0xc6, 0xa3, 0xfd, 0x2b, 0x20, 0x55, 0x10, 0xdc,
+	0x5a, 0x6e, 0x33, 0xf8, 0xb8, 0xeb, 0x1e, 0x62, 0xc7, 0xb6, 0x22, 0x37, 0xeb, 0x2e, 0x11, 0xb8,
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-	0x2f, 0xbb, 0x2d, 0xe8, 0xd7, 0x75, 0x28, 0x5d, 0x77, 0x89, 0x08, 0xbd, 0x69, 0x53, 0xd2, 0x35,
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-	0x0a, 0x5a, 0x9e, 0xae, 0x71, 0xac, 0x16, 0x73, 0xa1, 0xfa, 0xad, 0xcd, 0xfd, 0xc5, 0x37, 0x98,
+	0x48, 0xfc, 0x28, 0xf8, 0xbf, 0x60, 0x51, 0x8f, 0xa4, 0xff, 0x53, 0x08, 0x9d, 0x11, 0x3b, 0x44,
-	0x1f, 0xa6, 0xf5, 0x80, 0x18, 0x6a, 0x79, 0x0f, 0x58, 0x00, 0x87, 0x3c, 0x56, 0x36, 0x88, 0x5c,
+	0x84, 0x5e, 0xf2, 0x29, 0xe5, 0x1a, 0x05, 0x2d, 0x2e, 0xd7, 0x38, 0x56, 0x8b, 0xb9, 0x50, 0xf9,
-	0xf0, 0xfd, 0x96, 0x7a, 0x2d, 0x0f, 0xff, 0xe9, 0x70, 0xd6, 0x21, 0x7b, 0xa7, 0xef, 0x57, 0xfa,
+	0xc6, 0xe6, 0xfe, 0xe2, 0x4b, 0xcc, 0x0f, 0xd2, 0x2e, 0x9e, 0x18, 0x6a, 0xf1, 0xc5, 0x33, 0x07,
-	0x1a, 0x1d, 0xef, 0xbb, 0xf3, 0xb4, 0xd1, 0x10, 0x79, 0xe3, 0xcf, 0xc0, 0xec, 0x67, 0xe5, 0xe7,
+	0x0e, 0x79, 0xac, 0x64, 0x10, 0xb9, 0xe0, 0xfb, 0x2d, 0xf5, 0x31, 0x12, 0xfe, 0xab, 0xe5, 0xb4,
-	0x66, 0x1e, 0xc0, 0x66, 0x97, 0x38, 0x24, 0xc2, 0xfc, 0x30, 0xe5, 0x0a, 0x13, 0x85, 0x65, 0xcc,
+	0x24, 0x7b, 0xad, 0xbb, 0x4a, 0xfd, 0x78, 0x88, 0x5f, 0xf6, 0xb3, 0xb2, 0xd1, 0x10, 0xf9, 0xce,
-	0xbc, 0x31, 0x6c, 0xc8, 0x30, 0xc8, 0xef, 0xde, 0x72, 0xc2, 0x78, 0x4a, 0xbf, 0x8a, 0x60, 0x02,
+	0xc9, 0xc0, 0xec, 0x57, 0xe5, 0x87, 0x66, 0xee, 0xc3, 0x46, 0x87, 0x38, 0x24, 0xc2, 0x7c, 0x2f,
-	0xea, 0xfb, 0x59, 0xa0, 0xa1, 0x33, 0xb4, 0x11, 0x79, 0xc2, 0xc4, 0xf7, 0x31, 0x0f, 0x6a, 0xd2,
+	0xa5, 0x6f, 0x8a, 0xc2, 0x32, 0x56, 0xde, 0x08, 0xd6, 0x65, 0x18, 0xe4, 0x77, 0xaf, 0x38, 0x61,
-	0x83, 0xaa, 0xfe, 0x28, 0x23, 0x3a, 0x74, 0x86, 0x40, 0x85, 0xdb, 0xa0, 0x0e, 0x49, 0x49, 0xeb,
+	0x3c, 0xe5, 0x92, 0x8c, 0x60, 0x02, 0xea, 0x3b, 0x59, 0xa0, 0xa1, 0x1c, 0x5a, 0x8f, 0x3c, 0xdc,
-	0x39, 0x20, 0xa3, 0xbb, 0x5e, 0xc3, 0xba, 0x6c, 0xdd, 0x1e, 0xe5, 0x9d, 0xd4, 0xce, 0x7e, 0x0e,
+	0xe2, 0xfb, 0x98, 0x05, 0x35, 0xe9, 0x19, 0x59, 0xbb, 0x9f, 0x11, 0x1d, 0xca, 0x21, 0x50, 0xe1,
-	0xc2, 0x03, 0xa8, 0xbe, 0x9e, 0x12, 0x86, 0x05, 0x91, 0xfe, 0xf2, 0x78, 0x93, 0x33, 0x2b, 0x86,
+	0x36, 0xa8, 0x43, 0x52, 0xca, 0x7a, 0x06, 0xc8, 0xe8, 0xae, 0x17, 0xb0, 0x2a, 0xfb, 0x05, 0x8f,
-	0xca, 0x7c, 0x2b, 0x87, 0x3e, 0x91, 0x15, 0x7c, 0x89, 0x13, 0xe6, 0x80, 0xe5, 0xb5, 0x2d, 0x8c,
+	0xf2, 0x66, 0x6a, 0x3b, 0x71, 0x06, 0xc2, 0x7d, 0xa8, 0xbc, 0x98, 0x10, 0x86, 0x05, 0x91, 0xfe,
-	0x0b, 0x17, 0x4f, 0x35, 0x2f, 0x0d, 0x5b, 0x2a, 0xe0, 0x59, 0x9e, 0x41, 0x40, 0xe1, 0xc2, 0xaf,
+	0xf2, 0x78, 0x93, 0x2b, 0x2b, 0x86, 0xca, 0xfc, 0x16, 0x81, 0x1e, 0x91, 0x27, 0xf8, 0x02, 0x27,
-	0x22, 0x7f, 0xeb, 0xfb, 0xcc, 0x3e, 0xb2, 0x1d, 0x32, 0x22, 0x29, 0x19, 0x10, 0x87, 0x65, 0x74,
+	0xcc, 0x00, 0x8b, 0xcf, 0xb6, 0x30, 0x2e, 0x7c, 0x78, 0xaa, 0x79, 0x69, 0xd8, 0x42, 0x01, 0xcf,
-	0xd1, 0x10, 0x4a, 0x4a, 0x78, 0x97, 0x61, 0x57, 0xa0, 0x65, 0xa6, 0x79, 0x88, 0x80, 0xb6, 0x75,
+	0xf2, 0x0c, 0x02, 0x0a, 0x17, 0x7e, 0x0b, 0xfa, 0x5b, 0xdf, 0x63, 0xf6, 0xa1, 0xed, 0x90, 0x21,
-	0x36, 0x50, 0x6f, 0xc2, 0x04, 0x90, 0x69, 0xb1, 0x4f, 0x1d, 0xdb, 0x3c, 0x8d, 0x5f, 0x76, 0x74,
+	0x49, 0xa9, 0x80, 0x38, 0x2c, 0xa3, 0x8b, 0x06, 0x50, 0x54, 0xc2, 0x3b, 0x0c, 0xbb, 0x02, 0x2d,
-	0x69, 0x98, 0x43, 0x52, 0x2e, 0x3b, 0x89, 0x48, 0x2d, 0x32, 0x84, 0x52, 0x67, 0x4c, 0xcc, 0xc3,
+	0x32, 0xcd, 0x43, 0x04, 0xb4, 0xcd, 0xd3, 0x81, 0x7a, 0x13, 0x26, 0x80, 0x2c, 0x8b, 0x3d, 0xea,
-	0x57, 0x04, 0x3b, 0x62, 0x9c, 0xf6, 0x4e, 0x99, 0x23, 0x96, 0x6f, 0x24, 0x02, 0x0c, 0x34, 0x76,
+	0xd8, 0xe6, 0x49, 0xbc, 0xd9, 0xd1, 0x47, 0xc3, 0x0c, 0x92, 0xd2, 0xec, 0x24, 0x22, 0xb5, 0xc8,
-	0x9e, 0xfd, 0xf8, 0x74, 0x64, 0x8b, 0xf1, 0x6c, 0x28, 0xdd, 0xb8, 0xa5, 0xa0, 0x8f, 0x6c, 0xea,
+	0x00, 0x8a, 0xed, 0x11, 0x31, 0x0f, 0x9e, 0x13, 0xec, 0x88, 0x51, 0xda, 0xe3, 0x68, 0x86, 0x58,
-	0xff, 0xda, 0x0a, 0x0c, 0xdc, 0xf2, 0xa8, 0xb6, 0x74, 0x92, 0x4e, 0x87, 0xc3, 0x55, 0x6f, 0xea,
+	0xbc, 0x91, 0x08, 0x30, 0xd0, 0xd8, 0x7e, 0xfc, 0xc3, 0xa3, 0xa1, 0x2d, 0x46, 0xd3, 0x81, 0x74,
-	0xc9, 0xbf, 0x01, 0x00, 0x00, 0xff, 0xff, 0x94, 0x82, 0xd4, 0x6e, 0x4c, 0x18, 0x00, 0x00,
+	0xe3, 0xa6, 0x82, 0xde, 0xb7, 0xa9, 0xff, 0x6b, 0x33, 0x30, 0x70, 0xd3, 0xa3, 0xda, 0xd4, 0x45,
+	0x3a, 0x19, 0x0c, 0x96, 0xbd, 0xa9, 0x87, 0xff, 0x06, 0x00, 0x00, 0xff, 0xff, 0x68, 0x68, 0x82,
+	0xf8, 0x42, 0x19, 0x00, 0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -816,6 +818,7 @@ type RootCoordClient interface {
 	//
 	// @return CollectionSchema
 	DescribeCollection(ctx context.Context, in *milvuspb.DescribeCollectionRequest, opts ...grpc.CallOption) (*milvuspb.DescribeCollectionResponse, error)
+	DescribeCollectionInternal(ctx context.Context, in *milvuspb.DescribeCollectionRequest, opts ...grpc.CallOption) (*milvuspb.DescribeCollectionResponse, error)
 	CreateAlias(ctx context.Context, in *milvuspb.CreateAliasRequest, opts ...grpc.CallOption) (*commonpb.Status, error)
 	DropAlias(ctx context.Context, in *milvuspb.DropAliasRequest, opts ...grpc.CallOption) (*commonpb.Status, error)
 	AlterAlias(ctx context.Context, in *milvuspb.AlterAliasRequest, opts ...grpc.CallOption) (*commonpb.Status, error)
@@ -847,6 +850,7 @@ type RootCoordClient interface {
 	//
 	// @return StringListResponse
 	ShowPartitions(ctx context.Context, in *milvuspb.ShowPartitionsRequest, opts ...grpc.CallOption) (*milvuspb.ShowPartitionsResponse, error)
+	ShowPartitionsInternal(ctx context.Context, in *milvuspb.ShowPartitionsRequest, opts ...grpc.CallOption) (*milvuspb.ShowPartitionsResponse, error)
 	//    rpc DescribeSegment(milvus.DescribeSegmentRequest) returns (milvus.DescribeSegmentResponse) {}
 	ShowSegments(ctx context.Context, in *milvuspb.ShowSegmentsRequest, opts ...grpc.CallOption) (*milvuspb.ShowSegmentsResponse, error)
 	AllocTimestamp(ctx context.Context, in *AllocTimestampRequest, opts ...grpc.CallOption) (*AllocTimestampResponse, error)
@@ -951,6 +955,15 @@ func (c *rootCoordClient) DescribeCollection(ctx context.Context, in *milvuspb.D
 	return out, nil
 }
 
+func (c *rootCoordClient) DescribeCollectionInternal(ctx context.Context, in *milvuspb.DescribeCollectionRequest, opts ...grpc.CallOption) (*milvuspb.DescribeCollectionResponse, error) {
+	out := new(milvuspb.DescribeCollectionResponse)
+	err := c.cc.Invoke(ctx, "/milvus.proto.rootcoord.RootCoord/DescribeCollectionInternal", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 func (c *rootCoordClient) CreateAlias(ctx context.Context, in *milvuspb.CreateAliasRequest, opts ...grpc.CallOption) (*commonpb.Status, error) {
 	out := new(commonpb.Status)
 	err := c.cc.Invoke(ctx, "/milvus.proto.rootcoord.RootCoord/CreateAlias", in, out, opts...)
@@ -1032,6 +1045,15 @@ func (c *rootCoordClient) ShowPartitions(ctx context.Context, in *milvuspb.ShowP
 	return out, nil
 }
 
+func (c *rootCoordClient) ShowPartitionsInternal(ctx context.Context, in *milvuspb.ShowPartitionsRequest, opts ...grpc.CallOption) (*milvuspb.ShowPartitionsResponse, error) {
+	out := new(milvuspb.ShowPartitionsResponse)
+	err := c.cc.Invoke(ctx, "/milvus.proto.rootcoord.RootCoord/ShowPartitionsInternal", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 func (c *rootCoordClient) ShowSegments(ctx context.Context, in *milvuspb.ShowSegmentsRequest, opts ...grpc.CallOption) (*milvuspb.ShowSegmentsResponse, error) {
 	out := new(milvuspb.ShowSegmentsResponse)
 	err := c.cc.Invoke(ctx, "/milvus.proto.rootcoord.RootCoord/ShowSegments", in, out, opts...)
@@ -1290,6 +1312,7 @@ type RootCoordServer interface {
 	//
 	// @return CollectionSchema
 	DescribeCollection(context.Context, *milvuspb.DescribeCollectionRequest) (*milvuspb.DescribeCollectionResponse, error)
+	DescribeCollectionInternal(context.Context, *milvuspb.DescribeCollectionRequest) (*milvuspb.DescribeCollectionResponse, error)
 	CreateAlias(context.Context, *milvuspb.CreateAliasRequest) (*commonpb.Status, error)
 	DropAlias(context.Context, *milvuspb.DropAliasRequest) (*commonpb.Status, error)
 	AlterAlias(context.Context, *milvuspb.AlterAliasRequest) (*commonpb.Status, error)
@@ -1321,6 +1344,7 @@ type RootCoordServer interface {
 	//
 	// @return StringListResponse
 	ShowPartitions(context.Context, *milvuspb.ShowPartitionsRequest) (*milvuspb.ShowPartitionsResponse, error)
+	ShowPartitionsInternal(context.Context, *milvuspb.ShowPartitionsRequest) (*milvuspb.ShowPartitionsResponse, error)
 	//    rpc DescribeSegment(milvus.DescribeSegmentRequest) returns (milvus.DescribeSegmentResponse) {}
 	ShowSegments(context.Context, *milvuspb.ShowSegmentsRequest) (*milvuspb.ShowSegmentsResponse, error)
 	AllocTimestamp(context.Context, *AllocTimestampRequest) (*AllocTimestampResponse, error)
@@ -1379,6 +1403,9 @@ func (*UnimplementedRootCoordServer) HasCollection(ctx context.Context, req *mil
 func (*UnimplementedRootCoordServer) DescribeCollection(ctx context.Context, req *milvuspb.DescribeCollectionRequest) (*milvuspb.DescribeCollectionResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method DescribeCollection not implemented")
 }
+func (*UnimplementedRootCoordServer) DescribeCollectionInternal(ctx context.Context, req *milvuspb.DescribeCollectionRequest) (*milvuspb.DescribeCollectionResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method DescribeCollectionInternal not implemented")
+}
 func (*UnimplementedRootCoordServer) CreateAlias(ctx context.Context, req *milvuspb.CreateAliasRequest) (*commonpb.Status, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method CreateAlias not implemented")
 }
@@ -1406,6 +1433,9 @@ func (*UnimplementedRootCoordServer) HasPartition(ctx context.Context, req *milv
 func (*UnimplementedRootCoordServer) ShowPartitions(ctx context.Context, req *milvuspb.ShowPartitionsRequest) (*milvuspb.ShowPartitionsResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method ShowPartitions not implemented")
 }
+func (*UnimplementedRootCoordServer) ShowPartitionsInternal(ctx context.Context, req *milvuspb.ShowPartitionsRequest) (*milvuspb.ShowPartitionsResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method ShowPartitionsInternal not implemented")
+}
 func (*UnimplementedRootCoordServer) ShowSegments(ctx context.Context, req *milvuspb.ShowSegmentsRequest) (*milvuspb.ShowSegmentsResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method ShowSegments not implemented")
 }
@@ -1612,6 +1642,24 @@ func _RootCoord_DescribeCollection_Handler(srv interface{}, ctx context.Context,
 	return interceptor(ctx, in, info, handler)
 }
 
+func _RootCoord_DescribeCollectionInternal_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(milvuspb.DescribeCollectionRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(RootCoordServer).DescribeCollectionInternal(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/milvus.proto.rootcoord.RootCoord/DescribeCollectionInternal",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(RootCoordServer).DescribeCollectionInternal(ctx, req.(*milvuspb.DescribeCollectionRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 func _RootCoord_CreateAlias_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
 	in := new(milvuspb.CreateAliasRequest)
 	if err := dec(in); err != nil {
@@ -1774,6 +1822,24 @@ func _RootCoord_ShowPartitions_Handler(srv interface{}, ctx context.Context, dec
 	return interceptor(ctx, in, info, handler)
 }
 
+func _RootCoord_ShowPartitionsInternal_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(milvuspb.ShowPartitionsRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(RootCoordServer).ShowPartitionsInternal(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/milvus.proto.rootcoord.RootCoord/ShowPartitionsInternal",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(RootCoordServer).ShowPartitionsInternal(ctx, req.(*milvuspb.ShowPartitionsRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 func _RootCoord_ShowSegments_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
 	in := new(milvuspb.ShowSegmentsRequest)
 	if err := dec(in); err != nil {
@@ -2256,6 +2322,10 @@ var _RootCoord_serviceDesc = grpc.ServiceDesc{
 			MethodName: "DescribeCollection",
 			Handler:    _RootCoord_DescribeCollection_Handler,
 		},
+		{
+			MethodName: "DescribeCollectionInternal",
+			Handler:    _RootCoord_DescribeCollectionInternal_Handler,
+		},
 		{
 			MethodName: "CreateAlias",
 			Handler:    _RootCoord_CreateAlias_Handler,
@@ -2292,6 +2362,10 @@ var _RootCoord_serviceDesc = grpc.ServiceDesc{
 			MethodName: "ShowPartitions",
 			Handler:    _RootCoord_ShowPartitions_Handler,
 		},
+		{
+			MethodName: "ShowPartitionsInternal",
+			Handler:    _RootCoord_ShowPartitionsInternal_Handler,
+		},
 		{
 			MethodName: "ShowSegments",
 			Handler:    _RootCoord_ShowSegments_Handler,

internal/proxy/rootcoord_mock_test.go

@@ -495,6 +495,10 @@ func (coord *RootCoordMock) DescribeCollection(ctx context.Context, req *milvusp
 	}, nil
 }
 
+func (coord *RootCoordMock) DescribeCollectionInternal(ctx context.Context, req *milvuspb.DescribeCollectionRequest) (*milvuspb.DescribeCollectionResponse, error) {
+	return coord.DescribeCollection(ctx, req)
+}
+
 func (coord *RootCoordMock) ShowCollections(ctx context.Context, req *milvuspb.ShowCollectionsRequest) (*milvuspb.ShowCollectionsResponse, error) {
 	code := coord.state.Load().(commonpb.StateCode)
 	if code != commonpb.StateCode_Healthy {
@@ -720,6 +724,10 @@ func (coord *RootCoordMock) ShowPartitions(ctx context.Context, req *milvuspb.Sh
 	}, nil
 }
 
+func (coord *RootCoordMock) ShowPartitionsInternal(ctx context.Context, req *milvuspb.ShowPartitionsRequest) (*milvuspb.ShowPartitionsResponse, error) {
+	return coord.ShowPartitions(ctx, req)
+}
+
 //func (coord *RootCoordMock) CreateIndex(ctx context.Context, req *milvuspb.CreateIndexRequest) (*commonpb.Status, error) {
 //	code := coord.state.Load().(commonpb.StateCode)
 //	if code != commonpb.StateCode_Healthy {
@@ -1167,6 +1175,10 @@ func (m *mockRootCoord) DescribeCollection(ctx context.Context, request *milvusp
 	return nil, errors.New("mock")
 }
 
+func (m *mockRootCoord) DescribeCollectionInternal(ctx context.Context, request *milvuspb.DescribeCollectionRequest) (*milvuspb.DescribeCollectionResponse, error) {
+	return m.DescribeCollection(ctx, request)
+}
+
 func (m *mockRootCoord) ShowPartitions(ctx context.Context, request *milvuspb.ShowPartitionsRequest) (*milvuspb.ShowPartitionsResponse, error) {
 	if m.ShowPartitionsFunc != nil {
 		return m.ShowPartitionsFunc(ctx, request)
@@ -1174,6 +1186,10 @@ func (m *mockRootCoord) ShowPartitions(ctx context.Context, request *milvuspb.Sh
 	return nil, errors.New("mock")
 }
 
+func (m *mockRootCoord) ShowPartitionsInternal(ctx context.Context, request *milvuspb.ShowPartitionsRequest) (*milvuspb.ShowPartitionsResponse, error) {
+	return m.ShowPartitions(ctx, request)
+}
+
 func (m *mockRootCoord) ShowSegments(ctx context.Context, request *milvuspb.ShowSegmentsRequest) (*milvuspb.ShowSegmentsResponse, error) {
 	if m.ShowSegmentsFunc != nil {
 		return m.ShowSegmentsFunc(ctx, request)

internal/querycoordv2/meta/coordinator_broker.go

@@ -76,7 +76,7 @@ func (broker *CoordinatorBroker) GetCollectionSchema(ctx context.Context, collec
 		),
 		CollectionID: collectionID,
 	}
-	resp, err := broker.rootCoord.DescribeCollection(ctx, req)
+	resp, err := broker.rootCoord.DescribeCollectionInternal(ctx, req)
 	if err != nil {
 		return nil, err
 	}
@@ -97,7 +97,7 @@ func (broker *CoordinatorBroker) GetPartitions(ctx context.Context, collectionID
 		),
 		CollectionID: collectionID,
 	}
-	resp, err := broker.rootCoord.ShowPartitions(ctx, req)
+	resp, err := broker.rootCoord.ShowPartitionsInternal(ctx, req)
 	if err != nil {
 		log.Warn("showPartition failed", zap.Int64("collectionID", collectionID), zap.Error(err))
 		return nil, err

internal/querycoordv2/meta/coordinator_broker_test.go

@@ -34,12 +34,12 @@ import (
 )
 
 func TestCoordinatorBroker_GetCollectionSchema(t *testing.T) {
-	t.Run("got error on DescribeCollection", func(t *testing.T) {
+	t.Run("got error on DescribeCollectionInternal", func(t *testing.T) {
 		rootCoord := mocks.NewRootCoord(t)
-		rootCoord.On("DescribeCollection",
+		rootCoord.On("DescribeCollectionInternal",
 			mock.Anything,
 			mock.Anything,
-		).Return(nil, errors.New("error mock DescribeCollection"))
+		).Return(nil, errors.New("error mock DescribeCollectionInternal"))
 		ctx := context.Background()
 		broker := &CoordinatorBroker{rootCoord: rootCoord}
 		_, err := broker.GetCollectionSchema(ctx, 100)
@@ -48,7 +48,7 @@ func TestCoordinatorBroker_GetCollectionSchema(t *testing.T) {
 
 	t.Run("non-success code", func(t *testing.T) {
 		rootCoord := mocks.NewRootCoord(t)
-		rootCoord.On("DescribeCollection",
+		rootCoord.On("DescribeCollectionInternal",
 			mock.Anything,
 			mock.Anything,
 		).Return(&milvuspb.DescribeCollectionResponse{
@@ -62,7 +62,7 @@ func TestCoordinatorBroker_GetCollectionSchema(t *testing.T) {
 
 	t.Run("normal case", func(t *testing.T) {
 		rootCoord := mocks.NewRootCoord(t)
-		rootCoord.On("DescribeCollection",
+		rootCoord.On("DescribeCollectionInternal",
 			mock.Anything,
 			mock.Anything,
 		).Return(&milvuspb.DescribeCollectionResponse{

internal/rootcoord/broker.go

@@ -243,7 +243,7 @@ func (b *ServerBroker) GetSegmentIndexState(ctx context.Context, collID UniqueID
 func (b *ServerBroker) BroadcastAlteredCollection(ctx context.Context, req *milvuspb.AlterCollectionRequest) error {
 	log.Info("broadcasting request to alter collection", zap.String("collection name", req.GetCollectionName()), zap.Int64("collection id", req.GetCollectionID()))
 
-	colMeta, err := b.s.meta.GetCollectionByID(ctx, req.GetCollectionID(), typeutil.MaxTimestamp)
+	colMeta, err := b.s.meta.GetCollectionByID(ctx, req.GetCollectionID(), typeutil.MaxTimestamp, false)
 	if err != nil {
 		return err
 	}

internal/rootcoord/broker_test.go

@@ -303,7 +303,7 @@ func TestServerBroker_BroadcastAlteredCollection(t *testing.T) {
 	t.Run("get meta fail", func(t *testing.T) {
 		c := newTestCore(withInvalidDataCoord())
 		c.meta = &mockMetaTable{
-			GetCollectionByIDFunc: func(ctx context.Context, collectionID UniqueID, ts Timestamp) (*model.Collection, error) {
+			GetCollectionByIDFunc: func(ctx context.Context, collectionID UniqueID, ts Timestamp, allowUnavailable bool) (*model.Collection, error) {
 				return nil, errors.New("err")
 			},
 		}
@@ -316,7 +316,7 @@ func TestServerBroker_BroadcastAlteredCollection(t *testing.T) {
 	t.Run("failed to execute", func(t *testing.T) {
 		c := newTestCore(withInvalidDataCoord())
 		c.meta = &mockMetaTable{
-			GetCollectionByIDFunc: func(ctx context.Context, collectionID UniqueID, ts Timestamp) (*model.Collection, error) {
+			GetCollectionByIDFunc: func(ctx context.Context, collectionID UniqueID, ts Timestamp, allowUnavailable bool) (*model.Collection, error) {
 				return collMeta, nil
 			},
 		}
@@ -329,7 +329,7 @@ func TestServerBroker_BroadcastAlteredCollection(t *testing.T) {
 	t.Run("non success error code on execute", func(t *testing.T) {
 		c := newTestCore(withFailedDataCoord())
 		c.meta = &mockMetaTable{
-			GetCollectionByIDFunc: func(ctx context.Context, collectionID UniqueID, ts Timestamp) (*model.Collection, error) {
+			GetCollectionByIDFunc: func(ctx context.Context, collectionID UniqueID, ts Timestamp, allowUnavailable bool) (*model.Collection, error) {
 				return collMeta, nil
 			},
 		}
@@ -342,7 +342,7 @@ func TestServerBroker_BroadcastAlteredCollection(t *testing.T) {
 	t.Run("success", func(t *testing.T) {
 		c := newTestCore(withValidDataCoord())
 		c.meta = &mockMetaTable{
-			GetCollectionByIDFunc: func(ctx context.Context, collectionID UniqueID, ts Timestamp) (*model.Collection, error) {
+			GetCollectionByIDFunc: func(ctx context.Context, collectionID UniqueID, ts Timestamp, allowUnavailable bool) (*model.Collection, error) {
 				return collMeta, nil
 			},
 		}

internal/rootcoord/describe_collection_task.go

@@ -10,8 +10,9 @@ import (
 // describeCollectionTask describe collection request task
 type describeCollectionTask struct {
 	baseTask
-	Req *milvuspb.DescribeCollectionRequest
+	Req              *milvuspb.DescribeCollectionRequest
-	Rsp *milvuspb.DescribeCollectionResponse
+	Rsp              *milvuspb.DescribeCollectionResponse
+	allowUnavailable bool
 }
 
 func (t *describeCollectionTask) Prepare(ctx context.Context) error {
@@ -23,7 +24,7 @@ func (t *describeCollectionTask) Prepare(ctx context.Context) error {
 
 // Execute task execution
 func (t *describeCollectionTask) Execute(ctx context.Context) (err error) {
-	coll, err := t.core.describeCollection(ctx, t.Req)
+	coll, err := t.core.describeCollection(ctx, t.Req, t.allowUnavailable)
 	if err != nil {
 		return err
 	}

internal/rootcoord/describe_collection_task_test.go

@@ -78,7 +78,7 @@ func Test_describeCollectionTask_Execute(t *testing.T) {
 
 	t.Run("success", func(t *testing.T) {
 		meta := newMockMetaTable()
-		meta.GetCollectionByIDFunc = func(ctx context.Context, collectionID UniqueID, ts Timestamp) (*model.Collection, error) {
+		meta.GetCollectionByIDFunc = func(ctx context.Context, collectionID UniqueID, ts Timestamp, allowUnavailable bool) (*model.Collection, error) {
 			return &model.Collection{
 				CollectionID: 1,
 				Name:         "test coll",

internal/rootcoord/import_helper.go

@@ -73,7 +73,7 @@ func NewImportFactory(c *Core) ImportFactory {
 
 func GetCollectionNameWithCore(c *Core) GetCollectionNameFunc {
 	return func(collID, partitionID UniqueID) (string, string, error) {
-		colInfo, err := c.meta.GetCollectionByID(c.ctx, collID, typeutil.MaxTimestamp)
+		colInfo, err := c.meta.GetCollectionByID(c.ctx, collID, typeutil.MaxTimestamp, false)
 		if err != nil {
 			log.Error("Core failed to get collection name by id", zap.Int64("ID", collID), zap.Error(err))
 			return "", "", err

internal/rootcoord/meta_table.go

@@ -72,7 +72,7 @@ type IMetaTable interface {
 	ChangeCollectionState(ctx context.Context, collectionID UniqueID, state pb.CollectionState, ts Timestamp) error
 	RemoveCollection(ctx context.Context, collectionID UniqueID, ts Timestamp) error
 	GetCollectionByName(ctx context.Context, collectionName string, ts Timestamp) (*model.Collection, error)
-	GetCollectionByID(ctx context.Context, collectionID UniqueID, ts Timestamp) (*model.Collection, error)
+	GetCollectionByID(ctx context.Context, collectionID UniqueID, ts Timestamp, allowUnavailable bool) (*model.Collection, error)
 	ListCollections(ctx context.Context, ts Timestamp) ([]*model.Collection, error)
 	ListAbnormalCollections(ctx context.Context, ts Timestamp) ([]*model.Collection, error)
 	ListCollectionPhysicalChannels() map[typeutil.UniqueID][]string
@@ -304,18 +304,24 @@ func filterUnavailable(coll *model.Collection) *model.Collection {
 }
 
 // getLatestCollectionByIDInternal should be called with ts = typeutil.MaxTimestamp
-func (mt *MetaTable) getLatestCollectionByIDInternal(ctx context.Context, collectionID UniqueID) (*model.Collection, error) {
+func (mt *MetaTable) getLatestCollectionByIDInternal(ctx context.Context, collectionID UniqueID, allowAvailable bool) (*model.Collection, error) {
 	coll, ok := mt.collID2Meta[collectionID]
-	if !ok || coll == nil || !coll.Available() {
+	if !ok || coll == nil {
+		return nil, common.NewCollectionNotExistError(fmt.Sprintf("can't find collection: %d", collectionID))
+	}
+	if allowAvailable {
+		return coll.Clone(), nil
+	}
+	if !coll.Available() {
 		return nil, common.NewCollectionNotExistError(fmt.Sprintf("can't find collection: %d", collectionID))
 	}
 	return filterUnavailable(coll), nil
 }
 
 // getCollectionByIDInternal get collection by collection id without lock.
-func (mt *MetaTable) getCollectionByIDInternal(ctx context.Context, collectionID UniqueID, ts Timestamp) (*model.Collection, error) {
+func (mt *MetaTable) getCollectionByIDInternal(ctx context.Context, collectionID UniqueID, ts Timestamp, allowUnavailable bool) (*model.Collection, error) {
 	if isMaxTs(ts) {
-		return mt.getLatestCollectionByIDInternal(ctx, collectionID)
+		return mt.getLatestCollectionByIDInternal(ctx, collectionID, allowUnavailable)
 	}
 
 	var coll *model.Collection
@@ -331,7 +337,16 @@ func (mt *MetaTable) getCollectionByIDInternal(ctx context.Context, collectionID
 		}
 	}
 
-	if coll == nil || !coll.Available() {
+	if coll == nil {
+		// use coll.Name to match error message of regression. TODO: remove this after error code is ready.
+		return nil, common.NewCollectionNotExistError(fmt.Sprintf("can't find collection: %s", coll.Name))
+	}
+
+	if allowUnavailable {
+		return coll.Clone(), nil
+	}
+
+	if !coll.Available() {
 		// use coll.Name to match error message of regression. TODO: remove this after error code is ready.
 		return nil, common.NewCollectionNotExistError(fmt.Sprintf("can't find collection: %s", coll.Name))
 	}
@@ -347,12 +362,12 @@ func (mt *MetaTable) GetCollectionByName(ctx context.Context, collectionName str
 
 	collectionID, ok := mt.collAlias2ID[collectionName]
 	if ok {
-		return mt.getCollectionByIDInternal(ctx, collectionID, ts)
+		return mt.getCollectionByIDInternal(ctx, collectionID, ts, false)
 	}
 
 	collectionID, ok = mt.collName2ID[collectionName]
 	if ok {
-		return mt.getCollectionByIDInternal(ctx, collectionID, ts)
+		return mt.getCollectionByIDInternal(ctx, collectionID, ts, false)
 	}
 
 	if isMaxTs(ts) {
@@ -371,11 +386,11 @@ func (mt *MetaTable) GetCollectionByName(ctx context.Context, collectionName str
 	return filterUnavailable(coll), nil
 }
 
-func (mt *MetaTable) GetCollectionByID(ctx context.Context, collectionID UniqueID, ts Timestamp) (*model.Collection, error) {
+func (mt *MetaTable) GetCollectionByID(ctx context.Context, collectionID UniqueID, ts Timestamp, allowUnavailable bool) (*model.Collection, error) {
 	mt.ddLock.RLock()
 	defer mt.ddLock.RUnlock()
 
-	return mt.getCollectionByIDInternal(ctx, collectionID, ts)
+	return mt.getCollectionByIDInternal(ctx, collectionID, ts, allowUnavailable)
 }
 
 func (mt *MetaTable) ListCollections(ctx context.Context, ts Timestamp) ([]*model.Collection, error) {

internal/rootcoord/meta_table_test.go

@@ -423,7 +423,7 @@ func TestMetaTable_getCollectionByIDInternal(t *testing.T) {
 			collID2Meta: map[typeutil.UniqueID]*model.Collection{},
 		}
 		ctx := context.Background()
-		_, err := meta.getCollectionByIDInternal(ctx, 100, 101)
+		_, err := meta.getCollectionByIDInternal(ctx, 100, 101, false)
 		assert.Error(t, err)
 	})
 
@@ -439,9 +439,12 @@ func TestMetaTable_getCollectionByIDInternal(t *testing.T) {
 			collID2Meta: map[typeutil.UniqueID]*model.Collection{},
 		}
 		ctx := context.Background()
-		_, err := meta.getCollectionByIDInternal(ctx, 100, 101)
+		_, err := meta.getCollectionByIDInternal(ctx, 100, 101, false)
 		assert.Error(t, err)
 		assert.True(t, common.IsCollectionNotExistError(err))
+		coll, err := meta.getCollectionByIDInternal(ctx, 100, 101, true)
+		assert.NoError(t, err)
+		assert.False(t, coll.Available())
 	})
 
 	t.Run("normal case, filter unavailable partitions", func(t *testing.T) {
@@ -459,7 +462,7 @@ func TestMetaTable_getCollectionByIDInternal(t *testing.T) {
 			},
 		}
 		ctx := context.Background()
-		coll, err := meta.getCollectionByIDInternal(ctx, 100, 101)
+		coll, err := meta.getCollectionByIDInternal(ctx, 100, 101, false)
 		assert.NoError(t, err)
 		assert.Equal(t, 1, len(coll.Partitions))
 		assert.Equal(t, UniqueID(11), coll.Partitions[0].PartitionID)
@@ -481,7 +484,7 @@ func TestMetaTable_getCollectionByIDInternal(t *testing.T) {
 			},
 		}
 		ctx := context.Background()
-		coll, err := meta.getCollectionByIDInternal(ctx, 100, typeutil.MaxTimestamp)
+		coll, err := meta.getCollectionByIDInternal(ctx, 100, typeutil.MaxTimestamp, false)
 		assert.NoError(t, err)
 		assert.Equal(t, 1, len(coll.Partitions))
 		assert.Equal(t, UniqueID(11), coll.Partitions[0].PartitionID)
@@ -664,7 +667,7 @@ func TestMetaTable_getLatestCollectionByIDInternal(t *testing.T) {
 	t.Run("not exist", func(t *testing.T) {
 		ctx := context.Background()
 		mt := &MetaTable{collID2Meta: nil}
-		_, err := mt.getLatestCollectionByIDInternal(ctx, 100)
+		_, err := mt.getLatestCollectionByIDInternal(ctx, 100, false)
 		assert.Error(t, err)
 		assert.True(t, common.IsCollectionNotExistError(err))
 	})
@@ -674,7 +677,7 @@ func TestMetaTable_getLatestCollectionByIDInternal(t *testing.T) {
 		mt := &MetaTable{collID2Meta: map[typeutil.UniqueID]*model.Collection{
 			100: nil,
 		}}
-		_, err := mt.getLatestCollectionByIDInternal(ctx, 100)
+		_, err := mt.getLatestCollectionByIDInternal(ctx, 100, false)
 		assert.Error(t, err)
 		assert.True(t, common.IsCollectionNotExistError(err))
 	})
@@ -684,9 +687,12 @@ func TestMetaTable_getLatestCollectionByIDInternal(t *testing.T) {
 		mt := &MetaTable{collID2Meta: map[typeutil.UniqueID]*model.Collection{
 			100: {State: pb.CollectionState_CollectionDropping},
 		}}
-		_, err := mt.getLatestCollectionByIDInternal(ctx, 100)
+		_, err := mt.getLatestCollectionByIDInternal(ctx, 100, false)
 		assert.Error(t, err)
 		assert.True(t, common.IsCollectionNotExistError(err))
+		coll, err := mt.getLatestCollectionByIDInternal(ctx, 100, true)
+		assert.NoError(t, err)
+		assert.False(t, coll.Available())
 	})
 
 	t.Run("normal case", func(t *testing.T) {
@@ -700,7 +706,7 @@ func TestMetaTable_getLatestCollectionByIDInternal(t *testing.T) {
 				},
 			},
 		}}
-		coll, err := mt.getLatestCollectionByIDInternal(ctx, 100)
+		coll, err := mt.getLatestCollectionByIDInternal(ctx, 100, false)
 		assert.NoError(t, err)
 		assert.Equal(t, 1, len(coll.Partitions))
 	})

internal/rootcoord/mock_test.go

@@ -38,7 +38,7 @@ type mockMetaTable struct {
 	ListCollectionsFunc              func(ctx context.Context, ts Timestamp) ([]*model.Collection, error)
 	AddCollectionFunc                func(ctx context.Context, coll *model.Collection) error
 	GetCollectionByNameFunc          func(ctx context.Context, collectionName string, ts Timestamp) (*model.Collection, error)
-	GetCollectionByIDFunc            func(ctx context.Context, collectionID UniqueID, ts Timestamp) (*model.Collection, error)
+	GetCollectionByIDFunc            func(ctx context.Context, collectionID UniqueID, ts Timestamp, allowUnavailable bool) (*model.Collection, error)
 	ChangeCollectionStateFunc        func(ctx context.Context, collectionID UniqueID, state pb.CollectionState, ts Timestamp) error
 	RemoveCollectionFunc             func(ctx context.Context, collectionID UniqueID, ts Timestamp) error
 	AddPartitionFunc                 func(ctx context.Context, partition *model.Partition) error
@@ -67,8 +67,8 @@ func (m mockMetaTable) GetCollectionByName(ctx context.Context, collectionName s
 	return m.GetCollectionByNameFunc(ctx, collectionName, ts)
 }
 
-func (m mockMetaTable) GetCollectionByID(ctx context.Context, collectionID UniqueID, ts Timestamp) (*model.Collection, error) {
+func (m mockMetaTable) GetCollectionByID(ctx context.Context, collectionID UniqueID, ts Timestamp, allowUnavailable bool) (*model.Collection, error) {
-	return m.GetCollectionByIDFunc(ctx, collectionID, ts)
+	return m.GetCollectionByIDFunc(ctx, collectionID, ts, allowUnavailable)
 }
 
 func (m mockMetaTable) ChangeCollectionState(ctx context.Context, collectionID UniqueID, state pb.CollectionState, ts Timestamp) error {
@@ -361,7 +361,7 @@ func withInvalidMeta() Opt {
 	meta.GetCollectionByNameFunc = func(ctx context.Context, collectionName string, ts Timestamp) (*model.Collection, error) {
 		return nil, errors.New("error mock GetCollectionByName")
 	}
-	meta.GetCollectionByIDFunc = func(ctx context.Context, collectionID typeutil.UniqueID, ts Timestamp) (*model.Collection, error) {
+	meta.GetCollectionByIDFunc = func(ctx context.Context, collectionID typeutil.UniqueID, ts Timestamp, allowUnavailable bool) (*model.Collection, error) {
 		return nil, errors.New("error mock GetCollectionByID")
 	}
 	meta.AddPartitionFunc = func(ctx context.Context, partition *model.Partition) error {

internal/rootcoord/mocks/IMetaTable.go

@@ -216,13 +216,13 @@ func (_m *IMetaTable) DropRole(tenant string, roleName string) error {
 	return r0
 }
 
-// GetCollectionByID provides a mock function with given fields: ctx, collectionID, ts
+// GetCollectionByID provides a mock function with given fields: ctx, collectionID, ts, allowUnavailable
-func (_m *IMetaTable) GetCollectionByID(ctx context.Context, collectionID int64, ts uint64) (*model.Collection, error) {
+func (_m *IMetaTable) GetCollectionByID(ctx context.Context, collectionID int64, ts uint64, allowUnavailable bool) (*model.Collection, error) {
-	ret := _m.Called(ctx, collectionID, ts)
+	ret := _m.Called(ctx, collectionID, ts, allowUnavailable)
 
 	var r0 *model.Collection
-	if rf, ok := ret.Get(0).(func(context.Context, int64, uint64) *model.Collection); ok {
+	if rf, ok := ret.Get(0).(func(context.Context, int64, uint64, bool) *model.Collection); ok {
-		r0 = rf(ctx, collectionID, ts)
+		r0 = rf(ctx, collectionID, ts, allowUnavailable)
 	} else {
 		if ret.Get(0) != nil {
 			r0 = ret.Get(0).(*model.Collection)
@@ -230,8 +230,8 @@ func (_m *IMetaTable) GetCollectionByID(ctx context.Context, collectionID int64,
 	}
 
 	var r1 error
-	if rf, ok := ret.Get(1).(func(context.Context, int64, uint64) error); ok {
+	if rf, ok := ret.Get(1).(func(context.Context, int64, uint64, bool) error); ok {
-		r1 = rf(ctx, collectionID, ts)
+		r1 = rf(ctx, collectionID, ts, allowUnavailable)
 	} else {
 		r1 = ret.Error(1)
 	}

internal/rootcoord/root_coord.go

@@ -916,12 +916,12 @@ func (c *Core) HasCollection(ctx context.Context, in *milvuspb.HasCollectionRequ
 	return t.Rsp, nil
 }
 
-func (c *Core) describeCollection(ctx context.Context, in *milvuspb.DescribeCollectionRequest) (*model.Collection, error) {
+func (c *Core) describeCollection(ctx context.Context, in *milvuspb.DescribeCollectionRequest, allowUnavailable bool) (*model.Collection, error) {
 	ts := getTravelTs(in)
 	if in.GetCollectionName() != "" {
 		return c.meta.GetCollectionByName(ctx, in.GetCollectionName(), ts)
 	}
-	return c.meta.GetCollectionByID(ctx, in.GetCollectionID(), ts)
+	return c.meta.GetCollectionByID(ctx, in.GetCollectionID(), ts, allowUnavailable)
 }
 
 func convertModelToDesc(collInfo *model.Collection, aliases []string) *milvuspb.DescribeCollectionResponse {
@@ -952,8 +952,7 @@ func convertModelToDesc(collInfo *model.Collection, aliases []string) *milvuspb.
 	return resp
 }
 
-// DescribeCollection return collection info
+func (c *Core) describeCollectionImpl(ctx context.Context, in *milvuspb.DescribeCollectionRequest, allowUnavailable bool) (*milvuspb.DescribeCollectionResponse, error) {
-func (c *Core) DescribeCollection(ctx context.Context, in *milvuspb.DescribeCollectionRequest) (*milvuspb.DescribeCollectionResponse, error) {
 	if code, ok := c.checkHealthy(); !ok {
 		return &milvuspb.DescribeCollectionResponse{
 			Status: failStatus(commonpb.ErrorCode_UnexpectedError, "StateCode"+commonpb.StateCode_name[int32(code)]),
@@ -966,16 +965,18 @@ func (c *Core) DescribeCollection(ctx context.Context, in *milvuspb.DescribeColl
 	ts := getTravelTs(in)
 	log := log.Ctx(ctx).With(zap.String("collection name", in.GetCollectionName()),
 		zap.Int64("id", in.GetCollectionID()),
-		zap.Uint64("ts", ts))
+		zap.Uint64("ts", ts),
+		zap.Bool("allowUnavailable", allowUnavailable))
 
 	// TODO(longjiquan): log may be very frequent here.
 
 	log.Info("received request to describe collection")
 
 	t := &describeCollectionTask{
-		baseTask: newBaseTask(ctx, c),
+		baseTask:         newBaseTask(ctx, c),
-		Req:      in,
+		Req:              in,
-		Rsp:      &milvuspb.DescribeCollectionResponse{},
+		Rsp:              &milvuspb.DescribeCollectionResponse{},
+		allowUnavailable: allowUnavailable,
 	}
 
 	if err := c.scheduler.AddTask(t); err != nil {
@@ -984,6 +985,7 @@ func (c *Core) DescribeCollection(ctx context.Context, in *milvuspb.DescribeColl
 		return &milvuspb.DescribeCollectionResponse{
 			// TODO: use commonpb.ErrorCode_CollectionNotExists. SDK use commonpb.ErrorCode_UnexpectedError now.
 			Status: failStatus(commonpb.ErrorCode_UnexpectedError, err.Error()),
+			// Status: common.StatusFromError(err),
 		}, nil
 	}
 
@@ -993,6 +995,7 @@ func (c *Core) DescribeCollection(ctx context.Context, in *milvuspb.DescribeColl
 		return &milvuspb.DescribeCollectionResponse{
 			// TODO: use commonpb.ErrorCode_CollectionNotExists. SDK use commonpb.ErrorCode_UnexpectedError now.
 			Status: failStatus(commonpb.ErrorCode_UnexpectedError, err.Error()),
+			// Status: common.StatusFromError(err),
 		}, nil
 	}
 
@@ -1004,6 +1007,21 @@ func (c *Core) DescribeCollection(ctx context.Context, in *milvuspb.DescribeColl
 	return t.Rsp, nil
 }
 
+// DescribeCollection return collection info
+func (c *Core) DescribeCollection(ctx context.Context, in *milvuspb.DescribeCollectionRequest) (*milvuspb.DescribeCollectionResponse, error) {
+	return c.describeCollectionImpl(ctx, in, false)
+}
+
+// DescribeCollectionInternal same to DescribeCollection, but will return unavailable collections and
+// only used in internal RPC.
+// When query cluster tried to do recovery, it'll be healthy until all collections' targets were recovered,
+// so during this time, releasing request generated by rootcoord's recovery won't succeed. So in theory, rootcoord goes
+// to be healthy, querycoord recovers all collections' targets, and then querycoord serves the releasing request sent
+// by rootcoord, eventually, the dropping collections will be released.
+func (c *Core) DescribeCollectionInternal(ctx context.Context, in *milvuspb.DescribeCollectionRequest) (*milvuspb.DescribeCollectionResponse, error) {
+	return c.describeCollectionImpl(ctx, in, true)
+}
+
 // ShowCollections list all collection names
 func (c *Core) ShowCollections(ctx context.Context, in *milvuspb.ShowCollectionsRequest) (*milvuspb.ShowCollectionsResponse, error) {
 	if code, ok := c.checkHealthy(); !ok {
@@ -1269,8 +1287,7 @@ func (c *Core) HasPartition(ctx context.Context, in *milvuspb.HasPartitionReques
 	return t.Rsp, nil
 }
 
-// ShowPartitions list all partition names
+func (c *Core) showPartitionsImpl(ctx context.Context, in *milvuspb.ShowPartitionsRequest, allowUnavailable bool) (*milvuspb.ShowPartitionsResponse, error) {
-func (c *Core) ShowPartitions(ctx context.Context, in *milvuspb.ShowPartitionsRequest) (*milvuspb.ShowPartitionsResponse, error) {
 	if code, ok := c.checkHealthy(); !ok {
 		return &milvuspb.ShowPartitionsResponse{
 			Status: failStatus(commonpb.ErrorCode_UnexpectedError, "StateCode="+commonpb.StateCode_name[int32(code)]),
@@ -1280,14 +1297,15 @@ func (c *Core) ShowPartitions(ctx context.Context, in *milvuspb.ShowPartitionsRe
 	metrics.RootCoordDDLReqCounter.WithLabelValues("ShowPartitions", metrics.TotalLabel).Inc()
 	tr := timerecord.NewTimeRecorder("ShowPartitions")
 
-	log := log.Ctx(ctx).With(zap.String("collection", in.GetCollectionName()))
+	log := log.Ctx(ctx).With(zap.String("collection", in.GetCollectionName()), zap.Bool("allowUnavailable", allowUnavailable))
 
 	log.Info("received request to show partitions")
 
 	t := &showPartitionTask{
-		baseTask: newBaseTask(ctx, c),
+		baseTask:         newBaseTask(ctx, c),
-		Req:      in,
+		Req:              in,
-		Rsp:      &milvuspb.ShowPartitionsResponse{},
+		Rsp:              &milvuspb.ShowPartitionsResponse{},
+		allowUnavailable: allowUnavailable,
 	}
 
 	if err := c.scheduler.AddTask(t); err != nil {
@@ -1295,6 +1313,7 @@ func (c *Core) ShowPartitions(ctx context.Context, in *milvuspb.ShowPartitionsRe
 		metrics.RootCoordDDLReqCounter.WithLabelValues("ShowPartitions", metrics.FailLabel).Inc()
 		return &milvuspb.ShowPartitionsResponse{
 			Status: failStatus(commonpb.ErrorCode_UnexpectedError, "ShowPartitions failed: "+err.Error()),
+			// Status: common.StatusFromError(err),
 		}, nil
 	}
 
@@ -1303,6 +1322,7 @@ func (c *Core) ShowPartitions(ctx context.Context, in *milvuspb.ShowPartitionsRe
 		metrics.RootCoordDDLReqCounter.WithLabelValues("ShowPartitions", metrics.FailLabel).Inc()
 		return &milvuspb.ShowPartitionsResponse{
 			Status: failStatus(commonpb.ErrorCode_UnexpectedError, "ShowPartitions failed: "+err.Error()),
+			// Status: common.StatusFromError(err),
 		}, nil
 	}
 
@@ -1314,6 +1334,16 @@ func (c *Core) ShowPartitions(ctx context.Context, in *milvuspb.ShowPartitionsRe
 	return t.Rsp, nil
 }
 
+// ShowPartitions list all partition names
+func (c *Core) ShowPartitions(ctx context.Context, in *milvuspb.ShowPartitionsRequest) (*milvuspb.ShowPartitionsResponse, error) {
+	return c.showPartitionsImpl(ctx, in, false)
+}
+
+// ShowPartitionsInternal same to ShowPartitions, only used in internal RPC.
+func (c *Core) ShowPartitionsInternal(ctx context.Context, in *milvuspb.ShowPartitionsRequest) (*milvuspb.ShowPartitionsResponse, error) {
+	return c.showPartitionsImpl(ctx, in, true)
+}
+
 // ShowSegments list all segments
 func (c *Core) ShowSegments(ctx context.Context, in *milvuspb.ShowSegmentsRequest) (*milvuspb.ShowSegmentsResponse, error) {
 	// ShowSegments Only used in GetPersistentSegmentInfo, it's already deprecated for a long time.

internal/rootcoord/root_coord_test.go

@@ -322,6 +322,9 @@ func TestRootCoord_DescribeCollection(t *testing.T) {
 		resp, err := c.DescribeCollection(ctx, &milvuspb.DescribeCollectionRequest{})
 		assert.NoError(t, err)
 		assert.NotEqual(t, commonpb.ErrorCode_Success, resp.GetStatus().GetErrorCode())
+		resp, err = c.DescribeCollectionInternal(ctx, &milvuspb.DescribeCollectionRequest{})
+		assert.NoError(t, err)
+		assert.NotEqual(t, commonpb.ErrorCode_Success, resp.GetStatus().GetErrorCode())
 	})
 
 	t.Run("failed to add task", func(t *testing.T) {
@@ -332,6 +335,9 @@ func TestRootCoord_DescribeCollection(t *testing.T) {
 		resp, err := c.DescribeCollection(ctx, &milvuspb.DescribeCollectionRequest{})
 		assert.NoError(t, err)
 		assert.NotEqual(t, commonpb.ErrorCode_Success, resp.GetStatus().GetErrorCode())
+		resp, err = c.DescribeCollectionInternal(ctx, &milvuspb.DescribeCollectionRequest{})
+		assert.NoError(t, err)
+		assert.NotEqual(t, commonpb.ErrorCode_Success, resp.GetStatus().GetErrorCode())
 	})
 
 	t.Run("failed to execute", func(t *testing.T) {
@@ -342,6 +348,9 @@ func TestRootCoord_DescribeCollection(t *testing.T) {
 		resp, err := c.DescribeCollection(ctx, &milvuspb.DescribeCollectionRequest{})
 		assert.NoError(t, err)
 		assert.NotEqual(t, commonpb.ErrorCode_Success, resp.GetStatus().GetErrorCode())
+		resp, err = c.DescribeCollectionInternal(ctx, &milvuspb.DescribeCollectionRequest{})
+		assert.NoError(t, err)
+		assert.NotEqual(t, commonpb.ErrorCode_Success, resp.GetStatus().GetErrorCode())
 	})
 
 	t.Run("normal case, everything is ok", func(t *testing.T) {
@@ -352,6 +361,9 @@ func TestRootCoord_DescribeCollection(t *testing.T) {
 		resp, err := c.DescribeCollection(ctx, &milvuspb.DescribeCollectionRequest{})
 		assert.NoError(t, err)
 		assert.Equal(t, commonpb.ErrorCode_Success, resp.GetStatus().GetErrorCode())
+		resp, err = c.DescribeCollectionInternal(ctx, &milvuspb.DescribeCollectionRequest{})
+		assert.NoError(t, err)
+		assert.Equal(t, commonpb.ErrorCode_Success, resp.GetStatus().GetErrorCode())
 	})
 }
 
@@ -482,6 +494,9 @@ func TestRootCoord_ShowPartitions(t *testing.T) {
 		resp, err := c.ShowPartitions(ctx, &milvuspb.ShowPartitionsRequest{})
 		assert.NoError(t, err)
 		assert.NotEqual(t, commonpb.ErrorCode_Success, resp.GetStatus().GetErrorCode())
+		resp, err = c.ShowPartitionsInternal(ctx, &milvuspb.ShowPartitionsRequest{})
+		assert.NoError(t, err)
+		assert.NotEqual(t, commonpb.ErrorCode_Success, resp.GetStatus().GetErrorCode())
 	})
 
 	t.Run("failed to add task", func(t *testing.T) {
@@ -492,6 +507,9 @@ func TestRootCoord_ShowPartitions(t *testing.T) {
 		resp, err := c.ShowPartitions(ctx, &milvuspb.ShowPartitionsRequest{})
 		assert.NoError(t, err)
 		assert.NotEqual(t, commonpb.ErrorCode_Success, resp.GetStatus().GetErrorCode())
+		resp, err = c.ShowPartitionsInternal(ctx, &milvuspb.ShowPartitionsRequest{})
+		assert.NoError(t, err)
+		assert.NotEqual(t, commonpb.ErrorCode_Success, resp.GetStatus().GetErrorCode())
 	})
 
 	t.Run("failed to execute", func(t *testing.T) {
@@ -501,6 +519,9 @@ func TestRootCoord_ShowPartitions(t *testing.T) {
 		resp, err := c.ShowPartitions(ctx, &milvuspb.ShowPartitionsRequest{})
 		assert.NoError(t, err)
 		assert.NotEqual(t, commonpb.ErrorCode_Success, resp.GetStatus().GetErrorCode())
+		resp, err = c.ShowPartitionsInternal(ctx, &milvuspb.ShowPartitionsRequest{})
+		assert.NoError(t, err)
+		assert.NotEqual(t, commonpb.ErrorCode_Success, resp.GetStatus().GetErrorCode())
 	})
 
 	t.Run("normal case, everything is ok", func(t *testing.T) {
@@ -510,6 +531,9 @@ func TestRootCoord_ShowPartitions(t *testing.T) {
 		resp, err := c.ShowPartitions(ctx, &milvuspb.ShowPartitionsRequest{})
 		assert.NoError(t, err)
 		assert.Equal(t, commonpb.ErrorCode_Success, resp.GetStatus().GetErrorCode())
+		resp, err = c.ShowPartitionsInternal(ctx, &milvuspb.ShowPartitionsRequest{})
+		assert.NoError(t, err)
+		assert.Equal(t, commonpb.ErrorCode_Success, resp.GetStatus().GetErrorCode())
 	})
 }
 
@@ -1381,7 +1405,7 @@ func TestRootcoord_EnableActiveStandby(t *testing.T) {
 		},
 		CollectionName: "unexist"})
 	assert.NoError(t, err)
-	assert.Equal(t, commonpb.ErrorCode_UnexpectedError, resp.GetStatus().GetErrorCode())
+	assert.NotEqual(t, commonpb.ErrorCode_Success, resp.GetStatus().GetErrorCode())
 	err = core.Stop()
 	assert.NoError(t, err)
 }

internal/rootcoord/show_partition_task.go

@@ -13,8 +13,9 @@ import (
 // showPartitionTask show partition request task
 type showPartitionTask struct {
 	baseTask
-	Req *milvuspb.ShowPartitionsRequest
+	Req              *milvuspb.ShowPartitionsRequest
-	Rsp *milvuspb.ShowPartitionsResponse
+	Rsp              *milvuspb.ShowPartitionsResponse
+	allowUnavailable bool
 }
 
 func (t *showPartitionTask) Prepare(ctx context.Context) error {
@@ -30,7 +31,7 @@ func (t *showPartitionTask) Execute(ctx context.Context) error {
 	var err error
 	t.Rsp.Status = succStatus()
 	if t.Req.GetCollectionName() == "" {
-		coll, err = t.core.meta.GetCollectionByID(ctx, t.Req.GetCollectionID(), typeutil.MaxTimestamp)
+		coll, err = t.core.meta.GetCollectionByID(ctx, t.Req.GetCollectionID(), typeutil.MaxTimestamp, t.allowUnavailable)
 	} else {
 		coll, err = t.core.meta.GetCollectionByName(ctx, t.Req.GetCollectionName(), typeutil.MaxTimestamp)
 	}

internal/rootcoord/show_partition_task_test.go

@@ -80,7 +80,7 @@ func Test_showPartitionTask_Execute(t *testing.T) {
 
 	t.Run("success", func(t *testing.T) {
 		meta := newMockMetaTable()
-		meta.GetCollectionByIDFunc = func(ctx context.Context, collectionID typeutil.UniqueID, ts Timestamp) (*model.Collection, error) {
+		meta.GetCollectionByIDFunc = func(ctx context.Context, collectionID typeutil.UniqueID, ts Timestamp, allowUnavailable bool) (*model.Collection, error) {
 			return &model.Collection{
 				CollectionID: collectionID,
 				Name:         "test coll",

internal/types/types.go

@@ -507,6 +507,10 @@ type RootCoord interface {
 	// error is always nil
 	DescribeCollection(ctx context.Context, req *milvuspb.DescribeCollectionRequest) (*milvuspb.DescribeCollectionResponse, error)
 
+	// DescribeCollectionInternal same to DescribeCollection, only used in internal RPC.
+	// Besides, it'll also return unavailable collection, for example, creating, dropping.
+	DescribeCollectionInternal(ctx context.Context, req *milvuspb.DescribeCollectionRequest) (*milvuspb.DescribeCollectionResponse, error)
+
 	// ShowCollections notifies RootCoord to list all collection names and other info in database at specified timestamp
 	//
 	// ctx is the context to control request deadline and cancellation
@@ -571,6 +575,9 @@ type RootCoord interface {
 	// error is always nil
 	ShowPartitions(ctx context.Context, req *milvuspb.ShowPartitionsRequest) (*milvuspb.ShowPartitionsResponse, error)
 
+	// ShowPartitionsInternal same to ShowPartitions, but will return unavailable resources and only used in internal.
+	ShowPartitionsInternal(ctx context.Context, req *milvuspb.ShowPartitionsRequest) (*milvuspb.ShowPartitionsResponse, error)
+
 	// CreateIndex notifies RootCoord to create an index for the specified field in the collection
 	//
 	// ctx is the context to control request deadline and cancellation

internal/util/mock/grpc_rootcoord_client.go

@@ -97,6 +97,10 @@ func (m *GrpcRootCoordClient) DescribeCollection(ctx context.Context, in *milvus
 	return &milvuspb.DescribeCollectionResponse{}, m.Err
 }
 
+func (m *GrpcRootCoordClient) DescribeCollectionInternal(ctx context.Context, in *milvuspb.DescribeCollectionRequest, opts ...grpc.CallOption) (*milvuspb.DescribeCollectionResponse, error) {
+	return &milvuspb.DescribeCollectionResponse{}, m.Err
+}
+
 func (m *GrpcRootCoordClient) CreateAlias(ctx context.Context, in *milvuspb.CreateAliasRequest, opts ...grpc.CallOption) (*commonpb.Status, error) {
 	return &commonpb.Status{}, m.Err
 }
@@ -129,6 +133,10 @@ func (m *GrpcRootCoordClient) ShowPartitions(ctx context.Context, in *milvuspb.S
 	return &milvuspb.ShowPartitionsResponse{}, m.Err
 }
 
+func (m *GrpcRootCoordClient) ShowPartitionsInternal(ctx context.Context, in *milvuspb.ShowPartitionsRequest, opts ...grpc.CallOption) (*milvuspb.ShowPartitionsResponse, error) {
+	return &milvuspb.ShowPartitionsResponse{}, m.Err
+}
+
 func (m *GrpcRootCoordClient) DescribeSegment(ctx context.Context, in *milvuspb.DescribeSegmentRequest, opts ...grpc.CallOption) (*milvuspb.DescribeSegmentResponse, error) {
 	return &milvuspb.DescribeSegmentResponse{}, m.Err
 }