Mark deleted before drop index (#17490)

Signed-off-by: Cai.Zhang <cai.zhang@zilliz.com>

internal/distributed/indexcoord/client/client.go

@@ -181,6 +181,19 @@ func (c *Client) DropIndex(ctx context.Context, req *indexpb.DropIndexRequest) (
 	return ret.(*commonpb.Status), err
 }
 
+func (c *Client) RemoveIndex(ctx context.Context, req *indexpb.RemoveIndexRequest) (*commonpb.Status, error) {
+	ret, err := c.grpcClient.ReCall(ctx, func(client interface{}) (interface{}, error) {
+		if !funcutil.CheckCtxValid(ctx) {
+			return nil, ctx.Err()
+		}
+		return client.(indexpb.IndexCoordClient).RemoveIndex(ctx, req)
+	})
+	if err != nil || ret == nil {
+		return nil, err
+	}
+	return ret.(*commonpb.Status), err
+}
+
 // GetIndexStates gets the index states from IndexCoord.
 func (c *Client) GetIndexStates(ctx context.Context, req *indexpb.GetIndexStatesRequest) (*indexpb.GetIndexStatesResponse, error) {
 	ret, err := c.grpcClient.ReCall(ctx, func(client interface{}) (interface{}, error) {

internal/distributed/indexcoord/client/client_test.go

@@ -102,6 +102,15 @@ func TestIndexCoordClient(t *testing.T) {
 		assert.Equal(t, commonpb.ErrorCode_Success, resp.ErrorCode)
 	})
 
+	t.Run("RemoveIndex", func(t *testing.T) {
+		req := &indexpb.RemoveIndexRequest{
+			BuildIDs: []int64{0},
+		}
+		resp, err := icc.RemoveIndex(ctx, req)
+		assert.Nil(t, err)
+		assert.Equal(t, commonpb.ErrorCode_Success, resp.ErrorCode)
+	})
+
 	t.Run("GetIndexStates", func(t *testing.T) {
 		req := &indexpb.GetIndexStatesRequest{
 			IndexBuildIDs: []int64{0},

internal/distributed/indexcoord/service.go

@@ -227,6 +227,10 @@ func (s *Server) DropIndex(ctx context.Context, request *indexpb.DropIndexReques
 	return s.indexcoord.DropIndex(ctx, request)
 }
 
+func (s *Server) RemoveIndex(ctx context.Context, req *indexpb.RemoveIndexRequest) (*commonpb.Status, error) {
+	return s.indexcoord.RemoveIndex(ctx, req)
+}
+
 // GetIndexFilePaths gets the index file paths from IndexCoord.
 func (s *Server) GetIndexFilePaths(ctx context.Context, req *indexpb.GetIndexFilePathsRequest) (*indexpb.GetIndexFilePathsResponse, error) {
 	return s.indexcoord.GetIndexFilePaths(ctx, req)

internal/distributed/indexcoord/service_test.go

@@ -102,6 +102,15 @@ func TestIndexCoordinateServer(t *testing.T) {
 		assert.Equal(t, commonpb.ErrorCode_Success, resp.ErrorCode)
 	})
 
+	t.Run("RemoveIndex", func(t *testing.T) {
+		req := &indexpb.RemoveIndexRequest{
+			BuildIDs: []UniqueID{0},
+		}
+		resp, err := server.RemoveIndex(ctx, req)
+		assert.Nil(t, err)
+		assert.Equal(t, commonpb.ErrorCode_Success, resp.ErrorCode)
+	})
+
 	t.Run("GetIndexFilePaths", func(t *testing.T) {
 		req := &indexpb.GetIndexFilePathsRequest{
 			IndexBuildIDs: []UniqueID{0, 1},

internal/distributed/proxy/service_test.go

@@ -291,6 +291,10 @@ func (m *MockIndexCoord) DropIndex(ctx context.Context, req *indexpb.DropIndexRe
 	return nil, nil
 }
 
+func (m *MockIndexCoord) RemoveIndex(ctx context.Context, req *indexpb.RemoveIndexRequest) (*commonpb.Status, error) {
+	return nil, nil
+}
+
 func (m *MockIndexCoord) GetIndexStates(ctx context.Context, req *indexpb.GetIndexStatesRequest) (*indexpb.GetIndexStatesResponse, error) {
 	return nil, nil
 }

internal/distributed/rootcoord/service_test.go

@@ -208,6 +208,10 @@ func TestGrpcService(t *testing.T) {
 		return nil
 	}
 
+	core.CallRemoveIndexService = func(ctx context.Context, buildIDs []rootcoord.UniqueID) error {
+		return nil
+	}
+
 	collectionMetaCache := make([]string, 0, 16)
 	pnm := proxyMock{}
 	core.NewProxyClient = func(*sessionutil.Session) (types.Proxy, error) {
@@ -738,10 +742,17 @@ func TestGrpcService(t *testing.T) {
 		assert.Nil(t, err)
 		assert.Equal(t, commonpb.ErrorCode_Success, rsp.ErrorCode)
 
+		for {
 			dropIDLock.Lock()
-		assert.Equal(t, 1, len(dropID))
+			if len(dropID) == 1 {
 				assert.Equal(t, idx[0].IndexID, dropID[0])
 				dropIDLock.Unlock()
+				break
+			}
+			dropIDLock.Unlock()
+			time.Sleep(time.Second)
+		}
+
 	})
 
 	t.Run("drop partition", func(t *testing.T) {

internal/indexcoord/index_coord.go

@@ -567,6 +567,36 @@ func (i *IndexCoord) DropIndex(ctx context.Context, req *indexpb.DropIndexReques
 	return ret, nil
 }
 
+func (i *IndexCoord) RemoveIndex(ctx context.Context, req *indexpb.RemoveIndexRequest) (*commonpb.Status, error) {
+	log.Info("IndexCoord receive RemoveIndex", zap.Int64s("buildIDs", req.BuildIDs))
+
+	if !i.isHealthy() {
+		errMsg := "IndexCoord is not healthy"
+		log.Warn(errMsg)
+		return &commonpb.Status{
+			ErrorCode: commonpb.ErrorCode_UnexpectedError,
+			Reason:    errMsg,
+		}, nil
+	}
+
+	sp, _ := trace.StartSpanFromContextWithOperationName(ctx, "IndexCoord-RemoveIndex")
+	defer sp.Finish()
+
+	ret := &commonpb.Status{
+		ErrorCode: commonpb.ErrorCode_Success,
+	}
+	err := i.metaTable.MarkIndexAsDeletedByBuildIDs(req.GetBuildIDs())
+	if err != nil {
+		log.Error("IndexCoord MarkIndexAsDeletedByBuildIDs failed", zap.Int64s("buildIDs", req.GetBuildIDs()),
+			zap.Error(err))
+		ret.ErrorCode = commonpb.ErrorCode_UnexpectedError
+		ret.Reason = err.Error()
+		return ret, nil
+	}
+
+	return ret, nil
+}
+
 // GetIndexFilePaths gets the index file paths from IndexCoord.
 func (i *IndexCoord) GetIndexFilePaths(ctx context.Context, req *indexpb.GetIndexFilePathsRequest) (*indexpb.GetIndexFilePathsResponse, error) {
 	log.Debug("IndexCoord GetIndexFilePaths", zap.Int("number of IndexBuildIds", len(req.IndexBuildIDs)))

internal/indexcoord/index_coord_mock.go

@@ -252,6 +252,17 @@ func (icm *Mock) GetMetrics(ctx context.Context, request *milvuspb.GetMetricsReq
 	}, nil
 }
 
+func (icm *Mock) RemoveIndex(ctx context.Context, request *indexpb.RemoveIndexRequest) (*commonpb.Status, error) {
+	if icm.Failure {
+		return &commonpb.Status{
+			ErrorCode: commonpb.ErrorCode_UnexpectedError,
+		}, errors.New("IndexCoordinator RemoveIndex failed")
+	}
+	return &commonpb.Status{
+		ErrorCode: commonpb.ErrorCode_Success,
+	}, nil
+}
+
 type DataCoordMock struct {
 	types.DataCoord
 

internal/indexcoord/index_coord_mock_test.go

@@ -117,6 +117,15 @@ func TestIndexCoordMock(t *testing.T) {
 		assert.Equal(t, "IndexCoord", resp.ComponentName)
 	})
 
+	t.Run("RemoveIndex", func(t *testing.T) {
+		req := &indexpb.RemoveIndexRequest{
+			BuildIDs: []UniqueID{},
+		}
+		status, err := icm.RemoveIndex(ctx, req)
+		assert.Nil(t, err)
+		assert.Equal(t, commonpb.ErrorCode_Success, status.GetErrorCode())
+	})
+
 	err = icm.Stop()
 	assert.Nil(t, err)
 }
@@ -200,6 +209,15 @@ func TestIndexCoordMockError(t *testing.T) {
 		assert.Equal(t, commonpb.ErrorCode_UnexpectedError, resp.Status.ErrorCode)
 	})
 
+	t.Run("RemoveIndex", func(t *testing.T) {
+		req := &indexpb.RemoveIndexRequest{
+			BuildIDs: []UniqueID{},
+		}
+		status, err := icm.RemoveIndex(ctx, req)
+		assert.Error(t, err)
+		assert.Equal(t, commonpb.ErrorCode_UnexpectedError, status.GetErrorCode())
+	})
+
 	err = icm.Stop()
 	assert.NotNil(t, err)
 }

internal/indexcoord/index_coord_test.go

@@ -362,6 +362,11 @@ func TestIndexCoord_NotHealthy(t *testing.T) {
 	resp4, err := ic.GetIndexFilePaths(context.Background(), req4)
 	assert.Nil(t, err)
 	assert.Equal(t, commonpb.ErrorCode_UnexpectedError, resp4.Status.ErrorCode)
+
+	req5 := &indexpb.RemoveIndexRequest{}
+	resp5, err := ic.RemoveIndex(context.Background(), req5)
+	assert.Nil(t, err)
+	assert.Equal(t, commonpb.ErrorCode_UnexpectedError, resp5.GetErrorCode())
 }
 
 func TestIndexCoord_GetIndexFilePaths(t *testing.T) {
@@ -470,3 +475,13 @@ func Test_tryReleaseSegmentReferLock(t *testing.T) {
 		assert.NoError(t, err)
 	})
 }
+
+func TestIndexCoord_RemoveIndex(t *testing.T) {
+	ic := &IndexCoord{
+		metaTable: &metaTable{},
+	}
+	ic.stateCode.Store(internalpb.StateCode_Healthy)
+	status, err := ic.RemoveIndex(context.Background(), &indexpb.RemoveIndexRequest{BuildIDs: []UniqueID{0}})
+	assert.Nil(t, err)
+	assert.Equal(t, commonpb.ErrorCode_Success, status.GetErrorCode())
+}

internal/indexcoord/meta_table.go

@@ -281,6 +281,42 @@ func (mt *metaTable) MarkIndexAsDeleted(indexID UniqueID) error {
 	return nil
 }
 
+func (mt *metaTable) MarkIndexAsDeletedByBuildIDs(buildIDs []UniqueID) error {
+	mt.lock.Lock()
+	defer mt.lock.Unlock()
+
+	log.Debug("IndexCoord metaTable MarkIndexAsDeletedByBuildIDs ", zap.Int64s("buildIDs", buildIDs))
+
+	for _, buildID := range buildIDs {
+		if meta, ok := mt.indexBuildID2Meta[buildID]; ok {
+			clonedMeta := &Meta{
+				indexMeta: proto.Clone(meta.indexMeta).(*indexpb.IndexMeta),
+				revision:  meta.revision,
+			}
+			clonedMeta.indexMeta.MarkDeleted = true
+			// marshal inside
+			/* #nosec G601 */
+			if err := mt.saveIndexMeta(clonedMeta); err != nil {
+				log.Error("IndexCoord metaTable MarkIndexAsDeleted saveIndexMeta failed", zap.Error(err))
+				fn := func() error {
+					m, err := mt.reloadMeta(meta.indexMeta.IndexBuildID)
+					if m == nil {
+						return err
+					}
+
+					m.indexMeta.MarkDeleted = true
+					return mt.saveIndexMeta(m)
+				}
+				err2 := retry.Do(context.TODO(), fn, retry.Attempts(5))
+				if err2 != nil {
+					return err2
+				}
+			}
+		}
+	}
+	return nil
+}
+
 // GetIndexStates gets the index states from meta table.
 func (mt *metaTable) GetIndexStates(indexBuildIDs []UniqueID) []*indexpb.IndexInfo {
 	mt.lock.Lock()

internal/indexcoord/meta_table_test.go

@@ -17,6 +17,7 @@
 package indexcoord
 
 import (
+	"path"
 	"strconv"
 	"testing"
 
@@ -145,6 +146,17 @@ func TestMetaTable(t *testing.T) {
 		assert.Equal(t, "index 1 has been deleted", indexInfos[1].Reason)
 	})
 
+	t.Run("MarkSegmentIndexAsDeleted", func(t *testing.T) {
+		indexMeta1.Version = indexMeta1.Version + 1
+		value, err = proto.Marshal(indexMeta1)
+		assert.Nil(t, err)
+		key = path.Join(indexFilePrefix, strconv.FormatInt(indexMeta1.IndexBuildID, 10))
+		err = etcdKV.Save(key, string(value))
+		assert.Nil(t, err)
+		err = metaTable.MarkIndexAsDeletedByBuildIDs([]UniqueID{indexMeta1.IndexBuildID})
+		assert.Nil(t, err)
+	})
+
 	t.Run("GetIndexFilePathInfo", func(t *testing.T) {
 		indexFilePathInfo, err := metaTable.GetIndexFilePathInfo(0)
 		assert.Nil(t, indexFilePathInfo)

internal/proto/etcd_meta.proto

@@ -15,6 +15,7 @@ message IndexInfo {
   string index_name = 1;
   int64 indexID = 2;
   repeated common.KeyValuePair index_params = 3;
+  bool deleted = 4;
 }
 
 message FieldIndexInfo{

internal/proto/etcdpb/etcd_meta.pb.go

@@ -81,6 +81,7 @@ type IndexInfo struct {
 	IndexName            string                   `protobuf:"bytes,1,opt,name=index_name,json=indexName,proto3" json:"index_name,omitempty"`
 	IndexID              int64                    `protobuf:"varint,2,opt,name=indexID,proto3" json:"indexID,omitempty"`
 	IndexParams          []*commonpb.KeyValuePair `protobuf:"bytes,3,rep,name=index_params,json=indexParams,proto3" json:"index_params,omitempty"`
+	Deleted              bool                     `protobuf:"varint,4,opt,name=deleted,proto3" json:"deleted,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}                 `json:"-"`
 	XXX_unrecognized     []byte                   `json:"-"`
 	XXX_sizecache        int32                    `json:"-"`
@@ -132,6 +133,13 @@ func (m *IndexInfo) GetIndexParams() []*commonpb.KeyValuePair {
 	return nil
 }
 
+func (m *IndexInfo) GetDeleted() bool {
+	if m != nil {
+		return m.Deleted
+	}
+	return false
+}
+
 type FieldIndexInfo struct {
 	FiledID              int64    `protobuf:"varint,1,opt,name=filedID,proto3" json:"filedID,omitempty"`
 	IndexID              int64    `protobuf:"varint,2,opt,name=indexID,proto3" json:"indexID,omitempty"`
@@ -492,52 +500,52 @@ func init() {
 func init() { proto.RegisterFile("etcd_meta.proto", fileDescriptor_975d306d62b73e88) }
 
 var fileDescriptor_975d306d62b73e88 = []byte{
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+	// 751 bytes of a gzipped FileDescriptorProto
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 }

internal/proto/index_coord.proto

@@ -17,6 +17,7 @@ service IndexCoord {
   rpc GetIndexStates(GetIndexStatesRequest) returns (GetIndexStatesResponse) {}
   rpc GetIndexFilePaths(GetIndexFilePathsRequest) returns (GetIndexFilePathsResponse){}
   rpc DropIndex(DropIndexRequest) returns (common.Status) {}
+  rpc RemoveIndex(RemoveIndexRequest) returns (common.Status) {}
 
   // https://wiki.lfaidata.foundation/display/MIL/MEP+8+--+Add+metrics+for+proxy
   rpc GetMetrics(milvus.GetMetricsRequest) returns (milvus.GetMetricsResponse) {}
@@ -120,3 +121,7 @@ message IndexMeta {
 message DropIndexRequest {
   int64 indexID = 1;
 }
+
+message RemoveIndexRequest {
+  repeated int64 buildIDs = 1;
+}

internal/proto/indexpb/index_coord.pb.go

@@ -831,6 +831,45 @@ func (m *DropIndexRequest) GetIndexID() int64 {
 	return 0
 }
 
+type RemoveIndexRequest struct {
+	BuildIDs             []int64  `protobuf:"varint,1,rep,packed,name=buildIDs,proto3" json:"buildIDs,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *RemoveIndexRequest) Reset()         { *m = RemoveIndexRequest{} }
+func (m *RemoveIndexRequest) String() string { return proto.CompactTextString(m) }
+func (*RemoveIndexRequest) ProtoMessage()    {}
+func (*RemoveIndexRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_f9e019eb3fda53c2, []int{13}
+}
+
+func (m *RemoveIndexRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_RemoveIndexRequest.Unmarshal(m, b)
+}
+func (m *RemoveIndexRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_RemoveIndexRequest.Marshal(b, m, deterministic)
+}
+func (m *RemoveIndexRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_RemoveIndexRequest.Merge(m, src)
+}
+func (m *RemoveIndexRequest) XXX_Size() int {
+	return xxx_messageInfo_RemoveIndexRequest.Size(m)
+}
+func (m *RemoveIndexRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_RemoveIndexRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_RemoveIndexRequest proto.InternalMessageInfo
+
+func (m *RemoveIndexRequest) GetBuildIDs() []int64 {
+	if m != nil {
+		return m.BuildIDs
+	}
+	return nil
+}
+
 func init() {
 	proto.RegisterType((*RegisterNodeRequest)(nil), "milvus.proto.index.RegisterNodeRequest")
 	proto.RegisterType((*RegisterNodeResponse)(nil), "milvus.proto.index.RegisterNodeResponse")
@@ -845,80 +884,83 @@ func init() {
 	proto.RegisterType((*GetIndexFilePathsResponse)(nil), "milvus.proto.index.GetIndexFilePathsResponse")
 	proto.RegisterType((*IndexMeta)(nil), "milvus.proto.index.IndexMeta")
 	proto.RegisterType((*DropIndexRequest)(nil), "milvus.proto.index.DropIndexRequest")
+	proto.RegisterType((*RemoveIndexRequest)(nil), "milvus.proto.index.RemoveIndexRequest")
 }
 
 func init() { proto.RegisterFile("index_coord.proto", fileDescriptor_f9e019eb3fda53c2) }
 
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+	// 1118 bytes of a gzipped FileDescriptorProto
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+	0x46, 0x3d, 0x84, 0x5a, 0xe6, 0xa5, 0x5f, 0x5c, 0x18, 0xb3, 0xbf, 0x02, 0xff, 0x76, 0x61, 0x6c,
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+	0xfe, 0xda, 0x4c, 0x18, 0xda, 0x54, 0x9e, 0x36, 0x55, 0x1a, 0xa3, 0xa3, 0xa3, 0x92, 0x12, 0x5f,
+	0xfc, 0x19, 0x00, 0x00, 0xff, 0xff, 0xa7, 0x8e, 0x84, 0xfb, 0xed, 0x0f, 0x00, 0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -940,6 +982,7 @@ type IndexCoordClient interface {
 	GetIndexStates(ctx context.Context, in *GetIndexStatesRequest, opts ...grpc.CallOption) (*GetIndexStatesResponse, error)
 	GetIndexFilePaths(ctx context.Context, in *GetIndexFilePathsRequest, opts ...grpc.CallOption) (*GetIndexFilePathsResponse, error)
 	DropIndex(ctx context.Context, in *DropIndexRequest, opts ...grpc.CallOption) (*commonpb.Status, error)
+	RemoveIndex(ctx context.Context, in *RemoveIndexRequest, opts ...grpc.CallOption) (*commonpb.Status, error)
 	// https://wiki.lfaidata.foundation/display/MIL/MEP+8+--+Add+metrics+for+proxy
 	GetMetrics(ctx context.Context, in *milvuspb.GetMetricsRequest, opts ...grpc.CallOption) (*milvuspb.GetMetricsResponse, error)
 }
@@ -1015,6 +1058,15 @@ func (c *indexCoordClient) DropIndex(ctx context.Context, in *DropIndexRequest,
 	return out, nil
 }
 
+func (c *indexCoordClient) RemoveIndex(ctx context.Context, in *RemoveIndexRequest, opts ...grpc.CallOption) (*commonpb.Status, error) {
+	out := new(commonpb.Status)
+	err := c.cc.Invoke(ctx, "/milvus.proto.index.IndexCoord/RemoveIndex", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 func (c *indexCoordClient) GetMetrics(ctx context.Context, in *milvuspb.GetMetricsRequest, opts ...grpc.CallOption) (*milvuspb.GetMetricsResponse, error) {
 	out := new(milvuspb.GetMetricsResponse)
 	err := c.cc.Invoke(ctx, "/milvus.proto.index.IndexCoord/GetMetrics", in, out, opts...)
@@ -1033,6 +1085,7 @@ type IndexCoordServer interface {
 	GetIndexStates(context.Context, *GetIndexStatesRequest) (*GetIndexStatesResponse, error)
 	GetIndexFilePaths(context.Context, *GetIndexFilePathsRequest) (*GetIndexFilePathsResponse, error)
 	DropIndex(context.Context, *DropIndexRequest) (*commonpb.Status, error)
+	RemoveIndex(context.Context, *RemoveIndexRequest) (*commonpb.Status, error)
 	// https://wiki.lfaidata.foundation/display/MIL/MEP+8+--+Add+metrics+for+proxy
 	GetMetrics(context.Context, *milvuspb.GetMetricsRequest) (*milvuspb.GetMetricsResponse, error)
 }
@@ -1062,6 +1115,9 @@ func (*UnimplementedIndexCoordServer) GetIndexFilePaths(ctx context.Context, req
 func (*UnimplementedIndexCoordServer) DropIndex(ctx context.Context, req *DropIndexRequest) (*commonpb.Status, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method DropIndex not implemented")
 }
+func (*UnimplementedIndexCoordServer) RemoveIndex(ctx context.Context, req *RemoveIndexRequest) (*commonpb.Status, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method RemoveIndex not implemented")
+}
 func (*UnimplementedIndexCoordServer) GetMetrics(ctx context.Context, req *milvuspb.GetMetricsRequest) (*milvuspb.GetMetricsResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method GetMetrics not implemented")
 }
@@ -1196,6 +1252,24 @@ func _IndexCoord_DropIndex_Handler(srv interface{}, ctx context.Context, dec fun
 	return interceptor(ctx, in, info, handler)
 }
 
+func _IndexCoord_RemoveIndex_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(RemoveIndexRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(IndexCoordServer).RemoveIndex(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/milvus.proto.index.IndexCoord/RemoveIndex",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(IndexCoordServer).RemoveIndex(ctx, req.(*RemoveIndexRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 func _IndexCoord_GetMetrics_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
 	in := new(milvuspb.GetMetricsRequest)
 	if err := dec(in); err != nil {
@@ -1246,6 +1320,10 @@ var _IndexCoord_serviceDesc = grpc.ServiceDesc{
 			MethodName: "DropIndex",
 			Handler:    _IndexCoord_DropIndex_Handler,
 		},
+		{
+			MethodName: "RemoveIndex",
+			Handler:    _IndexCoord_RemoveIndex_Handler,
+		},
 		{
 			MethodName: "GetMetrics",
 			Handler:    _IndexCoord_GetMetrics_Handler,

internal/proxy/index_coord_mock_test.go

@@ -133,6 +133,13 @@ func (coord *IndexCoordMock) DropIndex(ctx context.Context, req *indexpb.DropInd
 	}, nil
 }
 
+func (coord *IndexCoordMock) RemoveIndex(ctx context.Context, req *indexpb.RemoveIndexRequest) (*commonpb.Status, error) {
+	return &commonpb.Status{
+		ErrorCode: commonpb.ErrorCode_Success,
+		Reason:    "",
+	}, nil
+}
+
 func (coord *IndexCoordMock) GetIndexStates(ctx context.Context, req *indexpb.GetIndexStatesRequest) (*indexpb.GetIndexStatesResponse, error) {
 	return &indexpb.GetIndexStatesResponse{
 		Status: &commonpb.Status{

internal/rootcoord/meta_table.go

@@ -429,7 +429,6 @@ func (mt *MetaTable) GetCollectionIDByName(cName string) (typeutil.UniqueID, err
 func (mt *MetaTable) GetCollectionNameByID(collectionID typeutil.UniqueID) (string, error) {
 	mt.ddLock.RLock()
 	defer mt.ddLock.RUnlock()
-	log.Info("xxxxxxxxx", zap.Any("collID2Meta", mt.collID2Meta))
 	col, ok := mt.collID2Meta[collectionID]
 	if !ok {
 		return "", fmt.Errorf("can't find collection id : %d", collectionID)
@@ -794,23 +793,13 @@ func (mt *MetaTable) DeletePartition(collID typeutil.UniqueID, partitionName str
 	return partID, nil
 }
 
-// AddIndex add index
+// AddIndex add index; before calling this function, you must check whether indexing is required
 func (mt *MetaTable) AddIndex(segIdxInfo *pb.SegmentIndexInfo) error {
 	mt.ddLock.Lock()
 	defer mt.ddLock.Unlock()
 
-	collMeta, ok := mt.collID2Meta[segIdxInfo.CollectionID]
-	if !ok {
-		return fmt.Errorf("collection id = %d not found", segIdxInfo.CollectionID)
-	}
-	exist := false
-	for _, fidx := range collMeta.FieldIndexes {
-		if fidx.IndexID == segIdxInfo.IndexID {
-			exist = true
-			break
-		}
-	}
-	if !exist {
+	if idxInfo, ok := mt.indexID2Meta[segIdxInfo.IndexID]; !ok || idxInfo.GetDeleted() {
+		log.Error("index id not found or has been deleted", zap.Int64("indexID", segIdxInfo.IndexID))
 		return fmt.Errorf("index id = %d not found", segIdxInfo.IndexID)
 	}
 
@@ -856,7 +845,70 @@ func (mt *MetaTable) AddIndex(segIdxInfo *pb.SegmentIndexInfo) error {
 	return nil
 }
 
+func (mt *MetaTable) MarkIndexDeleted(collName, fieldName, indexName string) error {
+	mt.ddLock.Lock()
+	defer mt.ddLock.Unlock()
+
+	collMeta, err := mt.unlockGetCollectionInfo(collName)
+	if err != nil {
+		log.Error("get collection meta failed", zap.String("collName", collName), zap.Error(err))
+		return fmt.Errorf("collection name  = %s not has meta", collName)
+	}
+	fieldSch, err := mt.unlockGetFieldSchema(collName, fieldName)
+	if err != nil {
+		return err
+	}
+
+	var clonedIndex *pb.IndexInfo
+	var dropIdxID typeutil.UniqueID
+	for _, info := range collMeta.FieldIndexes {
+		if info.FiledID != fieldSch.FieldID {
+			continue
+		}
+		idxMeta, ok := mt.indexID2Meta[info.IndexID]
+		if !ok {
+			errMsg := fmt.Errorf("index not has meta with ID = %d", info.IndexID)
+			log.Error("index id not has meta", zap.Int64("index id", info.IndexID))
+			return errMsg
+		}
+		if idxMeta.IndexName != indexName {
+			continue
+		}
+		dropIdxID = info.IndexID
+		clonedIndex = proto.Clone(&idxMeta).(*pb.IndexInfo)
+		clonedIndex.Deleted = true
+		break
+	}
+
+	if dropIdxID == 0 {
+		log.Warn("index not found", zap.String("collName", collName), zap.String("fieldName", fieldName),
+			zap.String("indexName", indexName))
+		return nil
+	}
+	log.Info("MarkIndexDeleted", zap.String("collName", collName), zap.String("fieldName", fieldName),
+		zap.String("indexName", indexName), zap.Int64("dropIndexID", dropIdxID))
+
+	k := fmt.Sprintf("%s/%d/%d", IndexMetaPrefix, collMeta.ID, dropIdxID)
+	v, err := proto.Marshal(clonedIndex)
+	if err != nil {
+		log.Error("MetaTable MarkIndexDeleted Marshal idxInfo fail",
+			zap.String("key", k), zap.Error(err))
+		return err
+	}
+
+	err = mt.txn.Save(k, string(v))
+	if err != nil {
+		log.Error("MetaTable MarkIndexDeleted txn MultiSave failed", zap.Error(err))
+		return err
+	}
+
+	// update meta cache
+	mt.indexID2Meta[dropIdxID] = *clonedIndex
+	return nil
+}
+
 // DropIndex drop index
+// Deprecated, only ut are used.
 func (mt *MetaTable) DropIndex(collName, fieldName, indexName string) (typeutil.UniqueID, bool, error) {
 	mt.ddLock.Lock()
 	defer mt.ddLock.Unlock()
@@ -884,15 +936,11 @@ func (mt *MetaTable) DropIndex(collName, fieldName, indexName string) (typeutil.
 			continue
 		}
 		idxMeta, ok := mt.indexID2Meta[info.IndexID]
-		if !ok {
+		if !ok || idxMeta.GetDeleted() || idxMeta.IndexName != indexName {
 			fieldIdxInfo = append(fieldIdxInfo, info)
 			log.Warn("index id not has meta", zap.Int64("index id", info.IndexID))
 			continue
 		}
-		if idxMeta.IndexName != indexName {
-			fieldIdxInfo = append(fieldIdxInfo, info)
-			continue
-		}
 		dropIdxID = info.IndexID
 		fieldIdxInfo = append(fieldIdxInfo, collMeta.FieldIndexes[i+1:]...)
 		break
@@ -973,6 +1021,161 @@ func (mt *MetaTable) GetInitBuildIDs(collName, indexName string) ([]UniqueID, er
 	return initBuildIDs, nil
 }
 
+func (mt *MetaTable) GetBuildIDsBySegIDs(segIDs []UniqueID) []UniqueID {
+	mt.ddLock.RLock()
+	defer mt.ddLock.RUnlock()
+
+	buildIDs := make([]UniqueID, 0)
+	for _, segID := range segIDs {
+		if idxID2segIdx, ok := mt.segID2IndexMeta[segID]; ok {
+			for _, segIndex := range idxID2segIdx {
+				buildIDs = append(buildIDs, segIndex.BuildID)
+			}
+		}
+	}
+	return buildIDs
+}
+
+func (mt *MetaTable) AlignSegmentsMeta(collID, partID UniqueID, segIDs map[UniqueID]struct{}) ([]UniqueID, []UniqueID) {
+	mt.ddLock.Lock()
+	defer mt.ddLock.Unlock()
+
+	allIndexID := make([]UniqueID, 0)
+	if collMeta, ok := mt.collID2Meta[collID]; ok {
+		for _, fieldIndex := range collMeta.FieldIndexes {
+			allIndexID = append(allIndexID, fieldIndex.IndexID)
+		}
+	}
+
+	recycledSegIDs := make([]UniqueID, 0)
+	recycledBuildIDs := make([]UniqueID, 0)
+	if segMap, ok := mt.partID2SegID[partID]; ok {
+		for segID := range segMap {
+			if _, ok := segIDs[segID]; !ok {
+				recycledSegIDs = append(recycledSegIDs, segID)
+			}
+			if idxID2segIndex, ok := mt.segID2IndexMeta[segID]; ok {
+				for _, segIndex := range idxID2segIndex {
+					recycledBuildIDs = append(recycledBuildIDs, segIndex.BuildID)
+				}
+			}
+		}
+	}
+
+	return recycledSegIDs, recycledBuildIDs
+}
+
+func (mt *MetaTable) RemoveSegments(collID, partID UniqueID, segIDs []UniqueID) error {
+	mt.ddLock.Lock()
+	defer mt.ddLock.Unlock()
+
+	log.Info("RootCoord MetaTable remove segments", zap.Int64("collID", collID), zap.Int64("partID", partID),
+		zap.Int64s("segIDs", segIDs))
+	allIndexID := make([]UniqueID, 0)
+	if collMeta, ok := mt.collID2Meta[collID]; ok {
+		for _, fieldIndex := range collMeta.FieldIndexes {
+			allIndexID = append(allIndexID, fieldIndex.IndexID)
+		}
+	}
+
+	for _, segID := range segIDs {
+		delMeta := make([]string, 0)
+		for _, indexID := range allIndexID {
+			delMeta = append(delMeta, fmt.Sprintf("%s/%d/%d/%d/%d", SegmentIndexMetaPrefix, collID, indexID, partID, segID))
+		}
+		if err := mt.txn.MultiRemove(delMeta); err != nil {
+			log.Error("remove redundant segment failed, wait to retry", zap.Int64("collID", collID), zap.Int64("part", partID),
+				zap.Int64("segID", segID), zap.Error(err))
+			return err
+		}
+		delete(mt.partID2SegID[partID], segID)
+		delete(mt.segID2IndexMeta, segID)
+	}
+
+	return nil
+}
+
+func (mt *MetaTable) GetDroppedIndex() map[UniqueID][]*pb.FieldIndexInfo {
+	mt.ddLock.Lock()
+	defer mt.ddLock.Unlock()
+
+	droppedIndex := make(map[UniqueID][]*pb.FieldIndexInfo)
+	for collID, meta := range mt.collID2Meta {
+		for _, fieldIndex := range meta.FieldIndexes {
+			if indexMeta, ok := mt.indexID2Meta[fieldIndex.IndexID]; ok && indexMeta.Deleted {
+				droppedIndex[collID] = append(droppedIndex[collID], proto.Clone(fieldIndex).(*pb.FieldIndexInfo))
+			}
+		}
+	}
+	return droppedIndex
+}
+
+// RecycleDroppedIndex remove the meta about index which is deleted.
+func (mt *MetaTable) RecycleDroppedIndex() error {
+	mt.ddLock.Lock()
+	defer mt.ddLock.Unlock()
+
+	for collID, collMeta := range mt.collID2Meta {
+		meta := collMeta
+		fieldIndexes := make([]*pb.FieldIndexInfo, 0)
+		delMeta := make([]string, 0)
+		deletedIndexIDs := make(map[UniqueID]struct{})
+		for _, fieldIndex := range meta.FieldIndexes {
+			// Prevent the number of transaction operations from exceeding the etcd limit (128), where a maximum of 100 are processed each time
+			if len(delMeta) >= 100 {
+				break
+			}
+			if idxInfo, ok := mt.indexID2Meta[fieldIndex.IndexID]; !ok || idxInfo.GetDeleted() {
+				deletedIndexIDs[fieldIndex.IndexID] = struct{}{}
+				delMeta = append(delMeta, fmt.Sprintf("%s/%d/%d", IndexMetaPrefix, collID, fieldIndex.IndexID))
+				delMeta = append(delMeta, fmt.Sprintf("%s/%d/%d", SegmentIndexMetaPrefix, collID, fieldIndex.IndexID))
+				continue
+			}
+			fieldIndexes = append(fieldIndexes, fieldIndex)
+		}
+		// node index is deleted
+		if len(fieldIndexes) == len(meta.FieldIndexes) {
+			continue
+		}
+		clonedCollMeta := proto.Clone(&meta).(*pb.CollectionInfo)
+		clonedCollMeta.FieldIndexes = fieldIndexes
+
+		saveMeta := make(map[string]string)
+		k := path.Join(CollectionMetaPrefix, strconv.FormatInt(collID, 10))
+		v, err := proto.Marshal(clonedCollMeta)
+		if err != nil {
+			log.Error("MetaTable RecycleDroppedIndex Marshal collMeta failed",
+				zap.String("key", k), zap.Error(err))
+			return err
+		}
+		saveMeta[k] = string(v)
+
+		if err = mt.txn.MultiSaveAndRemoveWithPrefix(saveMeta, delMeta); err != nil {
+			log.Error("MetaTable RecycleDroppedIndex MultiSaveAndRemoveWithPrefix failed", zap.Error(err))
+			return err
+		}
+		mt.collID2Meta[collID] = *clonedCollMeta
+		for indexID := range deletedIndexIDs {
+			delete(mt.indexID2Meta, indexID)
+		}
+		// update segID2IndexMeta
+		for _, partID := range meta.PartitionIDs {
+			if segIDMap, ok := mt.partID2SegID[partID]; ok {
+				for segID := range segIDMap {
+					if segIndexInfos, ok := mt.segID2IndexMeta[segID]; ok {
+						for indexID := range segIndexInfos {
+							if _, ok := deletedIndexIDs[indexID]; ok {
+								delete(mt.segID2IndexMeta[segID], indexID)
+							}
+						}
+					}
+				}
+			}
+		}
+	}
+	return nil
+}
+
 // GetSegmentIndexInfoByID return segment index info by segment id
 func (mt *MetaTable) GetSegmentIndexInfoByID(segID typeutil.UniqueID, fieldID int64, idxName string) (pb.SegmentIndexInfo, error) {
 	mt.ddLock.RLock()
@@ -995,20 +1198,14 @@ func (mt *MetaTable) GetSegmentIndexInfoByID(segID typeutil.UniqueID, fieldID in
 	if fieldID == -1 && idxName == "" { // return default index
 		for _, seg := range segIdxMap {
 			info, ok := mt.indexID2Meta[seg.IndexID]
-			if ok && info.IndexName == Params.CommonCfg.DefaultIndexName {
+			if ok && !info.GetDeleted() && info.IndexName == Params.CommonCfg.DefaultIndexName {
 				return seg, nil
 			}
 		}
 	} else {
 		for idxID, seg := range segIdxMap {
 			idxMeta, ok := mt.indexID2Meta[idxID]
-			if ok {
-				if idxMeta.IndexName != idxName {
-					continue
-				}
-				if seg.FieldID != fieldID {
-					continue
-				}
+			if ok && !idxMeta.GetDeleted() && idxMeta.IndexName == idxName && seg.FieldID == fieldID {
 				return seg, nil
 			}
 		}
@@ -1075,7 +1272,7 @@ func (mt *MetaTable) unlockIsSegmentIndexed(segID typeutil.UniqueID, fieldSchema
 			continue
 		}
 		idxMeta, ok := mt.indexID2Meta[idxID]
-		if !ok {
+		if !ok || idxMeta.GetDeleted() {
 			continue
 		}
 		if EqualKeyPairArray(indexParams, idxMeta.IndexParams) {
@@ -1105,6 +1302,9 @@ func (mt *MetaTable) checkFieldCanBeIndexed(collMeta pb.CollectionInfo, fieldSch
 	for _, f := range collMeta.FieldIndexes {
 		if f.GetFiledID() == fieldSchema.GetFieldID() {
 			if info, ok := mt.indexID2Meta[f.GetIndexID()]; ok {
+				if info.GetDeleted() {
+					continue
+				}
 				if idxInfo.GetIndexName() != info.GetIndexName() {
 					return fmt.Errorf(
 						"creating multiple indexes on same field is not supported, "+
@@ -1128,7 +1328,7 @@ func (mt *MetaTable) checkFieldCanBeIndexed(collMeta pb.CollectionInfo, fieldSch
 
 func (mt *MetaTable) checkFieldIndexDuplicate(collMeta pb.CollectionInfo, fieldSchema schemapb.FieldSchema, idxInfo *pb.IndexInfo) (duplicate bool, err error) {
 	for _, f := range collMeta.FieldIndexes {
-		if info, ok := mt.indexID2Meta[f.IndexID]; ok {
+		if info, ok := mt.indexID2Meta[f.IndexID]; ok && !info.GetDeleted() {
 			if info.IndexName == idxInfo.IndexName {
 				// the index name must be different for different indexes
 				if f.FiledID != fieldSchema.FieldID || !EqualKeyPairArray(info.IndexParams, idxInfo.IndexParams) {
@@ -1229,6 +1429,7 @@ func (mt *MetaTable) GetNotIndexedSegments(collName string, fieldName string, id
 }
 
 // GetIndexByName return index info by index name
+// TODO: IndexName is unique on collection, should return (pb.CollectionInfo, pb.IndexInfo, error)
 func (mt *MetaTable) GetIndexByName(collName, indexName string) (pb.CollectionInfo, []pb.IndexInfo, error) {
 	mt.ddLock.RLock()
 	defer mt.ddLock.RUnlock()
@@ -1251,6 +1452,9 @@ func (mt *MetaTable) GetIndexByName(collName, indexName string) (pb.CollectionIn
 		if !ok {
 			return pb.CollectionInfo{}, nil, fmt.Errorf("index id = %d not found", idx.IndexID)
 		}
+		if idxInfo.GetDeleted() {
+			continue
+		}
 		if indexName == "" || idxInfo.IndexName == indexName {
 			rstIndex = append(rstIndex, idxInfo)
 		}
@@ -1264,12 +1468,24 @@ func (mt *MetaTable) GetIndexByID(indexID typeutil.UniqueID) (*pb.IndexInfo, err
 	defer mt.ddLock.RUnlock()
 
 	indexInfo, ok := mt.indexID2Meta[indexID]
-	if !ok {
+	if !ok || indexInfo.GetDeleted() {
 		return nil, fmt.Errorf("cannot find index, id = %d", indexID)
 	}
 	return &indexInfo, nil
 }
 
+func (mt *MetaTable) dupCollectionMeta() map[typeutil.UniqueID]pb.CollectionInfo {
+	mt.ddLock.RLock()
+	defer mt.ddLock.RUnlock()
+
+	collID2Meta := map[typeutil.UniqueID]pb.CollectionInfo{}
+	for k, v := range mt.collID2Meta {
+		v := v
+		collID2Meta[k] = *proto.Clone(&v).(*pb.CollectionInfo)
+	}
+	return collID2Meta
+}
+
 func (mt *MetaTable) dupMeta() (
 	map[typeutil.UniqueID]pb.CollectionInfo,
 	map[typeutil.UniqueID]map[typeutil.UniqueID]pb.SegmentIndexInfo,

internal/rootcoord/meta_table_test.go

@@ -75,6 +75,7 @@ type mockTestTxnKV struct {
 	multiSave                    func(kvs map[string]string) error
 	multiSaveAndRemoveWithPrefix func(saves map[string]string, removals []string) error
 	remove                       func(key string) error
+	multiRemove                  func(keys []string) error
 }
 
 func (m *mockTestTxnKV) LoadWithPrefix(key string) ([]string, []string, error) {
@@ -97,6 +98,10 @@ func (m *mockTestTxnKV) Remove(key string) error {
 	return m.remove(key)
 }
 
+func (m *mockTestTxnKV) MultiRemove(keys []string) error {
+	return m.multiRemove(keys)
+}
+
 func Test_MockKV(t *testing.T) {
 	k1 := &mockTestKV{}
 	kt := &mockTestTxnKV{}
@@ -799,7 +804,7 @@ func TestMetaTable(t *testing.T) {
 		mt.collID2Meta = make(map[int64]pb.CollectionInfo)
 		err = mt.AddIndex(&segIdxInfo)
 		assert.NotNil(t, err)
-		assert.EqualError(t, err, fmt.Sprintf("collection id = %d not found", collInfo.ID))
+		assert.EqualError(t, err, fmt.Sprintf("index id = %d not found", segIdxInfo.IndexID))
 
 		err = mt.reloadFromKV()
 		assert.Nil(t, err)
@@ -1588,3 +1593,216 @@ func TestMetaTable_GetInitBuildIDs(t *testing.T) {
 		assert.Equal(t, 1, len(buildIDs))
 	})
 }
+
+func TestMetaTable_GetDroppedIndex(t *testing.T) {
+	mt := &MetaTable{
+		collID2Meta: map[typeutil.UniqueID]pb.CollectionInfo{
+			1: {
+				FieldIndexes: []*pb.FieldIndexInfo{
+					{
+						FiledID: 1,
+						IndexID: 1,
+					},
+					{
+						FiledID: 2,
+						IndexID: 2,
+					},
+					{
+						FiledID: 3,
+						IndexID: 3,
+					},
+				},
+			},
+		},
+		indexID2Meta: map[typeutil.UniqueID]pb.IndexInfo{
+			1: {
+				IndexName: "GetInitBuildID-Index-1",
+				IndexID:   1,
+				Deleted:   true,
+			},
+			2: {
+				IndexName: "GetInitBuildID-Index-2",
+				IndexID:   2,
+				Deleted:   false,
+			},
+		},
+	}
+
+	droppedIndexID := mt.GetDroppedIndex()
+	indexInfo, ok := droppedIndexID[1]
+	assert.True(t, ok)
+	assert.Equal(t, 1, len(indexInfo))
+}
+
+func TestMetaTable_AlignSegmentsMeta(t *testing.T) {
+	var (
+		indexName = "GetDroppedIndex-Index"
+		collID    = UniqueID(1)
+		partID    = UniqueID(10)
+		indexID   = UniqueID(1000)
+	)
+	mt := &MetaTable{
+		txn: &mockTestTxnKV{
+			multiRemove: func(keys []string) error {
+				return nil
+			},
+		},
+		collID2Meta: map[typeutil.UniqueID]pb.CollectionInfo{
+			collID: {
+				FieldIndexes: []*pb.FieldIndexInfo{
+					{
+						FiledID: 1,
+						IndexID: 1,
+					},
+				},
+			},
+		},
+		partID2SegID: map[typeutil.UniqueID]map[typeutil.UniqueID]bool{
+			partID: {
+				100: true,
+				101: true,
+				102: true,
+			},
+		},
+		indexID2Meta: map[typeutil.UniqueID]pb.IndexInfo{
+			indexID: {
+				IndexName: indexName,
+				IndexID:   1,
+				Deleted:   true,
+			},
+		},
+	}
+	t.Run("success", func(t *testing.T) {
+		mt.AlignSegmentsMeta(collID, partID, map[UniqueID]struct{}{101: {}, 102: {}, 103: {}})
+	})
+
+	t.Run("txn error", func(t *testing.T) {
+		txn := &mockTestTxnKV{
+			multiRemove: func(keys []string) error {
+				return fmt.Errorf("error occurred")
+			},
+		}
+		mt.txn = txn
+		mt.AlignSegmentsMeta(collID, partID, map[UniqueID]struct{}{103: {}, 104: {}, 105: {}})
+	})
+}
+
+func TestMetaTable_MarkIndexDeleted(t *testing.T) {
+	var (
+		collName  = "MarkIndexDeleted-Coll"
+		fieldName = "MarkIndexDeleted-Field"
+		indexName = "MarkIndexDeleted-Index"
+		collID    = UniqueID(1)
+		partID    = UniqueID(10)
+		fieldID   = UniqueID(100)
+		indexID   = UniqueID(1000)
+	)
+	mt := &MetaTable{
+		txn: &mockTestTxnKV{
+			multiRemove: func(keys []string) error {
+				return nil
+			},
+			save: func(key, value string) error {
+				return nil
+			},
+		},
+		collID2Meta: map[typeutil.UniqueID]pb.CollectionInfo{
+			collID: {
+				FieldIndexes: []*pb.FieldIndexInfo{
+					{
+						FiledID: 101,
+						IndexID: 1001,
+					},
+				},
+				Schema: &schemapb.CollectionSchema{
+					Fields: []*schemapb.FieldSchema{
+						{
+							FieldID: fieldID,
+							Name:    fieldName,
+						},
+					},
+				},
+			},
+		},
+		collName2ID: map[string]typeutil.UniqueID{
+			collName: collID,
+		},
+		partID2SegID: map[typeutil.UniqueID]map[typeutil.UniqueID]bool{
+			partID: {
+				100: true,
+				101: true,
+				102: true,
+			},
+		},
+		indexID2Meta: map[typeutil.UniqueID]pb.IndexInfo{
+			1001: {
+				IndexName: indexName,
+				IndexID:   indexID,
+				Deleted:   true,
+			},
+		},
+	}
+
+	t.Run("get collection meta failed", func(t *testing.T) {
+		err := mt.MarkIndexDeleted("collName", fieldName, indexName)
+		assert.Error(t, err)
+	})
+
+	t.Run("get field meta failed", func(t *testing.T) {
+		err := mt.MarkIndexDeleted(collName, "fieldName", indexName)
+		assert.Error(t, err)
+
+		err = mt.MarkIndexDeleted(collName, fieldName, indexName)
+		assert.NoError(t, err)
+	})
+
+	t.Run("indexMeta error", func(t *testing.T) {
+		collMeta := pb.CollectionInfo{
+			FieldIndexes: []*pb.FieldIndexInfo{
+				{
+					FiledID: fieldID,
+					IndexID: indexID,
+				},
+			},
+			Schema: &schemapb.CollectionSchema{
+				Fields: []*schemapb.FieldSchema{
+					{
+						FieldID: fieldID,
+						Name:    fieldName,
+					},
+				},
+			},
+		}
+		mt.collID2Meta[collID] = collMeta
+
+		err := mt.MarkIndexDeleted(collName, fieldName, indexName)
+		assert.Error(t, err)
+
+		mt.indexID2Meta[indexID] = pb.IndexInfo{
+			IndexName: "indexName",
+			IndexID:   indexID,
+		}
+
+		err = mt.MarkIndexDeleted(collName, fieldName, indexName)
+		assert.NoError(t, err)
+
+		mt.indexID2Meta[indexID] = pb.IndexInfo{
+			IndexName: indexName,
+			IndexID:   indexID,
+		}
+
+		err = mt.MarkIndexDeleted(collName, fieldName, indexName)
+		assert.NoError(t, err)
+	})
+
+	t.Run("txn save failed", func(t *testing.T) {
+		txn := &mockTestTxnKV{
+			save: func(key, value string) error {
+				return fmt.Errorf("error occurred")
+			},
+		}
+		mt.txn = txn
+		err := mt.MarkIndexDeleted(collName, fieldName, indexName)
+		assert.Error(t, err)
+	})
+}

internal/rootcoord/root_coord.go

@@ -135,6 +135,7 @@ type Core struct {
 	//call index builder's client to build index, return build id or get index state.
 	CallBuildIndexService     func(ctx context.Context, segID UniqueID, binlog []string, field *schemapb.FieldSchema, idxInfo *etcdpb.IndexInfo, numRows int64) (typeutil.UniqueID, error)
 	CallDropIndexService      func(ctx context.Context, indexID typeutil.UniqueID) error
+	CallRemoveIndexService    func(ctx context.Context, buildIDs []UniqueID) error
 	CallGetIndexStatesService func(ctx context.Context, IndexBuildIDs []int64) ([]*indexpb.IndexInfo, error)
 
 	NewProxyClient func(sess *sessionutil.Session) (types.Proxy, error)
@@ -281,6 +282,9 @@ func (c *Core) checkInit() error {
 	if c.CallDropIndexService == nil {
 		return fmt.Errorf("callDropIndexService is nil")
 	}
+	if c.CallRemoveIndexService == nil {
+		return fmt.Errorf("callDropIndexService is nil")
+	}
 	if c.CallWatchChannels == nil {
 		return fmt.Errorf("callWatchChannels is nil")
 	}
@@ -369,84 +373,145 @@ func (c *Core) checkFlushedSegmentsLoop() {
 	}
 }
 
+func (c *Core) recycleDroppedIndex() {
+	defer c.wg.Done()
+	ticker := time.NewTicker(3 * time.Second)
+
+	for {
+		select {
+		case <-c.ctx.Done():
+			return
+		case <-ticker.C:
+			droppedIndex := c.MetaTable.GetDroppedIndex()
+			for collID, fieldIndexes := range droppedIndex {
+				for _, fieldIndex := range fieldIndexes {
+					indexID := fieldIndex.GetIndexID()
+					fieldID := fieldIndex.GetFiledID()
+					if err := c.CallDropIndexService(c.ctx, indexID); err != nil {
+						log.Warn("Notify IndexCoord to drop index failed, wait to retry", zap.Int64("collID", collID),
+							zap.Int64("fieldID", fieldID), zap.Int64("indexID", indexID))
+					}
+				}
+			}
+			err := c.MetaTable.RecycleDroppedIndex()
+			if err != nil {
+				log.Warn("Remove index meta failed, wait to retry", zap.Error(err))
+			}
+		}
+	}
+}
+
+func (c *Core) createIndexForSegment(ctx context.Context, collID, partID, segID UniqueID, numRows int64, binlogs []*datapb.FieldBinlog) error {
+	collID2Meta, _, indexID2Meta := c.MetaTable.dupMeta()
+	collMeta, ok := collID2Meta[collID]
+	if !ok {
+		log.Error("collection meta is not exist", zap.Int64("collID", collID))
+		return fmt.Errorf("collection meta is not exist with ID = %d", collID)
+	}
+	if len(collMeta.FieldIndexes) == 0 {
+		log.Info("collection has no index, no need to build index on segment", zap.Int64("collID", collID),
+			zap.Int64("segID", segID))
+		return nil
+	}
+	for _, fieldIndex := range collMeta.FieldIndexes {
+		indexMeta, ok := indexID2Meta[fieldIndex.IndexID]
+		if !ok {
+			log.Warn("index has no meta", zap.Int64("collID", collID), zap.Int64("indexID", fieldIndex.IndexID))
+			return fmt.Errorf("index has no meta with ID = %d in collection %d", fieldIndex.IndexID, collID)
+		}
+		if indexMeta.Deleted {
+			log.Info("index has been deleted, no need to build index on segment")
+			continue
+		}
+
+		field, err := GetFieldSchemaByID(&collMeta, fieldIndex.FiledID)
+		if err != nil {
+			log.Debug("GetFieldSchemaByID failed",
+				zap.Int64("collectionID", collID),
+				zap.Int64("fieldID", fieldIndex.FiledID))
+			return err
+		}
+		if c.MetaTable.IsSegmentIndexed(segID, field, indexMeta.IndexParams) {
+			continue
+		}
+
+		segIndexInfo := etcdpb.SegmentIndexInfo{
+			CollectionID: collMeta.ID,
+			PartitionID:  partID,
+			SegmentID:    segID,
+			FieldID:      fieldIndex.FiledID,
+			IndexID:      fieldIndex.IndexID,
+			EnableIndex:  false,
+			ByAutoFlush:  true,
+		}
+		buildID, err := c.BuildIndex(ctx, segID, numRows, binlogs, field, &indexMeta, false)
+		if err != nil {
+			log.Debug("build index failed",
+				zap.Int64("segmentID", segID),
+				zap.Int64("fieldID", field.FieldID),
+				zap.Int64("indexID", indexMeta.IndexID))
+			return err
+		}
+		// if buildID == 0, means it's no need to build index.
+		if buildID != 0 {
+			segIndexInfo.BuildID = buildID
+			segIndexInfo.EnableIndex = true
+		}
+
+		if err := c.MetaTable.AddIndex(&segIndexInfo); err != nil {
+			log.Error("Add index into meta table failed, need remove index with buildID",
+				zap.Int64("collectionID", collID), zap.Int64("indexID", fieldIndex.IndexID),
+				zap.Int64("buildID", buildID), zap.Error(err))
+			if err = retry.Do(ctx, func() error {
+				return c.CallRemoveIndexService(ctx, []UniqueID{buildID})
+			}); err != nil {
+				log.Error("remove index failed, need to be resolved manually", zap.Int64("collectionID", collID),
+					zap.Int64("indexID", fieldIndex.IndexID), zap.Int64("buildID", buildID), zap.Error(err))
+				return err
+			}
+			return err
+		}
+	}
+	return nil
+}
+
 func (c *Core) checkFlushedSegments(ctx context.Context) {
-	collID2Meta, segID2IndexMeta, indexID2Meta := c.MetaTable.dupMeta()
-	for _, collMeta := range collID2Meta {
+	collID2Meta := c.MetaTable.dupCollectionMeta()
+	for collID, collMeta := range collID2Meta {
 		if len(collMeta.FieldIndexes) == 0 {
 			continue
 		}
 		for _, partID := range collMeta.PartitionIDs {
-			ctx2, cancel2 := context.WithTimeout(ctx, 3*time.Minute)
-			segBinlogs, err := c.CallGetRecoveryInfoService(ctx2, collMeta.ID, partID)
+			segBinlogs, err := c.CallGetRecoveryInfoService(ctx, collMeta.ID, partID)
 			if err != nil {
 				log.Debug("failed to get flushed segments from dataCoord",
 					zap.Int64("collection ID", collMeta.GetID()),
 					zap.Int64("partition ID", partID),
 					zap.Error(err))
-				cancel2()
 				continue
 			}
+			segIDs := make(map[UniqueID]struct{})
 			for _, segBinlog := range segBinlogs {
-				segID := segBinlog.SegmentID
-				var indexInfos []*etcdpb.FieldIndexInfo
-				indexMeta, ok := segID2IndexMeta[segID]
-				if !ok {
-					indexInfos = append(indexInfos, collMeta.FieldIndexes...)
-				} else {
-					for _, idx := range collMeta.FieldIndexes {
-						if _, ok := indexMeta[idx.IndexID]; !ok {
-							indexInfos = append(indexInfos, idx)
-						}
-					}
-				}
-				for _, idxInfo := range indexInfos {
-					/* #nosec G601 */
-					field, err := GetFieldSchemaByID(&collMeta, idxInfo.FiledID)
+				segIDs[segBinlog.GetSegmentID()] = struct{}{}
+				err = c.createIndexForSegment(ctx, collID, partID, segBinlog.GetSegmentID(), segBinlog.GetNumOfRows(), segBinlog.GetFieldBinlogs())
 				if err != nil {
-						log.Debug("GetFieldSchemaByID",
-							zap.Any("collection_meta", collMeta),
-							zap.Int64("field id", idxInfo.FiledID))
+					log.Error("createIndexForSegment failed, wait to retry", zap.Int64("collID", collID),
+						zap.Int64("partID", partID), zap.Int64("segID", segBinlog.GetSegmentID()), zap.Error(err))
 					continue
 				}
-					indexMeta, ok := indexID2Meta[idxInfo.IndexID]
-					if !ok {
-						log.Debug("index meta does not exist", zap.Int64("index_id", idxInfo.IndexID))
+			}
+			recycledSegIDs, recycledBuildIDs := c.MetaTable.AlignSegmentsMeta(collID, partID, segIDs)
+			log.Info("there buildIDs should be remove index", zap.Int64s("buildIDs", recycledBuildIDs))
+			if err := c.CallRemoveIndexService(ctx, recycledBuildIDs); err != nil {
+				log.Error("CallRemoveIndexService remove indexes on segments failed",
+					zap.Int64s("need dropped buildIDs", recycledBuildIDs), zap.Error(err))
 				continue
 			}
-					info := etcdpb.SegmentIndexInfo{
-						CollectionID: collMeta.ID,
-						PartitionID:  partID,
-						SegmentID:    segID,
-						FieldID:      idxInfo.FiledID,
-						IndexID:      idxInfo.IndexID,
-						EnableIndex:  false,
-						ByAutoFlush:  true,
-					}
-					log.Debug("building index by background checker",
-						zap.Int64("segment_id", segID),
-						zap.Int64("index_id", indexMeta.IndexID),
-						zap.Int64("collection_id", collMeta.ID))
-					info.BuildID, err = c.BuildIndex(ctx2, segID, segBinlog.GetNumOfRows(), segBinlog.GetFieldBinlogs(), field, &indexMeta, false)
-					if err != nil {
-						log.Debug("build index failed",
-							zap.Int64("segment_id", segID),
-							zap.Int64("field_id", field.FieldID),
-							zap.Int64("index_id", indexMeta.IndexID))
+			if err := c.MetaTable.RemoveSegments(collID, partID, recycledSegIDs); err != nil {
+				log.Warn("remove segments failed, wait to retry", zap.Int64("collID", collID), zap.Int64("partID", partID),
+					zap.Int64s("segIDs", recycledSegIDs), zap.Error(err))
 				continue
 			}
-					if info.BuildID != 0 {
-						info.EnableIndex = true
-					}
-					if err := c.MetaTable.AddIndex(&info); err != nil {
-						log.Debug("Add index into meta table failed",
-							zap.Int64("collection_id", collMeta.ID),
-							zap.Int64("index_id", info.IndexID),
-							zap.Int64("build_id", info.BuildID),
-							zap.Error(err))
-					}
-				}
-			}
-			cancel2()
 		}
 	}
 }
@@ -833,6 +898,27 @@ func (c *Core) SetIndexCoord(s types.IndexCoord) error {
 		}
 		return res.GetStates(), nil
 	}
+
+	c.CallRemoveIndexService = func(ctx context.Context, buildIDs []UniqueID) (retErr error) {
+		defer func() {
+			if err := recover(); err != nil {
+				retErr = fmt.Errorf("get index state from index service panic, msg = %v", err)
+			}
+		}()
+		<-initCh
+		status, err := s.RemoveIndex(ctx, &indexpb.RemoveIndexRequest{
+			BuildIDs: buildIDs,
+		})
+		if err != nil {
+			return err
+		}
+
+		if status.GetErrorCode() != commonpb.ErrorCode_Success {
+			return fmt.Errorf(status.Reason)
+		}
+
+		return nil
+	}
 	return nil
 }
 
@@ -1341,13 +1427,14 @@ func (c *Core) Start() error {
 			log.Fatal("RootCoord Start reSendDdMsg failed", zap.Error(err))
 			panic(err)
 		}
-		c.wg.Add(6)
+		c.wg.Add(7)
 		go c.startTimeTickLoop()
 		go c.tsLoop()
 		go c.chanTimeTick.startWatch(&c.wg)
 		go c.checkFlushedSegmentsLoop()
 		go c.importManager.expireOldTasksLoop(&c.wg, c.CallReleaseSegRefLock)
 		go c.importManager.sendOutTasksLoop(&c.wg)
+		go c.recycleDroppedIndex()
 		Params.RootCoordCfg.CreatedTime = time.Now()
 		Params.RootCoordCfg.UpdatedTime = time.Now()
 	})
@@ -2162,71 +2249,35 @@ func (c *Core) SegmentFlushCompleted(ctx context.Context, in *datapb.SegmentFlus
 	if in.Base.MsgType != commonpb.MsgType_SegmentFlushDone {
 		return failStatus(commonpb.ErrorCode_UnexpectedError, "invalid msg type "+commonpb.MsgType_name[int32(in.Base.MsgType)]), nil
 	}
-	segID := in.Segment.GetID()
-	log.Debug("SegmentFlushCompleted", zap.String("role", typeutil.RootCoordRole),
-		zap.Int64("collection id", in.Segment.CollectionID), zap.Int64("partition id", in.Segment.PartitionID),
-		zap.Int64("segment id", segID), zap.Int64("msgID", in.Base.MsgID))
 
-	coll, err := c.MetaTable.GetCollectionByID(in.Segment.CollectionID, 0)
+	log.Info("SegmentFlushCompleted received", zap.Int64("msgID", in.Base.MsgID), zap.Int64("collID", in.Segment.CollectionID),
+		zap.Int64("partID", in.Segment.PartitionID), zap.Int64("segID", in.Segment.ID), zap.Int64s("compactFrom", in.Segment.CompactionFrom))
+	err := c.createIndexForSegment(ctx, in.Segment.CollectionID, in.Segment.PartitionID, in.Segment.ID, in.Segment.NumOfRows, in.Segment.Binlogs)
 	if err != nil {
-		log.Error("GetCollectionByID failed", zap.String("role", typeutil.RootCoordRole),
-			zap.Int64("msgID", in.Base.MsgID), zap.Error(err))
-		return failStatus(commonpb.ErrorCode_UnexpectedError, "GetCollectionByID failed: "+err.Error()), nil
+		log.Error("createIndexForSegment", zap.Int64("msgID", in.Base.MsgID), zap.Int64("collID", in.Segment.CollectionID),
+			zap.Int64("partID", in.Segment.PartitionID), zap.Int64("segID", in.Segment.ID), zap.Error(err))
+		return failStatus(commonpb.ErrorCode_UnexpectedError, err.Error()), nil
 	}
 
-	if len(coll.FieldIndexes) == 0 {
-		log.Debug("no index params on collection", zap.String("role", typeutil.RootCoordRole),
-			zap.String("collection_name", coll.Schema.Name), zap.Int64("msgID", in.Base.MsgID))
-	}
-
-	for _, f := range coll.FieldIndexes {
-		fieldSch, err := GetFieldSchemaByID(coll, f.FiledID)
-		if err != nil {
-			log.Warn("field schema not found", zap.String("role", typeutil.RootCoordRole),
-				zap.String("collection_name", coll.Schema.Name), zap.Int64("field id", f.FiledID),
-				zap.Int64("msgID", in.Base.MsgID), zap.Error(err))
-			continue
-		}
-
-		idxInfo, err := c.MetaTable.GetIndexByID(f.IndexID)
-		if err != nil {
-			log.Warn("index not found", zap.String("role", typeutil.RootCoordRole),
-				zap.String("collection_name", coll.Schema.Name), zap.Int64("field id", f.FiledID),
-				zap.Int64("index id", f.IndexID), zap.Int64("msgID", in.Base.MsgID), zap.Error(err))
-			continue
-		}
-
-		info := etcdpb.SegmentIndexInfo{
-			CollectionID: in.Segment.CollectionID,
-			PartitionID:  in.Segment.PartitionID,
-			SegmentID:    segID,
-			FieldID:      fieldSch.FieldID,
-			IndexID:      idxInfo.IndexID,
-			EnableIndex:  false,
-			ByAutoFlush:  true,
-		}
-		info.BuildID, err = c.BuildIndex(ctx, segID, in.Segment.GetNumOfRows(), in.Segment.GetBinlogs(), fieldSch, idxInfo, true)
-		if err == nil && info.BuildID != 0 {
-			info.EnableIndex = true
-		} else {
-			log.Error("BuildIndex failed", zap.String("role", typeutil.RootCoordRole),
-				zap.String("collection_name", coll.Schema.Name), zap.Int64("field id", f.FiledID),
-				zap.Int64("index id", f.IndexID), zap.Int64("build id", info.BuildID),
-				zap.Int64("msgID", in.Base.MsgID), zap.Error(err))
-			continue
-		}
-		err = c.MetaTable.AddIndex(&info)
-		if err != nil {
-			log.Error("AddIndex failed", zap.String("role", typeutil.RootCoordRole),
-				zap.String("collection_name", coll.Schema.Name), zap.Int64("field id", f.FiledID),
-				zap.Int64("index id", f.IndexID), zap.Int64("msgID", in.Base.MsgID), zap.Error(err))
-			continue
+	buildIDs := c.MetaTable.GetBuildIDsBySegIDs(in.Segment.CompactionFrom)
+	if len(buildIDs) != 0 {
+		if err = c.CallRemoveIndexService(ctx, buildIDs); err != nil {
+			log.Error("CallRemoveIndexService failed", zap.Int64("msgID", in.Base.MsgID), zap.Int64("collID", in.Segment.CollectionID),
+				zap.Int64("partID", in.Segment.PartitionID), zap.Int64("segID", in.Segment.ID),
+				zap.Int64s("compactFrom", in.Segment.CompactionFrom), zap.Int64s("buildIDs", buildIDs), zap.Error(err))
+			return failStatus(commonpb.ErrorCode_UnexpectedError, err.Error()), nil
 		}
 	}
 
+	if err = c.MetaTable.RemoveSegments(in.Segment.CollectionID, in.Segment.PartitionID, in.Segment.CompactionFrom); err != nil {
+		log.Error("RemoveSegments failed", zap.Int64("msgID", in.Base.MsgID), zap.Int64("collID", in.Segment.CollectionID),
+			zap.Int64("partID", in.Segment.PartitionID), zap.Int64("segID", in.Segment.ID),
+			zap.Int64s("compactFrom", in.Segment.CompactionFrom), zap.Error(err))
+		return failStatus(commonpb.ErrorCode_UnexpectedError, err.Error()), nil
+	}
 	log.Debug("SegmentFlushCompleted success", zap.String("role", typeutil.RootCoordRole),
 		zap.Int64("collection id", in.Segment.CollectionID), zap.Int64("partition id", in.Segment.PartitionID),
-		zap.Int64("segment id", segID), zap.Int64("msgID", in.Base.MsgID))
+		zap.Int64("segment id", in.Segment.ID), zap.Int64("msgID", in.Base.MsgID))
 	return succStatus(), nil
 }
 

internal/rootcoord/root_coord_test.go

@@ -1722,10 +1722,16 @@ func TestRootCoord_Base(t *testing.T) {
 		assert.NoError(t, err)
 		assert.Equal(t, commonpb.ErrorCode_Success, rsp.ErrorCode)
 
+		for {
 			im.mutex.Lock()
-		assert.Equal(t, 1, len(im.idxDropID))
+			if len(im.idxDropID) == 1 {
 				assert.Equal(t, idx[0].IndexID, im.idxDropID[0])
 				im.mutex.Unlock()
+				break
+			}
+			im.mutex.Unlock()
+			time.Sleep(time.Second)
+		}
 
 		_, idx, err = core.MetaTable.GetIndexByName(collName, Params.CommonCfg.DefaultIndexName)
 		assert.NoError(t, err)
@@ -3040,6 +3046,12 @@ func TestCheckInit(t *testing.T) {
 	err = c.checkInit()
 	assert.Error(t, err)
 
+	c.CallRemoveIndexService = func(ctx context.Context, buildIDs []typeutil.UniqueID) error {
+		return nil
+	}
+	err = c.checkInit()
+	assert.Error(t, err)
+
 	c.NewProxyClient = func(*sessionutil.Session) (types.Proxy, error) {
 		return nil, nil
 	}

internal/rootcoord/task.go

@@ -919,12 +919,12 @@ func (t *DescribeSegmentsReqTask) Execute(ctx context.Context) error {
 					})
 			extraIndexInfo, err := t.core.MetaTable.GetIndexByID(indexID)
 			if err != nil {
-				log.Error("index not found in meta table",
+				log.Warn("index not found in meta table, maybe index has been deleted",
 					zap.Error(err),
 					zap.Int64("indexID", indexID),
 					zap.Int64("collection", collectionID),
 					zap.Int64("segment", segID))
-				return err
+				continue
 			}
 			t.Rsp.SegmentInfos[segID].ExtraIndexInfos[indexID] = extraIndexInfo
 		}
@@ -1072,11 +1072,10 @@ func (t *DropIndexReqTask) Execute(ctx context.Context) error {
 	if t.Type() != commonpb.MsgType_DropIndex {
 		return fmt.Errorf("drop index, msg type = %s", commonpb.MsgType_name[int32(t.Type())])
 	}
-	if err := t.core.RemoveIndex(ctx, t.Req.CollectionName, t.Req.IndexName); err != nil {
+	if err := t.core.MetaTable.MarkIndexDeleted(t.Req.CollectionName, t.Req.FieldName, t.Req.IndexName); err != nil {
 		return err
 	}
-	_, _, err := t.core.MetaTable.DropIndex(t.Req.CollectionName, t.Req.FieldName, t.Req.IndexName)
-	return err
+	return nil
 }
 
 // CreateAliasReqTask create alias request task

internal/rootcoord/task_test.go

@@ -76,7 +76,7 @@ func TestDescribeSegmentsReqTask_Execute(t *testing.T) {
 	}
 	assert.NoError(t, tsk.Execute(context.Background()))
 
-	// index not found in meta.
+	// index not found in meta. no return error
 	c.MetaTable = &MetaTable{
 		segID2IndexMeta: map[typeutil.UniqueID]map[typeutil.UniqueID]etcdpb.SegmentIndexInfo{
 			segID: {
@@ -92,7 +92,7 @@ func TestDescribeSegmentsReqTask_Execute(t *testing.T) {
 			},
 		},
 	}
-	assert.Error(t, tsk.Execute(context.Background()))
+	assert.NoError(t, tsk.Execute(context.Background()))
 
 	// success.
 	c.MetaTable = &MetaTable{

internal/types/types.go

@@ -351,6 +351,9 @@ type IndexCoord interface {
 
 	// GetMetrics gets the metrics about IndexCoord.
 	GetMetrics(ctx context.Context, req *milvuspb.GetMetricsRequest) (*milvuspb.GetMetricsResponse, error)
+
+	// RemoveIndex removes the index on specify segments.
+	RemoveIndex(ctx context.Context, req *indexpb.RemoveIndexRequest) (*commonpb.Status, error)
 }
 
 // IndexCoordComponent is used by grpc server of IndexCoord