enhance: [AddField] Broadcast schema change via WAL (#41373)

Related to #39718

Add Broadcast logic for collection schema change and notifies:
- Streamnode - Delegator
- Streamnode - Flush component
- QueryNodes via grpc

---------

Signed-off-by: Congqi Xia <congqi.xia@zilliz.com>

internal/core/src/segcore/Collection.cpp

@@ -64,4 +64,16 @@ Collection::parseIndexMeta(const void* index_proto, const int64_t length) {
     LOG_INFO("index meta info: {}", index_meta_->ToString());
 }
 
+void
+Collection::parse_schema(const void* schema_proto_blob, const int64_t length) {
+    Assert(schema_proto_blob != nullptr);
+
+    milvus::proto::schema::CollectionSchema collection_schema;
+    auto suc = collection_schema.ParseFromArray(schema_proto_blob, length);
+
+    AssertInfo(suc, "parse schema proto failed");
+
+    schema_ = Schema::ParseFrom(collection_schema);
+}
+
 }  // namespace milvus::segcore

internal/core/src/segcore/Collection.h

@@ -28,6 +28,9 @@ class Collection {
     void
     parseIndexMeta(const void* index_meta_proto_blob, const int64_t length);
 
+    void
+    parse_schema(const void* schema_proto_blob, const int64_t length);
+
  public:
     SchemaPtr&
     get_schema() {

internal/core/src/segcore/collection_c.cpp

@@ -9,6 +9,8 @@
 // is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 // or implied. See the License for the specific language governing permissions and limitations under the License
 
+#include <exception>
+#include "common/EasyAssert.h"
 #include "common/type_c.h"
 #ifdef __linux__
 #include <malloc.h>
@@ -32,6 +34,20 @@ NewCollection(const void* schema_proto_blob,
     }
 }
 
+CStatus
+UpdateSchema(CCollection collection,
+             const void* proto_blob,
+             const int64_t length) {
+    try {
+        auto col = static_cast<milvus::segcore::Collection*>(collection);
+
+        col->parse_schema(proto_blob, length);
+        return milvus::SuccessCStatus();
+    } catch (std::exception& e) {
+        return milvus::FailureCStatus(&e);
+    }
+}
+
 CStatus
 SetIndexMeta(CCollection collection,
              const void* proto_blob,

internal/core/src/segcore/collection_c.h

@@ -25,6 +25,11 @@ NewCollection(const void* schema_proto_blob,
               const int64_t length,
               CCollection* collection);
 
+CStatus
+UpdateSchema(CCollection collection,
+             const void* proto_blob,
+             const int64_t length);
+
 CStatus
 SetIndexMeta(CCollection collection,
              const void* proto_blob,

internal/core/unittest/test_c_api.cpp

@@ -30,7 +30,9 @@
 #include "index/IndexFactory.h"
 #include "knowhere/comp/index_param.h"
 #include "pb/plan.pb.h"
+#include "pb/schema.pb.h"
 #include "segcore/Collection.h"
+#include "segcore/collection_c.h"
 #include "segcore/reduce/Reduce.h"
 #include "segcore/reduce_c.h"
 #include "segcore/segment_c.h"
@@ -239,6 +241,71 @@ TEST(CApiTest, CollectionTest) {
     DeleteCollection(collection);
 }
 
+TEST(CApiTest, UpdateSchemaTest) {
+    std::string schema_string = generate_collection_schema<milvus::FloatVector>(
+        knowhere::metric::L2, DIM);
+    // CCollection
+    auto collection = NewCollection(schema_string.c_str());
+
+    // create updated schema with extra field
+    namespace schema = milvus::proto::schema;
+    schema::CollectionSchema collection_schema;
+    collection_schema.set_name("collection_test");
+
+    auto vec_field_schema = collection_schema.add_fields();
+    vec_field_schema->set_name("fakevec");
+    vec_field_schema->set_fieldid(100);
+    vec_field_schema->set_data_type(schema::DataType::FloatVector);
+    auto metric_type_param = vec_field_schema->add_index_params();
+    metric_type_param->set_key("metric_type");
+    metric_type_param->set_value(knowhere::metric::L2);
+    auto dim_param = vec_field_schema->add_type_params();
+    dim_param->set_key("dim");
+    dim_param->set_value(std::to_string(DIM));
+
+    auto other_field_schema = collection_schema.add_fields();
+    other_field_schema->set_name("counter");
+    other_field_schema->set_fieldid(101);
+    other_field_schema->set_data_type(schema::DataType::Int64);
+    other_field_schema->set_is_primary_key(true);
+
+    auto other_field_schema2 = collection_schema.add_fields();
+    other_field_schema2->set_name("doubleField");
+    other_field_schema2->set_fieldid(102);
+    other_field_schema2->set_data_type(schema::DataType::Double);
+
+    auto added_field = collection_schema.add_fields();
+    added_field->set_name("added_field");
+    added_field->set_fieldid(103);
+    added_field->set_data_type(schema::DataType::Int64);
+    added_field->set_nullable(true);
+
+    std::string updated_schema_string;
+    auto marshal = collection_schema.SerializeToString(&updated_schema_string);
+    ASSERT_TRUE(marshal);
+
+    // Call UpdateSchema CApi here
+    // UpdateSchema(CCollection, const void*, const int64_t)
+    auto status = UpdateSchema(collection,
+                               updated_schema_string.c_str(),
+                               updated_schema_string.length());
+    ASSERT_EQ(status.error_code, Success);
+
+    auto col = static_cast<milvus::segcore::Collection*>(collection);
+    auto updated_schema = col->get_schema();
+    auto add_field = updated_schema->operator[](FieldId(103));
+
+    ASSERT_EQ(add_field.get_name().get(), "added_field");
+
+    // Test failure case, no panicking with failure code
+    status = UpdateSchema(collection, nullptr, 0);
+    ASSERT_NE(status.error_code, Success);
+
+    DeleteCollection(collection);
+    // free error msg, which shall be responsible for go side to call C.free()
+    free(const_cast<char*>(status.error_msg));
+}
+
 TEST(CApiTest, LoadInfoTest) {
     auto load_info = std::make_shared<LoadFieldDataInfo>();
     auto c_load_info = reinterpret_cast<CLoadFieldDataInfo*>(load_info.get());
@@ -4231,7 +4298,6 @@ TEST(CApiTest, GrowingSegment_Load_Field_Data_Lack_Binlog_Rows) {
     DeleteSegment(segment);
 }
 
-
 TEST(CApiTest, DISABLED_SealedSegment_Load_Field_Data_Lack_Binlog_Rows) {
     double double_default_value = 20;
     auto schema = std::make_shared<Schema>();

internal/core/unittest/test_utils/DataGen.h

@@ -45,7 +45,6 @@
 #include "storage/Util.h"
 #include "milvus-storage/common/constants.h"
 
-
 using boost::algorithm::starts_with;
 
 namespace milvus::segcore {

internal/datanode/msghandlerimpl/msg_handler_impl.go

@@ -32,6 +32,7 @@ import (
 	"github.com/milvus-io/milvus/pkg/v2/log"
 	"github.com/milvus-io/milvus/pkg/v2/proto/internalpb"
 	"github.com/milvus-io/milvus/pkg/v2/streaming/util/message"
+	"github.com/milvus-io/milvus/pkg/v2/streaming/util/message/adaptor"
 	"github.com/milvus-io/milvus/pkg/v2/streaming/util/types"
 	"github.com/milvus-io/milvus/pkg/v2/util/funcutil"
 	"github.com/milvus-io/milvus/pkg/v2/util/merr"
@@ -89,6 +90,13 @@ func (m *msgHandlerImpl) HandleImport(ctx context.Context, vchannel string, impo
 	}, retry.AttemptAlways())
 }
 
+func (impl *msgHandlerImpl) HandleSchemaChange(ctx context.Context, vchannel string, msg *adaptor.SchemaChangeMessageBody) error {
+	return streaming.WAL().Broadcast().Ack(ctx, types.BroadcastAckRequest{
+		BroadcastID: msg.BroadcastID,
+		VChannel:    vchannel,
+	})
+}
+
 func NewMsgHandlerImpl(broker broker.Broker) *msgHandlerImpl {
 	return &msgHandlerImpl{
 		broker: broker,

internal/distributed/querynode/client/client.go

@@ -360,3 +360,14 @@ func (c *Client) DeleteBatch(ctx context.Context, req *querypb.DeleteBatchReques
 		return client.DeleteBatch(ctx, req)
 	})
 }
+
+func (c *Client) UpdateSchema(ctx context.Context, req *querypb.UpdateSchemaRequest, _ ...grpc.CallOption) (*commonpb.Status, error) {
+	req = typeutil.Clone(req)
+	commonpbutil.UpdateMsgBase(
+		req.GetBase(),
+		commonpbutil.FillMsgBaseFromClient(c.nodeID),
+	)
+	return wrapGrpcCall(ctx, c, func(client querypb.QueryNodeClient) (*commonpb.Status, error) {
+		return client.UpdateSchema(ctx, req)
+	})
+}

internal/distributed/querynode/service.go

@@ -394,3 +394,7 @@ func (s *Server) Delete(ctx context.Context, req *querypb.DeleteRequest) (*commo
 func (s *Server) DeleteBatch(ctx context.Context, req *querypb.DeleteBatchRequest) (*querypb.DeleteBatchResponse, error) {
 	return s.querynode.DeleteBatch(ctx, req)
 }
+
+func (s *Server) UpdateSchema(ctx context.Context, req *querypb.UpdateSchemaRequest) (*commonpb.Status, error) {
+	return s.querynode.UpdateSchema(ctx, req)
+}

internal/flushcommon/metacache/meta_cache.go

@@ -54,6 +54,8 @@ type MetaCache interface {
 	DetectMissingSegments(segments map[int64]struct{}) []int64
 	// UpdateSegmentView updates the segments BF from datacoord view.
 	UpdateSegmentView(partitionID int64, newSegments []*datapb.SyncSegmentInfo, newSegmentsBF []*pkoracle.BloomFilterSet, allSegments map[int64]struct{})
+	// UpdateSchema update the latest collection schema
+	UpdateSchema(updatedSchema *schemapb.CollectionSchema)
 }
 
 var _ MetaCache = (*metaCacheImpl)(nil)
@@ -316,3 +318,7 @@ func (c *metaCacheImpl) UpdateSegmentView(partitionID int64,
 		}
 	}
 }
+
+func (c *metaCacheImpl) UpdateSchema(updatedSchema *schemapb.CollectionSchema) {
+	c.schema = updatedSchema
+}

internal/flushcommon/metacache/mock_meta_cache.go

@@ -545,6 +545,39 @@ func (_c *MockMetaCache_Schema_Call) RunAndReturn(run func() *schemapb.Collectio
 	return _c
 }
 
+// UpdateSchema provides a mock function with given fields: updatedSchema
+func (_m *MockMetaCache) UpdateSchema(updatedSchema *schemapb.CollectionSchema) {
+	_m.Called(updatedSchema)
+}
+
+// MockMetaCache_UpdateSchema_Call is a *mock.Call that shadows Run/Return methods with type explicit version for method 'UpdateSchema'
+type MockMetaCache_UpdateSchema_Call struct {
+	*mock.Call
+}
+
+// UpdateSchema is a helper method to define mock.On call
+//   - updatedSchema *schemapb.CollectionSchema
+func (_e *MockMetaCache_Expecter) UpdateSchema(updatedSchema interface{}) *MockMetaCache_UpdateSchema_Call {
+	return &MockMetaCache_UpdateSchema_Call{Call: _e.mock.On("UpdateSchema", updatedSchema)}
+}
+
+func (_c *MockMetaCache_UpdateSchema_Call) Run(run func(updatedSchema *schemapb.CollectionSchema)) *MockMetaCache_UpdateSchema_Call {
+	_c.Call.Run(func(args mock.Arguments) {
+		run(args[0].(*schemapb.CollectionSchema))
+	})
+	return _c
+}
+
+func (_c *MockMetaCache_UpdateSchema_Call) Return() *MockMetaCache_UpdateSchema_Call {
+	_c.Call.Return()
+	return _c
+}
+
+func (_c *MockMetaCache_UpdateSchema_Call) RunAndReturn(run func(*schemapb.CollectionSchema)) *MockMetaCache_UpdateSchema_Call {
+	_c.Call.Return(run)
+	return _c
+}
+
 // UpdateSegmentView provides a mock function with given fields: partitionID, newSegments, newSegmentsBF, allSegments
 func (_m *MockMetaCache) UpdateSegmentView(partitionID int64, newSegments []*datapb.SyncSegmentInfo, newSegmentsBF []*pkoracle.BloomFilterSet, allSegments map[int64]struct{}) {
 	_m.Called(partitionID, newSegments, newSegmentsBF, allSegments)

internal/flushcommon/pipeline/flow_graph_dd_node.go

@@ -296,6 +296,21 @@ func (ddn *ddNode) Operate(in []Msg) []Msg {
 			} else {
 				logger.Info("handle import message success")
 			}
+		case commonpb.MsgType_AddCollectionField:
+			schemaMsg := msg.(*adaptor.SchemaChangeMessageBody)
+			header := schemaMsg.SchemaChangeMessage.Header()
+			if header.GetCollectionId() != ddn.collectionID {
+				continue
+			}
+			logger := log.With(zap.String("vchannel", ddn.Name()))
+			logger.Info("receive schema change message")
+			body, err := schemaMsg.SchemaChangeMessage.Body()
+			if err != nil {
+				logger.Warn("failed to unmarshal schema change message body", zap.Error(err))
+				continue
+			}
+			fgMsg.updatedSchema = body.GetSchema()
+			ddn.msgHandler.HandleSchemaChange(ddn.ctx, ddn.vChannelName, schemaMsg)
 		}
 	}
 

internal/flushcommon/pipeline/flow_graph_message.go

@@ -18,6 +18,7 @@ package pipeline
 
 import (
 	"github.com/milvus-io/milvus-proto/go-api/v2/msgpb"
+	"github.com/milvus-io/milvus-proto/go-api/v2/schemapb"
 	"github.com/milvus-io/milvus/internal/flushcommon/util"
 	"github.com/milvus-io/milvus/internal/flushcommon/writebuffer"
 	"github.com/milvus-io/milvus/internal/storage"
@@ -60,6 +61,8 @@ type FlowGraphMsg struct {
 	segmentsToSync []typeutil.UniqueID
 	dropCollection bool
 	dropPartitions []typeutil.UniqueID
+
+	updatedSchema *schemapb.CollectionSchema
 }
 
 func (fgMsg *FlowGraphMsg) TimeTick() typeutil.Timestamp {

internal/flushcommon/pipeline/flow_graph_write_node.go

@@ -115,6 +115,11 @@ func (wNode *writeNode) Operate(in []Msg) []Msg {
 		wNode.updater.Update(wNode.channelName, end.GetTimestamp(), stats)
 	}
 
+	// update schema after all data processed
+	if fgMsg.updatedSchema != nil {
+		wNode.metacache.UpdateSchema(fgMsg.updatedSchema)
+	}
+
 	res := FlowGraphMsg{
 		TimeRange:      fgMsg.TimeRange,
 		StartPositions: fgMsg.StartPositions,

internal/flushcommon/util/msg_handler.go

@@ -22,6 +22,7 @@ import (
 	"github.com/milvus-io/milvus-proto/go-api/v2/msgpb"
 	"github.com/milvus-io/milvus/pkg/v2/proto/internalpb"
 	"github.com/milvus-io/milvus/pkg/v2/streaming/util/message"
+	"github.com/milvus-io/milvus/pkg/v2/streaming/util/message/adaptor"
 )
 
 type MsgHandler interface {
@@ -32,6 +33,8 @@ type MsgHandler interface {
 	HandleManualFlush(vchannel string, flushMsg message.ImmutableManualFlushMessageV2) error
 
 	HandleImport(ctx context.Context, vchannel string, importMsg *msgpb.ImportMsg) error
+
+	HandleSchemaChange(ctx context.Context, vchannel string, msg *adaptor.SchemaChangeMessageBody) error
 }
 
 func ConvertInternalImportFile(file *msgpb.ImportFile, _ int) *internalpb.ImportFile {

internal/mocks/flushcommon/mock_util/mock_MsgHandler.go

@@ -5,6 +5,8 @@ package mock_util
 import (
 	context "context"
 
+	adaptor "github.com/milvus-io/milvus/pkg/v2/streaming/util/message/adaptor"
+
 	message "github.com/milvus-io/milvus/pkg/v2/streaming/util/message"
 
 	mock "github.com/stretchr/testify/mock"
@@ -215,6 +217,54 @@ func (_c *MockMsgHandler_HandleManualFlush_Call) RunAndReturn(run func(string, m
 	return _c
 }
 
+// HandleSchemaChange provides a mock function with given fields: ctx, vchannel, msg
+func (_m *MockMsgHandler) HandleSchemaChange(ctx context.Context, vchannel string, msg *adaptor.SchemaChangeMessageBody) error {
+	ret := _m.Called(ctx, vchannel, msg)
+
+	if len(ret) == 0 {
+		panic("no return value specified for HandleSchemaChange")
+	}
+
+	var r0 error
+	if rf, ok := ret.Get(0).(func(context.Context, string, *adaptor.SchemaChangeMessageBody) error); ok {
+		r0 = rf(ctx, vchannel, msg)
+	} else {
+		r0 = ret.Error(0)
+	}
+
+	return r0
+}
+
+// MockMsgHandler_HandleSchemaChange_Call is a *mock.Call that shadows Run/Return methods with type explicit version for method 'HandleSchemaChange'
+type MockMsgHandler_HandleSchemaChange_Call struct {
+	*mock.Call
+}
+
+// HandleSchemaChange is a helper method to define mock.On call
+//   - ctx context.Context
+//   - vchannel string
+//   - msg *adaptor.SchemaChangeMessageBody
+func (_e *MockMsgHandler_Expecter) HandleSchemaChange(ctx interface{}, vchannel interface{}, msg interface{}) *MockMsgHandler_HandleSchemaChange_Call {
+	return &MockMsgHandler_HandleSchemaChange_Call{Call: _e.mock.On("HandleSchemaChange", ctx, vchannel, msg)}
+}
+
+func (_c *MockMsgHandler_HandleSchemaChange_Call) Run(run func(ctx context.Context, vchannel string, msg *adaptor.SchemaChangeMessageBody)) *MockMsgHandler_HandleSchemaChange_Call {
+	_c.Call.Run(func(args mock.Arguments) {
+		run(args[0].(context.Context), args[1].(string), args[2].(*adaptor.SchemaChangeMessageBody))
+	})
+	return _c
+}
+
+func (_c *MockMsgHandler_HandleSchemaChange_Call) Return(_a0 error) *MockMsgHandler_HandleSchemaChange_Call {
+	_c.Call.Return(_a0)
+	return _c
+}
+
+func (_c *MockMsgHandler_HandleSchemaChange_Call) RunAndReturn(run func(context.Context, string, *adaptor.SchemaChangeMessageBody) error) *MockMsgHandler_HandleSchemaChange_Call {
+	_c.Call.Return(run)
+	return _c
+}
+
 // NewMockMsgHandler creates a new instance of MockMsgHandler. It also registers a testing interface on the mock and a cleanup function to assert the mocks expectations.
 // The first argument is typically a *testing.T value.
 func NewMockMsgHandler(t interface {

internal/mocks/mock_querynode.go

@@ -1758,6 +1758,65 @@ func (_c *MockQueryNode_UnsubDmChannel_Call) RunAndReturn(run func(context.Conte
 	return _c
 }
 
+// UpdateSchema provides a mock function with given fields: _a0, _a1
+func (_m *MockQueryNode) UpdateSchema(_a0 context.Context, _a1 *querypb.UpdateSchemaRequest) (*commonpb.Status, error) {
+	ret := _m.Called(_a0, _a1)
+
+	if len(ret) == 0 {
+		panic("no return value specified for UpdateSchema")
+	}
+
+	var r0 *commonpb.Status
+	var r1 error
+	if rf, ok := ret.Get(0).(func(context.Context, *querypb.UpdateSchemaRequest) (*commonpb.Status, error)); ok {
+		return rf(_a0, _a1)
+	}
+	if rf, ok := ret.Get(0).(func(context.Context, *querypb.UpdateSchemaRequest) *commonpb.Status); ok {
+		r0 = rf(_a0, _a1)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*commonpb.Status)
+		}
+	}
+
+	if rf, ok := ret.Get(1).(func(context.Context, *querypb.UpdateSchemaRequest) error); ok {
+		r1 = rf(_a0, _a1)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// MockQueryNode_UpdateSchema_Call is a *mock.Call that shadows Run/Return methods with type explicit version for method 'UpdateSchema'
+type MockQueryNode_UpdateSchema_Call struct {
+	*mock.Call
+}
+
+// UpdateSchema is a helper method to define mock.On call
+//   - _a0 context.Context
+//   - _a1 *querypb.UpdateSchemaRequest
+func (_e *MockQueryNode_Expecter) UpdateSchema(_a0 interface{}, _a1 interface{}) *MockQueryNode_UpdateSchema_Call {
+	return &MockQueryNode_UpdateSchema_Call{Call: _e.mock.On("UpdateSchema", _a0, _a1)}
+}
+
+func (_c *MockQueryNode_UpdateSchema_Call) Run(run func(_a0 context.Context, _a1 *querypb.UpdateSchemaRequest)) *MockQueryNode_UpdateSchema_Call {
+	_c.Call.Run(func(args mock.Arguments) {
+		run(args[0].(context.Context), args[1].(*querypb.UpdateSchemaRequest))
+	})
+	return _c
+}
+
+func (_c *MockQueryNode_UpdateSchema_Call) Return(_a0 *commonpb.Status, _a1 error) *MockQueryNode_UpdateSchema_Call {
+	_c.Call.Return(_a0, _a1)
+	return _c
+}
+
+func (_c *MockQueryNode_UpdateSchema_Call) RunAndReturn(run func(context.Context, *querypb.UpdateSchemaRequest) (*commonpb.Status, error)) *MockQueryNode_UpdateSchema_Call {
+	_c.Call.Return(run)
+	return _c
+}
+
 // UpdateStateCode provides a mock function with given fields: stateCode
 func (_m *MockQueryNode) UpdateStateCode(stateCode commonpb.StateCode) {
 	_m.Called(stateCode)

internal/mocks/mock_querynode_client.go

@@ -1852,6 +1852,80 @@ func (_c *MockQueryNodeClient_UnsubDmChannel_Call) RunAndReturn(run func(context
 	return _c
 }
 
+// UpdateSchema provides a mock function with given fields: ctx, in, opts
+func (_m *MockQueryNodeClient) UpdateSchema(ctx context.Context, in *querypb.UpdateSchemaRequest, opts ...grpc.CallOption) (*commonpb.Status, error) {
+	_va := make([]interface{}, len(opts))
+	for _i := range opts {
+		_va[_i] = opts[_i]
+	}
+	var _ca []interface{}
+	_ca = append(_ca, ctx, in)
+	_ca = append(_ca, _va...)
+	ret := _m.Called(_ca...)
+
+	if len(ret) == 0 {
+		panic("no return value specified for UpdateSchema")
+	}
+
+	var r0 *commonpb.Status
+	var r1 error
+	if rf, ok := ret.Get(0).(func(context.Context, *querypb.UpdateSchemaRequest, ...grpc.CallOption) (*commonpb.Status, error)); ok {
+		return rf(ctx, in, opts...)
+	}
+	if rf, ok := ret.Get(0).(func(context.Context, *querypb.UpdateSchemaRequest, ...grpc.CallOption) *commonpb.Status); ok {
+		r0 = rf(ctx, in, opts...)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*commonpb.Status)
+		}
+	}
+
+	if rf, ok := ret.Get(1).(func(context.Context, *querypb.UpdateSchemaRequest, ...grpc.CallOption) error); ok {
+		r1 = rf(ctx, in, opts...)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// MockQueryNodeClient_UpdateSchema_Call is a *mock.Call that shadows Run/Return methods with type explicit version for method 'UpdateSchema'
+type MockQueryNodeClient_UpdateSchema_Call struct {
+	*mock.Call
+}
+
+// UpdateSchema is a helper method to define mock.On call
+//   - ctx context.Context
+//   - in *querypb.UpdateSchemaRequest
+//   - opts ...grpc.CallOption
+func (_e *MockQueryNodeClient_Expecter) UpdateSchema(ctx interface{}, in interface{}, opts ...interface{}) *MockQueryNodeClient_UpdateSchema_Call {
+	return &MockQueryNodeClient_UpdateSchema_Call{Call: _e.mock.On("UpdateSchema",
+		append([]interface{}{ctx, in}, opts...)...)}
+}
+
+func (_c *MockQueryNodeClient_UpdateSchema_Call) Run(run func(ctx context.Context, in *querypb.UpdateSchemaRequest, opts ...grpc.CallOption)) *MockQueryNodeClient_UpdateSchema_Call {
+	_c.Call.Run(func(args mock.Arguments) {
+		variadicArgs := make([]grpc.CallOption, len(args)-2)
+		for i, a := range args[2:] {
+			if a != nil {
+				variadicArgs[i] = a.(grpc.CallOption)
+			}
+		}
+		run(args[0].(context.Context), args[1].(*querypb.UpdateSchemaRequest), variadicArgs...)
+	})
+	return _c
+}
+
+func (_c *MockQueryNodeClient_UpdateSchema_Call) Return(_a0 *commonpb.Status, _a1 error) *MockQueryNodeClient_UpdateSchema_Call {
+	_c.Call.Return(_a0, _a1)
+	return _c
+}
+
+func (_c *MockQueryNodeClient_UpdateSchema_Call) RunAndReturn(run func(context.Context, *querypb.UpdateSchemaRequest, ...grpc.CallOption) (*commonpb.Status, error)) *MockQueryNodeClient_UpdateSchema_Call {
+	_c.Call.Return(run)
+	return _c
+}
+
 // WatchDmChannels provides a mock function with given fields: ctx, in, opts
 func (_m *MockQueryNodeClient) WatchDmChannels(ctx context.Context, in *querypb.WatchDmChannelsRequest, opts ...grpc.CallOption) (*commonpb.Status, error) {
 	_va := make([]interface{}, len(opts))

internal/querycoordv2/mocks/mock_querynode.go

@@ -1421,6 +1421,65 @@ func (_c *MockQueryNodeServer_UnsubDmChannel_Call) RunAndReturn(run func(context
 	return _c
 }
 
+// UpdateSchema provides a mock function with given fields: _a0, _a1
+func (_m *MockQueryNodeServer) UpdateSchema(_a0 context.Context, _a1 *querypb.UpdateSchemaRequest) (*commonpb.Status, error) {
+	ret := _m.Called(_a0, _a1)
+
+	if len(ret) == 0 {
+		panic("no return value specified for UpdateSchema")
+	}
+
+	var r0 *commonpb.Status
+	var r1 error
+	if rf, ok := ret.Get(0).(func(context.Context, *querypb.UpdateSchemaRequest) (*commonpb.Status, error)); ok {
+		return rf(_a0, _a1)
+	}
+	if rf, ok := ret.Get(0).(func(context.Context, *querypb.UpdateSchemaRequest) *commonpb.Status); ok {
+		r0 = rf(_a0, _a1)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*commonpb.Status)
+		}
+	}
+
+	if rf, ok := ret.Get(1).(func(context.Context, *querypb.UpdateSchemaRequest) error); ok {
+		r1 = rf(_a0, _a1)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// MockQueryNodeServer_UpdateSchema_Call is a *mock.Call that shadows Run/Return methods with type explicit version for method 'UpdateSchema'
+type MockQueryNodeServer_UpdateSchema_Call struct {
+	*mock.Call
+}
+
+// UpdateSchema is a helper method to define mock.On call
+//   - _a0 context.Context
+//   - _a1 *querypb.UpdateSchemaRequest
+func (_e *MockQueryNodeServer_Expecter) UpdateSchema(_a0 interface{}, _a1 interface{}) *MockQueryNodeServer_UpdateSchema_Call {
+	return &MockQueryNodeServer_UpdateSchema_Call{Call: _e.mock.On("UpdateSchema", _a0, _a1)}
+}
+
+func (_c *MockQueryNodeServer_UpdateSchema_Call) Run(run func(_a0 context.Context, _a1 *querypb.UpdateSchemaRequest)) *MockQueryNodeServer_UpdateSchema_Call {
+	_c.Call.Run(func(args mock.Arguments) {
+		run(args[0].(context.Context), args[1].(*querypb.UpdateSchemaRequest))
+	})
+	return _c
+}
+
+func (_c *MockQueryNodeServer_UpdateSchema_Call) Return(_a0 *commonpb.Status, _a1 error) *MockQueryNodeServer_UpdateSchema_Call {
+	_c.Call.Return(_a0, _a1)
+	return _c
+}
+
+func (_c *MockQueryNodeServer_UpdateSchema_Call) RunAndReturn(run func(context.Context, *querypb.UpdateSchemaRequest) (*commonpb.Status, error)) *MockQueryNodeServer_UpdateSchema_Call {
+	_c.Call.Return(run)
+	return _c
+}
+
 // WatchDmChannels provides a mock function with given fields: _a0, _a1
 func (_m *MockQueryNodeServer) WatchDmChannels(_a0 context.Context, _a1 *querypb.WatchDmChannelsRequest) (*commonpb.Status, error) {
 	ret := _m.Called(_a0, _a1)

internal/querynodev2/cluster/mock_worker.go

@@ -5,7 +5,10 @@ package cluster
 import (
 	context "context"
 
+	commonpb "github.com/milvus-io/milvus-proto/go-api/v2/commonpb"
+
 	internalpb "github.com/milvus-io/milvus/pkg/v2/proto/internalpb"
+
 	mock "github.com/stretchr/testify/mock"
 
 	querypb "github.com/milvus-io/milvus/pkg/v2/proto/querypb"
@@ -528,6 +531,65 @@ func (_c *MockWorker_Stop_Call) RunAndReturn(run func()) *MockWorker_Stop_Call {
 	return _c
 }
 
+// UpdateSchema provides a mock function with given fields: ctx, req
+func (_m *MockWorker) UpdateSchema(ctx context.Context, req *querypb.UpdateSchemaRequest) (*commonpb.Status, error) {
+	ret := _m.Called(ctx, req)
+
+	if len(ret) == 0 {
+		panic("no return value specified for UpdateSchema")
+	}
+
+	var r0 *commonpb.Status
+	var r1 error
+	if rf, ok := ret.Get(0).(func(context.Context, *querypb.UpdateSchemaRequest) (*commonpb.Status, error)); ok {
+		return rf(ctx, req)
+	}
+	if rf, ok := ret.Get(0).(func(context.Context, *querypb.UpdateSchemaRequest) *commonpb.Status); ok {
+		r0 = rf(ctx, req)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*commonpb.Status)
+		}
+	}
+
+	if rf, ok := ret.Get(1).(func(context.Context, *querypb.UpdateSchemaRequest) error); ok {
+		r1 = rf(ctx, req)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// MockWorker_UpdateSchema_Call is a *mock.Call that shadows Run/Return methods with type explicit version for method 'UpdateSchema'
+type MockWorker_UpdateSchema_Call struct {
+	*mock.Call
+}
+
+// UpdateSchema is a helper method to define mock.On call
+//   - ctx context.Context
+//   - req *querypb.UpdateSchemaRequest
+func (_e *MockWorker_Expecter) UpdateSchema(ctx interface{}, req interface{}) *MockWorker_UpdateSchema_Call {
+	return &MockWorker_UpdateSchema_Call{Call: _e.mock.On("UpdateSchema", ctx, req)}
+}
+
+func (_c *MockWorker_UpdateSchema_Call) Run(run func(ctx context.Context, req *querypb.UpdateSchemaRequest)) *MockWorker_UpdateSchema_Call {
+	_c.Call.Run(func(args mock.Arguments) {
+		run(args[0].(context.Context), args[1].(*querypb.UpdateSchemaRequest))
+	})
+	return _c
+}
+
+func (_c *MockWorker_UpdateSchema_Call) Return(_a0 *commonpb.Status, _a1 error) *MockWorker_UpdateSchema_Call {
+	_c.Call.Return(_a0, _a1)
+	return _c
+}
+
+func (_c *MockWorker_UpdateSchema_Call) RunAndReturn(run func(context.Context, *querypb.UpdateSchemaRequest) (*commonpb.Status, error)) *MockWorker_UpdateSchema_Call {
+	_c.Call.Return(run)
+	return _c
+}
+
 // NewMockWorker creates a new instance of MockWorker. It also registers a testing interface on the mock and a cleanup function to assert the mocks expectations.
 // The first argument is typically a *testing.T value.
 func NewMockWorker(t interface {

internal/querynodev2/cluster/worker.go

@@ -25,6 +25,7 @@ import (
 	"go.uber.org/atomic"
 	"go.uber.org/zap"
 
+	"github.com/milvus-io/milvus-proto/go-api/v2/commonpb"
 	"github.com/milvus-io/milvus/internal/types"
 	"github.com/milvus-io/milvus/internal/util/streamrpc"
 	"github.com/milvus-io/milvus/pkg/v2/log"
@@ -44,6 +45,7 @@ type Worker interface {
 	QuerySegments(ctx context.Context, req *querypb.QueryRequest) (*internalpb.RetrieveResults, error)
 	QueryStreamSegments(ctx context.Context, req *querypb.QueryRequest, srv streamrpc.QueryStreamServer) error
 	GetStatistics(ctx context.Context, req *querypb.GetStatisticsRequest) (*internalpb.GetStatisticsResponse, error)
+	UpdateSchema(ctx context.Context, req *querypb.UpdateSchemaRequest) (*commonpb.Status, error)
 
 	IsHealthy() bool
 	Stop()
@@ -247,6 +249,11 @@ func (w *remoteWorker) GetStatistics(ctx context.Context, req *querypb.GetStatis
 	return client.GetStatistics(ctx, req)
 }
 
+func (w *remoteWorker) UpdateSchema(ctx context.Context, req *querypb.UpdateSchemaRequest) (*commonpb.Status, error) {
+	client := w.getClient()
+	return client.UpdateSchema(ctx, req)
+}
+
 func (w *remoteWorker) IsHealthy() bool {
 	return true
 }

internal/querynodev2/delegator/delegator.go

@@ -52,6 +52,7 @@ import (
 	"github.com/milvus-io/milvus/pkg/v2/mq/msgstream"
 	"github.com/milvus-io/milvus/pkg/v2/proto/internalpb"
 	"github.com/milvus-io/milvus/pkg/v2/proto/querypb"
+	"github.com/milvus-io/milvus/pkg/v2/util/commonpbutil"
 	"github.com/milvus-io/milvus/pkg/v2/util/conc"
 	"github.com/milvus-io/milvus/pkg/v2/util/funcutil"
 	"github.com/milvus-io/milvus/pkg/v2/util/lifetime"
@@ -76,6 +77,7 @@ type ShardDelegator interface {
 	Query(ctx context.Context, req *querypb.QueryRequest) ([]*internalpb.RetrieveResults, error)
 	QueryStream(ctx context.Context, req *querypb.QueryRequest, srv streamrpc.QueryStreamServer) error
 	GetStatistics(ctx context.Context, req *querypb.GetStatisticsRequest) ([]*internalpb.GetStatisticsResponse, error)
+	UpdateSchema(ctx context.Context, sch *schemapb.CollectionSchema) error
 
 	// data
 	ProcessInsert(insertRecords map[int64]*InsertData)
@@ -856,6 +858,51 @@ func (sd *shardDelegator) GetTSafe() uint64 {
 	return sd.latestTsafe.Load()
 }
 
+func (sd *shardDelegator) UpdateSchema(ctx context.Context, schema *schemapb.CollectionSchema) error {
+	log := sd.getLogger(ctx)
+	if err := sd.lifetime.Add(lifetime.IsWorking); err != nil {
+		return err
+	}
+	defer sd.lifetime.Done()
+
+	log.Info("delegator received update schema event")
+
+	sealed, growing, version, err := sd.distribution.PinReadableSegments()
+	if err != nil {
+		log.Warn("delegator failed to query, current distribution is not serviceable", zap.Error(err))
+		return err
+	}
+	defer sd.distribution.Unpin(version)
+
+	tasks, err := organizeSubTask(ctx, &querypb.UpdateSchemaRequest{
+		Base: commonpbutil.NewMsgBase(
+			commonpbutil.WithSourceID(paramtable.GetNodeID()),
+		),
+		CollectionID: sd.collectionID,
+		Schema:       schema,
+	}, sealed, growing, sd, func(req *querypb.UpdateSchemaRequest, scope querypb.DataScope, segmentIDs []int64, targetID int64) *querypb.UpdateSchemaRequest {
+		nodeReq := typeutil.Clone(req)
+		nodeReq.GetBase().TargetID = targetID
+		return nodeReq
+	})
+	if err != nil {
+		return err
+	}
+
+	_, err = executeSubTasks(ctx, tasks, func(ctx context.Context, req *querypb.UpdateSchemaRequest, worker cluster.Worker) (*StatusWrapper, error) {
+		status, err := worker.UpdateSchema(ctx, req)
+		return (*StatusWrapper)(status), err
+	}, "UpdateSchema", log)
+
+	return err
+}
+
+type StatusWrapper commonpb.Status
+
+func (w *StatusWrapper) GetStatus() *commonpb.Status {
+	return (*commonpb.Status)(w)
+}
+
 // Close closes the delegator.
 func (sd *shardDelegator) Close() {
 	sd.lifetime.SetState(lifetime.Stopped)

internal/querynodev2/delegator/delegator_test.go

@@ -1189,6 +1189,99 @@ func (s *DelegatorSuite) TestGetStats() {
 	})
 }
 
+func (s *DelegatorSuite) TestUpdateSchema() {
+	s.delegator.Start()
+	paramtable.SetNodeID(1)
+	s.initSegments()
+
+	s.Run("normal", func() {
+		workers := make(map[int64]*cluster.MockWorker)
+		worker1 := cluster.NewMockWorker(s.T())
+		worker2 := cluster.NewMockWorker(s.T())
+
+		workers[1] = worker1
+		workers[2] = worker2
+
+		worker1.EXPECT().UpdateSchema(mock.Anything, mock.AnythingOfType("*querypb.UpdateSchemaRequest")).RunAndReturn(func(ctx context.Context, usr *querypb.UpdateSchemaRequest) (*commonpb.Status, error) {
+			return merr.Success(), nil
+		}).Twice()
+
+		worker2.EXPECT().UpdateSchema(mock.Anything, mock.AnythingOfType("*querypb.UpdateSchemaRequest")).RunAndReturn(func(ctx context.Context, usr *querypb.UpdateSchemaRequest) (*commonpb.Status, error) {
+			return merr.Success(), nil
+		}).Once()
+
+		s.workerManager.EXPECT().GetWorker(mock.Anything, mock.AnythingOfType("int64")).Call.Return(func(_ context.Context, nodeID int64) cluster.Worker {
+			return workers[nodeID]
+		}, nil).Times(3) // currently node 1 will be called twice for growing & sealed
+
+		ctx, cancel := context.WithCancel(context.Background())
+		defer cancel()
+
+		err := s.delegator.UpdateSchema(ctx, &schemapb.CollectionSchema{})
+		s.NoError(err)
+	})
+
+	s.Run("worker_return_error", func() {
+		workers := make(map[int64]*cluster.MockWorker)
+		worker1 := cluster.NewMockWorker(s.T())
+		worker2 := cluster.NewMockWorker(s.T())
+
+		workers[1] = worker1
+		workers[2] = worker2
+
+		worker1.EXPECT().UpdateSchema(mock.Anything, mock.AnythingOfType("*querypb.UpdateSchemaRequest")).RunAndReturn(func(ctx context.Context, usr *querypb.UpdateSchemaRequest) (*commonpb.Status, error) {
+			return merr.Status(merr.WrapErrServiceInternal("mocked")), merr.WrapErrServiceInternal("mocked")
+		}).Maybe()
+
+		worker2.EXPECT().UpdateSchema(mock.Anything, mock.AnythingOfType("*querypb.UpdateSchemaRequest")).RunAndReturn(func(ctx context.Context, usr *querypb.UpdateSchemaRequest) (*commonpb.Status, error) {
+			return merr.Success(), nil
+		}).Maybe()
+
+		s.workerManager.EXPECT().GetWorker(mock.Anything, mock.AnythingOfType("int64")).Call.Return(func(_ context.Context, nodeID int64) cluster.Worker {
+			return workers[nodeID]
+		}, nil).Times(3)
+
+		ctx, cancel := context.WithCancel(context.Background())
+		defer cancel()
+
+		err := s.delegator.UpdateSchema(ctx, &schemapb.CollectionSchema{})
+		s.Error(err)
+	})
+
+	s.Run("worker_manager_error", func() {
+		s.workerManager.EXPECT().GetWorker(mock.Anything, mock.AnythingOfType("int64")).RunAndReturn(func(ctx context.Context, i int64) (cluster.Worker, error) {
+			return nil, merr.WrapErrServiceInternal("mocked")
+		}).Once()
+		ctx, cancel := context.WithCancel(context.Background())
+		defer cancel()
+
+		err := s.delegator.UpdateSchema(ctx, &schemapb.CollectionSchema{})
+		s.Error(err)
+	})
+
+	s.Run("distribution_not_serviceable", func() {
+		ctx, cancel := context.WithCancel(context.Background())
+		defer cancel()
+
+		sd, ok := s.delegator.(*shardDelegator)
+		s.Require().True(ok)
+		sd.distribution.AddOfflines(1001)
+
+		err := s.delegator.UpdateSchema(ctx, &schemapb.CollectionSchema{})
+		s.Error(err)
+	})
+
+	s.Run("cluster_not_serviceable", func() {
+		s.delegator.Close()
+
+		ctx, cancel := context.WithCancel(context.Background())
+		defer cancel()
+
+		err := s.delegator.UpdateSchema(ctx, &schemapb.CollectionSchema{})
+		s.Error(err)
+	})
+}
+
 func TestDelegatorSuite(t *testing.T) {
 	suite.Run(t, new(DelegatorSuite))
 }

internal/querynodev2/delegator/mock_delegator.go

@@ -12,6 +12,8 @@ import (
 
 	querypb "github.com/milvus-io/milvus/pkg/v2/proto/querypb"
 
+	schemapb "github.com/milvus-io/milvus-proto/go-api/v2/schemapb"
+
 	streamrpc "github.com/milvus-io/milvus/internal/util/streamrpc"
 )
 
@@ -1105,6 +1107,53 @@ func (_c *MockShardDelegator_TryCleanExcludedSegments_Call) RunAndReturn(run fun
 	return _c
 }
 
+// UpdateSchema provides a mock function with given fields: ctx, sch
+func (_m *MockShardDelegator) UpdateSchema(ctx context.Context, sch *schemapb.CollectionSchema) error {
+	ret := _m.Called(ctx, sch)
+
+	if len(ret) == 0 {
+		panic("no return value specified for UpdateSchema")
+	}
+
+	var r0 error
+	if rf, ok := ret.Get(0).(func(context.Context, *schemapb.CollectionSchema) error); ok {
+		r0 = rf(ctx, sch)
+	} else {
+		r0 = ret.Error(0)
+	}
+
+	return r0
+}
+
+// MockShardDelegator_UpdateSchema_Call is a *mock.Call that shadows Run/Return methods with type explicit version for method 'UpdateSchema'
+type MockShardDelegator_UpdateSchema_Call struct {
+	*mock.Call
+}
+
+// UpdateSchema is a helper method to define mock.On call
+//   - ctx context.Context
+//   - sch *schemapb.CollectionSchema
+func (_e *MockShardDelegator_Expecter) UpdateSchema(ctx interface{}, sch interface{}) *MockShardDelegator_UpdateSchema_Call {
+	return &MockShardDelegator_UpdateSchema_Call{Call: _e.mock.On("UpdateSchema", ctx, sch)}
+}
+
+func (_c *MockShardDelegator_UpdateSchema_Call) Run(run func(ctx context.Context, sch *schemapb.CollectionSchema)) *MockShardDelegator_UpdateSchema_Call {
+	_c.Call.Run(func(args mock.Arguments) {
+		run(args[0].(context.Context), args[1].(*schemapb.CollectionSchema))
+	})
+	return _c
+}
+
+func (_c *MockShardDelegator_UpdateSchema_Call) Return(_a0 error) *MockShardDelegator_UpdateSchema_Call {
+	_c.Call.Return(_a0)
+	return _c
+}
+
+func (_c *MockShardDelegator_UpdateSchema_Call) RunAndReturn(run func(context.Context, *schemapb.CollectionSchema) error) *MockShardDelegator_UpdateSchema_Call {
+	_c.Call.Return(run)
+	return _c
+}
+
 // UpdateTSafe provides a mock function with given fields: ts
 func (_m *MockShardDelegator) UpdateTSafe(ts uint64) {
 	_m.Called(ts)

internal/querynodev2/local_worker.go

@@ -19,6 +19,7 @@ package querynodev2
 import (
 	"context"
 
+	"github.com/milvus-io/milvus-proto/go-api/v2/commonpb"
 	"github.com/milvus-io/milvus/internal/querynodev2/cluster"
 	"github.com/milvus-io/milvus/internal/util/streamrpc"
 	"github.com/milvus-io/milvus/pkg/v2/proto/internalpb"
@@ -73,6 +74,10 @@ func (w *LocalWorker) GetStatistics(ctx context.Context, req *querypb.GetStatist
 	return w.node.GetStatistics(ctx, req)
 }
 
+func (w *LocalWorker) UpdateSchema(ctx context.Context, req *querypb.UpdateSchemaRequest) (*commonpb.Status, error) {
+	return w.node.UpdateSchema(ctx, req)
+}
+
 func (w *LocalWorker) IsHealthy() bool {
 	return true
 }

internal/querynodev2/pipeline/delete_node.go

@@ -17,6 +17,7 @@
 package pipeline
 
 import (
+	"context"
 	"fmt"
 
 	"github.com/samber/lo"
@@ -76,6 +77,10 @@ func (dNode *deleteNode) Operate(in Msg) Msg {
 		dNode.delegator.ProcessDelete(lo.Values(deleteDatas), nodeMsg.timeRange.timestampMax)
 	}
 
+	if nodeMsg.schema != nil {
+		dNode.delegator.UpdateSchema(context.Background(), nodeMsg.schema)
+	}
+
 	// update tSafe
 	dNode.delegator.UpdateTSafe(nodeMsg.timeRange.timestampMax)
 	return nil

internal/querynodev2/pipeline/filter_node.go

@@ -29,6 +29,7 @@ import (
 	"github.com/milvus-io/milvus/pkg/v2/log"
 	"github.com/milvus-io/milvus/pkg/v2/metrics"
 	"github.com/milvus-io/milvus/pkg/v2/mq/msgstream"
+	"github.com/milvus-io/milvus/pkg/v2/streaming/util/message/adaptor"
 	"github.com/milvus-io/milvus/pkg/v2/util/merr"
 	"github.com/milvus-io/milvus/pkg/v2/util/paramtable"
 	"github.com/milvus-io/milvus/pkg/v2/util/tsoutil"
@@ -134,6 +135,13 @@ func (fNode *filterNode) filtrate(c *Collection, msg msgstream.TsMsg) error {
 				return err
 			}
 		}
+	case commonpb.MsgType_AddCollectionField:
+		schemaMsg := msg.(*adaptor.SchemaChangeMessageBody)
+		header := schemaMsg.SchemaChangeMessage.Header()
+		if header.GetCollectionId() != fNode.collectionID {
+			return merr.WrapErrCollectionNotFound(header.GetCollectionId())
+		}
+		return nil
 	default:
 		return merr.WrapErrParameterInvalid("msgType is Insert or Delete", "not")
 	}

internal/querynodev2/pipeline/insert_node.go

@@ -118,6 +118,7 @@ func (iNode *insertNode) Operate(in Msg) Msg {
 	return &deleteNodeMsg{
 		deleteMsgs: nodeMsg.deleteMsgs,
 		timeRange:  nodeMsg.timeRange,
+		schema:     nodeMsg.schema,
 	}
 }
 

internal/querynodev2/pipeline/message.go

@@ -18,9 +18,11 @@ package pipeline
 
 import (
 	"github.com/milvus-io/milvus-proto/go-api/v2/commonpb"
+	"github.com/milvus-io/milvus-proto/go-api/v2/schemapb"
 	"github.com/milvus-io/milvus/internal/querynodev2/collector"
 	"github.com/milvus-io/milvus/internal/querynodev2/delegator"
 	"github.com/milvus-io/milvus/pkg/v2/mq/msgstream"
+	"github.com/milvus-io/milvus/pkg/v2/streaming/util/message/adaptor"
 	"github.com/milvus-io/milvus/pkg/v2/util/merr"
 	"github.com/milvus-io/milvus/pkg/v2/util/metricsinfo"
 )
@@ -30,11 +32,13 @@ type insertNodeMsg struct {
 	deleteMsgs  []*DeleteMsg
 	insertDatas map[int64]*delegator.InsertData
 	timeRange   TimeRange
+	schema      *schemapb.CollectionSchema
 }
 
 type deleteNodeMsg struct {
 	deleteMsgs []*DeleteMsg
 	timeRange  TimeRange
+	schema     *schemapb.CollectionSchema
 }
 
 func (msg *insertNodeMsg) append(taskMsg msgstream.TsMsg) error {
@@ -47,6 +51,13 @@ func (msg *insertNodeMsg) append(taskMsg msgstream.TsMsg) error {
 		deleteMsg := taskMsg.(*DeleteMsg)
 		msg.deleteMsgs = append(msg.deleteMsgs, deleteMsg)
 		collector.Rate.Add(metricsinfo.DeleteConsumeThroughput, float64(deleteMsg.Size()))
+	case commonpb.MsgType_AddCollectionField:
+		schemaMsg := taskMsg.(*adaptor.SchemaChangeMessageBody)
+		body, err := schemaMsg.SchemaChangeMessage.Body()
+		if err != nil {
+			return err
+		}
+		msg.schema = body.GetSchema()
 	default:
 		return merr.WrapErrParameterInvalid("msgType is Insert or Delete", "not")
 	}

internal/querynodev2/segments/collection.go

@@ -33,6 +33,7 @@ import (
 	"github.com/milvus-io/milvus/pkg/v2/metrics"
 	"github.com/milvus-io/milvus/pkg/v2/proto/querypb"
 	"github.com/milvus-io/milvus/pkg/v2/proto/segcorepb"
+	"github.com/milvus-io/milvus/pkg/v2/util/merr"
 	"github.com/milvus-io/milvus/pkg/v2/util/paramtable"
 	"github.com/milvus-io/milvus/pkg/v2/util/typeutil"
 )
@@ -47,6 +48,8 @@ type CollectionManager interface {
 	// returns true if the collection ref count goes 0, or the collection not exists,
 	// return false otherwise
 	Unref(collectionID int64, count uint32) bool
+	// UpdateSchema update the underlying collection schema of the provided collection.
+	UpdateSchema(collectionID int64, schema *schemapb.CollectionSchema) error
 }
 
 type collectionManager struct {
@@ -106,6 +109,22 @@ func (m *collectionManager) PutOrRef(collectionID int64, schema *schemapb.Collec
 	return nil
 }
 
+func (m *collectionManager) UpdateSchema(collectionID int64, schema *schemapb.CollectionSchema) error {
+	m.mut.Lock()
+	defer m.mut.Unlock()
+
+	collection, ok := m.collections[collectionID]
+	if !ok {
+		return merr.WrapErrCollectionNotFound(collectionID, "collection not found in querynode collection manager")
+	}
+
+	if err := collection.ccollection.UpdateSchema(schema); err != nil {
+		return err
+	}
+	collection.schema.Store(schema)
+	return nil
+}
+
 func (m *collectionManager) updateMetric() {
 	metrics.QueryNodeNumCollections.WithLabelValues(fmt.Sprint(paramtable.GetNodeID())).Set(float64(len(m.collections)))
 }

internal/querynodev2/segments/collection_test.go

@@ -0,0 +1,93 @@
+// Licensed to the LF AI & Data foundation under one
+// or more contributor license agreements. See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership. The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package segments
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/suite"
+
+	"github.com/milvus-io/milvus-proto/go-api/v2/commonpb"
+	"github.com/milvus-io/milvus-proto/go-api/v2/schemapb"
+	"github.com/milvus-io/milvus/internal/mocks/util/mock_segcore"
+	"github.com/milvus-io/milvus/pkg/v2/common"
+	"github.com/milvus-io/milvus/pkg/v2/proto/querypb"
+	"github.com/milvus-io/milvus/pkg/v2/util/paramtable"
+)
+
+type CollectionManagerSuite struct {
+	suite.Suite
+	cm *collectionManager
+}
+
+func (s *CollectionManagerSuite) SetupSuite() {
+	paramtable.Init()
+}
+
+func (s *CollectionManagerSuite) SetupTest() {
+	s.cm = NewCollectionManager()
+	schema := mock_segcore.GenTestCollectionSchema("collection_1", schemapb.DataType_Int64, false)
+	err := s.cm.PutOrRef(1, schema, mock_segcore.GenTestIndexMeta(1, schema), &querypb.LoadMetaInfo{
+		LoadType: querypb.LoadType_LoadCollection,
+		DbProperties: []*commonpb.KeyValuePair{
+			{
+				Key:   common.ReplicateIDKey,
+				Value: "local-test",
+			},
+		},
+	})
+	s.Require().NoError(err)
+}
+
+func (s *CollectionManagerSuite) TestUpdateSchema() {
+	s.Run("normal_case", func() {
+		schema := mock_segcore.GenTestCollectionSchema("collection_1", schemapb.DataType_Int64, false)
+		schema.Fields = append(schema.Fields, &schemapb.FieldSchema{
+			FieldID:  common.StartOfUserFieldID + int64(len(schema.Fields)),
+			Name:     "added_field",
+			DataType: schemapb.DataType_Bool,
+			Nullable: true,
+		})
+
+		err := s.cm.UpdateSchema(1, schema)
+		s.NoError(err)
+	})
+
+	s.Run("not_exist_collection", func() {
+		schema := mock_segcore.GenTestCollectionSchema("collection_1", schemapb.DataType_Int64, false)
+		schema.Fields = append(schema.Fields, &schemapb.FieldSchema{
+			FieldID:  common.StartOfUserFieldID + int64(len(schema.Fields)),
+			Name:     "added_field",
+			DataType: schemapb.DataType_Bool,
+			Nullable: true,
+		})
+
+		err := s.cm.UpdateSchema(2, schema)
+		s.Error(err)
+	})
+
+	s.Run("nil_schema", func() {
+		s.NotPanics(func() {
+			err := s.cm.UpdateSchema(1, nil)
+			s.Error(err)
+		})
+	})
+}
+
+func TestCollectionManager(t *testing.T) {
+	suite.Run(t, new(CollectionManagerSuite))
+}

internal/querynodev2/segments/mock_collection_manager.go

@@ -308,6 +308,53 @@ func (_c *MockCollectionManager_Unref_Call) RunAndReturn(run func(int64, uint32)
 	return _c
 }
 
+// UpdateSchema provides a mock function with given fields: collectionID, schema
+func (_m *MockCollectionManager) UpdateSchema(collectionID int64, schema *schemapb.CollectionSchema) error {
+	ret := _m.Called(collectionID, schema)
+
+	if len(ret) == 0 {
+		panic("no return value specified for UpdateSchema")
+	}
+
+	var r0 error
+	if rf, ok := ret.Get(0).(func(int64, *schemapb.CollectionSchema) error); ok {
+		r0 = rf(collectionID, schema)
+	} else {
+		r0 = ret.Error(0)
+	}
+
+	return r0
+}
+
+// MockCollectionManager_UpdateSchema_Call is a *mock.Call that shadows Run/Return methods with type explicit version for method 'UpdateSchema'
+type MockCollectionManager_UpdateSchema_Call struct {
+	*mock.Call
+}
+
+// UpdateSchema is a helper method to define mock.On call
+//   - collectionID int64
+//   - schema *schemapb.CollectionSchema
+func (_e *MockCollectionManager_Expecter) UpdateSchema(collectionID interface{}, schema interface{}) *MockCollectionManager_UpdateSchema_Call {
+	return &MockCollectionManager_UpdateSchema_Call{Call: _e.mock.On("UpdateSchema", collectionID, schema)}
+}
+
+func (_c *MockCollectionManager_UpdateSchema_Call) Run(run func(collectionID int64, schema *schemapb.CollectionSchema)) *MockCollectionManager_UpdateSchema_Call {
+	_c.Call.Run(func(args mock.Arguments) {
+		run(args[0].(int64), args[1].(*schemapb.CollectionSchema))
+	})
+	return _c
+}
+
+func (_c *MockCollectionManager_UpdateSchema_Call) Return(_a0 error) *MockCollectionManager_UpdateSchema_Call {
+	_c.Call.Return(_a0)
+	return _c
+}
+
+func (_c *MockCollectionManager_UpdateSchema_Call) RunAndReturn(run func(int64, *schemapb.CollectionSchema) error) *MockCollectionManager_UpdateSchema_Call {
+	_c.Call.Return(run)
+	return _c
+}
+
 // NewMockCollectionManager creates a new instance of MockCollectionManager. It also registers a testing interface on the mock and a cleanup function to assert the mocks expectations.
 // The first argument is typically a *testing.T value.
 func NewMockCollectionManager(t interface {

internal/querynodev2/services.go

@@ -505,6 +505,28 @@ func (node *QueryNode) LoadSegments(ctx context.Context, req *querypb.LoadSegmen
 	return merr.Success(), nil
 }
 
+// UpdateSchema updates the schema of the collection on the querynode.
+func (node *QueryNode) UpdateSchema(ctx context.Context, req *querypb.UpdateSchemaRequest) (*commonpb.Status, error) {
+	defer node.updateDistributionModifyTS()
+
+	// check node healthy
+	if err := node.lifetime.Add(merr.IsHealthy); err != nil {
+		return merr.Status(err), nil
+	}
+	defer node.lifetime.Done()
+
+	log := log.Ctx(ctx).With(
+		zap.Int64("collectionID", req.GetCollectionID()),
+	)
+
+	err := node.manager.Collection.UpdateSchema(req.GetCollectionID(), req.GetSchema())
+	if err != nil {
+		log.Warn("failed to update schema", zap.Error(err))
+	}
+
+	return merr.Status(err), nil
+}
+
 // ReleaseCollection clears all data related to this collection on the querynode
 func (node *QueryNode) ReleaseCollection(ctx context.Context, in *querypb.ReleaseCollectionRequest) (*commonpb.Status, error) {
 	if err := node.lifetime.Add(merr.IsHealthyOrStopping); err != nil {

internal/querynodev2/services_test.go

@@ -2334,6 +2334,44 @@ func (suite *ServiceSuite) TestLoadPartition() {
 	suite.Equal(commonpb.ErrorCode_Success, status.ErrorCode)
 }
 
+func (suite *ServiceSuite) TestUpdateSchema() {
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	req := &querypb.UpdateSchemaRequest{
+		CollectionID: suite.collectionID,
+		Schema:       suite.schema,
+	}
+	manager := suite.node.manager.Collection
+	// reset manager to align default teardown logic
+	defer func() {
+		suite.node.manager.Collection = manager
+	}()
+	mockManager := segments.NewMockCollectionManager(suite.T())
+	suite.node.manager.Collection = mockManager
+
+	suite.Run("normal", func() {
+		mockManager.EXPECT().UpdateSchema(suite.collectionID, suite.schema).Return(nil).Once()
+
+		status, err := suite.node.UpdateSchema(ctx, req)
+		suite.NoError(merr.CheckRPCCall(status, err))
+	})
+
+	suite.Run("manager_returns_error", func() {
+		mockManager.EXPECT().UpdateSchema(suite.collectionID, suite.schema).Return(merr.WrapErrServiceInternal("mocked")).Once()
+
+		status, err := suite.node.UpdateSchema(ctx, req)
+		suite.Error(merr.CheckRPCCall(status, err))
+	})
+
+	suite.Run("abonormal_node", func() {
+		suite.node.UpdateStateCode(commonpb.StateCode_Abnormal)
+		defer suite.node.UpdateStateCode(commonpb.StateCode_Healthy)
+		status, err := suite.node.UpdateSchema(ctx, req)
+		suite.Error(merr.CheckRPCCall(status, err))
+	})
+}
+
 func TestQueryNodeService(t *testing.T) {
 	suite.Run(t, new(ServiceSuite))
 }

internal/rootcoord/add_field_task.go

@@ -88,8 +88,9 @@ func executeAddCollectionFieldTaskSteps(ctx context.Context,
 	req *milvuspb.AddCollectionFieldRequest,
 	ts Timestamp,
 ) error {
-	oldColl := col.Clone()
 	redoTask := newBaseRedoTask(core.stepExecutor)
+
+	oldColl := col.Clone()
 	redoTask.AddSyncStep(&AddCollectionFieldStep{
 		baseStep: baseStep{core: core},
 		oldColl:  oldColl,
@@ -97,6 +98,14 @@ func executeAddCollectionFieldTaskSteps(ctx context.Context,
 		ts:       ts,
 	})
 
+	updatedCollection := col.Clone()
+	updatedCollection.Fields = append(updatedCollection.Fields, newField)
+	redoTask.AddSyncStep(&WriteSchemaChangeWALStep{
+		baseStep:   baseStep{core: core},
+		collection: updatedCollection,
+		ts:         ts,
+	})
+
 	req.CollectionID = oldColl.CollectionID
 	redoTask.AddSyncStep(&BroadcastAlteredCollectionStep{
 		baseStep: baseStep{core: core},

internal/rootcoord/add_field_task_test.go

@@ -28,8 +28,11 @@ import (
 	"github.com/milvus-io/milvus-proto/go-api/v2/commonpb"
 	"github.com/milvus-io/milvus-proto/go-api/v2/milvuspb"
 	"github.com/milvus-io/milvus-proto/go-api/v2/schemapb"
+	"github.com/milvus-io/milvus/internal/distributed/streaming"
 	"github.com/milvus-io/milvus/internal/metastore/model"
+	"github.com/milvus-io/milvus/internal/mocks/distributed/mock_streaming"
 	mockrootcoord "github.com/milvus-io/milvus/internal/rootcoord/mocks"
+	"github.com/milvus-io/milvus/pkg/v2/streaming/util/types"
 	"github.com/milvus-io/milvus/pkg/v2/util/merr"
 )
 
@@ -74,7 +77,29 @@ func Test_AddCollectionFieldTask_Prepare(t *testing.T) {
 }
 
 func Test_AddCollectionFieldTask_Execute(t *testing.T) {
-	t.Run("failed to get collection", func(t *testing.T) {
+	b := mock_streaming.NewMockBroadcast(t)
+	wal := mock_streaming.NewMockWALAccesser(t)
+	wal.EXPECT().Broadcast().Return(b).Maybe()
+	streaming.SetWALForTest(wal)
+
+	testCollection := &model.Collection{
+		CollectionID: int64(1),
+		Fields: []*model.Field{
+			{
+				Name:         "pk",
+				IsPrimaryKey: true,
+				DataType:     schemapb.DataType_Int64,
+			},
+			{
+				Name:     "vec",
+				DataType: schemapb.DataType_FloatVector,
+			},
+		},
+		PhysicalChannelNames: []string{"dml_ch_01", "dml_ch_02"},
+		VirtualChannelNames:  []string{"dml_ch_01", "dml_ch_02"},
+	}
+
+	t.Run("failed_to_get_collection", func(t *testing.T) {
 		metaTable := mockrootcoord.NewIMetaTable(t)
 		metaTable.EXPECT().GetCollectionByName(mock.Anything, mock.Anything, "not_existed_coll", mock.Anything).Return(nil, merr.WrapErrCollectionNotFound("not_existed_coll"))
 		core := newTestCore(withMeta(metaTable))
@@ -86,34 +111,24 @@ func Test_AddCollectionFieldTask_Execute(t *testing.T) {
 			},
 		}
 		err := task.Execute(context.Background())
-		assert.Error(t, err)
+		assert.Error(t, err, "error shall be return when get collection failed")
 	})
 
 	t.Run("add field step failed", func(t *testing.T) {
 		meta := mockrootcoord.NewIMetaTable(t)
-		meta.On("GetCollectionByName",
+		meta.EXPECT().GetCollectionByName(
 			mock.Anything,
 			mock.Anything,
 			mock.Anything,
 			mock.Anything,
-		).Return(&model.Collection{CollectionID: int64(1), Fields: []*model.Field{
-			{
-				Name:         "pk",
-				IsPrimaryKey: true,
-				DataType:     schemapb.DataType_Int64,
-			},
-			{
-				Name:     "vec",
-				DataType: schemapb.DataType_FloatVector,
-			},
-		}}, nil)
-		meta.On("AlterCollection",
+		).Return(testCollection, nil)
+		meta.EXPECT().AlterCollection(
 			mock.Anything,
 			mock.Anything,
 			mock.Anything,
 			mock.Anything,
 		).Return(errors.New("mock"))
-		meta.On("ListAliasesByID", mock.Anything, mock.Anything).Return([]string{})
+		meta.EXPECT().ListAliasesByID(mock.Anything, mock.Anything).Return([]string{})
 		alloc := newMockIDAllocator()
 		core := newTestCore(withValidProxyManager(), withMeta(meta), withIDAllocator(alloc))
 		task := &addCollectionFieldTask{
@@ -132,31 +147,74 @@ func Test_AddCollectionFieldTask_Execute(t *testing.T) {
 		assert.Error(t, err)
 	})
 
-	t.Run("broadcast add field step failed", func(t *testing.T) {
+	t.Run("write_wal_fail", func(t *testing.T) {
 		meta := mockrootcoord.NewIMetaTable(t)
-		meta.On("GetCollectionByName",
+		meta.EXPECT().GetCollectionByName(
 			mock.Anything,
 			mock.Anything,
 			mock.Anything,
 			mock.Anything,
-		).Return(&model.Collection{CollectionID: int64(1), Fields: []*model.Field{
-			{
-				Name:         "pk",
-				IsPrimaryKey: true,
-				DataType:     schemapb.DataType_Int64,
-			},
-			{
-				Name:     "vec",
-				DataType: schemapb.DataType_FloatVector,
-			},
-		}}, nil)
-		meta.On("AlterCollection",
+		).Return(testCollection, nil)
+		meta.EXPECT().AlterCollection(
 			mock.Anything,
 			mock.Anything,
 			mock.Anything,
 			mock.Anything,
 		).Return(nil)
-		meta.On("ListAliasesByID", mock.Anything, mock.Anything).Return([]string{})
+		meta.EXPECT().ListAliasesByID(mock.Anything, mock.Anything).Return([]string{})
+
+		broker := newMockBroker()
+		broker.BroadcastAlteredCollectionFunc = func(ctx context.Context, req *milvuspb.AlterCollectionRequest) error {
+			return errors.New("mock")
+		}
+		alloc := newMockIDAllocator()
+		core := newTestCore(withValidProxyManager(), withMeta(meta), withBroker(broker), withIDAllocator(alloc))
+		task := &addCollectionFieldTask{
+			baseTask: newBaseTask(context.Background(), core),
+			Req: &milvuspb.AddCollectionFieldRequest{
+				Base:           &commonpb.MsgBase{MsgType: commonpb.MsgType_AlterAlias},
+				CollectionName: "coll",
+			},
+			fieldSchema: &schemapb.FieldSchema{
+				Name:     "fid",
+				DataType: schemapb.DataType_Bool,
+				Nullable: true,
+			},
+		}
+
+		t.Run("write_schema_change_fail", func(t *testing.T) {
+			b.EXPECT().Append(mock.Anything, mock.Anything).Return(nil, merr.WrapErrServiceInternal("mocked")).Once()
+
+			err := task.Execute(context.Background())
+			assert.Error(t, err)
+		})
+
+		t.Run("write_flush_failed", func(t *testing.T) {
+			b.EXPECT().Append(mock.Anything, mock.Anything).Return(&types.BroadcastAppendResult{}, nil).Once()
+			b.EXPECT().Append(mock.Anything, mock.Anything).Return(nil, merr.WrapErrServiceInternal("mocked")).Once()
+
+			err := task.Execute(context.Background())
+			assert.Error(t, err)
+		})
+	})
+
+	t.Run("broadcast add field step failed", func(t *testing.T) {
+		b.EXPECT().Append(mock.Anything, mock.Anything).Return(&types.BroadcastAppendResult{}, nil).Times(2)
+
+		meta := mockrootcoord.NewIMetaTable(t)
+		meta.EXPECT().GetCollectionByName(
+			mock.Anything,
+			mock.Anything,
+			mock.Anything,
+			mock.Anything,
+		).Return(testCollection, nil)
+		meta.EXPECT().AlterCollection(
+			mock.Anything,
+			mock.Anything,
+			mock.Anything,
+			mock.Anything,
+		).Return(nil)
+		meta.EXPECT().ListAliasesByID(mock.Anything, mock.Anything).Return([]string{})
 
 		broker := newMockBroker()
 		broker.BroadcastAlteredCollectionFunc = func(ctx context.Context, req *milvuspb.AlterCollectionRequest) error {
@@ -181,30 +239,22 @@ func Test_AddCollectionFieldTask_Execute(t *testing.T) {
 	})
 
 	t.Run("expire cache failed", func(t *testing.T) {
+		b.EXPECT().Append(mock.Anything, mock.Anything).Return(&types.BroadcastAppendResult{}, nil).Times(2)
+
 		meta := mockrootcoord.NewIMetaTable(t)
-		meta.On("GetCollectionByName",
+		meta.EXPECT().GetCollectionByName(
 			mock.Anything,
 			mock.Anything,
 			mock.Anything,
 			mock.Anything,
-		).Return(&model.Collection{CollectionID: int64(1), Fields: []*model.Field{
-			{
-				Name:         "pk",
-				IsPrimaryKey: true,
-				DataType:     schemapb.DataType_Int64,
-			},
-			{
-				Name:     "vec",
-				DataType: schemapb.DataType_FloatVector,
-			},
-		}}, nil)
-		meta.On("AlterCollection",
+		).Return(testCollection, nil)
+		meta.EXPECT().AlterCollection(
 			mock.Anything,
 			mock.Anything,
 			mock.Anything,
 			mock.Anything,
 		).Return(nil)
-		meta.On("ListAliasesByID", mock.Anything, mock.Anything).Return([]string{})
+		meta.EXPECT().ListAliasesByID(mock.Anything, mock.Anything).Return([]string{})
 
 		broker := newMockBroker()
 		broker.BroadcastAlteredCollectionFunc = func(ctx context.Context, req *milvuspb.AlterCollectionRequest) error {
@@ -230,30 +280,22 @@ func Test_AddCollectionFieldTask_Execute(t *testing.T) {
 	})
 
 	t.Run("normal case", func(t *testing.T) {
+		b.EXPECT().Append(mock.Anything, mock.Anything).Return(&types.BroadcastAppendResult{}, nil).Times(2)
+
 		meta := mockrootcoord.NewIMetaTable(t)
-		meta.On("GetCollectionByName",
+		meta.EXPECT().GetCollectionByName(
 			mock.Anything,
 			mock.Anything,
 			mock.Anything,
 			mock.Anything,
-		).Return(&model.Collection{CollectionID: int64(1), Fields: []*model.Field{
-			{
-				Name:         "pk",
-				IsPrimaryKey: true,
-				DataType:     schemapb.DataType_Int64,
-			},
-			{
-				Name:     "vec",
-				DataType: schemapb.DataType_FloatVector,
-			},
-		}}, nil)
-		meta.On("AlterCollection",
+		).Return(testCollection, nil)
+		meta.EXPECT().AlterCollection(
 			mock.Anything,
 			mock.Anything,
 			mock.Anything,
 			mock.Anything,
 		).Return(nil)
-		meta.On("ListAliasesByID", mock.Anything, mock.Anything).Return([]string{})
+		meta.EXPECT().ListAliasesByID(mock.Anything, mock.Anything).Return([]string{})
 
 		broker := newMockBroker()
 		broker.BroadcastAlteredCollectionFunc = func(ctx context.Context, req *milvuspb.AlterCollectionRequest) error {
@@ -264,7 +306,7 @@ func Test_AddCollectionFieldTask_Execute(t *testing.T) {
 		task := &addCollectionFieldTask{
 			baseTask: newBaseTask(context.Background(), core),
 			Req: &milvuspb.AddCollectionFieldRequest{
-				Base:           &commonpb.MsgBase{MsgType: commonpb.MsgType_AlterAlias},
+				Base:           &commonpb.MsgBase{MsgType: commonpb.MsgType_AddCollectionField},
 				CollectionName: "coll",
 			},
 			fieldSchema: &schemapb.FieldSchema{

internal/rootcoord/step.go

@@ -26,11 +26,13 @@ import (
 	"github.com/milvus-io/milvus-proto/go-api/v2/commonpb"
 	"github.com/milvus-io/milvus-proto/go-api/v2/milvuspb"
 	"github.com/milvus-io/milvus-proto/go-api/v2/msgpb"
+	"github.com/milvus-io/milvus-proto/go-api/v2/schemapb"
 	"github.com/milvus-io/milvus/internal/distributed/streaming"
 	"github.com/milvus-io/milvus/internal/metastore/model"
 	"github.com/milvus-io/milvus/internal/util/proxyutil"
 	"github.com/milvus-io/milvus/pkg/v2/log"
 	pb "github.com/milvus-io/milvus/pkg/v2/proto/etcdpb"
+	"github.com/milvus-io/milvus/pkg/v2/proto/messagespb"
 	"github.com/milvus-io/milvus/pkg/v2/streaming/util/message"
 	"github.com/milvus-io/milvus/pkg/v2/util/commonpbutil"
 )
@@ -514,6 +516,77 @@ func (a *AddCollectionFieldStep) Desc() string {
 	return fmt.Sprintf("add field, collectionID: %d, fieldID: %d, ts: %d", a.oldColl.CollectionID, a.newField.FieldID, a.ts)
 }
 
+type WriteSchemaChangeWALStep struct {
+	baseStep
+	collection *model.Collection
+	ts         Timestamp
+}
+
+func (s *WriteSchemaChangeWALStep) Execute(ctx context.Context) ([]nestedStep, error) {
+	vchannels := s.collection.VirtualChannelNames
+	schema := &schemapb.CollectionSchema{
+		Name:               s.collection.Name,
+		Description:        s.collection.Description,
+		AutoID:             s.collection.AutoID,
+		Fields:             model.MarshalFieldModels(s.collection.Fields),
+		Functions:          model.MarshalFunctionModels(s.collection.Functions),
+		EnableDynamicField: s.collection.EnableDynamicField,
+		Properties:         s.collection.Properties,
+	}
+
+	schemaMsg, err := message.NewSchemaChangeMessageBuilderV2().
+		WithBroadcast(vchannels).
+		WithHeader(&message.SchemaChangeMessageHeader{
+			CollectionId: s.collection.CollectionID,
+		}).
+		WithBody(&message.SchemaChangeMessageBody{
+			Schema:   schema,
+			ModifyTs: s.ts,
+		}).BuildBroadcast()
+	if err != nil {
+		return nil, err
+	}
+
+	resp, err := streaming.WAL().Broadcast().Append(ctx, schemaMsg)
+	if err != nil {
+		return nil, err
+	}
+
+	log.Ctx(ctx).Info(
+		"broadcast schema change success",
+		zap.Uint64("broadcastID", resp.BroadcastID),
+		zap.Any("appendResults", resp.AppendResults),
+	)
+
+	flushMsg, err := message.NewManualFlushMessageBuilderV2().
+		WithBroadcast(vchannels).
+		WithHeader(&messagespb.ManualFlushMessageHeader{
+			CollectionId: s.collection.CollectionID,
+			FlushTs:      s.ts,
+		}).
+		WithBody(&message.ManualFlushMessageBody{}).BuildBroadcast()
+	if err != nil {
+		return nil, err
+	}
+
+	resp, err = streaming.WAL().Broadcast().Append(ctx, flushMsg)
+	if err != nil {
+		return nil, err
+	}
+
+	log.Ctx(ctx).Info(
+		"broadcast schema change success",
+		zap.Uint64("broadcastID", resp.BroadcastID),
+		zap.Any("appendResults", resp.AppendResults),
+	)
+
+	return nil, nil
+}
+
+func (s *WriteSchemaChangeWALStep) Desc() string {
+	return fmt.Sprintf("write schema change WALcollectionID: %d, ts: %d", s.collection.CollectionID, s.ts)
+}
+
 type AlterDatabaseStep struct {
 	baseStep
 	oldDB *model.Database

internal/streamingnode/server/flusher/flusherimpl/msg_handler_impl.go

@@ -31,6 +31,7 @@ import (
 	"github.com/milvus-io/milvus/pkg/v2/log"
 	"github.com/milvus-io/milvus/pkg/v2/proto/internalpb"
 	"github.com/milvus-io/milvus/pkg/v2/streaming/util/message"
+	"github.com/milvus-io/milvus/pkg/v2/streaming/util/message/adaptor"
 	"github.com/milvus-io/milvus/pkg/v2/streaming/util/types"
 	"github.com/milvus-io/milvus/pkg/v2/util/funcutil"
 	"github.com/milvus-io/milvus/pkg/v2/util/merr"
@@ -84,7 +85,21 @@ func (impl *msgHandlerImpl) HandleManualFlush(vchannel string, flushMsg message.
 	if err := impl.wbMgr.FlushChannel(context.Background(), vchannel, flushMsg.Header().GetFlushTs()); err != nil {
 		return errors.Wrap(err, "failed to flush channel")
 	}
-	return nil
+	broadcastID := flushMsg.BroadcastHeader().BroadcastID
+	if broadcastID == 0 {
+		return nil
+	}
+	return streaming.WAL().Broadcast().Ack(context.Background(), types.BroadcastAckRequest{
+		BroadcastID: flushMsg.BroadcastHeader().BroadcastID,
+		VChannel:    vchannel,
+	})
+}
+
+func (impl *msgHandlerImpl) HandleSchemaChange(ctx context.Context, vchannel string, msg *adaptor.SchemaChangeMessageBody) error {
+	return streaming.WAL().Broadcast().Ack(ctx, types.BroadcastAckRequest{
+		BroadcastID: msg.BroadcastID,
+		VChannel:    vchannel,
+	})
 }
 
 func (impl *msgHandlerImpl) HandleImport(ctx context.Context, vchannel string, importMsg *msgpb.ImportMsg) error {

internal/streamingnode/server/wal/adaptor/initializing.go

@@ -29,7 +29,7 @@ func buildInterceptorParams(ctx context.Context, underlyingWALImpls walimpls.WAL
 
 	capacity := int(paramtable.Get().StreamingCfg.WALWriteAheadBufferCapacity.GetAsSize())
 	keepalive := paramtable.Get().StreamingCfg.WALWriteAheadBufferKeepalive.GetAsDurationByParse()
-	writeAheadBuffer := wab.NewWirteAheadBuffer(
+	writeAheadBuffer := wab.NewWriteAheadBuffer(
 		underlyingWALImpls.Channel().Name,
 		resource.Resource().Logger().With(),
 		capacity,

internal/streamingnode/server/wal/interceptors/timetick/timetick_sync_operator_test.go

@@ -48,7 +48,7 @@ func TestTimeTickSyncOperator(t *testing.T) {
 		WAL:                  walFuture,
 		InitializedTimeTick:  ts,
 		InitializedMessageID: msgID,
-		WriteAheadBuffer: wab.NewWirteAheadBuffer(
+		WriteAheadBuffer: wab.NewWriteAheadBuffer(
 			channel.Name,
 			resource.Resource().Logger().With(),
 			1024,

internal/streamingnode/server/wal/interceptors/wab/write_ahead_buffer.go

@@ -24,7 +24,7 @@ type ROWriteAheadBuffer interface {
 }
 
 // NewWriteAheadBuffer creates a new WriteAheadBuffer.
-func NewWirteAheadBuffer(
+func NewWriteAheadBuffer(
 	pchannel string,
 	logger *log.MLogger,
 	capacity int,

internal/streamingnode/server/wal/interceptors/wab/write_ahead_buffer_test.go

@@ -17,7 +17,7 @@ import (
 
 func TestWriteAheadBufferWithOnlyTrivialTimeTick(t *testing.T) {
 	ctx := context.Background()
-	wb := NewWirteAheadBuffer("pchannel", log.With(), 5*1024*1024, 30*time.Second, createTimeTickMessage(0))
+	wb := NewWriteAheadBuffer("pchannel", log.With(), 5*1024*1024, 30*time.Second, createTimeTickMessage(0))
 
 	// Test timeout
 	ctx, cancel := context.WithTimeout(ctx, 1*time.Millisecond)
@@ -81,7 +81,7 @@ func TestWriteAheadBufferWithOnlyTrivialTimeTick(t *testing.T) {
 func TestWriteAheadBuffer(t *testing.T) {
 	// Concurrent add message into bufffer and make syncup.
 	// The reader should never lost any message if no eviction happen.
-	wb := NewWirteAheadBuffer("pchannel", log.With(), 5*1024*1024, 30*time.Second, createTimeTickMessage(1))
+	wb := NewWriteAheadBuffer("pchannel", log.With(), 5*1024*1024, 30*time.Second, createTimeTickMessage(1))
 	expectedLastTimeTick := uint64(10000)
 	ch := make(chan struct{})
 	totalCnt := 0
@@ -183,7 +183,7 @@ func TestWriteAheadBuffer(t *testing.T) {
 }
 
 func TestWriteAheadBufferEviction(t *testing.T) {
-	wb := NewWirteAheadBuffer("pchannel", log.With(), 5*1024*1024, 50*time.Millisecond, createTimeTickMessage(0))
+	wb := NewWriteAheadBuffer("pchannel", log.With(), 5*1024*1024, 50*time.Millisecond, createTimeTickMessage(0))
 
 	msgs := make([]message.ImmutableMessage, 0)
 	for i := 1; i < 100; i++ {

internal/util/mock/grpc_querynode_client.go

@@ -134,6 +134,10 @@ func (m *GrpcQueryNodeClient) DeleteBatch(ctx context.Context, in *querypb.Delet
 	return &querypb.DeleteBatchResponse{}, m.Err
 }
 
+func (m *GrpcQueryNodeClient) UpdateSchema(ctx context.Context, in *querypb.UpdateSchemaRequest, opts ...grpc.CallOption) (*commonpb.Status, error) {
+	return &commonpb.Status{}, m.Err
+}
+
 func (m *GrpcQueryNodeClient) Close() error {
 	return m.Err
 }

internal/util/pipeline/stream_pipeline.go

@@ -114,7 +114,8 @@ func (p *streamPipeline) ConsumeMsgStream(ctx context.Context, position *msgpb.M
 				// only consume messages with timestamp >= position timestamp
 				options.DeliverFilterTimeTickGTE(position.GetTimestamp()),
 				// only consume insert and delete messages
-				options.DeliverFilterMessageType(message.MessageTypeInsert, message.MessageTypeDelete),
+				// also schema change message to notify schema change events
+				options.DeliverFilterMessageType(message.MessageTypeInsert, message.MessageTypeDelete, message.MessageTypeSchemaChange),
 			},
 			MessageHandler: handler,
 		})

internal/util/segcore/collection.go

@@ -16,6 +16,7 @@ import (
 
 	"github.com/milvus-io/milvus-proto/go-api/v2/schemapb"
 	"github.com/milvus-io/milvus/pkg/v2/proto/segcorepb"
+	"github.com/milvus-io/milvus/pkg/v2/util/merr"
 )
 
 // CreateCCollectionRequest is a request to create a CCollection.
@@ -85,6 +86,20 @@ func (c *CCollection) IndexMeta() *segcorepb.CollectionIndexMeta {
 	return c.indexMeta
 }
 
+func (c *CCollection) UpdateSchema(sch *schemapb.CollectionSchema) error {
+	if sch == nil {
+		return merr.WrapErrServiceInternal("update collection schema with nil")
+	}
+
+	schemaBlob, err := proto.Marshal(sch)
+	if err != nil {
+		return err
+	}
+
+	status := C.UpdateSchema(c.ptr, unsafe.Pointer(&schemaBlob[0]), (C.int64_t)(len(schemaBlob)))
+	return ConsumeCStatusIntoError(&status)
+}
+
 // Release releases the underlying collection
 func (c *CCollection) Release() {
 	C.DeleteCollection(c.ptr)

internal/util/wrappers/qn_wrapper.go

@@ -152,6 +152,10 @@ func (qn *qnServerWrapper) DeleteBatch(ctx context.Context, in *querypb.DeleteBa
 	return qn.QueryNode.DeleteBatch(ctx, in)
 }
 
+func (qn *qnServerWrapper) UpdateSchema(ctx context.Context, in *querypb.UpdateSchemaRequest, _ ...grpc.CallOption) (*commonpb.Status, error) {
+	return qn.QueryNode.UpdateSchema(ctx, in)
+}
+
 func WrapQueryNodeServerAsClient(qn types.QueryNode) types.QueryNodeClient {
 	return &qnServerWrapper{
 		QueryNode: qn,

pkg/proto/messages.proto

@@ -4,6 +4,8 @@ package milvus.proto.messages;
 
 option go_package = "github.com/milvus-io/milvus/pkg/v2/proto/messagespb";
 
+import "schema.proto";
+
 // MessageID is the unique identifier of a message.
 message MessageID {
     string id = 1;
@@ -36,6 +38,7 @@ enum MessageType {
     ManualFlush      = 9;
     CreateSegment    = 10;
     Import           = 11;
+    SchemaChange     = 12;
     // begin transaction message is only used for transaction, once a begin
     // transaction message is received, all messages combined with the
     // transaction message cannot be consumed until a CommitTxn message
@@ -208,6 +211,17 @@ message TxnMessageHeader {}
 
 message ImportMessageHeader {}
 
+// SchemaChangeMessageHeader is the header of CollectionSchema update message.
+message SchemaChangeMessageHeader{
+    int64 collection_id = 1;
+}
+
+// SchemaChangeMessageBody is the body of CollectionSchema update message.
+message SchemaChangeMessageBody{
+    schema.CollectionSchema schema = 1;
+    uint64 modify_ts = 2;
+}
+
 ///
 /// Message Extra Response
 /// Used to add extra information when response to the client.

pkg/proto/messagespb/messages.pb.go

@@ -7,6 +7,7 @@
 package messagespb
 
 import (
+	schemapb "github.com/milvus-io/milvus-proto/go-api/v2/schemapb"
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
 	reflect "reflect"
@@ -36,6 +37,7 @@ const (
 	MessageType_ManualFlush      MessageType = 9
 	MessageType_CreateSegment    MessageType = 10
 	MessageType_Import           MessageType = 11
+	MessageType_SchemaChange     MessageType = 12
 	// begin transaction message is only used for transaction, once a begin
 	// transaction message is received, all messages combined with the
 	// transaction message cannot be consumed until a CommitTxn message
@@ -74,6 +76,7 @@ var (
 		9:   "ManualFlush",
 		10:  "CreateSegment",
 		11:  "Import",
+		12:  "SchemaChange",
 		900: "BeginTxn",
 		901: "CommitTxn",
 		902: "RollbackTxn",
@@ -92,6 +95,7 @@ var (
 		"ManualFlush":      9,
 		"CreateSegment":    10,
 		"Import":           11,
+		"SchemaChange":     12,
 		"BeginTxn":         900,
 		"CommitTxn":        901,
 		"RollbackTxn":      902,
@@ -1623,6 +1627,110 @@ func (*ImportMessageHeader) Descriptor() ([]byte, []int) {
 	return file_messages_proto_rawDescGZIP(), []int{27}
 }
 
+// SchemaChangeMessageHeader is the header of CollectionSchema update message.
+type SchemaChangeMessageHeader struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	CollectionId int64 `protobuf:"varint,1,opt,name=collection_id,json=collectionId,proto3" json:"collection_id,omitempty"`
+}
+
+func (x *SchemaChangeMessageHeader) Reset() {
+	*x = SchemaChangeMessageHeader{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_messages_proto_msgTypes[28]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *SchemaChangeMessageHeader) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*SchemaChangeMessageHeader) ProtoMessage() {}
+
+func (x *SchemaChangeMessageHeader) ProtoReflect() protoreflect.Message {
+	mi := &file_messages_proto_msgTypes[28]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use SchemaChangeMessageHeader.ProtoReflect.Descriptor instead.
+func (*SchemaChangeMessageHeader) Descriptor() ([]byte, []int) {
+	return file_messages_proto_rawDescGZIP(), []int{28}
+}
+
+func (x *SchemaChangeMessageHeader) GetCollectionId() int64 {
+	if x != nil {
+		return x.CollectionId
+	}
+	return 0
+}
+
+// SchemaChangeMessageBody is the body of CollectionSchema update message.
+type SchemaChangeMessageBody struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Schema   *schemapb.CollectionSchema `protobuf:"bytes,1,opt,name=schema,proto3" json:"schema,omitempty"`
+	ModifyTs uint64                     `protobuf:"varint,2,opt,name=modify_ts,json=modifyTs,proto3" json:"modify_ts,omitempty"`
+}
+
+func (x *SchemaChangeMessageBody) Reset() {
+	*x = SchemaChangeMessageBody{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_messages_proto_msgTypes[29]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *SchemaChangeMessageBody) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*SchemaChangeMessageBody) ProtoMessage() {}
+
+func (x *SchemaChangeMessageBody) ProtoReflect() protoreflect.Message {
+	mi := &file_messages_proto_msgTypes[29]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use SchemaChangeMessageBody.ProtoReflect.Descriptor instead.
+func (*SchemaChangeMessageBody) Descriptor() ([]byte, []int) {
+	return file_messages_proto_rawDescGZIP(), []int{29}
+}
+
+func (x *SchemaChangeMessageBody) GetSchema() *schemapb.CollectionSchema {
+	if x != nil {
+		return x.Schema
+	}
+	return nil
+}
+
+func (x *SchemaChangeMessageBody) GetModifyTs() uint64 {
+	if x != nil {
+		return x.ModifyTs
+	}
+	return 0
+}
+
 // ManualFlushExtraResponse is the extra response of manual flush message.
 type ManualFlushExtraResponse struct {
 	state         protoimpl.MessageState
@@ -1635,7 +1743,7 @@ type ManualFlushExtraResponse struct {
 func (x *ManualFlushExtraResponse) Reset() {
 	*x = ManualFlushExtraResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_messages_proto_msgTypes[28]
+		mi := &file_messages_proto_msgTypes[30]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1648,7 +1756,7 @@ func (x *ManualFlushExtraResponse) String() string {
 func (*ManualFlushExtraResponse) ProtoMessage() {}
 
 func (x *ManualFlushExtraResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_messages_proto_msgTypes[28]
+	mi := &file_messages_proto_msgTypes[30]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1661,7 +1769,7 @@ func (x *ManualFlushExtraResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use ManualFlushExtraResponse.ProtoReflect.Descriptor instead.
 func (*ManualFlushExtraResponse) Descriptor() ([]byte, []int) {
-	return file_messages_proto_rawDescGZIP(), []int{28}
+	return file_messages_proto_rawDescGZIP(), []int{30}
 }
 
 func (x *ManualFlushExtraResponse) GetSegmentIds() []int64 {
@@ -1689,7 +1797,7 @@ type TxnContext struct {
 func (x *TxnContext) Reset() {
 	*x = TxnContext{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_messages_proto_msgTypes[29]
+		mi := &file_messages_proto_msgTypes[31]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1702,7 +1810,7 @@ func (x *TxnContext) String() string {
 func (*TxnContext) ProtoMessage() {}
 
 func (x *TxnContext) ProtoReflect() protoreflect.Message {
-	mi := &file_messages_proto_msgTypes[29]
+	mi := &file_messages_proto_msgTypes[31]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1715,7 +1823,7 @@ func (x *TxnContext) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use TxnContext.ProtoReflect.Descriptor instead.
 func (*TxnContext) Descriptor() ([]byte, []int) {
-	return file_messages_proto_rawDescGZIP(), []int{29}
+	return file_messages_proto_rawDescGZIP(), []int{31}
 }
 
 func (x *TxnContext) GetTxnId() int64 {
@@ -1745,7 +1853,7 @@ type RMQMessageLayout struct {
 func (x *RMQMessageLayout) Reset() {
 	*x = RMQMessageLayout{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_messages_proto_msgTypes[30]
+		mi := &file_messages_proto_msgTypes[32]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1758,7 +1866,7 @@ func (x *RMQMessageLayout) String() string {
 func (*RMQMessageLayout) ProtoMessage() {}
 
 func (x *RMQMessageLayout) ProtoReflect() protoreflect.Message {
-	mi := &file_messages_proto_msgTypes[30]
+	mi := &file_messages_proto_msgTypes[32]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1771,7 +1879,7 @@ func (x *RMQMessageLayout) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use RMQMessageLayout.ProtoReflect.Descriptor instead.
 func (*RMQMessageLayout) Descriptor() ([]byte, []int) {
-	return file_messages_proto_rawDescGZIP(), []int{30}
+	return file_messages_proto_rawDescGZIP(), []int{32}
 }
 
 func (x *RMQMessageLayout) GetPayload() []byte {
@@ -1802,7 +1910,7 @@ type BroadcastHeader struct {
 func (x *BroadcastHeader) Reset() {
 	*x = BroadcastHeader{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_messages_proto_msgTypes[31]
+		mi := &file_messages_proto_msgTypes[33]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1815,7 +1923,7 @@ func (x *BroadcastHeader) String() string {
 func (*BroadcastHeader) ProtoMessage() {}
 
 func (x *BroadcastHeader) ProtoReflect() protoreflect.Message {
-	mi := &file_messages_proto_msgTypes[31]
+	mi := &file_messages_proto_msgTypes[33]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1828,7 +1936,7 @@ func (x *BroadcastHeader) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use BroadcastHeader.ProtoReflect.Descriptor instead.
 func (*BroadcastHeader) Descriptor() ([]byte, []int) {
-	return file_messages_proto_rawDescGZIP(), []int{31}
+	return file_messages_proto_rawDescGZIP(), []int{33}
 }
 
 func (x *BroadcastHeader) GetBroadcastId() uint64 {
@@ -1867,7 +1975,7 @@ type ResourceKey struct {
 func (x *ResourceKey) Reset() {
 	*x = ResourceKey{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_messages_proto_msgTypes[32]
+		mi := &file_messages_proto_msgTypes[34]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1880,7 +1988,7 @@ func (x *ResourceKey) String() string {
 func (*ResourceKey) ProtoMessage() {}
 
 func (x *ResourceKey) ProtoReflect() protoreflect.Message {
-	mi := &file_messages_proto_msgTypes[32]
+	mi := &file_messages_proto_msgTypes[34]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1893,7 +2001,7 @@ func (x *ResourceKey) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use ResourceKey.ProtoReflect.Descriptor instead.
 func (*ResourceKey) Descriptor() ([]byte, []int) {
-	return file_messages_proto_rawDescGZIP(), []int{32}
+	return file_messages_proto_rawDescGZIP(), []int{34}
 }
 
 func (x *ResourceKey) GetDomain() ResourceDomain {
@@ -1924,7 +2032,7 @@ type CipherHeader struct {
 func (x *CipherHeader) Reset() {
 	*x = CipherHeader{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_messages_proto_msgTypes[33]
+		mi := &file_messages_proto_msgTypes[35]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1937,7 +2045,7 @@ func (x *CipherHeader) String() string {
 func (*CipherHeader) ProtoMessage() {}
 
 func (x *CipherHeader) ProtoReflect() protoreflect.Message {
-	mi := &file_messages_proto_msgTypes[33]
+	mi := &file_messages_proto_msgTypes[35]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1950,7 +2058,7 @@ func (x *CipherHeader) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use CipherHeader.ProtoReflect.Descriptor instead.
 func (*CipherHeader) Descriptor() ([]byte, []int) {
-	return file_messages_proto_rawDescGZIP(), []int{33}
+	return file_messages_proto_rawDescGZIP(), []int{35}
 }
 
 func (x *CipherHeader) GetEzId() int64 {
@@ -1979,223 +2087,237 @@ var File_messages_proto protoreflect.FileDescriptor
 var file_messages_proto_rawDesc = []byte{
 	0x0a, 0x0e, 0x6d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65, 0x73, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f,
 	0x12, 0x15, 0x6d, 0x69, 0x6c, 0x76, 0x75, 0x73, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2e, 0x6d,
-	0x65, 0x73, 0x73, 0x61, 0x67, 0x65, 0x73, 0x22, 0x1b, 0x0a, 0x09, 0x4d, 0x65, 0x73, 0x73, 0x61,
-	0x67, 0x65, 0x49, 0x44, 0x12, 0x0e, 0x0a, 0x02, 0x69, 0x64, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09,
-	0x52, 0x02, 0x69, 0x64, 0x22, 0xb2, 0x01, 0x0a, 0x07, 0x4d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65,
-	0x12, 0x18, 0x0a, 0x07, 0x70, 0x61, 0x79, 0x6c, 0x6f, 0x61, 0x64, 0x18, 0x01, 0x20, 0x01, 0x28,
-	0x0c, 0x52, 0x07, 0x70, 0x61, 0x79, 0x6c, 0x6f, 0x61, 0x64, 0x12, 0x4e, 0x0a, 0x0a, 0x70, 0x72,
-	0x6f, 0x70, 0x65, 0x72, 0x74, 0x69, 0x65, 0x73, 0x18, 0x02, 0x20, 0x03, 0x28, 0x0b, 0x32, 0x2e,
-	0x2e, 0x6d, 0x69, 0x6c, 0x76, 0x75, 0x73, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2e, 0x6d, 0x65,
-	0x73, 0x73, 0x61, 0x67, 0x65, 0x73, 0x2e, 0x4d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65, 0x2e, 0x50,
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 }
 
 var (
@@ -2211,7 +2333,7 @@ func file_messages_proto_rawDescGZIP() []byte {
 }
 
 var file_messages_proto_enumTypes = make([]protoimpl.EnumInfo, 3)
-var file_messages_proto_msgTypes = make([]protoimpl.MessageInfo, 37)
+var file_messages_proto_msgTypes = make([]protoimpl.MessageInfo, 39)
 var file_messages_proto_goTypes = []interface{}{
 	(MessageType)(0),                      // 0: milvus.proto.messages.MessageType
 	(TxnState)(0),                         // 1: milvus.proto.messages.TxnState
@@ -2244,32 +2366,36 @@ var file_messages_proto_goTypes = []interface{}{
 	(*RollbackTxnMessageHeader)(nil),      // 28: milvus.proto.messages.RollbackTxnMessageHeader
 	(*TxnMessageHeader)(nil),              // 29: milvus.proto.messages.TxnMessageHeader
 	(*ImportMessageHeader)(nil),           // 30: milvus.proto.messages.ImportMessageHeader
-	(*ManualFlushExtraResponse)(nil),      // 31: milvus.proto.messages.ManualFlushExtraResponse
-	(*TxnContext)(nil),                    // 32: milvus.proto.messages.TxnContext
-	(*RMQMessageLayout)(nil),              // 33: milvus.proto.messages.RMQMessageLayout
-	(*BroadcastHeader)(nil),               // 34: milvus.proto.messages.BroadcastHeader
-	(*ResourceKey)(nil),                   // 35: milvus.proto.messages.ResourceKey
-	(*CipherHeader)(nil),                  // 36: milvus.proto.messages.CipherHeader
-	nil,                                   // 37: milvus.proto.messages.Message.PropertiesEntry
-	nil,                                   // 38: milvus.proto.messages.ImmutableMessage.PropertiesEntry
-	nil,                                   // 39: milvus.proto.messages.RMQMessageLayout.PropertiesEntry
+	(*SchemaChangeMessageHeader)(nil),     // 31: milvus.proto.messages.SchemaChangeMessageHeader
+	(*SchemaChangeMessageBody)(nil),       // 32: milvus.proto.messages.SchemaChangeMessageBody
+	(*ManualFlushExtraResponse)(nil),      // 33: milvus.proto.messages.ManualFlushExtraResponse
+	(*TxnContext)(nil),                    // 34: milvus.proto.messages.TxnContext
+	(*RMQMessageLayout)(nil),              // 35: milvus.proto.messages.RMQMessageLayout
+	(*BroadcastHeader)(nil),               // 36: milvus.proto.messages.BroadcastHeader
+	(*ResourceKey)(nil),                   // 37: milvus.proto.messages.ResourceKey
+	(*CipherHeader)(nil),                  // 38: milvus.proto.messages.CipherHeader
+	nil,                                   // 39: milvus.proto.messages.Message.PropertiesEntry
+	nil,                                   // 40: milvus.proto.messages.ImmutableMessage.PropertiesEntry
+	nil,                                   // 41: milvus.proto.messages.RMQMessageLayout.PropertiesEntry
+	(*schemapb.CollectionSchema)(nil),     // 42: milvus.proto.schema.CollectionSchema
 }
 var file_messages_proto_depIdxs = []int32{
-	37, // 0: milvus.proto.messages.Message.properties:type_name -> milvus.proto.messages.Message.PropertiesEntry
+	39, // 0: milvus.proto.messages.Message.properties:type_name -> milvus.proto.messages.Message.PropertiesEntry
 	3,  // 1: milvus.proto.messages.ImmutableMessage.id:type_name -> milvus.proto.messages.MessageID
-	38, // 2: milvus.proto.messages.ImmutableMessage.properties:type_name -> milvus.proto.messages.ImmutableMessage.PropertiesEntry
+	40, // 2: milvus.proto.messages.ImmutableMessage.properties:type_name -> milvus.proto.messages.ImmutableMessage.PropertiesEntry
 	9,  // 3: milvus.proto.messages.CreateSegmentMessageBody.segments:type_name -> milvus.proto.messages.CreateSegmentInfo
 	4,  // 4: milvus.proto.messages.TxnMessageBody.messages:type_name -> milvus.proto.messages.Message
 	16, // 5: milvus.proto.messages.InsertMessageHeader.partitions:type_name -> milvus.proto.messages.PartitionSegmentAssignment
 	17, // 6: milvus.proto.messages.PartitionSegmentAssignment.segment_assignment:type_name -> milvus.proto.messages.SegmentAssignment
-	39, // 7: milvus.proto.messages.RMQMessageLayout.properties:type_name -> milvus.proto.messages.RMQMessageLayout.PropertiesEntry
-	35, // 8: milvus.proto.messages.BroadcastHeader.Resource_keys:type_name -> milvus.proto.messages.ResourceKey
-	2,  // 9: milvus.proto.messages.ResourceKey.domain:type_name -> milvus.proto.messages.ResourceDomain
-	10, // [10:10] is the sub-list for method output_type
-	10, // [10:10] is the sub-list for method input_type
-	10, // [10:10] is the sub-list for extension type_name
-	10, // [10:10] is the sub-list for extension extendee
-	0,  // [0:10] is the sub-list for field type_name
+	42, // 7: milvus.proto.messages.SchemaChangeMessageBody.schema:type_name -> milvus.proto.schema.CollectionSchema
+	41, // 8: milvus.proto.messages.RMQMessageLayout.properties:type_name -> milvus.proto.messages.RMQMessageLayout.PropertiesEntry
+	37, // 9: milvus.proto.messages.BroadcastHeader.Resource_keys:type_name -> milvus.proto.messages.ResourceKey
+	2,  // 10: milvus.proto.messages.ResourceKey.domain:type_name -> milvus.proto.messages.ResourceDomain
+	11, // [11:11] is the sub-list for method output_type
+	11, // [11:11] is the sub-list for method input_type
+	11, // [11:11] is the sub-list for extension type_name
+	11, // [11:11] is the sub-list for extension extendee
+	0,  // [0:11] is the sub-list for field type_name
 }
 
 func init() { file_messages_proto_init() }
@@ -2615,7 +2741,7 @@ func file_messages_proto_init() {
 			}
 		}
 		file_messages_proto_msgTypes[28].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ManualFlushExtraResponse); i {
+			switch v := v.(*SchemaChangeMessageHeader); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2627,7 +2753,7 @@ func file_messages_proto_init() {
 			}
 		}
 		file_messages_proto_msgTypes[29].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*TxnContext); i {
+			switch v := v.(*SchemaChangeMessageBody); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2639,7 +2765,7 @@ func file_messages_proto_init() {
 			}
 		}
 		file_messages_proto_msgTypes[30].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*RMQMessageLayout); i {
+			switch v := v.(*ManualFlushExtraResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2651,7 +2777,7 @@ func file_messages_proto_init() {
 			}
 		}
 		file_messages_proto_msgTypes[31].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*BroadcastHeader); i {
+			switch v := v.(*TxnContext); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2663,7 +2789,7 @@ func file_messages_proto_init() {
 			}
 		}
 		file_messages_proto_msgTypes[32].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ResourceKey); i {
+			switch v := v.(*RMQMessageLayout); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2675,6 +2801,30 @@ func file_messages_proto_init() {
 			}
 		}
 		file_messages_proto_msgTypes[33].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*BroadcastHeader); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_messages_proto_msgTypes[34].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ResourceKey); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_messages_proto_msgTypes[35].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*CipherHeader); i {
 			case 0:
 				return &v.state
@@ -2693,7 +2843,7 @@ func file_messages_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_messages_proto_rawDesc,
 			NumEnums:      3,
-			NumMessages:   37,
+			NumMessages:   39,
 			NumExtensions: 0,
 			NumServices:   0,
 		},

pkg/proto/query_coord.proto

@@ -167,6 +167,7 @@ service QueryNode {
     // it's basically same as `Delete` but cost less memory pressure.
     rpc DeleteBatch(DeleteBatchRequest) returns (DeleteBatchResponse) {
     } 
+    rpc UpdateSchema(UpdateSchemaRequest) returns (common.Status) {}
 }
 
 // --------------------QueryCoord grpc request and response proto------------------
@@ -944,3 +945,9 @@ message UpdateLoadConfigRequest {
     int32 replica_number = 4;
     repeated string resource_groups = 5;
 }
+
+message UpdateSchemaRequest {
+    common.MsgBase base = 1;
+    int64 collectionID = 2;
+    schema.CollectionSchema schema = 3;
+}

pkg/proto/querypb/query_coord_grpc.pb.go

@@ -1436,6 +1436,7 @@ const (
 	QueryNode_SyncDistribution_FullMethodName     = "/milvus.proto.query.QueryNode/SyncDistribution"
 	QueryNode_Delete_FullMethodName               = "/milvus.proto.query.QueryNode/Delete"
 	QueryNode_DeleteBatch_FullMethodName          = "/milvus.proto.query.QueryNode/DeleteBatch"
+	QueryNode_UpdateSchema_FullMethodName         = "/milvus.proto.query.QueryNode/UpdateSchema"
 )
 
 // QueryNodeClient is the client API for QueryNode service.
@@ -1470,6 +1471,7 @@ type QueryNodeClient interface {
 	// DeleteBatch is the API to apply same delete data into multiple segments.
 	// it's basically same as `Delete` but cost less memory pressure.
 	DeleteBatch(ctx context.Context, in *DeleteBatchRequest, opts ...grpc.CallOption) (*DeleteBatchResponse, error)
+	UpdateSchema(ctx context.Context, in *UpdateSchemaRequest, opts ...grpc.CallOption) (*commonpb.Status, error)
 }
 
 type queryNodeClient struct {
@@ -1751,6 +1753,15 @@ func (c *queryNodeClient) DeleteBatch(ctx context.Context, in *DeleteBatchReques
 	return out, nil
 }
 
+func (c *queryNodeClient) UpdateSchema(ctx context.Context, in *UpdateSchemaRequest, opts ...grpc.CallOption) (*commonpb.Status, error) {
+	out := new(commonpb.Status)
+	err := c.cc.Invoke(ctx, QueryNode_UpdateSchema_FullMethodName, in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // QueryNodeServer is the server API for QueryNode service.
 // All implementations should embed UnimplementedQueryNodeServer
 // for forward compatibility
@@ -1783,6 +1794,7 @@ type QueryNodeServer interface {
 	// DeleteBatch is the API to apply same delete data into multiple segments.
 	// it's basically same as `Delete` but cost less memory pressure.
 	DeleteBatch(context.Context, *DeleteBatchRequest) (*DeleteBatchResponse, error)
+	UpdateSchema(context.Context, *UpdateSchemaRequest) (*commonpb.Status, error)
 }
 
 // UnimplementedQueryNodeServer should be embedded to have forward compatible implementations.
@@ -1864,6 +1876,9 @@ func (UnimplementedQueryNodeServer) Delete(context.Context, *DeleteRequest) (*co
 func (UnimplementedQueryNodeServer) DeleteBatch(context.Context, *DeleteBatchRequest) (*DeleteBatchResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method DeleteBatch not implemented")
 }
+func (UnimplementedQueryNodeServer) UpdateSchema(context.Context, *UpdateSchemaRequest) (*commonpb.Status, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method UpdateSchema not implemented")
+}
 
 // UnsafeQueryNodeServer may be embedded to opt out of forward compatibility for this service.
 // Use of this interface is not recommended, as added methods to QueryNodeServer will
@@ -2332,6 +2347,24 @@ func _QueryNode_DeleteBatch_Handler(srv interface{}, ctx context.Context, dec fu
 	return interceptor(ctx, in, info, handler)
 }
 
+func _QueryNode_UpdateSchema_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(UpdateSchemaRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(QueryNodeServer).UpdateSchema(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: QueryNode_UpdateSchema_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(QueryNodeServer).UpdateSchema(ctx, req.(*UpdateSchemaRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 // QueryNode_ServiceDesc is the grpc.ServiceDesc for QueryNode service.
 // It's only intended for direct use with grpc.RegisterService,
 // and not to be introspected or modified (even as a copy)
@@ -2431,6 +2464,10 @@ var QueryNode_ServiceDesc = grpc.ServiceDesc{
 			MethodName: "DeleteBatch",
 			Handler:    _QueryNode_DeleteBatch_Handler,
 		},
+		{
+			MethodName: "UpdateSchema",
+			Handler:    _QueryNode_UpdateSchema_Handler,
+		},
 	},
 	Streams: []grpc.StreamDesc{
 		{

pkg/streaming/util/message/adaptor/message.go

@@ -135,6 +135,8 @@ func fromMessageToTsMsgV2(msg message.ImmutableMessage) (msgstream.TsMsg, error)
 		tsMsg, err = NewManualFlushMessageBody(msg)
 	case message.MessageTypeCreateSegment:
 		tsMsg, err = NewCreateSegmentMessageBody(msg)
+	case message.MessageTypeSchemaChange:
+		tsMsg, err = NewSchemaChangeMessageBody(msg)
 	default:
 		panic("unsupported message type")
 	}

pkg/streaming/util/message/adaptor/message_type.go

@@ -17,6 +17,7 @@ var messageTypeToCommonpbMsgType = map[message.MessageType]commonpb.MsgType{
 	message.MessageTypeCreatePartition:  commonpb.MsgType_CreatePartition,
 	message.MessageTypeDropPartition:    commonpb.MsgType_DropPartition,
 	message.MessageTypeImport:           commonpb.MsgType_Import,
+	message.MessageTypeSchemaChange:     commonpb.MsgType_AddCollectionField, // TODO change to schema change
 }
 
 // MustGetCommonpbMsgTypeFromMessageType returns the commonpb.MsgType from message.MessageType.

pkg/streaming/util/message/adaptor/ts_msg_newer.go

@@ -121,3 +121,29 @@ func NewManualFlushMessageBody(msg message.ImmutableMessage) (msgstream.TsMsg, e
 		ManualFlushMessage: flushMsg,
 	}, nil
 }
+
+type SchemaChangeMessageBody struct {
+	*tsMsgImpl
+	SchemaChangeMessage message.ImmutableSchemaChangeMessageV2
+	BroadcastID         uint64
+}
+
+func NewSchemaChangeMessageBody(msg message.ImmutableMessage) (msgstream.TsMsg, error) {
+	schChgMsg, err := message.AsImmutableCollectionSchemaChangeV2(msg)
+	if err != nil {
+		return nil, err
+	}
+	return &SchemaChangeMessageBody{
+		tsMsgImpl: &tsMsgImpl{
+			BaseMsg: msgstream.BaseMsg{
+				BeginTimestamp: msg.TimeTick(),
+				EndTimestamp:   msg.TimeTick(),
+			},
+			ts:      msg.TimeTick(),
+			sz:      msg.EstimateSize(),
+			msgType: MustGetCommonpbMsgTypeFromMessageType(msg.MessageType()),
+		},
+		SchemaChangeMessage: schChgMsg,
+		BroadcastID:         msg.BroadcastHeader().BroadcastID,
+	}, nil
+}

pkg/streaming/util/message/broadcast.go

@@ -9,13 +9,13 @@ import (
 
 // newBroadcastHeaderFromProto creates a BroadcastHeader from proto.
 func newBroadcastHeaderFromProto(proto *messagespb.BroadcastHeader) *BroadcastHeader {
-	rks := make(typeutil.Set[ResourceKey], len(proto.ResourceKeys))
-	for _, key := range proto.ResourceKeys {
+	rks := make(typeutil.Set[ResourceKey], len(proto.GetResourceKeys()))
+	for _, key := range proto.GetResourceKeys() {
 		rks.Insert(NewResourceKeyFromProto(key))
 	}
 	return &BroadcastHeader{
-		BroadcastID:  proto.BroadcastId,
-		VChannels:    proto.Vchannels,
+		BroadcastID:  proto.GetBroadcastId(),
+		VChannels:    proto.GetVchannels(),
 		ResourceKeys: rks,
 	}
 }

pkg/streaming/util/message/builder.go

@@ -68,6 +68,7 @@ var (
 	NewBeginTxnMessageBuilderV2         = createNewMessageBuilderV2[*BeginTxnMessageHeader, *BeginTxnMessageBody]()
 	NewCommitTxnMessageBuilderV2        = createNewMessageBuilderV2[*CommitTxnMessageHeader, *CommitTxnMessageBody]()
 	NewRollbackTxnMessageBuilderV2      = createNewMessageBuilderV2[*RollbackTxnMessageHeader, *RollbackTxnMessageBody]()
+	NewSchemaChangeMessageBuilderV2     = createNewMessageBuilderV2[*SchemaChangeMessageHeader, *SchemaChangeMessageBody]()
 	newTxnMessageBuilderV2              = createNewMessageBuilderV2[*TxnMessageHeader, *TxnMessageBody]()
 )
 

pkg/streaming/util/message/message_type.go

@@ -25,6 +25,7 @@ const (
 	MessageTypeCommitTxn        MessageType = MessageType(messagespb.MessageType_CommitTxn)
 	MessageTypeRollbackTxn      MessageType = MessageType(messagespb.MessageType_RollbackTxn)
 	MessageTypeImport           MessageType = MessageType(messagespb.MessageType_Import)
+	MessageTypeSchemaChange     MessageType = MessageType(messagespb.MessageType_SchemaChange)
 )
 
 var messageTypeName = map[MessageType]string{
@@ -44,6 +45,7 @@ var messageTypeName = map[MessageType]string{
 	MessageTypeCommitTxn:        "COMMIT_TXN",
 	MessageTypeRollbackTxn:      "ROLLBACK_TXN",
 	MessageTypeImport:           "IMPORT",
+	MessageTypeSchemaChange:     "SCHEMA_CHANGE",
 }
 
 // String implements fmt.Stringer interface.

pkg/streaming/util/message/specialized_message.go

@@ -29,6 +29,7 @@ type (
 	RollbackTxnMessageHeader      = messagespb.RollbackTxnMessageHeader
 	TxnMessageHeader              = messagespb.TxnMessageHeader
 	ImportMessageHeader           = messagespb.ImportMessageHeader
+	SchemaChangeMessageHeader     = messagespb.SchemaChangeMessageHeader
 )
 
 type (
@@ -39,6 +40,7 @@ type (
 	CommitTxnMessageBody     = messagespb.CommitTxnMessageBody
 	RollbackTxnMessageBody   = messagespb.RollbackTxnMessageBody
 	TxnMessageBody           = messagespb.TxnMessageBody
+	SchemaChangeMessageBody  = messagespb.SchemaChangeMessageBody
 )
 
 type (
@@ -62,6 +64,7 @@ var messageTypeMap = map[reflect.Type]MessageType{
 	reflect.TypeOf(&RollbackTxnMessageHeader{}):      MessageTypeRollbackTxn,
 	reflect.TypeOf(&TxnMessageHeader{}):              MessageTypeTxn,
 	reflect.TypeOf(&ImportMessageHeader{}):           MessageTypeImport,
+	reflect.TypeOf(&SchemaChangeMessageHeader{}):     MessageTypeSchemaChange,
 }
 
 // A system preserved message, should not allowed to provide outside of the streaming system.
@@ -93,6 +96,7 @@ type (
 	MutableBeginTxnMessageV2         = specializedMutableMessage[*BeginTxnMessageHeader, *BeginTxnMessageBody]
 	MutableCommitTxnMessageV2        = specializedMutableMessage[*CommitTxnMessageHeader, *CommitTxnMessageBody]
 	MutableRollbackTxnMessageV2      = specializedMutableMessage[*RollbackTxnMessageHeader, *RollbackTxnMessageBody]
+	MutableSchemaChangeMessageV2     = specializedMutableMessage[*SchemaChangeMessageHeader, *SchemaChangeMessageBody]
 
 	ImmutableTimeTickMessageV1         = specializedImmutableMessage[*TimeTickMessageHeader, *msgpb.TimeTickMsg]
 	ImmutableInsertMessageV1           = specializedImmutableMessage[*InsertMessageHeader, *msgpb.InsertRequest]
@@ -108,6 +112,7 @@ type (
 	ImmutableBeginTxnMessageV2         = specializedImmutableMessage[*BeginTxnMessageHeader, *BeginTxnMessageBody]
 	ImmutableCommitTxnMessageV2        = specializedImmutableMessage[*CommitTxnMessageHeader, *CommitTxnMessageBody]
 	ImmutableRollbackTxnMessageV2      = specializedImmutableMessage[*RollbackTxnMessageHeader, *RollbackTxnMessageBody]
+	ImmutableSchemaChangeMessageV2     = specializedImmutableMessage[*SchemaChangeMessageHeader, *SchemaChangeMessageBody]
 )
 
 // List all as functions for specialized messages.
@@ -141,6 +146,7 @@ var (
 	AsImmutableBeginTxnMessageV2         = asSpecializedImmutableMessage[*BeginTxnMessageHeader, *BeginTxnMessageBody]
 	AsImmutableCommitTxnMessageV2        = asSpecializedImmutableMessage[*CommitTxnMessageHeader, *CommitTxnMessageBody]
 	AsImmutableRollbackTxnMessageV2      = asSpecializedImmutableMessage[*RollbackTxnMessageHeader, *RollbackTxnMessageBody]
+	AsImmutableCollectionSchemaChangeV2  = asSpecializedImmutableMessage[*SchemaChangeMessageHeader, *SchemaChangeMessageBody]
 	AsImmutableTxnMessage                = func(msg ImmutableMessage) ImmutableTxnMessage {
 		underlying, ok := msg.(*immutableTxnMessageImpl)
 		if !ok {