enhance: Append create partition msg to wal (#35398)

issue: https://github.com/milvus-io/milvus/issues/33285

---------

Signed-off-by: bigsheeper <yihao.dai@zilliz.com>

internal/distributed/streaming/streaming.go

@@ -10,10 +10,6 @@ import (
 
 var singleton WALAccesser = nil
 
-func SetWAL(w WALAccesser) {
-	singleton = w
-}
-
 // Init initializes the wal accesser with the given etcd client.
 // should be called before any other operations.
 func Init() {
@@ -23,9 +19,7 @@ func Init() {
 
 // Release releases the resources of the wal accesser.
 func Release() {
-	if w, ok := singleton.(*walAccesserImpl); ok && w != nil {
-		w.Close()
-	}
+	singleton.Close()
 }
 
 // WAL is the entrance to interact with the milvus write ahead log.
@@ -67,4 +61,7 @@ type WALAccesser interface {
 
 	// Read returns a scanner for reading records from the wal.
 	Read(ctx context.Context, opts ReadOption) Scanner
+
+	// Close closes the wal accesser
+	Close()
 }

internal/distributed/streaming/test_streaming.go

@@ -0,0 +1,24 @@
+// 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.
+
+//go:build test
+
+package streaming
+
+// SetWALForTest initializes the singleton of wal for test.
+func SetWALForTest(w WALAccesser) {
+	singleton = w
+}

internal/mocks/distributed/mock_streaming/mock_WALAccesser.go

@@ -81,6 +81,38 @@ func (_c *MockWALAccesser_Append_Call) RunAndReturn(run func(context.Context, ..
 	return _c
 }
 
+// Close provides a mock function with given fields:
+func (_m *MockWALAccesser) Close() {
+	_m.Called()
+}
+
+// MockWALAccesser_Close_Call is a *mock.Call that shadows Run/Return methods with type explicit version for method 'Close'
+type MockWALAccesser_Close_Call struct {
+	*mock.Call
+}
+
+// Close is a helper method to define mock.On call
+func (_e *MockWALAccesser_Expecter) Close() *MockWALAccesser_Close_Call {
+	return &MockWALAccesser_Close_Call{Call: _e.mock.On("Close")}
+}
+
+func (_c *MockWALAccesser_Close_Call) Run(run func()) *MockWALAccesser_Close_Call {
+	_c.Call.Run(func(args mock.Arguments) {
+		run()
+	})
+	return _c
+}
+
+func (_c *MockWALAccesser_Close_Call) Return() *MockWALAccesser_Close_Call {
+	_c.Call.Return()
+	return _c
+}
+
+func (_c *MockWALAccesser_Close_Call) RunAndReturn(run func()) *MockWALAccesser_Close_Call {
+	_c.Call.Return(run)
+	return _c
+}
+
 // Read provides a mock function with given fields: ctx, opts
 func (_m *MockWALAccesser) Read(ctx context.Context, opts streaming.ReadOption) streaming.Scanner {
 	ret := _m.Called(ctx, opts)

internal/rootcoord/create_partition_task.go

@@ -26,6 +26,7 @@ import (
 	"github.com/milvus-io/milvus-proto/go-api/v2/milvuspb"
 	"github.com/milvus-io/milvus/internal/metastore/model"
 	pb "github.com/milvus-io/milvus/internal/proto/etcdpb"
+	"github.com/milvus-io/milvus/internal/util/streamingutil"
 	"github.com/milvus-io/milvus/pkg/log"
 )
 
@@ -96,6 +97,14 @@ func (t *createPartitionTask) Execute(ctx context.Context) error {
 		ts:           t.GetTs(),
 	})
 
+	if streamingutil.IsStreamingServiceEnabled() {
+		undoTask.AddStep(&broadcastCreatePartitionMsgStep{
+			baseStep:  baseStep{core: t.core},
+			vchannels: t.collMeta.VirtualChannelNames,
+			partition: partition,
+		}, &nullStep{})
+	}
+
 	undoTask.AddStep(&nullStep{}, &releasePartitionsStep{
 		baseStep:     baseStep{core: t.core},
 		collectionID: t.collMeta.CollectionID,

internal/rootcoord/garbage_collector_test.go

@@ -548,7 +548,7 @@ func TestGcPartitionData(t *testing.T) {
 
 	wal := mock_streaming.NewMockWALAccesser(t)
 	wal.EXPECT().Append(mock.Anything, mock.Anything, mock.Anything).Return(streaming.AppendResponses{})
-	streaming.SetWAL(wal)
+	streaming.SetWALForTest(wal)
 
 	tsoAllocator := mocktso.NewAllocator(t)
 	tsoAllocator.EXPECT().GenerateTSO(mock.Anything).Return(1000, nil)

internal/rootcoord/step.go

@@ -21,10 +21,15 @@ import (
 	"fmt"
 	"time"
 
+	"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/internal/distributed/streaming"
 	"github.com/milvus-io/milvus/internal/metastore/model"
 	pb "github.com/milvus-io/milvus/internal/proto/etcdpb"
 	"github.com/milvus-io/milvus/internal/util/proxyutil"
+	"github.com/milvus-io/milvus/pkg/streaming/util/message"
+	"github.com/milvus-io/milvus/pkg/util/commonpbutil"
 )
 
 type stepPriority int
@@ -374,6 +379,49 @@ func (s *addPartitionMetaStep) Desc() string {
 	return fmt.Sprintf("add partition to meta table, collection: %d, partition: %d", s.partition.CollectionID, s.partition.PartitionID)
 }
 
+type broadcastCreatePartitionMsgStep struct {
+	baseStep
+	vchannels []string
+	partition *model.Partition
+}
+
+func (s *broadcastCreatePartitionMsgStep) Execute(ctx context.Context) ([]nestedStep, error) {
+	req := &msgpb.CreatePartitionRequest{
+		Base: commonpbutil.NewMsgBase(
+			commonpbutil.WithMsgType(commonpb.MsgType_CreatePartition),
+			commonpbutil.WithTimeStamp(0), // ts is given by streamingnode.
+		),
+		PartitionName: s.partition.PartitionName,
+		CollectionID:  s.partition.CollectionID,
+		PartitionID:   s.partition.PartitionID,
+	}
+
+	msgs := make([]message.MutableMessage, 0, len(s.vchannels))
+	for _, vchannel := range s.vchannels {
+		msg, err := message.NewCreatePartitionMessageBuilderV1().
+			WithVChannel(vchannel).
+			WithHeader(&message.CreatePartitionMessageHeader{
+				CollectionId: s.partition.CollectionID,
+				PartitionId:  s.partition.PartitionID,
+			}).
+			WithBody(req).
+			BuildMutable()
+		if err != nil {
+			return nil, err
+		}
+		msgs = append(msgs, msg)
+	}
+	resp := streaming.WAL().Append(ctx, msgs...)
+	if err := resp.IsAnyError(); err != nil {
+		return nil, err
+	}
+	return nil, nil
+}
+
+func (s *broadcastCreatePartitionMsgStep) Desc() string {
+	return fmt.Sprintf("broadcast create partition message to mq, collection: %d, partition: %d", s.partition.CollectionID, s.partition.PartitionID)
+}
+
 type changePartitionStateStep struct {
 	baseStep
 	collectionID UniqueID

internal/rootcoord/step_test.go

@@ -22,6 +22,11 @@ import (
 	"time"
 
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/mock"
+
+	"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"
 )
 
 func Test_waitForTsSyncedStep_Execute(t *testing.T) {
@@ -115,3 +120,21 @@ func TestSkip(t *testing.T) {
 		assert.NoError(t, err)
 	}
 }
+
+func TestBroadcastCreatePartitionMsgStep(t *testing.T) {
+	wal := mock_streaming.NewMockWALAccesser(t)
+	wal.EXPECT().Append(mock.Anything, mock.Anything, mock.Anything).Return(streaming.AppendResponses{})
+	streaming.SetWALForTest(wal)
+
+	step := &broadcastCreatePartitionMsgStep{
+		baseStep:  baseStep{core: nil},
+		vchannels: []string{"ch-0", "ch-1"},
+		partition: &model.Partition{
+			CollectionID: 1,
+			PartitionID:  2,
+		},
+	}
+	t.Logf("%v\n", step.Desc())
+	_, err := step.Execute(context.Background())
+	assert.NoError(t, err)
+}