Make the `UnsubDmChannel` rpc unsuccessful when the releaseCollectionTask fails (#21469)

Signed-off-by: SimFG <bang.fu@zilliz.com>

internal/querynode/impl.go

@@ -433,19 +433,19 @@ func (node *QueryNode) UnsubDmChannel(ctx context.Context, req *querypb.UnsubDmC
 	}
 	log.Info("unsubDmChannel(ReleaseCollection) enqueue done", zap.Int64("collectionID", req.GetCollectionID()))
 
-	func() {
 	err = dct.WaitToFinish()
 	if err != nil {
 		log.Warn("failed to do subscribe channel task successfully", zap.Error(err))
-			return
+		return &commonpb.Status{
+			ErrorCode: commonpb.ErrorCode_UnexpectedError,
+			Reason:    err.Error(),
+		}, nil
 	}
-		log.Info("unsubDmChannel(ReleaseCollection) WaitToFinish done", zap.Int64("collectionID", req.GetCollectionID()))
-	}()
 
-	status := &commonpb.Status{
+	log.Info("unsubDmChannel(ReleaseCollection) WaitToFinish done", zap.Int64("collectionID", req.GetCollectionID()))
+	return &commonpb.Status{
 		ErrorCode: commonpb.ErrorCode_Success,
-	}
-	return status, nil
+	}, nil
 }
 
 // LoadSegments load historical data into query node, historical data can be vector data or index

internal/querynode/impl_test.go

@@ -212,6 +212,54 @@ func TestImpl_UnsubDmChannel(t *testing.T) {
 	node, err := genSimpleQueryNode(ctx)
 	assert.NoError(t, err)
 
+	t.Run("normal run", func(t *testing.T) {
+		schema := genTestCollectionSchema()
+		req := &queryPb.WatchDmChannelsRequest{
+			Base: &commonpb.MsgBase{
+				MsgType:  commonpb.MsgType_WatchDmChannels,
+				MsgID:    rand.Int63(),
+				TargetID: node.session.ServerID,
+			},
+			NodeID:       0,
+			CollectionID: defaultCollectionID,
+			PartitionIDs: []UniqueID{defaultPartitionID},
+			Schema:       schema,
+			Infos: []*datapb.VchannelInfo{
+				{
+					CollectionID: 1000,
+					ChannelName:  "1000-dmc0",
+				},
+			},
+		}
+
+		status, err := node.WatchDmChannels(ctx, req)
+		assert.NoError(t, err)
+		assert.Equal(t, commonpb.ErrorCode_Success, status.ErrorCode)
+
+		{
+			req := &queryPb.UnsubDmChannelRequest{
+				Base: &commonpb.MsgBase{
+					MsgType:  commonpb.MsgType_UnsubDmChannel,
+					MsgID:    rand.Int63(),
+					TargetID: node.session.ServerID,
+				},
+				NodeID:       0,
+				CollectionID: defaultCollectionID,
+				ChannelName:  "1000-dmc0",
+			}
+			originMetaReplica := node.metaReplica
+			node.metaReplica = newMockReplicaInterface()
+			status, err := node.UnsubDmChannel(ctx, req)
+			assert.NoError(t, err)
+			assert.Equal(t, commonpb.ErrorCode_UnexpectedError, status.ErrorCode)
+
+			node.metaReplica = originMetaReplica
+			status, err = node.UnsubDmChannel(ctx, req)
+			assert.NoError(t, err)
+			assert.Equal(t, commonpb.ErrorCode_Success, status.ErrorCode)
+		}
+	})
+
 	t.Run("target not match", func(t *testing.T) {
 		req := &queryPb.UnsubDmChannelRequest{
 			Base: &commonpb.MsgBase{