refine err msg about no available node in replica (#24256)

Signed-off-by: Wei Liu <wei.liu@zilliz.com>

internal/querycoordv2/services.go

@@ -809,13 +809,23 @@ func (s *Server) GetReplicas(ctx context.Context, req *milvuspb.GetReplicasReque
 	}
 
 	for _, replica := range replicas {
-		info, err := s.fillReplicaInfo(replica, req.GetWithShardNodes())
-		if err != nil {
-			msg := "failed to get replica info"
+		msg := "failed to get replica info"
+		if len(replica.GetNodes()) == 0 {
+			err := merr.WrapErrNoAvailableNodeInReplica(replica.ID)
 			log.Warn(msg,
 				zap.Int64("replica", replica.GetID()),
 				zap.Error(err))
 			resp.Status = utils.WrapStatus(commonpb.ErrorCode_MetaFailed, msg, err)
+			break
+		}
+
+		info, err := s.fillReplicaInfo(replica, req.GetWithShardNodes())
+		if err != nil {
+			log.Warn(msg,
+				zap.Int64("replica", replica.GetID()),
+				zap.Error(err))
+			resp.Status = utils.WrapStatus(commonpb.ErrorCode_MetaFailed, msg, err)
+			break
 		}
 		resp.Replicas = append(resp.Replicas, info)
 	}

internal/querycoordv2/services_test.go

@@ -1404,6 +1404,24 @@ func (suite *ServiceSuite) TestGetReplicas() {
 	suite.Equal(resp.GetStatus().GetCode(), merr.Code(merr.ErrServiceNotReady))
 }
 
+func (suite *ServiceSuite) TestGetReplicasFailed() {
+	suite.loadAll()
+	ctx := context.Background()
+	server := suite.server
+
+	suite.meta.ReplicaManager.Put(utils.CreateTestReplica(100001, 100000, []int64{}))
+	suite.meta.ReplicaManager.Put(utils.CreateTestReplica(100002, 100000, []int64{1}))
+
+	req := &milvuspb.GetReplicasRequest{
+		CollectionID:   100000,
+		WithShardNodes: true,
+	}
+	resp, err := server.GetReplicas(ctx, req)
+	suite.NoError(err)
+	suite.Equal(commonpb.ErrorCode_MetaFailed, resp.GetStatus().GetErrorCode())
+	suite.EqualValues(resp.GetStatus().GetReason(), "failed to get replica info, err=replica=100001: no available node in replica")
+}
+
 func (suite *ServiceSuite) TestCheckHealth() {
 	ctx := context.Background()
 	server := suite.server

pkg/util/merr/errors.go

@@ -67,7 +67,8 @@ var (
 	ErrResourceGroupNotFound = newMilvusError("resource group not found", 300, false)
 
 	// Replica related
-	ErrReplicaNotFound = newMilvusError("replica not found", 400, false)
+	ErrReplicaNotFound          = newMilvusError("replica not found", 400, false)
+	ErrNoAvailableNodeInReplica = newMilvusError("no available node in replica", 401, false)
 
 	// Channel related
 	ErrChannelNotFound    = newMilvusError("channel not found", 500, false)

pkg/util/merr/utils.go

@@ -220,6 +220,14 @@ func WrapErrReplicaNotFound(id int64, msg ...string) error {
 	return err
 }
 
+func WrapErrNoAvailableNodeInReplica(id int64, msg ...string) error {
+	err := wrapWithField(ErrNoAvailableNodeInReplica, "replica", id)
+	if len(msg) > 0 {
+		err = errors.Wrap(err, strings.Join(msg, "; "))
+	}
+	return err
+}
+
 // Channel related
 func WrapErrChannelNotFound(name string, msg ...string) error {
 	err := wrapWithField(ErrChannelNotFound, "channel", name)