fix: restore shard cluster failed if the origin cluster's shards less than cluster's shards (#10021)

Author: wangyelei

controllers/apps/cluster/transformer_cluster_restore.go

@@ -20,7 +20,9 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 package cluster
 
 import (
+	"fmt"
 	"sort"
+	"time"
 
 	"k8s.io/apimachinery/pkg/util/json"
 	"sigs.k8s.io/controller-runtime/pkg/client"
@@ -74,7 +76,10 @@ func (c *clusterRestoreTransformer) Transform(ctx graph.TransformContext, dag *g
 		if err != nil {
 			return err
 		}
-
+		if int(spec.Shards) > len(backup.Status.Targets) && len(shardComponents) < int(spec.Shards) {
+			return intctrlutil.NewRequeueError(time.Second,
+				fmt.Sprintf(`the shard components of sharding "%s" are not ready, wait for next loop to allocate source targets`, spec.Name))
+		}
 		targets := backup.Status.Targets
 		// obtain components that have already been assigned targets.
 		allocateTargetMap := map[string]string{}