Relax the cluster version check when updating the cluster

Before this PR, we require the cluster shouldn't be modified when
updating, but users might modify the cluster information via the redis
client during this period. To allow this, we only check if the current
version is newer than the store.

scripts/run-test.sh

@@ -18,4 +18,4 @@
 
 set -e -x
 
-go test -v ./... -covermode=atomic -coverprofile=coverage.out -race -p 1
+CGO_ENABLED=0 go test -v ./... -covermode=atomic -coverprofile=coverage.out -race -p 1

store/store.go

@@ -180,7 +180,7 @@ func (s *ClusterStore) UpdateCluster(ctx context.Context, ns string, clusterInfo
 	if err != nil {
 		return err
 	}
-	if oldCluster.Version.Load() != clusterInfo.Version.Load() {
+	if oldCluster.Version.Load() > clusterInfo.Version.Load() {
 		return fmt.Errorf("the cluster has been updated by others")
 	}
 
@@ -212,7 +212,7 @@ func (s *ClusterStore) SetCluster(ctx context.Context, ns string, clusterInfo *C
 	if err != nil {
 		return err
 	}
-	if oldCluster.Version.Load() != clusterInfo.Version.Load() {
+	if oldCluster.Version.Load() > clusterInfo.Version.Load() {
 		return fmt.Errorf("the cluster has been updated by others")
 	}