Fix race condition when creating the cluster node

cluster.go

@@ -17,7 +17,6 @@ import (
 	"github.com/go-redis/redis/internal/hashtag"
 	"github.com/go-redis/redis/internal/pool"
 	"github.com/go-redis/redis/internal/proto"
-	"github.com/go-redis/redis/internal/singleflight"
 )
 
 var errClusterNoNodes = fmt.Errorf("redis: cluster has no nodes")
@@ -243,8 +242,6 @@ type clusterNodes struct {
 	clusterAddrs []string
 	closed       bool
 
-	nodeCreateGroup singleflight.Group
-
 	_generation uint32 // atomic
 }
 
@@ -347,11 +344,6 @@ func (c *clusterNodes) GetOrCreate(addr string) (*clusterNode, error) {
 		return node, nil
 	}
 
-	v, err := c.nodeCreateGroup.Do(addr, func() (interface{}, error) {
-		node := newClusterNode(c.opt, addr)
-		return node, nil
-	})
-
 	c.mu.Lock()
 	defer c.mu.Unlock()
 
@@ -361,10 +353,10 @@ func (c *clusterNodes) GetOrCreate(addr string) (*clusterNode, error) {
 
 	node, ok := c.allNodes[addr]
 	if ok {
-		_ = v.(*clusterNode).Close()
 		return node, err
 	}
-	node = v.(*clusterNode)
+
+	node = newClusterNode(c.opt, addr)
 
 	c.allAddrs = appendIfNotExists(c.allAddrs, addr)
 	if err == nil {