Merge pull request redis#936 from go-redis/fix/retry-cluster-pipeline…

…-read-cmds

Retry cluster pipeline read commands

cluster.go

@@ -1314,14 +1314,15 @@ func (c *ClusterClient) pipelineProcessCmds(
 	}
 
 	err = cn.WithReader(c.opt.ReadTimeout, func(rd *proto.Reader) error {
-		return c.pipelineReadCmds(rd, cmds, failedCmds)
+		return c.pipelineReadCmds(node, rd, cmds, failedCmds)
 	})
 	return err
 }
 
 func (c *ClusterClient) pipelineReadCmds(
-	rd *proto.Reader, cmds []Cmder, failedCmds *cmdsMap,
+	node *clusterNode, rd *proto.Reader, cmds []Cmder, failedCmds *cmdsMap,
 ) error {
+	var firstErr error
 	for _, cmd := range cmds {
 		err := cmd.readReply(rd)
 		if err == nil {
@@ -1336,9 +1337,14 @@ func (c *ClusterClient) pipelineReadCmds(
 			continue
 		}
 
-		return err
+		failedCmds.mu.Lock()
+		failedCmds.m[node] = append(failedCmds.m[node], cmd)
+		failedCmds.mu.Unlock()
+		if firstErr == nil {
+			firstErr = err
+		}
 	}
-	return nil
+	return firstErr
 }
 
 func (c *ClusterClient) checkMovedErr(