还有种情况会导致拿不到服务列表,情况是provider没有注册到zk上,但与本issue无关。
https://github.com/apache/zookeeper/pull/304
出现场景是 zk服务器故障,provider重连zk创建节点, 却由于之前的临时节点未删除返回NodeExists异常,provider误以为服务注册成功。 
后续故障服务器恢复删除了临时节点,导致实际上服务注册列表为空。

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