节点启停会造成 zk-client对 zk进行重连，如果在重连过程中对节点进行 getChildren操作，就有可能造成 connection loss. 此时节点的watcher就会设置不上，后续节点的children变更就拿不到了.
[ Full content available at: https://github.com/apache/dubbo-js/issues/80 ] This message was relayed via gitbox.apache.org for [email protected]
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