zonghaishang opened a new issue #1517: Zookeeper query map too many times URL: https://github.com/apache/incubator-dubbo/issues/1517 see com.alibaba.dubbo.registry.zookeeperZookeeperRegistry#doSubscribe ``` java ConcurrentMap<NotifyListener, ChildListener> listeners = zkListeners.get(url); if (listeners == null) { zkListeners.putIfAbsent(url, new ConcurrentHashMap<NotifyListener, ChildListener>()); listeners = zkListeners.get(url); } ``` "zkListeners.get(url)" query map too many times, it can be done only once. We can use java.util.concurrent.ConcurrentMap#putIfAbsent method.
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