这里REGISTRIES在使用的时候都会先加锁，不存在多线程安全的问题，所以建议把ConcurrentHashMap改成HashMap，提高运行效率。
issue ：#2685 [ Full content available at: https://github.com/apache/incubator-dubbo/pull/2703 ] This message was relayed via gitbox.apache.org for [email protected]
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