TisonKun commented on issue #1276: ZOOKEEPER-3497:Change the constructor of MBeanRegistry to private URL: https://github.com/apache/zookeeper/pull/1276#issuecomment-595004371 > > we can remove the setter and change the static instance field to final. > > Agree with removing the setter > > * `private static MBeanRegistry instance = new MBeanRegistry();` is already enough for thread-safe and simply? `volatile` or `final` is no need? `volatile` in no need. `final` can help the Java compiler & JVM for optimization. Thus generally we mark final field as final.
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