i3wangyi opened a new issue #661: Remove all listeners when leader controller transits to standby URL: https://github.com/apache/helix/issues/661 The experiment shows when a leader controller transits to standby mode, the majority performance bottleneck (90%+) spent on removing the existing listeners. Further analysis shows the listeners' removal step spent most of the time on `getChildren()` request for some paths (CURRENTSTATES, e.g). However, the GET request is unnecessary in this use case. When the controller is the leader of a cluster, all the listeners persisted in memory have persisted the up-to-date information of all the zookeeper paths. Thus, the issue tracks the progress of making use of existing "unsubscribeAll" method in zkClient ot gain the performance improvement
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