yiheng opened a new pull request #276: [LIVY-723] Server Registration URL: https://github.com/apache/incubator-livy/pull/276 ## What changes were proposed in this pull request? In this patch, we check in a ClusterManager class to handle the node join/leave cluster events based on Zookeeper. Users can add listeners to monitor node join/leave. ## How was this patch tested? Add new unit tests and manual tests. Please review https://livy.incubator.apache.org/community/ before opening a pull request.
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