Apache ZooKeeper has become a de facto standard for distributed coordination. _Its design has proven to be flexible enough that it can be applied to a variety of needs of distributed applications. It has been used for leader election, service discovery, status monitoring, dynamic configuration etc. Recently new use cases have come up where ZooKeeper is being used as a discovery service with thousands of clients. Couple of examples include Hadoop Namenode HA and Yarn HA. This has led to a new set of requirements that need to be addressed. There is a need for session-less read-only client creation to address startup latency issues of thousands of clients . Also, such scale creates a need for reducing memory footprint of watch management in ZooKeeper. In this talk we will discuss the various new use cases that are coming up in Apache ZooKeeper and the work that is being done in the community to address these issues. We will also discuss the future roadmap for ZooKeeper.
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