ZooKeeper started as an internal Yahoo project. After being released as free software to the Apache foundation it became a critical building block of well known systems like HBase, Cassandra, Neo4j and SOLR and many more lesser known but critical systems at linkedin, yahoo, facebook and rackspace. Despite being so useful and important, most people are not aware of the hard working ZooKeeper.
ZooKeeper helps you to supervise the availability of processes (heartbeat), to implement distributed locking, leader election, central configuration and reliable messaging.
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