The Apache BookKeeper subproject of ZooKeeper is made up of a distributed logging service called BookKeeper and a distributed publish/subscribe system built on top of BookKeeper called Hedwig.
Learn more about BookKeeper on the BookKeeper Wiki.
Learn more about Hedwig on the Hedwig Wiki.
Apache ZooKeeper is an open source volunteer project under the Apache Software Foundation. It is a subproject of Hadoop. We encourage you to learn about the project and contribute your expertise. Here are some starter links:
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