Oozie, an open source project, is implemented as a Java web application that runs in a Java servlet container and is distributed under the Apache License 2.0. It is a workflow scheduling system to manage Hadoop jobs. Oozie combines multiple jobs sequentially into one logical unit of work. It is integrated with the Hadoop stack, with YARN as its architectural center, and supports Hadoop jobs for Apache MapReduce, Apache Pig, Apache Hive, and Apache Sqoop. Oozie can also schedule jobs specific to a system, like Java programs or shell scripts. Oozie is similar to what a cron is in Unix, but with a wider range of possibilities.

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