Each action represents a Hadoop job, Pig, Hive, Sqoop, or Hadoop DistCp job in a directed acyclic graph (DAG) that captures control dependency. It is a DAG that has a collection of action and control nodes. What is Apache Oozie Workflow, and How Does it Work?Ī Hadoop Job is an Apache Oozie workflow. Oozie provides the ability to send email reminders when jobs are completed.Oozie offers the ability to run jobs that are scheduled to run on a regular basis.Its Web Service APIs allow users to manage tasks from anywhere.Oozie includes a client API and a command-line interface that may be used to start, control, and monitor jobs from a Java programme.Oozie has multiple features, the main features of Oozie are as follows: Oozie can poll the job for completion if it fails to activate the callback URL. When Oozie begins a job, it assigns it a unique callback HTTP URL and notifies that URL when the work is finished. Callback and polling are used by Apache Oozie to detect task completion.It’s even possible to bypass a failed node entirely. It’s easy to see how tough it might be to make up for jobs that were missed or failed due to delay or failure. Rerunning failed processes is a breeze with Oozie. Jobs can be simply started, stopped, suspended, and restarted. Oozie is scalable and can run thousands of workflows (each containing dozens of tasks) on a Hadoop cluster in real-time.In addition, Oozie allows you to choose the frequency with which a job is executed. As a result, the user’s time to handle the entire workflow is saved. Oozie reads this data and ensures that tasks are completed in the right sequence as stated in a process. A user specifies work dependencies using Directed Acyclic Graphs. The primary goal of Oozie is to handle various types of tasks that are processed in the Hadoop environment.Let us see some of the best reasons to use Oozie: It has many features and is easy to implement. Oozie Bundles are a collection of many coordinators and workflow jobs in one bundle. Workflow jobs triggered by time and data availability are called Oozie Coordinator Jobs. Oozie Workflow jobs are Directed Acyclic Graphs (DAGs) that define a set of activities to be performed. In Apache Oozie, there are Three Sorts of Jobs:
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