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What is Oozie?
- Oozie is workflow scheduler system to manage apache hadoop jobs
- Oozie is integrated with the rest of the Haddop stack supporting serveral types of Hadoop jobs out of the box as well as system specific jobs
- Oozie is a scalable, reliable and extensible system
- Oozie is a workflow/cordination service to manage data processing jobs for Hadoop.
- Oozie is a Java Web Application that runs in a Java servlet container.
- For the purpose of Oozie, a workflow is a collection of actions arranged in a control dependency DAG. "Control dependency" from one action to another means that the second action can not run until the first action has completed.
Oozie -why use it ?
- It is designed for hadoop
- It is open source
- It is designed for big data
- It allow you to design task work flow
- It allows you to interact with jobs
- Stop, start, suspend, resume, rerun
- Highly scalable
- High availability
- Hue Integration
Many Problem using Oozie i.e:
1) Doing something on the grid often required multiple steps
- Mapreduce job
- Pig job
- Streaming job
- HDFS operation
2) Multiple ad-hoc solutions existed
- Custom job control
- Shell scripts
3) Cost of building and running apps were high
- Development and applications engineering
- Support, operations and hardware
Oozie Workflow Example:
<start to ='wordcount'/>
<ok to ='end'/>
<error to ='kill'/>
<end name ='end'/>