Hortonworks Exam HDPCD Topic 2 Question 24 Discussion

Actual exam question for Hortonworks's HDPCD exam

Question #: 24
Topic #: 2

Workflows expressed in Oozie can contain:

ASequences of MapReduce and Pig. These sequences can be combined with other actions including forks, decision points, and path joins.

BSequences of MapReduce job only; on Pig on Hive tasks or jobs. These MapReduce sequences can be combined with forks and path joins.

CSequences of MapReduce and Pig jobs. These are limited to linear sequences of actions with exception handlers but no forks.

DIterntive repetition of MapReduce jobs until a desired answer or state is reached.

Show Suggested Answer

Suggested Answer: A

Oozie workflow is a collection of actions (i.e. Hadoop Map/Reduce jobs, Pig jobs) arranged in a control dependency DAG (Direct Acyclic Graph), specifying a sequence of actions execution. This graph is specified in hPDL (a XML Process Definition Language).

hPDL is a fairly compact language, using a limited amount of flow control and action nodes. Control nodes define the flow of execution and include beginning and end of a workflow (start, end and fail nodes) and mechanisms to control the workflow execution path ( decision, fork and join nodes).

Workflow definitions

Currently running workflow instances, including instance states and variables

Note: Oozie is a Java Web-Application that runs in a Java servlet-container - Tomcat and uses a database to store:

by Loren at Jul 27, 2022, 09:34 PM

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