CCD-410 Question #25: Real Exam Question with Answer & Explanation

The correct answer is A. Sequences of MapReduce and Pig.. 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

Question

Workflows expressed in Oozie can contain:

Options

ASequences of MapReduce and Pig.
BSequences of MapReduce job only; on Pig on Hive tasks or jobs.
CSequences of MapReduce and Pig jobs. These are limited to linear sequences of actions with exception
DIterntive repetition of MapReduce jobs until a desired answer or state is reached.

Explanation

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

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