Hadoop Oozie Questions and Answers

This set of Hadoop Multiple Choice Questions & Answers (MCQs) focuses on “Oozie with Hadoop – 1”.

1. __________ is a server based Bundle Engine that provides a higher-level oozie abstraction that will batch a set of coordinator applications.
a) Oozie v2
b) Oozie v3
c) Oozie v4
d) Oozie v5
View Answer

Answer: c
Explanation: Oozie combines multiple jobs sequentially into one logical unit of work.

2. Point out the correct statement.
a) Oozie is a scalable, reliable and extensible system
b) Oozie is a server-based Workflow Engine specialized in running workflow jobs
c) Oozie Coordinator jobs are recurrent Oozie Workflow jobs triggered by time (frequency) and data availability
d) All of the mentioned
View Answer

Answer: d
Explanation: Jobs include streaming as well as system specific jobs.

3. ___________ is a Java Web application used to schedule Apache Hadoop jobs.
a) Impala
b) Oozie
c) Mahout
d) All of the mentioned
View Answer

Answer: b
Explanation: Oozie is a workflow scheduler system to manage Hadoop jobs.

4. Oozie Workflow jobs are Directed ________ graphs of actions.
a) Acyclical
b) Cyclical
c) Elliptical
d) All of the mentioned
View Answer

Answer: a
Explanation: Oozie is a framework allowing to combine multiple Map/Reduce jobs into a logical unit of work.

5. Point out the wrong statement.
a) Oozie v2 is a server based Coordinator Engine specialized in running workflows based on time and data triggers
b) Oozie v1 is a server based Workflow Engine specialized in running workflow jobs with actions that execute Hadoop Map/Reduce and Pig jobs
c) A Workflow application is DAG that coordinates the following types of actions
d) None of the mentioned
View Answer

Answer: d
Explanation: Cycle in workflows are not supported.

6. Oozie v2 is a server based ___________ Engine specialized in running workflows based on time and data triggers.
a) Compactor
b) Collector
c) Coordinator
d) All of the mentioned
View Answer

Answer: c
Explanation: Oozie v2 can continuously run workflows based on time and data.

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7. Which of the following is one of the possible state for a workflow jobs?
a) PREP
b) START
c) RESUME
d) END
View Answer

Answer: a
Explanation: Possible states for a workflow jobs are: PREP, RUNNING, SUSPENDED, SUCCEEDED, KILLED and FAILED.

8. Oozie can make _________ callback notifications on action start events and workflow end events.
a) TCP
b) HTTP
c) IP
d) All of the mentioned
View Answer

Answer: b
Explanation: In the case of an action start failure in a workflow job, depending on the type of failure, Oozie will attempt automatic retries, it will request a manual retry or it will fail the workflow job.

9. A workflow definition is a ______ with control flow nodes or action nodes.
a) CAG
b) DAG
c) BAG
d) None of the mentioned
View Answer

Answer: b
Explanation: Oozie does not support cycles in workflow definitions, workflow definitions must be a strict DAG.

10. Which of the following workflow definition language is XML based?
a) hpDL
b) hDL
c) hiDL
d) none of the mentioned
View Answer

Answer: a
Explanation: hpDL stands for Hadoop Process Definition Language.

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