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151.	Point out the wrong statement.(a) Oozie provides a unique callback URL to the task, the task should invoke the given URL to notify its completion(b) All computation/processing tasks triggered by an mechanism node are remote to Oozie(c) Oozie workflows can be parameterized(d) None of the mentionedThis question was addressed to me in final exam.My doubt is from Oozie with Hadoop topic in chapter Oozie, Orchestration, Hadoop Libraries and Utilities and Miscellaneous Hadoop Applications of Hadoop
Answer» The CORRECT answer is (b) All computation/processing tasks TRIGGERED by an mechanism node are REMOTE to Oozie Easy explanation: All computation/processing tasks are executed by Hadoop Map/Reduce framework.

152.	Nodes in the config _____________must be completed successfully.(a) oozie.wid.rerun.skip.nodes(b) oozie.wf.rerun.skip.nodes(c) oozie.wf.run.skip.nodes(d) all of the mentionedI had been asked this question during an internship interview.This intriguing question originated from Oozie with Hadoop in chapter Oozie, Orchestration, Hadoop Libraries and Utilities and Miscellaneous Hadoop Applications of Hadoop
Answer» The correct OPTION is (B) oozie.wf.rerun.skip.nodes Easiest explanation: If no CONFIGURATION is PASSED, existing coordinator/workflow configuration will be USED.

153.	Point out the correct statement.(a) Oozie is a Java Web-Application that runs in a Java servlet-container(b) Oozie workflow is a collection of actions arranged in a control dependency DAG(c) hPDL is a fairly compact language(d) All of the mentionedThis question was addressed to me in a job interview.I'm obligated to ask this question of Oozie with Hadoop topic in section Oozie, Orchestration, Hadoop Libraries and Utilities and Miscellaneous Hadoop Applications of Hadoop
Answer» The correct CHOICE is (d) All of the mentioned Best explanation: 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.

154.	Oozie can make _________ callback notifications on action start events and workflow end events.(a) TCP(b) HTTP(c) IP(d) All of the mentionedThe question was posed to me in an internship interview.Origin of the question is Oozie with Hadoop in portion Oozie, Orchestration, Hadoop Libraries and Utilities and Miscellaneous Hadoop Applications of Hadoop
Answer» Correct answer is (b) HTTP 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.

155.	___________ nodes are the mechanism by which a workflow triggers the execution of a computation/processing task.(a) Server(b) Client(c) Mechanism(d) ActionI got this question in an online quiz.The query is from Oozie with Hadoop in section Oozie, Orchestration, Hadoop Libraries and Utilities and Miscellaneous Hadoop Applications of Hadoop
Answer» The CORRECT answer is (d) Action The explanation is: Oozie provides SUPPORT for the following types of actions: Hadoop map-reduce, Hadoop file SYSTEM, Pig, Java and Oozie sub-workflow.

156.	A workflow definition is a ______ with control flow nodes or action nodes.(a) CAG(b) DAG(c) BAG(d) None of the mentionedI got this question at a job interview.This intriguing question originated from Oozie with Hadoop topic in division Oozie, Orchestration, Hadoop Libraries and Utilities and Miscellaneous Hadoop Applications of Hadoop
Answer» Correct choice is (b) DAG To explain I WOULD SAY: Oozie does not support CYCLES in workflow definitions, workflow definitions MUST be a strict DAG.

157.	Which of the following is one of the possible state for a workflow jobs?(a) PREP(b) START(c) RESUME(d) ENDThe question was asked in my homework.My query is from Oozie with Hadoop topic in portion Oozie, Orchestration, Hadoop Libraries and Utilities and Miscellaneous Hadoop Applications of Hadoop
Answer» CORRECT answer is (a) PREP Easy explanation: Possible states for a WORKFLOW jobs are: PREP, RUNNING, SUSPENDED, SUCCEEDED, KILLED and FAILED.

158.	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 mentionedThis question was posed to me in semester exam.I'm obligated to ask this question of Oozie with Hadoop topic in section Oozie, Orchestration, Hadoop Libraries and Utilities and Miscellaneous Hadoop Applications of Hadoop
Answer» The correct OPTION is (c) Coordinator Explanation: OOZIE v2 can continuously RUN workflows based on TIME and data.

159.	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 mentionedThis question was addressed to me in final exam.Enquiry is from Oozie with Hadoop in portion Oozie, Orchestration, Hadoop Libraries and Utilities and Miscellaneous Hadoop Applications of Hadoop
Answer» The correct ANSWER is (d) None of the mentioned Easiest EXPLANATION: CYCLE in workflows are not supported.

160.	Oozie Workflow jobs are Directed ________ graphsof actions.(a) Acyclical(b) Cyclical(c) Elliptical(d) All of the mentionedThe question was posed to me by my college professor while I was bunking the class.This interesting question is from Oozie with Hadoop in division Oozie, Orchestration, Hadoop Libraries and Utilities and Miscellaneous Hadoop Applications of Hadoop
Answer» The correct OPTION is (a) Acyclical To elaborate: Oozie is a framework ALLOWING to combine multiple Map/Reduce JOBS into a logical UNIT of work.

161.	___________ is a Java Web application used to schedule Apache Hadoop jobs.(a) Impala(b) Oozie(c) Mahout(d) All of the mentionedI have been asked this question by my college director while I was bunking the class.The doubt is from Oozie with Hadoop in section Oozie, Orchestration, Hadoop Libraries and Utilities and Miscellaneous Hadoop Applications of Hadoop
Answer» Right OPTION is (B) Oozie For EXPLANATION: Oozie is a workflow SCHEDULER system to manage Hadoop jobs.

162.	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 mentionedThe question was posed to me in homework.My query is from Oozie with Hadoop topic in chapter Oozie, Orchestration, Hadoop Libraries and Utilities and Miscellaneous Hadoop Applications of Hadoop
Answer» The CORRECT OPTION is (d) All of the mentioned The BEST I can explain: JOBS include streaming as well as system specific jobs.

163.	__________ 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 v5This question was posed to me in an international level competition.The query is from Oozie with Hadoop topic in portion Oozie, Orchestration, Hadoop Libraries and Utilities and Miscellaneous Hadoop Applications of Hadoop
Answer» Correct option is (c) Oozie v4 For explanation I WOULD say: Oozie combines multiple JOBS SEQUENTIALLY into one logical UNIT of work.

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