Mapr (HP) Hadoop Developer Certification Questions and Answers (Dumps and Practice Questions)

Question : Which HDFS command copies an HDFS file named foo to the local filesystem as localFoo?


1. hadoop fs -get foo LocalFoo
2. hadoop -cp foo LocalFoo
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4. hadoop fs -put foo LocalFoo

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Question : Which one of the following statements describes the relationship between the NodeManager and the ApplicationMaster?


1. The ApplicationMaster starts the NodeManager in a Container
2. The NodeManager requests resources from the ApplicationMaster
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4. The NodeManager creates an instance of the ApplicationMaster

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Question : Which one of the following statements is FALSE regarding the communication between DataNodes and a federation of NameNodes in Hadoop .?


1. Each DataNode receives commands from one designated master NameNode.
2. DataNodes send periodic heartbeats to all the NameNodes.
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4. DataNodes send periodic block reports to all the NameNodes.

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Related Questions

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Question :

Is there anyway in the MapReduce model that reducers communicate with each other in Hadoo framework ?


1. Yes, using JobConf configuration object it is possible
2. Using distributed cache it is possible
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4. No, each reducers runs independently and in isolation.






1. A
2. B
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4. D




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1. A
2. B
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4. D
5. E




Question :
How do you differentiate between failed task and killed task



1. A
2. B
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4. D


Question :

Using combiner you can reduce...


1. The number of values across different keys in the iterator supplied to a single reduce method call.
2. The amount of intermediate data that must be transferred between the mapper and reducer.
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4. The number of output files a reducer must produce.




Question :

What is true about combiner ?


1. Combiner does the local aggregation of data, thereby allowing the number of mappers to process input data faster.
2. Combiner does the local aggregation of data, thereby reducing the number of mappers that need to run.
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