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

Question :Is there a map input format?


1. Yes, but only in Hadoop 0.22+
2. Yes, there is a special format for map files
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4. Both 2 and 3 are correct answers.



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Explanation: Map files are just a variation of sequence files. They store data in sorted order







Question :What is the most important feature of map-reduce



1. Ability to store large amount of data
2. Ability to process data on the cluster of the machines without copying all the data over
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4. Ability to process large amounts of data in parallel



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Explanation: The fundamental difference of the Hadoop framework is that multiple machines will be used to process the same data and data is readily available for processing in distributed
file system







Question :What is the role of the namenode (MRv)?

1. Namenode splits big files into smaller blocks and sends them to different datanodes
2. Namenode is responsible for assigning names to each slave node so that they can be identified by the clients
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4. Both 2 and 3 are valid answers




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Explanation: The namenode is the "brain" of the Hadoop cluster and responsible for managing the distribution blocks on the system based on the replication policy. The namenode also supplies
the specific addresses for the data based on the client requests

Related Questions

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Question : Which of the following is/are responsibilities of InputFormat?



1. Validate the input files and directories that exist for the job

2. Split the input files into InputSplits

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4. 1,2

5. 1,2,3



Question : Select the correct statement regarding input split and block size



1. input split may be smaller the block size

2. input split may be larger the block size

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4. 1,2
5. 1,2,3


Question : Which of the following are the methods available in a InputFormat class and needs to be implemented?



1. getSplits()

2. createRecordReader()

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4. 1,2

5. 1,2,3



Question : When you change the size of inputSplit with configuration, what would be impact?



1. It will change number of reducer for a particular job processing this file.

2. It will change number of mapper for a particular job processing this file.

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4. 1,2

5. 1,2,3



Question : Select correct statement regarding inputSplit



1. Last record of inputsplit will always be a complete record

2. Last record of inputsplit may be complete or incomplete

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4. 1,2

5. 1,2,3



Question : What is the purpose of "CombineFileSplit" ?



1. combines multiple files into a single split

2. combines multiple splits into a single split

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4. 1,2

5. 1,2,3