BigData Hadoop - Interview Questions and Answers - Multiple Choice - Objective

Q1. What is the difference between namenode and datanode in Hadoop? show Answer

Ans. NameNode stores MetaData (No of Blocks, On Which Rack which DataNode is stored etc) whereas the DataNode stores the actual Data.

Q2. Which is the default Input Formats defined in Hadoop ? a. SequenceFileInputFormat b. ByteInputFormat c. KeyValueInputFormat d. TextInputFormat show Answer

Ans. TextInputFormat

Q3. Which of the following is not an input format in Hadoop ? a. TextInputFormat b. ByteInputFormat c. SequenceFileInputFormat d. KeyValueInputFormat show Answer

Ans. ByteInputFormat

Q4. Which of the following is a valid flow in Hadoop ? a. Input -> Reducer -> Mapper -> Combiner -> -> Output b. Input -> Mapper -> Reducer -> Combiner -> Output c. Input -> Mapper -> Combiner -> Reducer -> Output d. Input -> Reducer -> Combiner -> Mapper -> Output show Answer

Ans. Input -> Mapper -> Combiner -> Reducer -> Output

Q5. MapReduce was devised by ... a. Apple b. Google c. Microsoft d. Samsung show Answer

Ans. Google

Q6. Which of the following is not a phase of Reducer ? a. Map b. Reduce c. Shuffle d. Sort show Answer

Ans. Map

Q7. How many instances of Job tracker can run on Hadoop cluster ? a. 1 b. 2 c. 3 d.4 show Answer

Ans. 1

Q8. Which of the following is not the Dameon process that runs on a hadoop cluster ? a. JobTracker b. DataNode c. TaskTracker d. TaskNode show Answer

Ans. TaskNode