Interview Questions and Answers for 'Map' | Search Interview Question

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Q61. 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

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

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Q62. MapReduce was devised by ...

a. Apple
b. Google
c. Microsoft
d. Samsung

Ans. Google

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Q63. Which of the following is not a phase of Reducer ?

a. Map
b. Reduce
c. Shuffle
d. Sort

Ans. Map

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Q64. What is the input to the Reduce function ?

a. One Key and One Value
b. Multiple Keys and Multiple associated Values
c. Multiple Keys and One associated values with each
d. One key and associated values.

Ans. One key and associated values.

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Q65. Which of the following is the implementation language for Map Reduce Framework ?

a. Big Data
b. Hadoop
c. Java
d. C++

Ans. Java

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Recently asked in Sophos

Q66. Write a Method to get a map of words and their count by passing in the string

Core Java

Ans. http://javasearch.buggybread.com/CodeSnippets/searchCodeSamples.php?keyword=Method+to+get+a+map+of+words&category=code

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Q67. What is unmodifiable set / unmodifiable map ? How can we create one ?

Ans. It is an unmodifiable / read only view of the underlying collection. We can use

Collections.unmodifiableSet(Set set)
Collections.unmodifiableMap(Map map)
Collections.unmodifiableCollection(Collection collection)

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Q68. Which of the following collections stores its elements in natural sorting order ?

Core Java

a. HashMap

b. LinkedHashMap

c. TreeMap

d. EnumMap

Ans.c. TreeMap

Q69. Semaphores are used to solve problem of ...

Operating system

a. Race Condition

b. Process Synchronization

c. Mutual Exclusion

d. All of above

Ans.d. All of above

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