Hadoop Online Test

Topics covered

Data Replication
Parquet File
Resource Manager
Sequence File
Task Tracker
Mapper / Reducer Task

  • MAQ (Multiple Answer Question)
  • MCQ (Multiple Choice Question)
  • Descriptive Question
  • White Board Simulator
  • Coding Simulator
  • Audio Question
  • Video Question
  • Case Study Question

Hadoop is an open source scalable framework (sponsored by Apache Software Foundation) that allows distributed processing of large data sets across clusters of computers using set of programming modules like Hadoop Common, HDFS, YARN, MapReduce. Hadoop library is designed to detect and handle failures at the application layer.

Hadoop online test helps recruiters and hiring managers to assess skills like Hadoop programming, ability to work with data replication in HDFS, resource manager etc. Interview Mocha’s Hadoop assessment test is created & validated by experienced subject matter experts (SMEs) to assess & hire Hadoop developers as per industry standards.
Hadoop skill assessment test helps you to screen the candidates who possess traits as follows:
  1.  Deep understanding of Apache Hadoop and surrounding technologies like Pig, HBase, Avro
 2.  Ability to efficiently work on Hadoop development & its implementation
 3.  Ability to work with Hadoop HDFS, YARN, MapReduce
 4.  Strong understanding of integration techniques like ETL
 5.  Ability to work with workflow schedulers like Oozie, column-oriented data store parquet

Interview Mocha’s Hadoop developer online test has a unique set of questions. You can also create or ask us to create a customized test that includes questions which are specific to your job-requirement.
Our powerful reporting helps you to analyze section wise performance of candidate to gauge his strengths and weaknesses. Moreover, you can always use our candidate ranking tool to screen best performing candidate amongst others.

This pre-employment test is useful for hiring:
  • Hadoop Developer
  • Big Data Hadoop Developer
  • Hadoop Application Developer
  • Hadoop specialist
  • Hadoop analyst


Test details:

Hadoop pre-employment test will evaluate candidate’s practical knowledge and will identify whether the candidate is ready to be employed. Hadoop online test can be taken by the candidates from anywhere at the comfort of their time zone.

Hadoop skill test may contain MCQ's (Multiple Choice Questions), MAQ's (Multiple Answer Questions), Fill in the Blank, Descriptive, Whiteboard Questions, Audio / Video Questions, True or False.

Test Duration: 20 minutes
Questions: 20

Hadoop Online Test

Question #1 of 3

You plan to use a combiner to reduce the amount of data sent to Reducer. Your output from the Mapper is . Which of the following should you subclass for using the combiner?

    • Combiner<IntWritable,Text,IntWritable,Text>

    • Combiner<Text,Text,IntWritable,IntWritable>

    • Reducer<IntWritable,Text,IntWritable,Text>

    • Mapper<IntWritable,Text,IntWritable,Text>

Question #2 of 3

In order to apply a combiner, which property has to be satisfied by the values emitted from the mapper?

    • Combiner can be applied always to any data

    • Output of the mapper and output of the combiner has to be same key value pair and they can be heterogeneous

    • The output of the mapper and output of the combiner has to be same key value pair

    • Only if the values satisfy associative and commutative property it can be done

Question #3 of 3

In a MapReduce program, the reducer receives all values associated with the same key. Which statement is most accurate about the ordering of these values?

    • The values will be ordered in which they were emitted from the mappers.

    • Values are in sorted order.

    • values are arbitrarily ordered, but multiple runs of the same MapReduce job will have the same ordering.

    • Since the values come from mappers o/p, there will be contiguous sections of sorted values.

    • The values are arbitrarily ordered, and the ordering may vary from run to run of the same MapReduce job.

Candidate Name
Assessment Name
Invited by
Assessment Date
IP Address

24.00 Out of 40.00
23 Minutes

Java EE




Oracle PL/SQL


Analytical Thinking


Note:If score<= 30% then its a Weakness. If score >=70% then its a Strength.


Java EE, Oracle PL/SQL, Analytical Thinking




It was a good test for me, the questions were on the latest technology of java on which I am currently working. It was a great experience. Thank you!

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