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MapReduce Online Assessment Test

Topics Covered

  • File System Counter
  • Hadoop Supplied Interfaces
  • MapReduce Version 2 Process
  • MapReduce Job methods

Useful for hiring

  • Hadoop Developer - MapReduce
  • Big Data Developer - MapReduce

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Question

How many maps can run parallelism per node?

Answer
    • 1-10

    • 10-100

    • 100-150

    • 150-200

Question

We have an object Student who is giving a test in Java and it has four attributes (String studentId, String studentName, String subject, int point ) to define the point of each subject that student get for three years.

If we use the partitioner as below:
public int getPartition(Customer key, int numPartitions) {
        int hash = key.getStudentId().hashCode() + key.getSubject().hashCode();
        int partition = hash % numPartitions;
        return partition;
}

What can be a key group to the reducer if 4 students have a point of 8 subjects and 6 students have a point with 6 subjects?

Answer
    • 48

    • 44

    • 68

    • 24

Question

Which stage will group input by key?

Answer
    • sort

    • shuffle

    • reduce

    • None of the mentioned

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