MCQs on Big Data Analytics

The main goal of MapReduce is to:

• Scale vertically by upgrading hardware

• Simplify distributed data processing

• Replace relational databases

• Provide encryption for data

The "Word Count" program in MapReduce produces:

• Total number of characters

• List of words and their occurrence counts

• Sentence length analysis

• Document similarity scores

Which company originally described the MapReduce paradigm?

• Yahoo

• IBM

• Google

• Facebook

Hadoop's implementation of MapReduce is primarily written in:

• Python

• Java

• Scala

• C++

Which distributed filesystem is used by Hadoop?

• FAT32

• NTFS

• HDFS

• ZFS

Which of the following is a user component of MapReduce?

• Input Splitter

• Master

• Mapper

• Output Committer

The default input split size in Hadoop MapReduce is:

• 16 MB

• 32 MB

• 64 MB

• 128 MB

The reducer ensures that:

• All outputs are encrypted

• Keys are distributed randomly

• All values with the same key go to the same reducer

• Each key is assigned to multiple reducers

Which component reduces the output of each mapper before sending it to reducers?

• Combiner

• Input Splitter

• Partitioner

• Master

The default partitioner uses:

• Random assignment

• Round-robin distribution

• Key.hashCode() % number_of_reducers

• Key length