MC	Which statement is NOT CORRECT?	A mapper in Hadoop maps each element in a collection to one or more output elements.	incorrect	A MapReduce pipeline in Hadoop can include an optional Sorter to sort the final output.	incorrect	Reducer workers in Hadoop will start once all mapper workers have fished.	correct	A reducer in Hadoop reduces a collection of elements to one or more output elements.	incorrect	
MC	Which statement is CORRECT?	Reducer workers in Hadoop will start once all mapper workers have fished.	incorrect	The Hive executer takes the MapReduce stages and sends these to Hadoop Common.	incorrect	MLlib is originally built on Spark SQL's DataFrames-based API.	correct	The original idea behind Big Data technologies is to provide extensive query facilities.	incorrect	
MC	Which statement is NOT CORRECT?	A mapper in Hadoop maps each element in a collection to one or more output elements.	incorrect	A reducer in Hadoop reduces a collection of elements to one or more output elements.	incorrect	A MapReduce pipeline in Hadoop can include an optional Sorter to sort the final output.	incorrect	Reducer workers in Hadoop will start once all mapper workers have fished.	correct	
MC	Pig is...	A database which runs on Hadoop.	incorrect	A project offering a programming language to provide more user-friendliness compared to MapReduce programs.	correct	A programming language that can be used to query HDFS data.	incorrect	A SQL engine which runs on top of Hadoop.	incorrect	
MC	What do the 5 V's of Big Data stand for?	Volume, Visualization, Velocity, Variety, Value.	incorrect	Volume, Variety, Velocity, Variability, Value.	incorrect	Volume, Variety, Velocity, Veracity, Value.	correct	Volume, Versatile, Velocity, Visualization, Value.	incorrect	
MC	Which statement is NOT CORRECT?	NodeManagers in YARN are responsible for setting up containers on the node hosting a particular (sub)task.	incorrect	Spark Streaming performs streaming analytics.	incorrect	A MapReduce program can be implemented in an easy, straightforward manner.	correct	HBase can be considered as a NoSQL database.	incorrect	
MC	What do the 5 V's of Big Data stand for?	Volume, Variety, Velocity, Variability, Value.	incorrect	Volume, Versatile, Velocity, Visualization, Value.	incorrect	Volume, Variety, Velocity, Veracity, Value.	correct	Volume, Visualization, Velocity, Variety, Value.	incorrect	
MC	Which of the following schema handling methods does Hive apply?	Schema on read	correct	Schema on write	incorrect	Schema on query	incorrect	Schema on load	incorrect	
MC	Which statement is NOT CORRECT?	Reducer workers in Hadoop will start once all mapper workers have fished.	correct	A mapper in Hadoop maps each element in a collection to one or more output elements.	incorrect	A MapReduce pipeline in Hadoop can include an optional Sorter to sort the final output.	incorrect	A reducer in Hadoop reduces a collection of elements to one or more output elements.	incorrect	
MC	Which of the following is not one of the reasons why Spark programs are generally faster than MapReduce operations?	Because Spark uses a directed acyclic graph instead of MapReduce.	incorrect	Because Mesos can be used as a resource manager instead of YARN.	correct	Because Spark tries to keep its RDDs in memory as long as possible.	incorrect	Because RDD transformations are "lazily" applied.	incorrect