MC	Which components does the base Hadoop stack include?	HDFS, Map and Reduce.	incorrect	NDFS, MapReduce, and YARN.	incorrect	HDFS, MapReduce and YARN.	correct	HDFS, Spark and YARN.	incorrect	
MC	Which of the following is not one of the reasons why Spark programs are generally faster than MapReduce operations?	Because Spark tries to keep its RDDs in memory as long as possible.	incorrect	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 RDD transformations are "lazily" applied.	incorrect	
MC	Which statement is NOT CORRECT?	Spark SQL exposes DataFrame and Dataset APIs which underlyingly use RDDs together with a performant SQL query engine.	incorrect	Spark SQL can be used through ODBC and JDBC interfaces.	incorrect	Spark SQL can be used from within Java, Python, Scala and R.	incorrect	Spark SQL DataFrames need to be created by loading a file.	correct	
MC	Which statement is CORRECT?	The HDFS NameNode sends regular heartbeat messages to its DataNodes.	incorrect	HDFS is composed of a NameNode, DataNodes, and an optional SecondaryNameNode.	correct	DataNodes in HDFS store a registry of metadata.	incorrect	Both the SecondaryNameNode and primary NameNode can simultaneously handle requests from clients.	incorrect	
MC	Which statement is CORRECT?	HDFS is composed of a NameNode, DataNodes, and an optional SecondaryNameNode.	correct	Both the SecondaryNameNode and primary NameNode can simultaneously handle requests from clients.	incorrect	DataNodes in HDFS store a registry of metadata.	incorrect	The HDFS NameNode sends regular heartbeat messages to its DataNodes.	incorrect	
MC	Which statement is CORRECT?	HBase works well on large clusters as well as small ones having a few nodes.	incorrect	MapReduce programs cannot be used with HBase. Data is accessed using simple put and get commands instead.	incorrect	HBase offers a SQL engine to query its data.	incorrect	HBase can be considered as a NoSQL database.	correct	
MC	Which statement is NOT CORRECT?	RDDs offer failure protection by tracking the lineage of operations that are applied on them.	incorrect	In MapReduce, the reducing can start before the mappers have finished.	incorrect	Hive queries run much faster than hand-written MapReduce programs.	correct	HDFS's high emphasis on fault tolerance results in data replication.	incorrect	
MC	Which statement is CORRECT?	Spark SQL can be used through ODBC and JDBC interfaces.	correct	The YARN ApplicationMaster contains a scheduler which will hold submitted jobs in a queue until they are deemed ready to start.	incorrect	Hive queries run much faster than hand-written MapReduce programs.	incorrect	Apache Spark doesn't enforce a relatively linear and fixed data flow structure. 	incorrect	
MC	Which statement is CORRECT?	The 5V's of Big Data do not take economic value into account.	incorrect	Hive applies a 'schema on query' approach.	incorrect	A MapReduce program can be implemented in an easy, straightforward manner.	incorrect	YARN's JobHistoryServer keeps a log of all finished jobs.	correct	
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 RDD transformations are "lazily" applied.	incorrect	Because Spark tries to keep its RDDs in memory as long as possible.	incorrect