In a modern Hadoop deployment used by a regional transit agency, how does MapReduce relate to YARN?
Select an answer to reveal the explanation.
Short Explanation
YARN is the traffic controller handing out lanes; MapReduce is one kind of convoy using those lanes. In modern Hadoop, MR applications request containers through YARN. MR does not swallow HDFS into the ResourceManager's memory.
Full Explanation
In Hadoop 2+, YARN is the cluster resource manager and MapReduce is one application framework that obtains containers through it. That separation lets multiple compute engines share the cluster. MapReduce does not replace HDFS storage, and YARN is not merely a SQL dialect.