YARN, also called MapReduce 2.0, is like a traffic cop that controls the allocation of resources in a system.

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YARN is a resource manager that manages resources (such as CPU and memory) in a Hadoop cluster and allocates them to running applications. It allows multiple data processing engines (such as MapReduce, Spark, and Impala) to run on the same cluster, making it a more efficient and flexible system.

YARN, Also Called MapReduce 2