YARN : The Next Generation Hadoop Framework
MapReduce framework for processing Bigdata has undergone a complete change in its architecture and functionalities from hadoop-0.23 onwards. MapReduce 2.0 (MRv2) or YARN (Yet Another Resource Negotiator) is the nomenclature with which it is popularly known.
There has been a significant change in terms of resource management and application management along with solutions for problems in MRV1, like under utilization of cluster resources, single point of failure of Namenode etc. Hadoop2 (YARN) allows workloads to share cluster resources dynamically between varieties of processing frameworks like MapReduce.