Application Scenarios

YARN is a distributed resource management system that is used to improve resource usage in the distributed cluster environment. Resources include memory, I/O, network resources, and disk resources. YARN is developed to address the shortage of the original MapReduce framework. Initially, MapReduce's committers were able to modify the existing codes periodically. As codes increase and due to the problems in the design of the original MapReduce framework, the modification becomes increasingly difficult. Therefore, MapReduce's committers decides to redesign the framework with enhancements to scalability, availability, reliability, and compatibility, increasing the resource usage of next-generation MapReduce(MRv2/Yarn) and supporting more computing frameworks apart from MapReduce.