大数据处理实践探索 ---- 笔试面试考点：Yarn (基础知识)

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简介

作为资源调度，集群管理的利器，中国的大数据公司使用YARN 非常多。

下面的话来自官网，可以默写并背诵：

The fundamental idea of YARN is to split up the functionalities of resource management and job scheduling/monitoring into separate daemons. The idea is to have a global ResourceManager (RM) and per-application ApplicationMaster (AM). An application is either a single job or a DAG of jobs.

The ResourceManager and the NodeManager form the data-computation framework. The ResourceManager is the ultimate authority that arbitrates resources among all the applications in the system. The NodeManager is the per-machine