ApacheCon EU 2014

With YARN, Apache Hadoop can deploy distributed applications —applications which can dynamically expand or contract their size based on demand or other factors. It allows the application to choose the placement of distributed components within the cluster, as well as their resource requirements such as CPUs and memory. As YARN evolves to support long-lived services, YARN applications can become services supporting broader uses.

Taking advantage of these features has required the application to be rewritten as a YARN application, central to which is the Application Master —a process which manages the allocation of components across the cluster, deployment of these components, as well as failure handling.

The Apache Slider project can deploy distributed applications without requiring them to be ported to YARN: Slider provides the Application Master and the allocation, deplo