MapR;

In my opinion, edge nodes in a Hadoop cluster are typically nodes that are responsible for running the client-side operations of a Hadoop cluster. Typically edge-nodes are kept separate from the nodes that contain Hadoop services such as HDFS, MapReduce, etc, mainly to keep computing resources separate. For smaller clusters only having a few nodes, it's common to see nodes playing a hybrid combination of roles for master services (JT, NN, etc.) , slave services (TT, DN, etc) and gateway services. Note that running master and slave Hadoop services on the same node is not an ideal setup, and can