Task Node Services and Topology

Task Nodes run the TaskTracker and Fileserver services. The Fileserver service is required, because TaskTrackers require local storage for intermediate data.

Node Topology settings prevent the cluster from storing unrelated data on the Task Node. You must assign a Task Node to the /compute-only topology, which has no storage volumes assigned to it. (The topology name is unimportant, so long as it has no storage assigned to it.) By contrast, nodes for data storage are generally assigned to the /data topology (or a sub-topology of /data).