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
).