1. A method, comprising: performing data processing functions at each of a plurality of processor nodes including performing data processing functions at a first processor node in a first data processing role, in a distributed computing system having said plurality of processor nodes; selecting a first mode of operation of a distributed node service management system by said plurality of processor nodes in said distributed computing system including said first processor node; and in response to selection of a first mode of operation of the distributed node service management system, configuring said first processor node to also perform distributed node service management in a first distributed node service management role as a function of the selected first mode of operation, wherein the distributed node service management in the first distributed node service management role at said first processor node includes processing a service request for servicing the distributed computing system.