A cluster system includes an interface and a processor. The interface is to receive a request from a user associated with one of a plurality of shells. The processor is to determine a plurality of tasks to respond to the request; determine a local set of data and a shared set of data for a task of the plurality of tasks, wherein the local set of data is associated with the one of the plurality of shells; and provide the task, a local set indication, and a shared set indication to a worker associated with the task, wherein the local set indication refers to the local set of data and the shared set indication refers to the shared set of data.