Then MapReduce shuffles the map output by key and does another parallel computation on the redistributed map output, writing the results to the file system in the Reduce phase of the computation.
Different applications of P2P networks enable users to share the computation power (distributed systems), data (file-sharing), and bandwidth (using many nodes for transferring data).
Turning off Selection Information computation will cause time estimates and file counts to not appear and the progress bar to not function during backup and restore operations.