Work tree andmassively parallel processing

A mechanism is considered, summarizing MapReduce. A special attention is paid to the methods of distribution of works for concurrent execution. It is assumed that simple works form a tree and there is a coordinator who is responsible for the division of complex works. Workers execute simple works only. It appears that on the order of tree of traversal works substantially depends complexity of renewals after the refuse of site. Main attention is paid to the methods of tree traversal operation.