Search results
Results From The WOW.Com Content Network
MapReduce is a programming model and an associated implementation for processing and generating big data sets with a parallel and distributed algorithm on a cluster. [1] [2] [3]A MapReduce program is composed of a map procedure, which performs filtering and sorting (such as sorting students by first name into queues, one queue for each name), and a reduce method, which performs a summary ...
obj.reduce(func, initial) obj.reduce(func) Where func receives as arguments the result of the previous operation (or the initial value on the first iteration); the current item; the current item's index or key; and a reference to the obj: Clojure (reduce func initval list) (reduce func initval (reverse list)) (reduce func list) (reduce func ...
[2] [3] [4] The reduction of sets of elements is an integral part of programming models such as Map Reduce, where a reduction operator is applied to all elements before they are reduced. Other parallel algorithms use reduction operators as primary operations to solve more complex problems.
Therefore, compilers will attempt to transform the first form into the second; this type of optimization is known as map fusion and is the functional analog of loop fusion. [2] Map functions can be and often are defined in terms of a fold such as foldr, which means one can do a map-fold fusion: foldr f z . map g is equivalent to foldr (f .
Data mapping; Code generation; Code execution; Data review; These steps are often the focus of developers or technical data analysts who may use multiple specialized tools to perform their tasks. The steps can be described as follows: Data discovery is the first step in the data transformation process. Typically the data is profiled using ...
MapBasic is based on the BASIC family of programming languages. [ 1 ] MapBasic also allows programmers to develop software in popular programming languages such as C , C++ and Visual Basic and use these with the MapInfo Professional GIS to create geographically based software, such as electronic mapping.
Explicit parallelism is one of the main reasons for the poor performance of Enterprise Java Beans when building data-intensive, non-OLTP applications. [ citation needed ] Where a sequential program can be imagined as a single worker moving between tasks (operations), a dataflow program is more like a series of workers on an assembly line , each ...
The basic steps in the Texas Tommy were followed by a breakaway identical to that found in the Lindy. Savoy dancer "Shorty" George Snowden told Marshall Stearns in 1959 that "We used to call the basic step the Hop long before Lindbergh did his hop across the Atlantic. It had been around a long time and some people began to call it the Lindbergh ...