Section2:基本编程模型和一些例子 Section3:MapReduce的实现 Section4:编程模型的细化 Section5:性能评估 Section6:Google使用MapReduce的经验 Section7:未来的工作 Section2 Programming Model 2.1 Example Word Count map(String key, String value): // key: document name // value: document contents for each ...
使用函数模型,让用户编写Map和Reduce,让我们能够 轻易的大量并行化,并使用重新运算作为主要的容错机制。 Programming Model Map, written by the user, takes an input pair and produces a set of intermediate key/value pairs. The MapReduce library groups together all intermediate values associated with the s...
2004年12月5日,Google在美国旧金山召开的第6届操作系统设计与实现研讨会(Operating Systems Design and Implementation,OSDI)上,发表了论文《MapReduce: Simplified Data Processing on Large Clusters》(MapReduce:超大集群的简单数据处理),向全世界介绍了MapReduce系统的编程模式、实现、技巧、性能和经验。基于MapReduce编...
MapReduceProgrammingModel InspiredfrommapandreduceoperationscommonlyusedinfunctionalprogramminglanguageslikeLisp.Usersimplementinterfaceoftwoprimarymethods:◦1.Map:(key1,val1)→(key2,val2)◦2.Reduce:(key2,[val2])→[val3]Manyrealworldtasksareexpressibleinthismodel.Assumption:datahasnocorrelation,oritis...
Programming Model MapReduce 的模型原理是:对 input key/value pairs 对进行处理,生成对应的 output key/value pairs,这两步通过 Map 函数和 Reduce 函数来完成。 Map:由用户编写,接受一个 input key/value pair ,生成一个 intermediate key/value pairs 的集合,MapReduce Libray 将所有具有相同 intermediate key...
Google’s MapReduce programming model serves for processing large data sets in a massively parallel manner. We deliver the first rigorous description of the model including its advancement as Google’s domain-specific language Sawzall. To this end, we reverse-engineer the seminal papers on MapReduce...
Lammel, R.: Google’s MapReduce Programming Model - Revisited. Science of Computer Programming 70, 1–30 (2008) MathSciNetLämmel, R.: Google’s MapReduce programming model – revisited. Science of Computer Programming 70(1), 1–30 (2008) MathSciNet MATH...
MapReduce:In 2004, Google shared the MapReduce programming model that simplifies data processing on large clusters. The Apache Hadoop project is an open source implementation of the MapReduce algorithm that was subsequently created by the community. ...
MapReduce Programming Model Input & Output: sets of <key, value> pairs Programmer writes 2 functions: map (in_key, in_value) -> list(out_key, intermediate_value) Processes <k,v> pairs Produces intermediate pairs reduce (out_key, list(interm_val)) -> list(out_value) Combines intermedia...
R. Lammel, Google's MapReduce Programming Model – Revisited, 45 pages (Year: 2008) Primary Examiner: DAO, THUY CHAN Attorney, Agent or Firm: GOOGLE (Cranford, NEW JERSEY, US) Claims: 1.(canceled) 2.A computer implemented method comprising:receiving a plurality of parallel data objects;rece...