一个可以找到并发事件的算法。程序运用了闭包搜寻矩阵的算法。-It is important in distributed computer systems to identify those events (at identifiable points in time) that are concurrent, or not related to each other in time. A group of concurrent events may sometimes attemp

hadoop实现矩阵乘法 输入文件是M#i#j#Mij-hadoop achieve matrix multiplication input file is M# i# j# Mij