Spark 基本JAVA函数的的使用方法8

combineByKey函数测试cogroup函数原型一共有九个,最多可以组合四个RDD。[测试cogroup函数]原始数据如下<1>:1,3|1,2|2,4|2,3|2,3|[测试cogroup函数]原始数据如下<2>:3,3|4,2|5,4|5,3|====================================[测试cogroup函数]返回结果:[(4,([],[2])),(1,([3,2],[])),(5,([],[4,3])),(2,([4,3,3],[])),(3,([],[3]))]lookUp函数测试,就像使用map的get方法一样，根据Key查询Value <无> .CodeEntity .code_pieces ul.piece_anchor{width:25px;position:absolute;top:25px;left:-30px;z-index:1000;}.CodeEntity .code_pieces ul.piece_anchor li{width:25px;background: #efe;margin-bottom:2px;}.CodeEntity .code_pieces ul.piece_anchor li{border-left:3px #40AA63 solid;border-right:3px #efe solid;}.CodeEntity .code_pieces ul.piece_anchor li:hover{border-right:3px #40AA63 solid;border-left:3px #efe solid;}.CodeEntity .code_pieces ul.piece_anchor li a{color: #333;padding: 3px 10px;}.CodeEntity .code_pieces .jump_to_code{visibility:hidden;position:relative;}.CodeEntity .code_pieces .code_piece:hover .jump_to_code{visibility:visible;}.CodeEntity .code_pieces .code_piece:hover .jump_to_code a{text-decoration:none;}.CodeEntity .code_pieces h2 i{float:right;font-style:normal;font-weight:normal;}.CodeEntity .code_pieces h2 i a{font-size:9pt;background: #FFFFFF;color:#00A;padding: 2px 5px;text-decoration:none;}