//第一步，MapReduce后产生：用户，浏览职位，职位薪水
/* 1.map:
 * job.csv文件
 * key:jobid,value:job:job,salary
 * pv.csv文件
 * key:jobid,value:user,userid
 * 2.reduce:
 * key:userid,
 * value:jobid,salary
 * */