MapReduce程序中往Mapper中传参

通过配置传参

 conf.set("tableLongA","tla");
 conf.set("tableKeyA","tka");
 conf.set("tableColumnA","tca");

使用context对象获取参数

context.getConfiguration().get("tableLongA")
context.getConfiguration().get("tableKeyA")
context.getConfiguration().get("tableColumnA")