1.多路径输入
1）FileInputFormat.addInputPath 多次调用加载不同路径
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
String in0 = args[0];
String in1 = args[1];
String out = args[2];
FileInputFormat.addInputPath(job,new Path(in0));
FileInputFormat.addInputPath(job,new Path(in1));
FileOutputFormat.setOutputPath(job,new Path(out));2）FileInputFormat.addInputPaths一次调用加载 多路径字符串用逗号隔开
FileInputFormat.addInputPaths(job, "hdfs://localhost:9000/cs/path1,hdfs://localhost:9000/cs/path2");2.多种输入
MultipleInputs可以加载不同路径的输入文件，并且每个路径可用不同的maper
MultipleInputs.addInputPath(job, new Path("hdfs://localhost:9000/cs/path1"), TextInputFormat.class,MultiTypeFileInput1Mapper.class);
MultipleInputs.addInputPath(job, new Path("hdfs://localhost:9000/cs/path3"), TextInputFormat.class,MultiTypeFileInput3Mapper.class);
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