mapreduce多路径输入

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://RS5-112:9000/cs/path1,hdfs://RS5-112:9000/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://RS5-112:9000/cs/path1"), TextInputFormat.class,MultiTypeFileInput1Mapper.class);


MultipleInputs.addInputPath(job, new Path("hdfs://RS5-112:9000/cs/path3"), TextInputFormat.class,MultiTypeFileInput3Mapper.class);