在job页面添加一条代码:
job.setOutputFormatClass(num.class);
新建一个类,里面继承 TextOutputFormat 类复写 getDefaultWorkFile 方法.
在return new Path(committer.getWorkPath(), "num");中更改输出文件的名字
package com.test.map; import java.io.IOException; import org.apache.hadoop.fs.Path; import org.apache.hadoop.mapreduce.RecordWriter; import org.apache.hadoop.mapreduce.TaskAttemptContext; import org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter; import org.apache.hadoop.mapreduce.lib.output.TextOutputFormat; public class num extends TextOutputFormat{ @Override public Path getDefaultWorkFile(TaskAttemptContext context, String extension) throws IOException { FileOutputCommitter committer = (FileOutputCommitter) getOutputCommitter(context); return new Path(committer.getWorkPath(), "num");//getOutputName(context) } }