RE: Getting filename in case of MultipleInputs

[Devaraj k]

Hi Subbu,



   I am not sure which input format you are using. If you are using 
FileInputFormat, you can get the file name this way in map function..





import org.apache.hadoop.mapred.FileSplit;
import org.apache.hadoop.mapreduce.InputSplit;
import org.apache.hadoop.mapreduce.Mapper;

public class TestMapper extends Mapper<Object, Object, Object, Object> {

  private String fileName;

  public void setup(
      org.apache.hadoop.mapreduce.Mapper<Object, Object, Object, 
Object>.Context context)
      throws java.io.IOException, InterruptedException {
    InputSplit inputSplit = context.getInputSplit();
    fileName = ((FileSplit) inputSplit).getPath().getName();
  }

  protected void map(
      Object key,
      Object value,
      org.apache.hadoop.mapreduce.Mapper<Object, Object, Object, 
Object>.Context context)
      throws java.io.IOException, InterruptedException {

    // you can use the fileName here
    System.out.println(fileName);
  }
}








Thanks

Devaraj

________________________________
From: Kasi Subrahmanyam [kasisubbu...@gmail.com]
Sent: Thursday, May 03, 2012 6:25 PM
To: mapreduce-user@hadoop.apache.org
Subject: Getting filename in case of MultipleInputs

Hi,

Could anyone suggest how to get the filename in the mapper.
I have gone through the JIRA ticket that map.input.file doesnt work in case of 
multiple inputs,TaggedInputSplit also doesnt work in case of 0.20.2 version as 
it is not a public class.
I tried to find any other approach than this but i could find none in the search
Could anyone suggest a solution other tan these



Thanks in advance;
Subbu.