Akro
To add on, if you want to ignore the key part then substitute key with
NullWritable. And do the desired modification in driver class in place of
output key type.
Hope it helps
Regards
Bejoy K S
-----Original Message-----
From: bejoy.had...@gmail.com
Date: Thu, 15 Sep 2011 04:09:12
To: <mapreduce-user@hadoop.apache.org>
Reply-To: bejoy.had...@gmail.com
Subject: Re: Reducers without output files
Hi Akro
You can achieve the same within the existing mapreduce frame work
itself. Give a NullWritable in place of reducer output value in reduce
function. In your driver class as well mention the output value type as
NullWritable.
------Original Message------
From: Arko Provo Mukherjee
To: mapreduce-user@hadoop.apache.org
ReplyTo: mapreduce-user@hadoop.apache.org
Subject: Reducers without output files
Sent: Sep 15, 2011 08:56
Hello Everyone,
I have a small issue with my Reducer that I am trying to figure out
and wanted some advice.
In the reducer, when writing to the output file as declared in
FileOutputFormat.setOutputPath() I want to write only the key and not
the value when I am calling output.collect().
Is there a way I can ignore the key part?
Else,
Can I write a Reducer function that doesn't do a output.collect()??
Say I omit the FileOutputFormat.setOutputPath() in the Driver Class.
I can then manually write the output to HDFS in the format I like.
Is this legal way to do stuff?
Many thanks in advance!
Warm Regards
Arko
Regards
Bejoy K S
