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From: Jason Yang <lin.yang.jason@gmail.com>
Date: Mon, 17 Sep 2012 15:16:57 +0800
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 <CAE636z95G-JmVJV+=ddiLrKCeB5hRjn5v743gru0St47v6MfPQ@mail.gmail.com>
Subject: How to output according to the key in reducer?
To: user@hadoop.apache.org
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Hi, all

I was wondering how to write all the input with the same key to a single
file in the reducer ?

say, I got some intermediate outputs from mappers like that:
key     value
--------------------
1   annie
2   Jason
1   andy
2   Joey
1   andrew
...

and I would like write all the intermediate outputs with key 1 to file
"ID_1.dat", and all the intermediate outputs with key 2 to file "ID_2.data".

how could I achieve that?

-- 
YANG, Lin

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Hi, all<div><br></div><div>I was wondering how to write all the input with =
the same key to a single file in the reducer ?</div><div><br></div><div>say=
, I got some intermediate outputs from mappers like that:=A0</div><div>key =
=A0 =A0 value</div>


<div>--------------------</div><div>1 =A0 annie</div><div>2 =A0 Jason</div>=
<div>1 =A0 andy</div><div>2 =A0 Joey</div><div>1 =A0 andrew</div><div>...</=
div><div><br></div><div>and I would like write all the=A0intermediate outpu=
ts with key 1 to file &quot;ID_1.dat&quot;, and all the intermediate output=
s with key 2 to file &quot;ID_2.data&quot;.</div>


<div><br></div><div>how could I achieve that?</div><div><div><br></div>-- <=
br><div>YANG, Lin</div><br>
</div>

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