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From: Pat Ferrel <pat.ferrel@gmail.com>
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Subject: Hadoop 101
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Date: Tue, 11 Dec 2012 16:49:45 -0800
To: "user@hadoop.apache.org" <user@hadoop.apache.org>
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Stupid question for the day=85

I have a file created by a mahout job of the form:

0	=
[356:0.3481597,359:0.3481597,358:0.3481597,361:0.3481597,360:0.3481597]
8	=
[356:0.34786037,359:0.34786037,358:0.34786037,361:0.34786037,360:0.3478603=
7]
25	=
[284:0.34821576,286:0.34821576,287:0.34821576,288:0.34821576,289:0.3482157=
6]
28	=
[452:0.34802154,454:0.34802154,453:0.34802154,456:0.34802154,455:0.3480215=
4]
=85

If this were a SequenceFile I could read it and be merrily on my way but =
it's a text file. The classes written are key, value pairs =
<LongWritable, VectorWritable> but the file is tab delimited text.=20

I was hoping to do something like:

SequenceFile.Reader reader =3D new SequenceFile.Reader(fs, inputFile, =
conf);
Writable userId =3D new LongWritable();
VectorWritable recommendations =3D new VectorWritable();
while (reader.next(userId, recommendations)) {
	//do something with each pair
}

But alas Google fails me. How do you read in key, values pairs from text =
files outside of a map or reduce?=20