MapReduce for Loading TSV - mapreduce

Question

I am trying to load data into Cloud Bigtable using mapreduce job such that the values of the first column are set to hbase row key.Here is my code and a sample TSV file.
1011 v1 v2 v3 v4
1012 c1 c2 c3 c4
1013 k1 k2 k3 k4
1014 s1 s2 s3 s4
1015 r1 r3 r2 r4
1016 p1 p2 p7 p9
Here is my code sample :-
public static class TokenizerMapper extends
Mapper<Text, Text, Text,Text> {
#Override
public void map(Text key, Text value, Context context) throws IOException,
InterruptedException {
String fields[] = null;
CSVParser csvParser = new CSVParser('\t');
fields = csvParser.parseLine(value.toString());
LOG.info(fields[0]);
context.write(new Text(fields[0]), value);
}
}
public static class MyTableReducer extends
TableReducer<Text, Text, Text> {
#Override
public void reduce(Text key, Iterable<Text> values, Context context)
throws IOException, InterruptedException {
String[] fields = null;
CSVParser csvParser = new CSVParser('\t');
try {
for(Text value: values) {
fields = csvParser.parseLine(value.toString());
for (int i = 1; i < fields.length; ++i) {
Put put = new Put(Bytes.toBytes(fields[0]));
put.addColumn(COLUMN_FAMILY, Bytes.toBytes(cols[i]), Bytes.toBytes(fields[i]));
context.write(key, put);
}
}
} catch (Exception ex) {
context.getCounter("HBaseKVMapper", "PARSE_ERRORS").increment(1);
return;
}
}
}
public static void main(String[] args) throws Exception {
Configuration conf = HBaseConfiguration.create();
conf.set("mapreduce.input.keyvaluelinerecordreader.key.value.separator", "\t");
Job job = Job.getInstance(conf, "BigTableLoader");
job.setInputFormatClass(KeyValueTextInputFormat.class);
KeyValueTextInputFormat.addInputPath(job,new Path(args[0]));
TableName tableName = TableName.valueOf(args[1]);
job.setJarByClass(BigtableLoader.class);
job.setMapperClass(TokenizerMapper.class);
job.setMapOutputValueClass(Text.class);
job.setMapOutputKeyClass(Text.class);
TableMapReduceUtil.initTableReducerJob(tableName.getNameAsString(), MyTableReducer.class, job);
System.exit(job.waitForCompletion(true) ? 0 : 1);
}
}
The problem I am getting is that instead of the first column, the second column has been set as the key in the table, and also the first column is ignored completely i.e. it doesn't exist in the table.
Is there that something I am missing??