/* Set main, map and reduce classes */
job.setJarByClass(Driver.class);
job.setMapperClass(Map.class);
job.setReducerClass(Reduce.class);

Scan scan = new Scan();
scan.setCaching(500);
scan.setCacheBlocks(false);

/* Initialize the initTableMapperJob */
TableMapReduceUtil.initTableMapperJob(
        "dnsr",
        scan,
        Map.class,
        Text.class,
        Text.class,
        job);

/* Set output parameters */
job.setOutputKeyClass(Text.class);
job.setOutputValueClass(Text.class);
job.setOutputFormatClass(TextOutputFormat.class);

@Override
    public void map(ImmutableBytesWritable row, Result value, Context context)
            throws InterruptedException, IOException {
        byte[] columnValue = value.getValue("d".getBytes(), "fqdn".getBytes());
        if (columnValue == null)
            return;

        byte[] firstSeen = value.getValue("d".getBytes(), "fs".getBytes());
        // if (firstSeen == null)
        //     return;

        String fqdn = new String(columnValue).toLowerCase();
        String fs = (firstSeen == null) ? "empty" : new String(firstSeen);

        context.write(new Text(fqdn), new Text(fs));
    }

@Override
public void map(ImmutableBytesWritable row, Result value, Context context)
        throws InterruptedException, IOException {
    byte[] columnValue = value.getValue(columnFamily, fqdnColumnName);
    if (columnValue == null)
        return;
    String fqdn = new String(columnValue).toLowerCase();

    /* Getting all the columns */
    String[] cns = getColumnsInColumnFamily(value, "d");
    StringBuilder sb = new StringBuilder();
    for (String s : cns) {
        sb.append(s).append(";");
    }

    context.write(new Text(fqdn), new Text(sb.toString()));
}