/**
* Expert users can override this method for more complete control over the execution of the
* Mapper.
*
* @param context
* @throws IOException
*/
public void run(Context context) throws IOException, InterruptedException {
setup(context);
while (context.nextKeyValue()) {
map(context.getCurrentKey(), context.getCurrentValue(), context);
}
cleanup(context);
}
@Override
protected void map(Text key, PageInvertWritable value, Context context)
throws IOException, InterruptedException {
if (key.getBytes()[0] == 'W') {
super.map(new Text(new String(key.toString()).substring(1)), value, context);
}
}
@Override
protected void map(
final LongWritable key,
final DoubleWritable value,
final org.apache.hadoop.mapreduce.Mapper.Context context)
throws IOException, InterruptedException {
long positiveKey = key.get();
double adjustedValue = value.get();
if (positiveKey < 0) {
positiveKey = -positiveKey - 1;
adjustedValue *= -1;
}
super.map(new LongWritable(positiveKey), new DoubleWritable(adjustedValue), context);
}