public void reduce(Text key, Iterable<IntWritable> values, Context context)
throws IOException, InterruptedException {
int sum = 0;
for (IntWritable val : values) {
sum++;
}
context.write(new IntWritable(sum), NullWritable.get());
}
@SuppressWarnings("unchecked")
private void writeOutput(RecordWriter theRecordWriter, Reporter reporter) throws IOException {
NullWritable nullWritable = NullWritable.get();
try {
theRecordWriter.write(key1, val1);
theRecordWriter.write(null, nullWritable);
theRecordWriter.write(null, val1);
theRecordWriter.write(nullWritable, val2);
theRecordWriter.write(key2, nullWritable);
theRecordWriter.write(key1, null);
theRecordWriter.write(null, null);
theRecordWriter.write(key2, val2);
} finally {
theRecordWriter.close(reporter);
}
}