public void reduce(
BytesWritable key,
Iterator<IntWritable> values,
OutputCollector<BytesWritable, IntWritable> output,
Reporter reporter)
throws IOException {
int ones = 0;
int twos = 0;
while (values.hasNext()) {
IntWritable count = values.next();
if (count.equals(sortInput)) {
++ones;
} else if (count.equals(sortOutput)) {
++twos;
} else {
throw new IOException(
"Invalid 'value' of " + count.get() + " for (key,value): " + key.toString());
}
}
// Check to ensure there are equal no. of ones and twos
if (ones != twos) {
throw new IOException(
"Illegal ('one', 'two'): ("
+ ones
+ ", "
+ twos
+ ") for (key, value): "
+ key.toString());
}
}
@Override
public String toString() {
return "<key: " + key.toString() + ", partition: " + partition.toString() + ">";
}