public void map(BytesWritable key, BytesWritable value, Context context)
throws IOException, InterruptedException {
long start = NumberUtils.decodeLong(key.getBytes(), 0);
long end = NumberUtils.decodeLong(key.getBytes(), 8);
oKey.set(start);
oValue.setSize(value.getLength() + 9);
oValue.getBytes()[0] = 0;
NumberUtils.encodeLong(oValue.getBytes(), 1, end);
System.arraycopy(value.getBytes(), 0, oValue.getBytes(), 9, value.getLength());
context.write(oKey, oValue);
oKey.set(end);
oValue.getBytes()[0] = 1;
NumberUtils.encodeLong(oValue.getBytes(), 1, start);
System.arraycopy(value.getBytes(), 0, oValue.getBytes(), 9, value.getLength());
context.write(oKey, oValue);
}
@Override
public int getPartition(BytesWritable key, NullWritable value, int numPartitions) {
// The task number is on the first three bytes, not 4.
long resource = NumberUtils.decodeLong(key.getBytes(), 0);
int number = (int) (resource >> 40);
/*
* int partition = Math.round((number / partitionSize)); if (partition
* >= numPartitions) { log.error("Resource = " + resource + " number = "
* + number + " partition = " + partition); partition = numPartitions -
* 1; }
*/
return number % numPartitions;
}