Hi people,
Please, I don't know what is happening with values I'm putting into a
MapWritable.
I think I have to call write method (or readFields?) but I don't know how.
Is it that I need to do to get values through 'LOG.info("freq: " +
docIDfreq.get(docIDfreqItr.next()));', for example?
Why does it work with key? Look: 'LOG.info("key: " +
(docIDfreqItr.next()));'
Look the code:
private static final Log LOG = LogFactory.getLog(WordCount.class
.getName());
public static class MapClass extends MapReduceBase
implements Mapper<LongWritable, Text, Text, MapWritable> {
public void map(LongWritable key, Text value,
OutputCollector<Text, MapWritable> output,
Reporter reporter) throws IOException {
String line = value.toString();
StringTokenizer itr = new StringTokenizer(line);
HashMap<String,Integer> map = new HashMap<String,Integer>();
Integer valor = 0;
while (itr.hasMoreTokens()) {
try {
valor = map.get(itr.nextToken());
if (valor == null) {
map.put(itr.nextToken(), 1);
}
else {
map.put(itr.nextToken(), valor + 1);
}
} catch (NoSuchElementException e) {
e.printStackTrace();
}
}
Iterator<String> mapItr = map.keySet().iterator();
MapWritable docIDfreq = new MapWritable();
while (mapItr.hasNext()){
String term = mapItr.next();
Integer freq = map.get(term);
LOG.info("freq = " + freq);
docIDfreq.put(key, new LongWritable(freq.longValue()));
LOG.info("emitindo... " + "<" + term + "(" + key + "," + freq + ")>");
output.collect(new Text(term), docIDfreq);
}
Iterator<Writable> docIDfreqItr = docIDfreq.keySet().iterator();
while (docIDfreqItr.hasNext()){
LOG.info("key: " + (docIDfreqItr.next()));
LOG.info("freq: " + docIDfreq.get(docIDfreqItr.next()));
}
}
}
Thanks in advance!
Regards,
Luiz
