With old-api (mapred.*), there are no setup() and cleanup(). But you can use
configure() and close(). Here is a sample code:
public static class MapClass extends MapReduceBase
implements Mapper<LongWritable, Text, Text, IntWritable> {
private final static IntWritable one = new IntWritable(1);
private Text word = new Text();
@Override
public void configure(JobConf job) {
}
@Override
public void map(LongWritable key, Text value,
OutputCollector<Text, IntWritable> output,
Reporter reporter) throws IOException {
String line = value.toString();
StringTokenizer itr = new StringTokenizer(line);
while (itr.hasMoreTokens()) {
word.set(itr.nextToken());
output.collect(word, one);
}
}
@Override
public void close() throws IOException {
}
}
Liyin Liang
发件人: unmesha sreeveni [mailto:[email protected]]
发送时间: 2013年12月19日 11:25
收件人: User Hadoop
主题: setup() and cleanup() methods for mapred api.
Is there setup() and cleanup() methods for mapred api.
Is there a sample code for reference
--
Thanks & Regards
Unmesha Sreeveni U.B
Junior Developer
