/*
* Cloud9: A MapReduce Library for Hadoop
*
* Licensed under the Apache License, Version 2.0 (the "License"); you
* may not use this file except in compliance with the License. You may
* obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
package edu.umd.cloud9.collection.spinn3r;
import java.io.IOException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.FileInputFormat;
import org.apache.hadoop.mapred.FileOutputFormat;
import org.apache.hadoop.mapred.JobClient;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.MapReduceBase;
import org.apache.hadoop.mapred.Mapper;
import org.apache.hadoop.mapred.OutputCollector;
import org.apache.hadoop.mapred.Reporter;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
import org.apache.log4j.Logger;
public class DemoCountSpinn3rEnglishPosts extends Configured implements Tool {
private static final Logger sLogger = Logger.getLogger(DemoCountSpinn3rEnglishPosts.class);
private static enum Languages {
TOTAL, EN
};
private static class MyMapper extends MapReduceBase implements
Mapper<LongWritable, Spinn3rItem, LongWritable, Text> {
public void map(LongWritable key, Spinn3rItem item,
OutputCollector<LongWritable, Text> output, Reporter reporter) throws IOException {
if (item.getLanguage().equals("en")) {
reporter.incrCounter(Languages.EN, 1);
}
reporter.incrCounter(Languages.TOTAL, 1);
}
}
/**
* Creates an instance of this tool.
*/
public DemoCountSpinn3rEnglishPosts() {
}
private static int printUsage() {
System.out.println("usage: [input] [output-dir]");
ToolRunner.printGenericCommandUsage(System.out);
return -1;
}
/**
* Runs this tool.
*/
public int run(String[] args) throws Exception {
if (args.length != 2) {
printUsage();
return -1;
}
String inputPath = args[0];
String outputPath = args[1];
sLogger.info("input dir: " + inputPath);
sLogger.info("output dir: " + outputPath);
JobConf conf = new JobConf(DemoCountSpinn3rEnglishPosts.class);
conf.setJobName("DemoCountSpinn3rEnglishPosts");
conf.setNumReduceTasks(0);
FileInputFormat.setInputPaths(conf, new Path(inputPath));
FileOutputFormat.setOutputPath(conf, new Path(outputPath));
FileOutputFormat.setCompressOutput(conf, false);
conf.setInputFormat(Spinn3rItemInputFormat.class);
conf.setOutputKeyClass(Text.class);
conf.setOutputValueClass(IntWritable.class);
conf.setMapperClass(MyMapper.class);
// delete the output directory if it exists already
FileSystem.get(conf).delete(new Path(outputPath), true);
JobClient.runJob(conf);
// clean up
FileSystem.get(conf).delete(new Path(outputPath), true);
return 0;
}
/**
* Dispatches command-line arguments to the tool via the
* <code>ToolRunner</code>.
*/
public static void main(String[] args) throws Exception {
int res = ToolRunner.run(new Configuration(), new DemoCountSpinn3rEnglishPosts(), args);
System.exit(res);
}
}