/*
* 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.line;
import java.io.IOException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.mapred.FileInputFormat;
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.mapred.lib.NullOutputFormat;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
import org.apache.log4j.Logger;
public class DemoCountTextDocuments extends Configured implements Tool {
private static final Logger sLogger = Logger.getLogger(DemoCountTextDocuments.class);
private static enum Count {
DOCS
};
private static class MyMapper extends MapReduceBase implements
Mapper<LongWritable, TextDocument, NullWritable, NullWritable> {
public void configure(JobConf job) {
}
public void map(LongWritable key, TextDocument doc,
OutputCollector<NullWritable, NullWritable> output, Reporter reporter)
throws IOException {
reporter.incrCounter(Count.DOCS, 1);
}
}
/**
* Creates an instance of this tool.
*/
public DemoCountTextDocuments() {
}
private static int printUsage() {
System.out.println("usage: [input]");
ToolRunner.printGenericCommandUsage(System.out);
return -1;
}
/**
* Runs this tool.
*/
public int run(String[] args) throws Exception {
if (args.length != 1) {
printUsage();
return -1;
}
String inputPath = args[0];
sLogger.info("input: " + inputPath);
JobConf conf = new JobConf(DemoCountTextDocuments.class);
conf.setJobName("DemoCountTextDocuments");
conf.setNumReduceTasks(0);
FileInputFormat.setInputPaths(conf, new Path(inputPath));
conf.setInputFormat(TextDocumentInputFormat.class);
conf.setOutputFormat(NullOutputFormat.class);
conf.setMapperClass(MyMapper.class);
JobClient.runJob(conf);
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 DemoCountTextDocuments(), args);
System.exit(res);
}
}