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ExtractUniqueUrls.java
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Mon, Sep 23, 13:33

ExtractUniqueUrls.java
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package org.warcbase.analysis;
import java.io.IOException;
import java.util.Arrays;
import java.util.Iterator;
import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.CommandLineParser;
import org.apache.commons.cli.GnuParser;
import org.apache.commons.cli.HelpFormatter;
import org.apache.commons.cli.OptionBuilder;
import org.apache.commons.cli.Options;
import org.apache.commons.cli.ParseException;
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.mapreduce.Counters;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.mapreduce.lib.output.TextOutputFormat;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
import org.apache.log4j.Logger;
import org.jwat.arc.ArcRecordBase;
import org.warcbase.mapreduce.JwatArcInputFormat;
public class ExtractUniqueUrls extends Configured implements Tool {
private static final Logger LOG = Logger.getLogger(ExtractUniqueUrls.class);
private static enum Records { TOTAL, UNIQUE };
private static class MyMapper
extends Mapper<LongWritable, ArcRecordBase, Text, IntWritable> {
private final IntWritable value = new IntWritable(1);
private final Text url = new Text();
@Override
public void map(LongWritable key, ArcRecordBase record, Context context)
throws IOException, InterruptedException {
context.getCounter(Records.TOTAL).increment(1);
if (record.getUrlStr().startsWith("http://")) {
url.set(record.getUrlStr());
context.write(url, value);
}
}
}
private static class MyReducer extends Reducer<Text, IntWritable, Text, IntWritable> {
private final IntWritable value = new IntWritable();
@Override
public void reduce(Text key, Iterable<IntWritable> values, Context context)
throws IOException, InterruptedException {
Iterator<IntWritable> iter = values.iterator();
int sum = 0;
while (iter.hasNext()) {
sum += iter.next().get();
}
value.set(sum);
context.write(key, value);
context.getCounter(Records.UNIQUE).increment(1);
}
}
public ExtractUniqueUrls() {}
public static final String INPUT_OPTION = "input";
public static final String OUTPUT_OPTION = "output";
/**
* Runs this tool.
*/
@SuppressWarnings("static-access")
public int run(String[] args) throws Exception {
Options options = new Options();
options.addOption(OptionBuilder.withArgName("path").hasArg()
.withDescription("input path").create(INPUT_OPTION));
options.addOption(OptionBuilder.withArgName("path").hasArg()
.withDescription("output path").create(OUTPUT_OPTION));
CommandLine cmdline;
CommandLineParser parser = new GnuParser();
try {
cmdline = parser.parse(options, args);
} catch (ParseException exp) {
HelpFormatter formatter = new HelpFormatter();
formatter.printHelp(this.getClass().getName(), options);
ToolRunner.printGenericCommandUsage(System.out);
System.err.println("Error parsing command line: " + exp.getMessage());
return -1;
}
if (!cmdline.hasOption(INPUT_OPTION) || !cmdline.hasOption(OUTPUT_OPTION)) {
HelpFormatter formatter = new HelpFormatter();
formatter.printHelp(this.getClass().getName(), options);
ToolRunner.printGenericCommandUsage(System.out);
return -1;
}
String input = cmdline.getOptionValue(INPUT_OPTION);
Path output = new Path(cmdline.getOptionValue(OUTPUT_OPTION));
LOG.info("Tool name: " + ExtractUniqueUrls.class.getSimpleName());
LOG.info(" - input: " + input);
LOG.info(" - output: " + output);
Job job = Job.getInstance(getConf(), ExtractUniqueUrls.class.getSimpleName() + ":" + input);
job.setJarByClass(ExtractUniqueUrls.class);
job.setNumReduceTasks(1);
FileInputFormat.addInputPaths(job, input);
FileOutputFormat.setOutputPath(job, output);
job.setInputFormatClass(JwatArcInputFormat.class);
job.setOutputFormatClass(TextOutputFormat.class);
job.setMapperClass(MyMapper.class);
job.setReducerClass(MyReducer.class);
job.setMapOutputKeyClass(Text.class);
job.setMapOutputValueClass(IntWritable.class);
FileSystem fs = FileSystem.get(getConf());
if ( FileSystem.get(getConf()).exists(output)) {
fs.delete(output, true);
}
long startTime = System.currentTimeMillis();
job.waitForCompletion(true);
LOG.info("Job Finished in " + (System.currentTimeMillis() - startTime) / 1000.0 + " seconds");
Counters counters = job.getCounters();
LOG.info("Read " + counters.findCounter(Records.TOTAL).getValue() + " total URLs.");
LOG.info("Read " + counters.findCounter(Records.UNIQUE).getValue() + " unique URLs.");
return 0;
}
/**
* Dispatches command-line arguments to the tool via the <code>ToolRunner</code>.
*/
public static void main(String[] args) throws Exception {
LOG.info("Running " + ExtractUniqueUrls.class.getCanonicalName() + " with args "
+ Arrays.toString(args));
ToolRunner.run(new ExtractUniqueUrls(), args);
}
}

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