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FindUrls.java
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Sat, Oct 5, 19:31

FindUrls.java
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package org.warcbase.analysis;
import java.io.IOException;
import java.util.Arrays;
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.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
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.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.input.FileSplit;
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 FindUrls extends Configured implements Tool {
private static final Logger LOG = Logger.getLogger(FindUrls.class);
private static enum Records { TOTAL };
private static class MyMapper extends Mapper<LongWritable, ArcRecordBase, Text, Text> {
private static final Text KEY = new Text();
private static final Text VALUE = new Text();
private String pattern = null;
@Override
public void setup(Context context) {
Configuration conf = context.getConfiguration();
pattern = conf.get(PATTERN_OPTION);
}
@Override
public void map(LongWritable key, ArcRecordBase record, Context context)
throws IOException, InterruptedException {
context.getCounter(Records.TOTAL).increment(1);
String url = record.getUrlStr();
String date = record.getArchiveDateStr();
String type = record.getContentTypeStr();
if (url.matches(pattern)) {
String fileName = ((FileSplit) context.getInputSplit()).getPath().getName();
KEY.set(fileName + " " + url + " " + type);
VALUE.set(date);
context.write(KEY, VALUE);
}
}
}
public FindUrls() {}
public static final String INPUT_OPTION = "input";
public static final String OUTPUT_OPTION = "output";
public static final String PATTERN_OPTION = "pattern";
/**
* 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));
options.addOption(OptionBuilder.withArgName("regexp").hasArg()
.withDescription("URL pattern").create(PATTERN_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));
String pattern = cmdline.getOptionValue(PATTERN_OPTION);
LOG.info("Tool name: " + FindUrls.class.getSimpleName());
LOG.info(" - input: " + input);
LOG.info(" - output: " + output);
Job job = Job.getInstance(getConf(), FindUrls.class.getSimpleName() + ":" + input);
job.setJarByClass(FindUrls.class);
job.setNumReduceTasks(1);
job.setMapOutputKeyClass(Text.class);
job.setMapOutputValueClass(Text.class);
FileInputFormat.addInputPaths(job, input);
FileOutputFormat.setOutputPath(job, output);
job.setInputFormatClass(JwatArcInputFormat.class);
job.setOutputFormatClass(TextOutputFormat.class);
job.setMapperClass(MyMapper.class);
job.getConfiguration().set(PATTERN_OPTION, pattern);
FileSystem fs = FileSystem.get(getConf());
if ( FileSystem.get(getConf()).exists(output)) {
fs.delete(output, true);
}
job.waitForCompletion(true);
Counters counters = job.getCounters();
int numDocs = (int) counters.findCounter(Records.TOTAL).getValue();
LOG.info("Read " + numDocs + " records.");
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 " + FindUrls.class.getCanonicalName() + " with args "
+ Arrays.toString(args));
ToolRunner.run(new FindUrls(), args);
}
}

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