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UriMappingMapReduceBuilder.java
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Wed, Oct 2, 07:41

UriMappingMapReduceBuilder.java
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package org.warcbase.data;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
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.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.NullWritable;
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.Mapper.Context;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.mapreduce.lib.output.NullOutputFormat;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
import org.apache.log4j.Logger;
import org.apache.lucene.store.OutputStreamDataOutput;
import org.apache.lucene.util.BytesRef;
import org.apache.lucene.util.IOUtils;
import org.apache.lucene.util.IntsRef;
import org.apache.lucene.util.fst.Builder;
import org.apache.lucene.util.fst.FST;
import org.apache.lucene.util.fst.PositiveIntOutputs;
import org.apache.lucene.util.fst.Util;
import org.apache.lucene.util.fst.FST.INPUT_TYPE;
import org.jwat.arc.ArcRecordBase;
import org.warcbase.mapreduce.ArcInputFormat;
import com.sun.tools.javac.util.Log;
public class UriMappingMapReduceBuilder extends Configured implements Tool {
private static final Logger LOG = Logger.getLogger(UriMappingMapReduceBuilder.class);
private static enum Records {
TOTAL, RECORD_COUNT
};
public static class UriMappingBuilderMapper extends
Mapper<LongWritable, ArcRecordBase, Text, Text> {
public static final Text KEY = new Text();
public static final Text VALUE = new Text();
public void map(LongWritable key, ArcRecordBase record, Context context) throws IOException,
InterruptedException {
context.getCounter(Records.TOTAL).increment(1);
String url = record.getUrlStr();
String type = record.getContentTypeStr();
if (!type.equals("text/html")) {
return;
}
KEY.set(url);
context.write(KEY, VALUE);
}
}
public static class UriMappingBuilderReducer extends
Reducer<Text, Text, NullWritable, NullWritable> {
public static List<String> urls = new ArrayList<String>();
private static String path;
// read PATH environment
@Override
public void setup(Context context) {
Configuration conf = context.getConfiguration();
path = conf.get("PATH");
}
@Override
public void reduce(Text key, Iterable<Text> values, Context context) throws IOException,
InterruptedException {
context.getCounter(Records.RECORD_COUNT).increment(1);
urls.add(key.toString());
}
@Override
public void cleanup(Context context) throws IOException {
long size = urls.size();
List outputValues = new ArrayList<Long>(); // create the mapping id
for (long i = 1; i <= size; i++) {
outputValues.add(i);
}
PositiveIntOutputs outputs = PositiveIntOutputs.getSingleton();
Builder<Long> builder = new Builder<Long>(INPUT_TYPE.BYTE1, outputs);
BytesRef scratchBytes = new BytesRef();
IntsRef scratchInts = new IntsRef();
for (int i = 0; i < size; i++) {
scratchBytes.copyChars((String) urls.get(i));
try {
// Mapping!
builder.add(Util.toIntsRef(scratchBytes, scratchInts), (Long) outputValues.get(i));
} catch (UnsupportedOperationException e) {
LOG.info("Duplicate Url:" + urls.get(i));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
FST<Long> fst = builder.finish();
LOG.info("PATH: " + path);
// Delete the output directory if it exists already.
Path outputDir = new Path(path);
FileSystem.get(context.getConfiguration()).delete(outputDir, true);
// Save FST to file
FileSystem fs = FileSystem.get(context.getConfiguration());
Path fstPath = new Path(path);
OutputStream fStream = fs.create(fstPath);
OutputStreamDataOutput fstStream = new OutputStreamDataOutput(fStream);
boolean success = false;
try {
fst.save(fstStream);
success = true;
} finally {
if (success) {
IOUtils.close(fstStream);
} else {
IOUtils.closeWhileHandlingException(fstStream);
}
}
}
}
public UriMappingMapReduceBuilder() {
}
private static final String INPUT = "input";
private static final String OUTPUT = "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));
options.addOption(OptionBuilder.withArgName("path").hasArg().withDescription("output path")
.create(OUTPUT));
CommandLine cmdline;
CommandLineParser parser = new GnuParser();
try {
cmdline = parser.parse(options, args);
} catch (ParseException exp) {
System.err.println("Error parsing command line: " + exp.getMessage());
return -1;
}
if (!cmdline.hasOption(INPUT) || !cmdline.hasOption(OUTPUT)) {
System.out.println("args: " + Arrays.toString(args));
HelpFormatter formatter = new HelpFormatter();
formatter.setWidth(120);
formatter.printHelp(this.getClass().getName(), options);
ToolRunner.printGenericCommandUsage(System.out);
return -1;
}
String inputPath = cmdline.getOptionValue(INPUT);
String outputPath = cmdline.getOptionValue(OUTPUT);
LOG.info("- input path: " + inputPath);
LOG.info("- output path: " + outputPath);
Configuration conf = getConf();
conf.set("PATH", outputPath);
conf.set("mapreduce.reduce.java.opts", "-Xmx4096m");
Job job = Job.getInstance(conf, UriMappingMapReduceBuilder.class.getSimpleName());
job.setJarByClass(UriMappingMapReduceBuilder.class);
job.getConfiguration().set("UriMappingBuilderClass",
UriMappingMapReduceBuilder.class.getCanonicalName());
FileInputFormat.setInputPaths(job, new Path(inputPath));
job.setInputFormatClass(ArcInputFormat.class);
job.setOutputFormatClass(NullOutputFormat.class); // no automatic output
// set map (key,value) output format
job.setMapOutputKeyClass(Text.class);
job.setMapOutputValueClass(Text.class);
job.setMapperClass(UriMappingBuilderMapper.class);
job.setReducerClass(UriMappingBuilderReducer.class);
// all the keys are shuffled to a single reducer
job.setNumReduceTasks(1);
long startTime = System.currentTimeMillis();
job.waitForCompletion(true);
LOG.info("Job Finished in " + (System.currentTimeMillis() - startTime) / 1000.0 + " seconds");
Counters counters = job.getCounters();
int numRecords = (int) counters.findCounter(Records.TOTAL).getValue();
int numUrls = (int) counters.findCounter(Records.RECORD_COUNT).getValue();
LOG.info("Read " + numRecords + " records.");
LOG.info("Generate " + numUrls + " unique urls.");
return 0;
}
public static void main(String[] args) throws Exception {
// TODO Auto-generated method stub
ToolRunner.run(new UriMappingMapReduceBuilder(), args);
}
}

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