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NUTCH-1221 Migrate DomainStatistics to MapReduce API
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git-svn-id: https://svn.apache.org/repos/asf/nutch/trunk@1215090 13f79535-47bb-0310-9956-ffa450edef68
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Markus Jelsma committed Dec 16, 2011
1 parent 54812bd commit e367ff2
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2 changes: 2 additions & 0 deletions CHANGES.txt
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@@ -1,5 +1,7 @@
Nutch Change Log

* NUTCH-1221 Migrate DomainStatistics to MapReduce API (markus)

* NUTCH-1216 Add trivial comment to lib/native/README.txt (lewismc)

* NUTCH-1214 DomainStats tool should be named for what it's doing (markus)
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208 changes: 96 additions & 112 deletions src/java/org/apache/nutch/util/domain/DomainStatistics.java
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Expand Up @@ -25,60 +25,51 @@
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
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.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.Reducer;
import org.apache.hadoop.mapred.Reporter;
import org.apache.hadoop.mapred.SequenceFileInputFormat;
import org.apache.hadoop.mapred.TextOutputFormat;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.input.SequenceFileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.mapreduce.lib.output.TextOutputFormat;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
import org.apache.nutch.crawl.CrawlDatum;
import org.apache.nutch.util.NutchConfiguration;
import org.apache.nutch.util.NutchJob;
import org.apache.nutch.util.TimingUtil;
import org.apache.nutch.util.URLUtil;

/**
* Extracts some very basic statistics about domains from the crawldb
* Extracts some very basic statistics about domains from the crawldb
*/
public class DomainStatistics
extends MapReduceBase
implements Tool, Mapper<Text, CrawlDatum, Text, LongWritable>,
Reducer<Text, LongWritable, LongWritable, Text> {
public class DomainStatistics extends Configured implements Tool {

private static final Logger LOG = LoggerFactory.getLogger(DomainStatistics.class);

private static final Text FETCHED_TEXT = new Text("FETCHED");
private static final Text NOT_FETCHED_TEXT = new Text("NOT_FETCHED");

public static enum MyCounter {FETCHED, NOT_FETCHED, EMPTY_RESULT};

private static final int MODE_HOST = 1;
private static final int MODE_DOMAIN = 2;
private static final int MODE_SUFFIX = 3;

private int mode = 0;

private Configuration conf;

public int run(String[] args) throws IOException {

public int run(String[] args) throws Exception {
if (args.length < 3) {
System.out.println("usage: DomainStatistics inputDirs outDir host|domain|suffix [numOfReducer]");
return 1;
}
String inputDir = args[0];
String outputDir = args[1];
int numOfReducers = 1;

if (args.length > 3) {
numOfReducers = Integer.parseInt(args[3]);
}
Expand All @@ -87,132 +78,125 @@ public int run(String[] args) throws IOException {
long start = System.currentTimeMillis();
LOG.info("DomainStatistics: starting at " + sdf.format(start));

JobConf job = new NutchJob(getConf());

int mode = 0;
String jobName = "DomainStatistics";
if(args[2].equals("host")) {
job.setJobName("Host statistics");
jobName = "Host statistics";
mode = MODE_HOST;
} else if(args[2].equals("domain")) {
job.setJobName("Domain statistics");
jobName = "Domain statistics";
mode = MODE_DOMAIN;
} else if(args[2].equals("suffix")) {
job.setJobName("Suffix statistics");
jobName = "Suffix statistics";
mode = MODE_SUFFIX;
}

job.setInt("domain.statistics.mode", mode);
Configuration conf = getConf();
conf.setInt("domain.statistics.mode", mode);
conf.setBoolean("mapreduce.fileoutputcommitter.marksuccessfuljobs", false);

Job job = new Job(conf, jobName);
job.setJarByClass(DomainStatistics.class);

String[] inputDirsSpecs = inputDir.split(",");
for (int i = 0; i < inputDirsSpecs.length; i++) {
FileInputFormat.addInputPath(job, new Path(inputDirsSpecs[i]));
}

job.setInputFormat(SequenceFileInputFormat.class);
job.setMapperClass(DomainStatistics.class);
job.setInputFormatClass(SequenceFileInputFormat.class);
FileOutputFormat.setOutputPath(job, new Path(outputDir));
job.setOutputFormat(TextOutputFormat.class);
job.setOutputFormatClass(TextOutputFormat.class);

job.setMapOutputKeyClass(Text.class);
job.setMapOutputValueClass(LongWritable.class);
job.setOutputKeyClass(Text.class);
job.setOutputValueClass(LongWritable.class);
job.setReducerClass(DomainStatistics.class);

job.setMapperClass(DomainStatisticsMapper.class);
job.setReducerClass(DomainStatisticsReducer.class);
job.setCombinerClass(DomainStatisticsCombiner.class);
job.setNumReduceTasks(numOfReducers);

JobClient.runJob(job);


try {
job.waitForCompletion(true);
} catch (Exception e) {
throw e;
}

long end = System.currentTimeMillis();
LOG.info("DomainStatistics: finished at " + sdf.format(end) + ", elapsed: " + TimingUtil.elapsedTime(start, end));
return 0;
}

@Override
public void configure(JobConf job) {
super.configure(job);
mode = job.getInt("domain.statistics.mode", MODE_DOMAIN);
}


public Configuration getConf() {
return conf;
}

public void setConf(Configuration conf) {
this.conf = conf;
}
static class DomainStatisticsMapper extends Mapper<Text, CrawlDatum, Text, LongWritable> {
int mode = 0;

public void map(Text urlText, CrawlDatum datum,
OutputCollector<Text, LongWritable> output, Reporter reporter)
throws IOException {

if(datum.getStatus() == CrawlDatum.STATUS_DB_FETCHED
|| datum.getStatus() == CrawlDatum.STATUS_DB_NOTMODIFIED) {

try {
URL url = new URL(urlText.toString());
String out = null;
switch (mode) {
case MODE_HOST:
out = url.getHost();
break;
case MODE_DOMAIN:
out = URLUtil.getDomainName(url);
break;
case MODE_SUFFIX:
out = URLUtil.getDomainSuffix(url).getDomain();
break;
}
if(out.trim().equals("")) {
LOG.info("url : " + url);
reporter.incrCounter(MyCounter.EMPTY_RESULT, 1);
}

output.collect(new Text(out), new LongWritable(1));
} catch (Exception ex) { }
reporter.incrCounter(MyCounter.FETCHED, 1);
output.collect(FETCHED_TEXT, new LongWritable(1));
public void setup(Context context) {
mode = context.getConfiguration().getInt("domain.statistics.mode", MODE_DOMAIN);
}
else {
reporter.incrCounter(MyCounter.NOT_FETCHED, 1);
output.collect(NOT_FETCHED_TEXT, new LongWritable(1));

public void map(Text urlText, CrawlDatum datum, Context context) throws IOException, InterruptedException {

if(datum.getStatus() == CrawlDatum.STATUS_DB_FETCHED
|| datum.getStatus() == CrawlDatum.STATUS_DB_NOTMODIFIED) {

try {
URL url = new URL(urlText.toString());
String out = null;
switch (mode) {
case MODE_HOST:
out = url.getHost();
break;
case MODE_DOMAIN:
out = URLUtil.getDomainName(url);
break;
case MODE_SUFFIX:
out = URLUtil.getDomainSuffix(url).getDomain();
break;
}
if(out.trim().equals("")) {
LOG.info("url : " + url);
context.getCounter(MyCounter.EMPTY_RESULT).increment(1);
}

context.write(new Text(out), new LongWritable(1));
} catch (Exception ex) { }

context.getCounter(MyCounter.FETCHED).increment(1);
context.write(FETCHED_TEXT, new LongWritable(1));
}
else {
context.getCounter(MyCounter.NOT_FETCHED).increment(1);
context.write(NOT_FETCHED_TEXT, new LongWritable(1));
}
}
}

public void reduce(Text key, Iterator<LongWritable> values,
OutputCollector<LongWritable, Text> output, Reporter reporter)
throws IOException {
long total = 0;

while(values.hasNext()) {
LongWritable val = values.next();
total += val.get();
static class DomainStatisticsReducer extends Reducer <Text, LongWritable, LongWritable, Text> {
public void reduce(Text key, Iterable<LongWritable> values, Context context) throws IOException, InterruptedException {
long total = 0;

for (LongWritable val : values) {
total += val.get();
}

context.write(new LongWritable(total), key);
}
//invert output
output.collect(new LongWritable(total), key);
}


public static class DomainStatisticsCombiner extends MapReduceBase
implements Reducer<Text, LongWritable, Text, LongWritable> {

public void reduce(Text key, Iterator<LongWritable> values,
OutputCollector<Text, LongWritable> output, Reporter reporter)
throws IOException {

public static class DomainStatisticsCombiner extends Reducer <Text, LongWritable, Text, LongWritable> {
public void reduce(Text key, Iterable<LongWritable> values, Context context) throws IOException, InterruptedException {
long total = 0;

while(values.hasNext()) {
LongWritable val = values.next();

for (LongWritable val : values) {
total += val.get();
}
output.collect(key, new LongWritable(total));
}
context.write(key, new LongWritable(total));
}

}

public static void main(String[] args) throws Exception {
ToolRunner.run(NutchConfiguration.create(), new DomainStatistics(), args);
}

}

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