| /* |
| * Copyright 2014 Stresso authors (see AUTHORS) |
| * |
| * 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 stresso.trie; |
| |
| import java.io.IOException; |
| import java.util.Iterator; |
| |
| import com.google.common.annotations.VisibleForTesting; |
| 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.JobClient; |
| import org.apache.hadoop.mapred.JobConf; |
| import org.apache.hadoop.mapred.MapReduceBase; |
| import org.apache.hadoop.mapred.OutputCollector; |
| import org.apache.hadoop.mapred.Reducer; |
| import org.apache.hadoop.mapred.Reporter; |
| import org.apache.hadoop.mapred.RunningJob; |
| import org.apache.hadoop.mapred.SequenceFileInputFormat; |
| import org.apache.hadoop.mapred.lib.NullOutputFormat; |
| import org.apache.hadoop.util.Tool; |
| import org.apache.hadoop.util.ToolRunner; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| public class Unique extends Configured implements Tool { |
| |
| private static final Logger log = LoggerFactory.getLogger(Unique.class); |
| |
| public static enum Stats { |
| UNIQUE; |
| } |
| |
| public static class UniqueReducer extends MapReduceBase implements Reducer<LongWritable,NullWritable,LongWritable,NullWritable> { |
| @Override |
| public void reduce(LongWritable key, Iterator<NullWritable> values, OutputCollector<LongWritable,NullWritable> output, Reporter reporter) throws IOException { |
| reporter.getCounter(Stats.UNIQUE).increment(1); |
| } |
| } |
| |
| |
| private static int numUnique = 0; |
| |
| @VisibleForTesting |
| public static int getNumUnique() { |
| return numUnique; |
| } |
| |
| @Override |
| public int run(String[] args) throws Exception { |
| |
| if (args.length < 1) { |
| log.error("Usage: " + this.getClass().getSimpleName() + "<input dir>{ <input dir>}"); |
| System.exit(-1); |
| } |
| |
| JobConf job = new JobConf(getConf()); |
| |
| job.setJobName(Unique.class.getName()); |
| job.setJarByClass(Unique.class); |
| |
| job.setInputFormat(SequenceFileInputFormat.class); |
| for (String arg : args) { |
| SequenceFileInputFormat.addInputPath(job, new Path(arg)); |
| } |
| |
| job.setMapOutputKeyClass(LongWritable.class); |
| job.setMapOutputValueClass(NullWritable.class); |
| |
| job.setReducerClass(UniqueReducer.class); |
| |
| job.setOutputFormat(NullOutputFormat.class); |
| |
| RunningJob runningJob = JobClient.runJob(job); |
| runningJob.waitForCompletion(); |
| numUnique = (int) runningJob.getCounters().getCounter(Stats.UNIQUE); |
| |
| log.debug("numUnique : "+numUnique); |
| |
| return runningJob.isSuccessful() ? 0 : -1; |
| |
| } |
| |
| public static void main(String[] args) throws Exception { |
| int ret = ToolRunner.run(new Unique(), args); |
| System.exit(ret); |
| } |
| |
| } |