/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.hadoop.mapred;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import org.apache.hadoop.fs.FileUtil;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.lib.IdentityMapper;
import org.apache.hadoop.mapred.lib.IdentityReducer;
public class TestUserDefinedCounters extends ClusterMapReduceTestCase {
enum EnumCounter { MAP_RECORDS }
static class CountingMapper<K, V> extends IdentityMapper<K, V> {
public void map(K key, V value,
OutputCollector<K, V> output, Reporter reporter)
throws IOException {
output.collect(key, value);
reporter.incrCounter(EnumCounter.MAP_RECORDS, 1);
reporter.incrCounter("StringCounter", "MapRecords", 1);
}
}
public void testMapReduceJob() throws Exception {
OutputStream os = getFileSystem().create(new Path(getInputDir(), "text.txt"));
Writer wr = new OutputStreamWriter(os);
wr.write("hello1\n");
wr.write("hello2\n");
wr.write("hello3\n");
wr.write("hello4\n");
wr.close();
JobConf conf = createJobConf();
conf.setJobName("counters");
conf.setInputFormat(TextInputFormat.class);
conf.setMapOutputKeyClass(LongWritable.class);
conf.setMapOutputValueClass(Text.class);
conf.setOutputFormat(TextOutputFormat.class);
conf.setOutputKeyClass(LongWritable.class);
conf.setOutputValueClass(Text.class);
conf.setMapperClass(CountingMapper.class);
conf.setReducerClass(IdentityReducer.class);
FileInputFormat.setInputPaths(conf, getInputDir());
FileOutputFormat.setOutputPath(conf, getOutputDir());
RunningJob runningJob = JobClient.runJob(conf);
Path[] outputFiles = FileUtil.stat2Paths(
getFileSystem().listStatus(getOutputDir(),
new OutputLogFilter()));
if (outputFiles.length > 0) {
InputStream is = getFileSystem().open(outputFiles[0]);
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
String line = reader.readLine();
int counter = 0;
while (line != null) {
counter++;
assertTrue(line.contains("hello"));
line = reader.readLine();
}
reader.close();
assertEquals(4, counter);
}
assertEquals(4,
runningJob.getCounters().getCounter(EnumCounter.MAP_RECORDS));
assertEquals(4,
runningJob.getCounters().getGroup("StringCounter")
.getCounter("MapRecords"));
}
}