/***********************************************************************************************************************
* Copyright (C) 2010-2013 by the Stratosphere project (http://stratosphere.eu)
*
* 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 eu.stratosphere.test.operators;
import eu.stratosphere.api.common.Plan;
import eu.stratosphere.api.java.record.operators.FileDataSink;
import eu.stratosphere.api.java.record.operators.FileDataSource;
import eu.stratosphere.api.java.record.functions.ReduceFunction;
import eu.stratosphere.api.java.record.io.DelimitedInputFormat;
import eu.stratosphere.api.java.record.operators.ReduceOperator;
import eu.stratosphere.compiler.DataStatistics;
import eu.stratosphere.compiler.PactCompiler;
import eu.stratosphere.compiler.plan.OptimizedPlan;
import eu.stratosphere.compiler.plantranslate.NepheleJobGraphGenerator;
import eu.stratosphere.configuration.Configuration;
import eu.stratosphere.nephele.jobgraph.JobGraph;
import eu.stratosphere.test.operators.io.ContractITCaseIOFormats.ContractITCaseInputFormat;
import eu.stratosphere.test.operators.io.ContractITCaseIOFormats.ContractITCaseOutputFormat;
import eu.stratosphere.test.util.RecordAPITestBase;
import eu.stratosphere.types.IntValue;
import eu.stratosphere.types.Record;
import eu.stratosphere.types.StringValue;
import eu.stratosphere.util.Collector;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameters;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.Serializable;
import java.util.Collection;
import java.util.Iterator;
import java.util.LinkedList;
@RunWith(Parameterized.class)
public class ReduceITCase extends RecordAPITestBase {
private static final Log LOG = LogFactory.getLog(ReduceITCase.class);
String inPath = null;
String resultPath = null;
public ReduceITCase(Configuration testConfig) {
super(testConfig);
}
private static final String IN = "1 1\n2 2\n2 8\n4 4\n4 4\n6 6\n7 7\n8 8\n1 1\n" +
"2 2\n2 2\n4 4\n4 4\n6 3\n5 9\n8 8\n1 1\n2 2\n2 2\n3 0\n4 4\n5 9\n7 7\n8 8\n" +
"1 1\n9 1\n5 9\n4 4\n4 4\n6 6\n7 7\n8 8\n";
private static final String RESULT = "1 4\n2 18\n3 0\n4 28\n5 27\n6 15\n7 21\n8 32\n9 1\n";
@Override
protected void preSubmit() throws Exception {
inPath = createTempFile("in.txt", IN);
resultPath = getTempDirPath("result");
}
@ReduceOperator.Combinable
public static class TestReducer extends ReduceFunction implements Serializable {
private static final long serialVersionUID = 1L;
private StringValue reduceValue = new StringValue();
private StringValue combineValue = new StringValue();
@Override
public void combine(Iterator<Record> records, Collector<Record> out) throws Exception {
int sum = 0;
Record record = new Record();
while (records.hasNext()) {
record = records.next();
combineValue = record.getField(1, combineValue);
sum += Integer.parseInt(combineValue.toString());
LOG.debug("Processed: [" + record.getField(0, StringValue.class).toString() +
"," + combineValue.toString() + "]");
}
combineValue.setValue(sum + "");
record.setField(1, combineValue);
out.collect(record);
}
@Override
public void reduce(Iterator<Record> records, Collector<Record> out) throws Exception {
int sum = 0;
Record record = new Record();
while (records.hasNext()) {
record = records.next();
reduceValue = record.getField(1, reduceValue);
sum += Integer.parseInt(reduceValue.toString());
LOG.debug("Processed: [" + record.getField(0, StringValue.class).toString() +
"," + reduceValue.toString() + "]");
}
record.setField(1, new IntValue(sum));
out.collect(record);
}
}
@Override
protected JobGraph getJobGraph() throws Exception {
FileDataSource input = new FileDataSource(
new ContractITCaseInputFormat(), inPath);
DelimitedInputFormat.configureDelimitedFormat(input)
.recordDelimiter('\n');
input.setDegreeOfParallelism(config.getInteger("ReduceTest#NoSubtasks", 1));
ReduceOperator testReducer = ReduceOperator.builder(new TestReducer(), StringValue.class, 0)
.build();
testReducer.setDegreeOfParallelism(config.getInteger("ReduceTest#NoSubtasks", 1));
testReducer.getParameters().setString(PactCompiler.HINT_LOCAL_STRATEGY,
config.getString("ReduceTest#LocalStrategy", ""));
testReducer.getParameters().setString(PactCompiler.HINT_SHIP_STRATEGY,
config.getString("ReduceTest#ShipStrategy", ""));
FileDataSink output = new FileDataSink(
new ContractITCaseOutputFormat(), resultPath);
output.setDegreeOfParallelism(1);
output.setInput(testReducer);
testReducer.setInput(input);
Plan plan = new Plan(output);
PactCompiler pc = new PactCompiler(new DataStatistics());
OptimizedPlan op = pc.compile(plan);
NepheleJobGraphGenerator jgg = new NepheleJobGraphGenerator();
return jgg.compileJobGraph(op);
}
@Override
protected void postSubmit() throws Exception {
compareResultsByLinesInMemory(RESULT, resultPath);
}
@Parameters
public static Collection<Object[]> getConfigurations() throws FileNotFoundException, IOException {
LinkedList<Configuration> tConfigs = new LinkedList<Configuration>();
String[] localStrategies = { PactCompiler.HINT_LOCAL_STRATEGY_SORT };
String[] shipStrategies = { PactCompiler.HINT_SHIP_STRATEGY_REPARTITION_HASH };
for (String localStrategy : localStrategies) {
for (String shipStrategy : shipStrategies) {
Configuration config = new Configuration();
config.setString("ReduceTest#LocalStrategy", localStrategy);
config.setString("ReduceTest#ShipStrategy", shipStrategy);
config.setInteger("ReduceTest#NoSubtasks", 4);
tConfigs.add(config);
}
}
return toParameterList(tConfigs);
}
}