/***********************************************************************************************************************
* 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.pact.runtime.task;
import java.util.ArrayList;
import java.util.HashMap;
import junit.framework.Assert;
import org.junit.Test;
import eu.stratosphere.api.common.functions.GenericGroupReduce;
import eu.stratosphere.api.java.typeutils.runtime.record.RecordComparator;
import eu.stratosphere.pact.runtime.task.CombineTaskTest.MockCombiningReduceStub;
import eu.stratosphere.pact.runtime.test.util.DriverTestBase;
import eu.stratosphere.pact.runtime.test.util.UniformRecordGenerator;
import eu.stratosphere.types.IntValue;
import eu.stratosphere.types.Key;
import eu.stratosphere.types.Record;
public class CombineTaskExternalITCase extends DriverTestBase<GenericGroupReduce<Record, ?>> {
private static final long COMBINE_MEM = 3 * 1024 * 1024;
private final ArrayList<Record> outList = new ArrayList<Record>();
@SuppressWarnings("unchecked")
private final RecordComparator comparator = new RecordComparator(
new int[]{0}, (Class<? extends Key<?>>[])new Class[]{ IntValue.class });
public CombineTaskExternalITCase() {
super(COMBINE_MEM, 0);
}
@Test
public void testSingleLevelMergeCombineTask() {
final int keyCnt = 40000;
final int valCnt = 8;
addInput(new UniformRecordGenerator(keyCnt, valCnt, false));
addInputComparator(this.comparator);
setOutput(this.outList);
getTaskConfig().setDriverStrategy(DriverStrategy.SORTED_GROUP_COMBINE);
getTaskConfig().setMemoryDriver(COMBINE_MEM);
getTaskConfig().setFilehandlesDriver(2);
final GroupReduceCombineDriver<Record> testTask = new GroupReduceCombineDriver<Record>();
try {
testDriver(testTask, MockCombiningReduceStub.class);
} catch (Exception e) {
e.printStackTrace();
Assert.fail("Invoke method caused exception.");
}
int expSum = 0;
for (int i = 1;i < valCnt; i++) {
expSum += i;
}
// wee need to do the final aggregation manually in the test, because the
// combiner is not guaranteed to do that
final HashMap<IntValue, IntValue> aggMap = new HashMap<IntValue, IntValue>();
for (Record record : this.outList) {
IntValue key = new IntValue();
IntValue value = new IntValue();
key = record.getField(0, key);
value = record.getField(1, value);
IntValue prevVal = aggMap.get(key);
if (prevVal != null) {
aggMap.put(key, new IntValue(prevVal.getValue() + value.getValue()));
}
else {
aggMap.put(key, value);
}
}
Assert.assertTrue("Resultset size was "+aggMap.size()+". Expected was "+keyCnt, aggMap.size() == keyCnt);
for (IntValue integer : aggMap.values()) {
Assert.assertTrue("Incorrect result", integer.getValue() == expSum);
}
this.outList.clear();
}
@Test
public void testMultiLevelMergeCombineTask() throws Exception {
final int keyCnt = 100000;
final int valCnt = 8;
addInput(new UniformRecordGenerator(keyCnt, valCnt, false));
addInputComparator(this.comparator);
setOutput(this.outList);
getTaskConfig().setDriverStrategy(DriverStrategy.SORTED_GROUP_COMBINE);
getTaskConfig().setMemoryDriver(COMBINE_MEM);
getTaskConfig().setFilehandlesDriver(2);
final GroupReduceCombineDriver<Record> testTask = new GroupReduceCombineDriver<Record>();
try {
testDriver(testTask, MockCombiningReduceStub.class);
} catch (Exception e) {
e.printStackTrace();
Assert.fail("Invoke method caused exception.");
}
int expSum = 0;
for (int i = 1;i < valCnt; i++) {
expSum += i;
}
// wee need to do the final aggregation manually in the test, because the
// combiner is not guaranteed to do that
final HashMap<IntValue, IntValue> aggMap = new HashMap<IntValue, IntValue>();
for (Record record : this.outList) {
IntValue key = new IntValue();
IntValue value = new IntValue();
key = record.getField(0, key);
value = record.getField(1, value);
IntValue prevVal = aggMap.get(key);
if (prevVal != null) {
aggMap.put(key, new IntValue(prevVal.getValue() + value.getValue()));
}
else {
aggMap.put(key, value);
}
}
Assert.assertTrue("Resultset size was "+aggMap.size()+". Expected was "+keyCnt, aggMap.size() == keyCnt);
for (IntValue integer : aggMap.values()) {
Assert.assertTrue("Incorrect result", integer.getValue() == expSum);
}
this.outList.clear();
}
}