/***********************************************************************************************************************
* 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.Iterator;
import java.util.List;
import junit.framework.Assert;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.junit.Test;
import eu.stratosphere.api.common.functions.GenericGroupReduce;
import eu.stratosphere.api.java.record.functions.ReduceFunction;
import eu.stratosphere.api.java.record.operators.ReduceOperator.Combinable;
import eu.stratosphere.api.java.typeutils.runtime.record.RecordComparator;
import eu.stratosphere.api.java.typeutils.runtime.record.RecordSerializerFactory;
import eu.stratosphere.pact.runtime.sort.CombiningUnilateralSortMerger;
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;
import eu.stratosphere.util.Collector;
public class ReduceTaskExternalITCase extends DriverTestBase<GenericGroupReduce<Record, Record>>
{
private static final Log LOG = LogFactory.getLog(ReduceTaskExternalITCase.class);
@SuppressWarnings("unchecked")
private final RecordComparator comparator = new RecordComparator(
new int[]{0}, (Class<? extends Key<?>>[])new Class[]{ IntValue.class });
private final List<Record> outList = new ArrayList<Record>();
public ReduceTaskExternalITCase() {
super(0, 1, 3*1024*1024);
}
@Test
public void testSingleLevelMergeReduceTask() {
final int keyCnt = 8192;
final int valCnt = 8;
setNumFileHandlesForSort(2);
addInputComparator(this.comparator);
setOutput(this.outList);
getTaskConfig().setDriverStrategy(DriverStrategy.SORTED_GROUP_REDUCE);
try {
addInputSorted(new UniformRecordGenerator(keyCnt, valCnt, false), this.comparator.duplicate());
GroupReduceDriver<Record, Record> testTask = new GroupReduceDriver<Record, Record>();
testDriver(testTask, MockReduceStub.class);
} catch (Exception e) {
LOG.debug(e);
Assert.fail("Exception in Test.");
}
Assert.assertTrue("Resultset size was "+this.outList.size()+". Expected was "+keyCnt, this.outList.size() == keyCnt);
for(Record record : this.outList) {
Assert.assertTrue("Incorrect result", record.getField(1, IntValue.class).getValue() == valCnt-record.getField(0, IntValue.class).getValue());
}
this.outList.clear();
}
@Test
public void testMultiLevelMergeReduceTask() {
final int keyCnt = 32768;
final int valCnt = 8;
setNumFileHandlesForSort(2);
addInputComparator(this.comparator);
setOutput(this.outList);
getTaskConfig().setDriverStrategy(DriverStrategy.SORTED_GROUP_REDUCE);
try {
addInputSorted(new UniformRecordGenerator(keyCnt, valCnt, false), this.comparator.duplicate());
GroupReduceDriver<Record, Record> testTask = new GroupReduceDriver<Record, Record>();
testDriver(testTask, MockReduceStub.class);
} catch (Exception e) {
LOG.debug(e);
Assert.fail("Exception in Test.");
}
Assert.assertTrue("Resultset size was "+this.outList.size()+". Expected was "+keyCnt, this.outList.size() == keyCnt);
for(Record record : this.outList) {
Assert.assertTrue("Incorrect result", record.getField(1, IntValue.class).getValue() == valCnt-record.getField(0, IntValue.class).getValue());
}
this.outList.clear();
}
@Test
public void testSingleLevelMergeCombiningReduceTask()
{
final int keyCnt = 8192;
final int valCnt = 8;
addInputComparator(this.comparator);
setOutput(this.outList);
getTaskConfig().setDriverStrategy(DriverStrategy.SORTED_GROUP_REDUCE);
CombiningUnilateralSortMerger<Record> sorter = null;
try {
sorter = new CombiningUnilateralSortMerger<Record>(new MockCombiningReduceStub(),
getMemoryManager(), getIOManager(), new UniformRecordGenerator(keyCnt, valCnt, false),
getOwningNepheleTask(), RecordSerializerFactory.get(), this.comparator.duplicate(), this.perSortMem, 2, 0.8f);
addInput(sorter.getIterator());
GroupReduceDriver<Record, Record> testTask = new GroupReduceDriver<Record, Record>();
testDriver(testTask, MockCombiningReduceStub.class);
} catch (Exception e) {
LOG.debug(e);
Assert.fail("Invoke method caused exception.");
} finally {
if (sorter != null) {
sorter.close();
}
}
int expSum = 0;
for (int i = 1; i < valCnt; i++) {
expSum += i;
}
Assert.assertTrue("Resultset size was "+this.outList.size()+". Expected was "+keyCnt, this.outList.size() == keyCnt);
for (Record record : this.outList) {
Assert.assertTrue("Incorrect result", record.getField(1, IntValue.class).getValue() == expSum-record.getField(0, IntValue.class).getValue());
}
this.outList.clear();
}
@Test
public void testMultiLevelMergeCombiningReduceTask() {
int keyCnt = 32768;
int valCnt = 8;
addInputComparator(this.comparator);
setOutput(this.outList);
getTaskConfig().setDriverStrategy(DriverStrategy.SORTED_GROUP_REDUCE);
CombiningUnilateralSortMerger<Record> sorter = null;
try {
sorter = new CombiningUnilateralSortMerger<Record>(new MockCombiningReduceStub(),
getMemoryManager(), getIOManager(), new UniformRecordGenerator(keyCnt, valCnt, false),
getOwningNepheleTask(), RecordSerializerFactory.get(), this.comparator.duplicate(), this.perSortMem, 2, 0.8f);
addInput(sorter.getIterator());
GroupReduceDriver<Record, Record> testTask = new GroupReduceDriver<Record, Record>();
testDriver(testTask, MockCombiningReduceStub.class);
} catch (Exception e) {
LOG.debug(e);
Assert.fail("Invoke method caused exception.");
} finally {
if (sorter != null) {
sorter.close();
}
}
int expSum = 0;
for (int i = 1; i < valCnt; i++) {
expSum += i;
}
Assert.assertTrue("Resultset size was "+this.outList.size()+". Expected was "+keyCnt, this.outList.size() == keyCnt);
for (Record record : this.outList) {
Assert.assertTrue("Incorrect result", record.getField(1, IntValue.class).getValue() == expSum-record.getField(0, IntValue.class).getValue());
}
this.outList.clear();
}
public static class MockReduceStub extends ReduceFunction {
private static final long serialVersionUID = 1L;
private final IntValue key = new IntValue();
private final IntValue value = new IntValue();
@Override
public void reduce(Iterator<Record> records, Collector<Record> out)
throws Exception {
Record element = null;
int cnt = 0;
while (records.hasNext()) {
element = records.next();
cnt++;
}
element.getField(0, this.key);
this.value.setValue(cnt - this.key.getValue());
element.setField(1, this.value);
out.collect(element);
}
}
@Combinable
public static class MockCombiningReduceStub extends ReduceFunction {
private static final long serialVersionUID = 1L;
private final IntValue key = new IntValue();
private final IntValue value = new IntValue();
private final IntValue combineValue = new IntValue();
@Override
public void reduce(Iterator<Record> records, Collector<Record> out)
throws Exception {
Record element = null;
int sum = 0;
while (records.hasNext()) {
element = records.next();
element.getField(1, this.value);
sum += this.value.getValue();
}
element.getField(0, this.key);
this.value.setValue(sum - this.key.getValue());
element.setField(1, this.value);
out.collect(element);
}
@Override
public void combine(Iterator<Record> records, Collector<Record> out)
throws Exception {
Record element = null;
int sum = 0;
while (records.hasNext()) {
element = records.next();
element.getField(1, this.combineValue);
sum += this.combineValue.getValue();
}
this.combineValue.setValue(sum);
element.setField(1, this.combineValue);
out.collect(element);
}
}
}