/***********************************************************************************************************************
* 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.sort;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import eu.stratosphere.api.common.typeutils.TypeComparator;
import eu.stratosphere.api.common.typeutils.TypePairComparator;
import eu.stratosphere.api.common.typeutils.TypeSerializer;
import eu.stratosphere.api.java.record.functions.JoinFunction;
import eu.stratosphere.nephele.services.iomanager.IOManager;
import eu.stratosphere.nephele.services.memorymanager.MemoryManager;
import eu.stratosphere.nephele.services.memorymanager.spi.DefaultMemoryManager;
import eu.stratosphere.nephele.template.AbstractTask;
import eu.stratosphere.api.java.typeutils.runtime.record.RecordComparator;
import eu.stratosphere.api.java.typeutils.runtime.record.RecordPairComparator;
import eu.stratosphere.api.java.typeutils.runtime.record.RecordSerializer;
import eu.stratosphere.pact.runtime.test.util.DiscardingOutputCollector;
import eu.stratosphere.pact.runtime.test.util.DummyInvokable;
import eu.stratosphere.pact.runtime.test.util.TestData;
import eu.stratosphere.pact.runtime.test.util.TestData.Generator;
import eu.stratosphere.pact.runtime.test.util.TestData.Generator.KeyMode;
import eu.stratosphere.pact.runtime.test.util.TestData.Generator.ValueMode;
import eu.stratosphere.types.Record;
import eu.stratosphere.types.Value;
import eu.stratosphere.util.Collector;
import eu.stratosphere.util.MutableObjectIterator;
/**
*/
public class SortMergeMatchIteratorITCase
{
// total memory
private static final int MEMORY_SIZE = 1024 * 1024 * 16;
private static final int PAGES_FOR_BNLJN = 2;
// the size of the left and right inputs
private static final int INPUT_1_SIZE = 20000;
private static final int INPUT_2_SIZE = 1000;
// random seeds for the left and right input data generators
private static final long SEED1 = 561349061987311L;
private static final long SEED2 = 231434613412342L;
// dummy abstract task
private final AbstractTask parentTask = new DummyInvokable();
private IOManager ioManager;
private MemoryManager memoryManager;
private TypeSerializer<Record> serializer1;
private TypeSerializer<Record> serializer2;
private TypeComparator<Record> comparator1;
private TypeComparator<Record> comparator2;
private TypePairComparator<Record, Record> pairComparator;
@SuppressWarnings("unchecked")
@Before
public void beforeTest()
{
this.serializer1 = RecordSerializer.get();
this.serializer2 = RecordSerializer.get();
this.comparator1 = new RecordComparator(new int[] {0}, new Class[]{TestData.Key.class});
this.comparator2 = new RecordComparator(new int[] {0}, new Class[]{TestData.Key.class});
this.pairComparator = new RecordPairComparator(new int[] {0}, new int[] {0}, new Class[]{TestData.Key.class});
this.memoryManager = new DefaultMemoryManager(MEMORY_SIZE);
this.ioManager = new IOManager();
}
@After
public void afterTest()
{
if (this.ioManager != null) {
this.ioManager.shutdown();
if (!this.ioManager.isProperlyShutDown()) {
Assert.fail("I/O manager failed to properly shut down.");
}
this.ioManager = null;
}
if (this.memoryManager != null) {
Assert.assertTrue("Memory Leak: Not all memory has been returned to the memory manager.",
this.memoryManager.verifyEmpty());
this.memoryManager.shutdown();
this.memoryManager = null;
}
}
@Test
public void testMerge() {
try {
final TestData.Generator generator1 = new Generator(SEED1, 500, 4096, KeyMode.SORTED, ValueMode.RANDOM_LENGTH);
final TestData.Generator generator2 = new Generator(SEED2, 500, 2048, KeyMode.SORTED, ValueMode.RANDOM_LENGTH);
final TestData.GeneratorIterator input1 = new TestData.GeneratorIterator(generator1, INPUT_1_SIZE);
final TestData.GeneratorIterator input2 = new TestData.GeneratorIterator(generator2, INPUT_2_SIZE);
// collect expected data
final Map<TestData.Key, Collection<Match>> expectedMatchesMap = matchValues(
collectData(input1),
collectData(input2));
final JoinFunction matcher = new MatchRemovingMatcher(expectedMatchesMap);
final Collector<Record> collector = new DiscardingOutputCollector<Record>();
// reset the generators
generator1.reset();
generator2.reset();
input1.reset();
input2.reset();
// compare with iterator values
MergeMatchIterator<Record, Record, Record> iterator =
new MergeMatchIterator<Record, Record, Record>(
input1, input2, this.serializer1, this.comparator1, this.serializer2, this.comparator2,
this.pairComparator, this.memoryManager, this.ioManager, PAGES_FOR_BNLJN, this.parentTask);
iterator.open();
while (iterator.callWithNextKey(matcher, collector));
iterator.close();
// assert that each expected match was seen
for (Entry<TestData.Key, Collection<Match>> entry : expectedMatchesMap.entrySet()) {
Assert.assertTrue("Collection for key " + entry.getKey() + " is not empty", entry.getValue().isEmpty());
}
}
catch (Exception e) {
e.printStackTrace();
Assert.fail("An exception occurred during the test: " + e.getMessage());
}
}
@Test
public void testMergeWithHighNumberOfCommonKeys()
{
// the size of the left and right inputs
final int INPUT_1_SIZE = 200;
final int INPUT_2_SIZE = 100;
final int INPUT_1_DUPLICATES = 10;
final int INPUT_2_DUPLICATES = 4000;
final int DUPLICATE_KEY = 13;
try {
final TestData.Generator generator1 = new Generator(SEED1, 500, 4096, KeyMode.SORTED, ValueMode.RANDOM_LENGTH);
final TestData.Generator generator2 = new Generator(SEED2, 500, 2048, KeyMode.SORTED, ValueMode.RANDOM_LENGTH);
final TestData.GeneratorIterator gen1Iter = new TestData.GeneratorIterator(generator1, INPUT_1_SIZE);
final TestData.GeneratorIterator gen2Iter = new TestData.GeneratorIterator(generator2, INPUT_2_SIZE);
final TestData.ConstantValueIterator const1Iter = new TestData.ConstantValueIterator(DUPLICATE_KEY, "LEFT String for Duplicate Keys", INPUT_1_DUPLICATES);
final TestData.ConstantValueIterator const2Iter = new TestData.ConstantValueIterator(DUPLICATE_KEY, "RIGHT String for Duplicate Keys", INPUT_2_DUPLICATES);
final List<MutableObjectIterator<Record>> inList1 = new ArrayList<MutableObjectIterator<Record>>();
inList1.add(gen1Iter);
inList1.add(const1Iter);
final List<MutableObjectIterator<Record>> inList2 = new ArrayList<MutableObjectIterator<Record>>();
inList2.add(gen2Iter);
inList2.add(const2Iter);
MutableObjectIterator<Record> input1 = new MergeIterator<Record>(inList1, serializer1, comparator1.duplicate());
MutableObjectIterator<Record> input2 = new MergeIterator<Record>(inList2, serializer2, comparator2.duplicate());
// collect expected data
final Map<TestData.Key, Collection<Match>> expectedMatchesMap = matchValues(
collectData(input1),
collectData(input2));
// re-create the whole thing for actual processing
// reset the generators and iterators
generator1.reset();
generator2.reset();
const1Iter.reset();
const2Iter.reset();
gen1Iter.reset();
gen2Iter.reset();
inList1.clear();
inList1.add(gen1Iter);
inList1.add(const1Iter);
inList2.clear();
inList2.add(gen2Iter);
inList2.add(const2Iter);
input1 = new MergeIterator<Record>(inList1, serializer1, comparator1.duplicate());
input2 = new MergeIterator<Record>(inList2, serializer2, comparator2.duplicate());
final JoinFunction matcher = new MatchRemovingMatcher(expectedMatchesMap);
final Collector<Record> collector = new DiscardingOutputCollector<Record>();
// we create this sort-merge iterator with little memory for the block-nested-loops fall-back to make sure it
// needs to spill for the duplicate keys
MergeMatchIterator<Record, Record, Record> iterator =
new MergeMatchIterator<Record, Record, Record>(
input1, input2, this.serializer1, this.comparator1, this.serializer2, this.comparator2,
this.pairComparator, this.memoryManager, this.ioManager, PAGES_FOR_BNLJN, this.parentTask);
iterator.open();
while (iterator.callWithNextKey(matcher, collector));
iterator.close();
// assert that each expected match was seen
for (Entry<TestData.Key, Collection<Match>> entry : expectedMatchesMap.entrySet()) {
if (!entry.getValue().isEmpty()) {
Assert.fail("Collection for key " + entry.getKey() + " is not empty");
}
}
}
catch (Exception e) {
e.printStackTrace();
Assert.fail("An exception occurred during the test: " + e.getMessage());
}
}
// --------------------------------------------------------------------------------------------
// Utilities
// --------------------------------------------------------------------------------------------
private Map<TestData.Key, Collection<Match>> matchValues(
Map<TestData.Key, Collection<TestData.Value>> leftMap,
Map<TestData.Key, Collection<TestData.Value>> rightMap)
{
Map<TestData.Key, Collection<Match>> map = new HashMap<TestData.Key, Collection<Match>>();
for (TestData.Key key : leftMap.keySet()) {
Collection<TestData.Value> leftValues = leftMap.get(key);
Collection<TestData.Value> rightValues = rightMap.get(key);
if (rightValues == null) {
continue;
}
if (!map.containsKey(key)) {
map.put(key, new ArrayList<Match>());
}
Collection<Match> matchedValues = map.get(key);
for (TestData.Value leftValue : leftValues) {
for (TestData.Value rightValue : rightValues) {
matchedValues.add(new Match(leftValue, rightValue));
}
}
}
return map;
}
private Map<TestData.Key, Collection<TestData.Value>> collectData(MutableObjectIterator<Record> iter)
throws Exception
{
Map<TestData.Key, Collection<TestData.Value>> map = new HashMap<TestData.Key, Collection<TestData.Value>>();
Record pair = new Record();
while ((pair = iter.next(pair)) != null) {
TestData.Key key = pair.getField(0, TestData.Key.class);
if (!map.containsKey(key)) {
map.put(new TestData.Key(key.getKey()), new ArrayList<TestData.Value>());
}
Collection<TestData.Value> values = map.get(key);
values.add(new TestData.Value(pair.getField(1, TestData.Value.class).getValue()));
}
return map;
}
/**
* Private class used for storage of the expected matches in a hashmap.
*/
private static class Match {
private final Value left;
private final Value right;
public Match(Value left, Value right) {
this.left = left;
this.right = right;
}
@Override
public boolean equals(Object obj) {
Match o = (Match) obj;
return this.left.equals(o.left) && this.right.equals(o.right);
}
@Override
public int hashCode() {
return this.left.hashCode() ^ this.right.hashCode();
}
@Override
public String toString() {
return left + ", " + right;
}
}
private static final class MatchRemovingMatcher extends JoinFunction {
private static final long serialVersionUID = 1L;
private final Map<TestData.Key, Collection<Match>> toRemoveFrom;
protected MatchRemovingMatcher(Map<TestData.Key, Collection<Match>> map) {
this.toRemoveFrom = map;
}
@Override
public void join(Record rec1, Record rec2, Collector<Record> out)
{
TestData.Key key = rec1.getField(0, TestData.Key.class);
TestData.Value value1 = rec1.getField(1, TestData.Value.class);
TestData.Value value2 = rec2.getField(1, TestData.Value.class);
Collection<Match> matches = this.toRemoveFrom.get(key);
if (matches == null) {
Assert.fail("Match " + key + " - " + value1 + ":" + value2 + " is unexpected.");
}
boolean contained = matches.remove(new Match(value1, value2));
if (!contained) {
Assert.fail("Produced match was not contained: " + key + " - " + value1 + ":" + value2);
}
if (matches.isEmpty()) {
this.toRemoveFrom.remove(key);
}
}
}
}