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* 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.
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package org.apache.flink.runtime.operators;
import java.util.ArrayList;
import java.util.List;
import org.apache.commons.lang.Validate;
import org.apache.flink.api.common.ExecutionConfig;
import org.apache.flink.api.common.functions.GroupCombineFunction;
import org.apache.flink.api.common.functions.GroupReduceFunction;
import org.apache.flink.types.Value;
import org.junit.Assert;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.flink.api.common.functions.RichGroupReduceFunction;
import org.apache.flink.runtime.testutils.recordutils.RecordComparator;
import org.apache.flink.runtime.testutils.recordutils.RecordSerializerFactory;
import org.apache.flink.runtime.operators.sort.CombiningUnilateralSortMerger;
import org.apache.flink.runtime.operators.testutils.DriverTestBase;
import org.apache.flink.runtime.operators.testutils.UniformRecordGenerator;
import org.apache.flink.types.IntValue;
import org.apache.flink.types.Record;
import org.apache.flink.util.Collector;
import org.junit.Test;
public class ReduceTaskExternalITCase extends DriverTestBase<RichGroupReduceFunction<Record, Record>>
{
private static final Logger LOG = LoggerFactory.getLogger(ReduceTaskExternalITCase.class);
@SuppressWarnings("unchecked")
private final RecordComparator comparator = new RecordComparator(
new int[]{0}, (Class<? extends Value>[])new Class[]{ IntValue.class });
private final List<Record> outList = new ArrayList<>();
public ReduceTaskExternalITCase(ExecutionConfig config) {
super(config, 0, 1, 3*1024*1024);
}
@Test
public void testSingleLevelMergeReduceTask() {
final int keyCnt = 8192;
final int valCnt = 8;
setNumFileHandlesForSort(2);
addDriverComparator(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<>();
testDriver(testTask, MockReduceStub.class);
} catch (Exception e) {
LOG.info("Exception while running the test task.", e);
Assert.fail("Exception in Test: " + e.getMessage());
}
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);
addDriverComparator(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<>();
testDriver(testTask, MockReduceStub.class);
} catch (Exception e) {
LOG.info("Exception while running the test task.", e);
Assert.fail("Exception in Test: " + e.getMessage());
}
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;
addDriverComparator(this.comparator);
setOutput(this.outList);
getTaskConfig().setDriverStrategy(DriverStrategy.SORTED_GROUP_REDUCE);
CombiningUnilateralSortMerger<Record> sorter = null;
try {
sorter = new CombiningUnilateralSortMerger<>(new MockCombiningReduceStub(),
getMemoryManager(), getIOManager(), new UniformRecordGenerator(keyCnt, valCnt, false),
getContainingTask(), RecordSerializerFactory.get(), this.comparator.duplicate(),
this.perSortFractionMem,
2, 0.8f, true /* use large record handler */, true);
addInput(sorter.getIterator());
GroupReduceDriver<Record, Record> testTask = new GroupReduceDriver<>();
testDriver(testTask, MockCombiningReduceStub.class);
} catch (Exception e) {
LOG.info("Exception while running the test task.", e);
Assert.fail("Invoke method caused exception: " + e.getMessage());
} 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;
addDriverComparator(this.comparator);
setOutput(this.outList);
getTaskConfig().setDriverStrategy(DriverStrategy.SORTED_GROUP_REDUCE);
CombiningUnilateralSortMerger<Record> sorter = null;
try {
sorter = new CombiningUnilateralSortMerger<>(new MockCombiningReduceStub(),
getMemoryManager(), getIOManager(), new UniformRecordGenerator(keyCnt, valCnt, false),
getContainingTask(), RecordSerializerFactory.get(), this.comparator.duplicate(),
this.perSortFractionMem,
2, 0.8f, true /* use large record handler */, false);
addInput(sorter.getIterator());
GroupReduceDriver<Record, Record> testTask = new GroupReduceDriver<>();
testDriver(testTask, MockCombiningReduceStub.class);
} catch (Exception e) {
LOG.info("Exception while running the test task.", e);
Assert.fail("Invoke method caused exception: " + e.getMessage());
} 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 RichGroupReduceFunction<Record, Record> {
private static final long serialVersionUID = 1L;
private final IntValue key = new IntValue();
private final IntValue value = new IntValue();
@Override
public void reduce(Iterable<Record> records, Collector<Record> out) {
Record element = null;
int cnt = 0;
for (Record next : records) {
element = next;
cnt++;
}
element.getField(0, this.key);
this.value.setValue(cnt - this.key.getValue());
element.setField(1, this.value);
out.collect(element);
}
}
public static class MockCombiningReduceStub implements
GroupReduceFunction<Record, Record>, GroupCombineFunction<Record, Record> {
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(Iterable<Record> records, Collector<Record> out) {
Record element = null;
int sum = 0;
for (Record next : records) {
element = 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(Iterable<Record> records, Collector<Record> out) {
Record element = null;
int sum = 0;
for (Record next : records) {
element = next;
element.getField(1, this.combineValue);
sum += this.combineValue.getValue();
}
this.combineValue.setValue(sum);
element.setField(1, this.combineValue);
out.collect(element);
}
}
}