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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* 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.
*/
package org.apache.flink.runtime.operators.hash;
import org.apache.flink.api.common.functions.FlatJoinFunction;
import org.apache.flink.api.common.typeutils.TypeComparator;
import org.apache.flink.api.common.typeutils.TypePairComparator;
import org.apache.flink.api.common.typeutils.TypeSerializer;
import org.apache.flink.core.memory.MemorySegment;
import org.apache.flink.runtime.io.disk.iomanager.IOManager;
import org.apache.flink.runtime.jobgraph.tasks.AbstractInvokable;
import org.apache.flink.runtime.memory.MemoryAllocationException;
import org.apache.flink.runtime.memory.MemoryManager;
import org.apache.flink.runtime.operators.util.JoinTaskIterator;
import org.apache.flink.util.Collector;
import org.apache.flink.util.MutableObjectIterator;
import java.io.IOException;
import java.util.List;
/**
* An implementation of the {@link org.apache.flink.runtime.operators.util.JoinTaskIterator} that uses a hybrid-hash-join
* internally to match the records with equal key. The build side of the hash is the second input of the match.
*/
public class NonReusingBuildSecondHashJoinIterator extends HashJoinIteratorBase implements JoinTaskIterator {
protected final MutableHashTable hashJoin;
protected final TypeSerializer probeSideSerializer;
private final MemoryManager memManager;
private final MutableObjectIterator firstInput;
private final MutableObjectIterator secondInput;
private final boolean buildSideOuterJoin;
private final boolean probeSideOuterJoin;
private volatile boolean running = true;
// --------------------------------------------------------------------------------------------
public NonReusingBuildSecondHashJoinIterator(
MutableObjectIterator firstInput,
MutableObjectIterator secondInput,
TypeSerializer serializer1,
TypeComparator comparator1,
TypeSerializer serializer2,
TypeComparator comparator2,
TypePairComparator pairComparator,
MemoryManager memManager, IOManager ioManager,
AbstractInvokable ownerTask,
double memoryFraction,
boolean probeSideOuterJoin,
boolean buildSideOuterJoin,
boolean useBitmapFilters) throws MemoryAllocationException {
this.memManager = memManager;
this.firstInput = firstInput;
this.secondInput = secondInput;
this.probeSideSerializer = serializer1;
if(useBitmapFilters && probeSideOuterJoin) {
throw new IllegalArgumentException("Bitmap filter may not be activated for joining with empty build side");
}
this.probeSideOuterJoin = probeSideOuterJoin;
this.buildSideOuterJoin = buildSideOuterJoin;
this.hashJoin = getHashJoin(serializer2, comparator2, serializer1,
comparator1, pairComparator, memManager, ioManager, ownerTask, memoryFraction, useBitmapFilters);
}
// --------------------------------------------------------------------------------------------
@Override
public void open() throws IOException, MemoryAllocationException, InterruptedException {
this.hashJoin.open(this.secondInput, this.firstInput, buildSideOuterJoin);
}
@Override
public void close() {
// close the join
this.hashJoin.close();
// free the memory
final List segments = this.hashJoin.getFreedMemory();
this.memManager.release(segments);
}
@Override
public boolean callWithNextKey(FlatJoinFunction matchFunction, Collector collector)
throws Exception
{
if (this.hashJoin.nextRecord())
{
// we have a next record, get the iterators to the probe and build side values
final MutableObjectIterator buildSideIterator = this.hashJoin.getBuildSideIterator();
final V1 probeRecord = this.hashJoin.getCurrentProbeRecord();
V2 nextBuildSideRecord = buildSideIterator.next();
if (probeRecord != null && nextBuildSideRecord != null) {
V2 tmpRec;
// check if there is another build-side value
if ((tmpRec = buildSideIterator.next()) != null) {
// more than one build-side value --> copy the probe side
V1 probeCopy;
probeCopy = this.probeSideSerializer.copy(probeRecord);
// call match on the first pair
matchFunction.join(probeCopy, nextBuildSideRecord, collector);
// call match on the second pair
probeCopy = this.probeSideSerializer.copy(probeRecord);
matchFunction.join(probeCopy, tmpRec, collector);
while (this.running && ((nextBuildSideRecord = buildSideIterator.next()) != null)) {
// call match on the next pair
// make sure we restore the value of the probe side record
probeCopy = this.probeSideSerializer.copy(probeRecord);
matchFunction.join(probeCopy, nextBuildSideRecord, collector);
}
}
else {
// only single pair matches
matchFunction.join(probeRecord, nextBuildSideRecord, collector);
}
} else {
// while probe side outer join, join current probe record with null.
if (probeSideOuterJoin && probeRecord != null && nextBuildSideRecord == null) {
matchFunction.join(probeRecord, null, collector);
}
// while build side outer join, iterate all build records which have not been probed before,
// and join with null.
if (buildSideOuterJoin && probeRecord == null && nextBuildSideRecord != null) {
matchFunction.join(null, nextBuildSideRecord, collector);
while (this.running && ((nextBuildSideRecord = buildSideIterator.next()) != null)) {
matchFunction.join(null, nextBuildSideRecord, collector);
}
}
}
return true;
}
else {
return false;
}
}
@Override
public void abort() {
this.running = false;
this.hashJoin.abort();
}
}
