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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.drill.exec.physical.base;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import org.apache.drill.exec.physical.EndpointAffinity;
import org.apache.drill.exec.physical.PhysicalOperatorSetupException;
import org.apache.drill.exec.planner.fragment.ParallelizationInfo;
import org.apache.drill.exec.proto.CoordinationProtos.DrillbitEndpoint;
import org.apache.drill.shaded.guava.com.google.common.base.Preconditions;
import org.apache.drill.shaded.guava.com.google.common.collect.ImmutableList;
import org.apache.drill.shaded.guava.com.google.common.collect.Maps;
public abstract class AbstractExchange extends AbstractSingle implements Exchange {
// Ephemeral info for generating execution fragments.
protected int senderMajorFragmentId;
protected int receiverMajorFragmentId;
protected List<DrillbitEndpoint> senderLocations;
protected List<DrillbitEndpoint> receiverLocations;
public AbstractExchange(PhysicalOperator child) {
super(child);
}
/**
* Exchanges are not executable. The Execution layer first has to set their parallelization and convert them into
* something executable
*/
@Override
public boolean isExecutable() {
return false;
}
/**
* Default sender parallelization width range is [1, Integer.MAX_VALUE] and no endpoint affinity
* @param receiverFragmentEndpoints Endpoints assigned to receiver fragment if available, otherwise an empty list.
* @return Sender {@link org.apache.drill.exec.planner.fragment.ParallelizationInfo}.
*/
@Override
public ParallelizationInfo getSenderParallelizationInfo(List<DrillbitEndpoint> receiverFragmentEndpoints) {
return ParallelizationInfo.UNLIMITED_WIDTH_NO_ENDPOINT_AFFINITY;
}
/**
* Default receiver parallelization width range is [1, Integer.MAX_VALUE] and affinity to nodes where sender
* fragments are running.
* @param senderFragmentEndpoints Endpoints assigned to receiver fragment if available, otherwise an empty list.
* @return Receiver {@link org.apache.drill.exec.planner.fragment.ParallelizationInfo}.
*/
@Override
public ParallelizationInfo getReceiverParallelizationInfo(List<DrillbitEndpoint> senderFragmentEndpoints) {
Preconditions.checkArgument(senderFragmentEndpoints != null && senderFragmentEndpoints.size() > 0,
"Sender fragment endpoint list should not be empty");
return ParallelizationInfo.create(1, Integer.MAX_VALUE, getDefaultAffinityMap(senderFragmentEndpoints));
}
/**
* Get a default endpoint affinity map where affinity of a Drillbit is proportional to the number of its occurrences
* in given endpoint list.
*
* @param fragmentEndpoints Drillbit endpoint assignments of fragments.
* @return List of EndpointAffinity objects for each Drillbit endpoint given <i>fragmentEndpoints</i>.
*/
protected static List<EndpointAffinity> getDefaultAffinityMap(List<DrillbitEndpoint> fragmentEndpoints) {
Map<DrillbitEndpoint, EndpointAffinity> affinityMap = Maps.newHashMap();
final double affinityPerOccurrence = 1.0d / fragmentEndpoints.size();
for(DrillbitEndpoint sender : fragmentEndpoints) {
if (affinityMap.containsKey(sender)) {
affinityMap.get(sender).addAffinity(affinityPerOccurrence);
} else {
affinityMap.put(sender, new EndpointAffinity(sender, affinityPerOccurrence));
}
}
return new ArrayList<>(affinityMap.values());
}
protected void setupSenders(List<DrillbitEndpoint> senderLocations) throws PhysicalOperatorSetupException {
this.senderLocations = ImmutableList.copyOf(senderLocations);
}
protected void setupReceivers(List<DrillbitEndpoint> receiverLocations) throws PhysicalOperatorSetupException {
this.receiverLocations = ImmutableList.copyOf(receiverLocations);
}
@Override
public final void setupSenders(int majorFragmentId, List<DrillbitEndpoint> senderLocations) throws PhysicalOperatorSetupException {
this.senderMajorFragmentId = majorFragmentId;
setupSenders(senderLocations);
}
@Override
public final void setupReceivers(int majorFragmentId, List<DrillbitEndpoint> receiverLocations) throws PhysicalOperatorSetupException {
this.receiverMajorFragmentId = majorFragmentId;
setupReceivers(receiverLocations);
}
@Override
public final <T, X, E extends Throwable> T accept(PhysicalVisitor<T, X, E> physicalVisitor, X value) throws E {
return physicalVisitor.visitExchange(this, value);
}
@Override
public int getOperatorType() {
throw new UnsupportedOperationException();
}
@Override
public ParallelizationDependency getParallelizationDependency() {
return ParallelizationDependency.RECEIVER_DEPENDS_ON_SENDER;
}
}
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