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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.jobgraph;
import org.apache.flink.runtime.io.network.api.writer.SubtaskStateMapper;
import static org.apache.flink.util.Preconditions.checkNotNull;
/**
* This class represent edges (communication channels) in a job graph. The edges always go from an
* intermediate result partition to a job vertex. An edge is parametrized with its {@link
* DistributionPattern}.
*/
public class JobEdge implements java.io.Serializable {
private static final long serialVersionUID = 1L;
/** The vertex connected to this edge. */
private final JobVertex target;
/** The distribution pattern that should be used for this job edge. */
private final DistributionPattern distributionPattern;
/** The channel rescaler that should be used for this job edge on downstream side. */
private SubtaskStateMapper downstreamSubtaskStateMapper = SubtaskStateMapper.ROUND_ROBIN;
/** The channel rescaler that should be used for this job edge on upstream side. */
private SubtaskStateMapper upstreamSubtaskStateMapper = SubtaskStateMapper.ROUND_ROBIN;
/** The data set at the source of the edge, may be null if the edge is not yet connected */
private IntermediateDataSet source;
/** The id of the source intermediate data set */
private IntermediateDataSetID sourceId;
/**
* Optional name for the data shipping strategy (forward, partition hash, rebalance, ...), to be
* displayed in the JSON plan
*/
private String shipStrategyName;
/**
* Optional name for the pre-processing operation (sort, combining sort, ...), to be displayed
* in the JSON plan
*/
private String preProcessingOperationName;
/** Optional description of the caching inside an operator, to be displayed in the JSON plan */
private String operatorLevelCachingDescription;
/**
* Constructs a new job edge, that connects an intermediate result to a consumer task.
*
* @param source The data set that is at the source of this edge.
* @param target The operation that is at the target of this edge.
* @param distributionPattern The pattern that defines how the connection behaves in parallel.
*/
public JobEdge(
IntermediateDataSet source, JobVertex target, DistributionPattern distributionPattern) {
if (source == null || target == null || distributionPattern == null) {
throw new NullPointerException();
}
this.target = target;
this.distributionPattern = distributionPattern;
this.source = source;
this.sourceId = source.getId();
}
/**
* Constructs a new job edge that refers to an intermediate result via the Id, rather than
* directly through the intermediate data set structure.
*
* @param sourceId The id of the data set that is at the source of this edge.
* @param target The operation that is at the target of this edge.
* @param distributionPattern The pattern that defines how the connection behaves in parallel.
*/
public JobEdge(
IntermediateDataSetID sourceId,
JobVertex target,
DistributionPattern distributionPattern) {
if (sourceId == null || target == null || distributionPattern == null) {
throw new NullPointerException();
}
this.target = target;
this.distributionPattern = distributionPattern;
this.sourceId = sourceId;
}
/**
* Returns the data set at the source of the edge. May be null, if the edge refers to the source
* via an ID and has not been connected.
*
* @return The data set at the source of the edge
*/
public IntermediateDataSet getSource() {
return source;
}
/**
* Returns the vertex connected to this edge.
*
* @return The vertex connected to this edge.
*/
public JobVertex getTarget() {
return target;
}
/**
* Returns the distribution pattern used for this edge.
*
* @return The distribution pattern used for this edge.
*/
public DistributionPattern getDistributionPattern() {
return this.distributionPattern;
}
/**
* Gets the ID of the consumed data set.
*
* @return The ID of the consumed data set.
*/
public IntermediateDataSetID getSourceId() {
return sourceId;
}
public boolean isIdReference() {
return this.source == null;
}
// --------------------------------------------------------------------------------------------
public void connecDataSet(IntermediateDataSet dataSet) {
if (dataSet == null) {
throw new NullPointerException();
}
if (this.source != null) {
throw new IllegalStateException("The edge is already connected.");
}
if (!dataSet.getId().equals(sourceId)) {
throw new IllegalArgumentException(
"The data set to connect does not match the sourceId.");
}
this.source = dataSet;
}
// --------------------------------------------------------------------------------------------
/**
* Gets the name of the ship strategy for the represented input, like "forward", "partition
* hash", "rebalance", "broadcast", ...
*
* @return The name of the ship strategy for the represented input, or null, if none was set.
*/
public String getShipStrategyName() {
return shipStrategyName;
}
/**
* Sets the name of the ship strategy for the represented input.
*
* @param shipStrategyName The name of the ship strategy.
*/
public void setShipStrategyName(String shipStrategyName) {
this.shipStrategyName = shipStrategyName;
}
/**
* Gets the channel state rescaler used for rescaling persisted data on downstream side of this
* JobEdge.
*
* @return The channel state rescaler to use, or null, if none was set.
*/
public SubtaskStateMapper getDownstreamSubtaskStateMapper() {
return downstreamSubtaskStateMapper;
}
/**
* Sets the channel state rescaler used for rescaling persisted data on downstream side of this
* JobEdge.
*
* @param downstreamSubtaskStateMapper The channel state rescaler selector to use.
*/
public void setDownstreamSubtaskStateMapper(SubtaskStateMapper downstreamSubtaskStateMapper) {
this.downstreamSubtaskStateMapper = checkNotNull(downstreamSubtaskStateMapper);
}
/**
* Gets the channel state rescaler used for rescaling persisted data on upstream side of this
* JobEdge.
*
* @return The channel state rescaler to use, or null, if none was set.
*/
public SubtaskStateMapper getUpstreamSubtaskStateMapper() {
return upstreamSubtaskStateMapper;
}
/**
* Sets the channel state rescaler used for rescaling persisted data on upstream side of this
* JobEdge.
*
* @param upstreamSubtaskStateMapper The channel state rescaler selector to use.
*/
public void setUpstreamSubtaskStateMapper(SubtaskStateMapper upstreamSubtaskStateMapper) {
this.upstreamSubtaskStateMapper = checkNotNull(upstreamSubtaskStateMapper);
}
/**
* Gets the name of the pro-processing operation for this input.
*
* @return The name of the pro-processing operation, or null, if none was set.
*/
public String getPreProcessingOperationName() {
return preProcessingOperationName;
}
/**
* Sets the name of the pre-processing operation for this input.
*
* @param preProcessingOperationName The name of the pre-processing operation.
*/
public void setPreProcessingOperationName(String preProcessingOperationName) {
this.preProcessingOperationName = preProcessingOperationName;
}
/**
* Gets the operator-level caching description for this input.
*
* @return The description of operator-level caching, or null, is none was set.
*/
public String getOperatorLevelCachingDescription() {
return operatorLevelCachingDescription;
}
/**
* Sets the operator-level caching description for this input.
*
* @param operatorLevelCachingDescription The description of operator-level caching.
*/
public void setOperatorLevelCachingDescription(String operatorLevelCachingDescription) {
this.operatorLevelCachingDescription = operatorLevelCachingDescription;
}
// --------------------------------------------------------------------------------------------
@Override
public String toString() {
return String.format("%s --> %s [%s]", sourceId, target, distributionPattern.name());
}
}
