/***********************************************************************************************************************
* 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.test.recordJobs.graph;
import eu.stratosphere.api.common.Plan;
import eu.stratosphere.api.common.Program;
import eu.stratosphere.api.common.ProgramDescription;
import eu.stratosphere.api.java.record.operators.FileDataSink;
import eu.stratosphere.api.java.record.operators.FileDataSource;
import eu.stratosphere.api.java.record.operators.JoinOperator;
import eu.stratosphere.api.java.record.operators.MapOperator;
import eu.stratosphere.api.java.record.operators.ReduceOperator;
import eu.stratosphere.test.recordJobs.graph.ComputeEdgeDegrees.CountEdges;
import eu.stratosphere.test.recordJobs.graph.ComputeEdgeDegrees.JoinCountsAndUniquify;
import eu.stratosphere.test.recordJobs.graph.ComputeEdgeDegrees.ProjectEdge;
import eu.stratosphere.test.recordJobs.graph.EnumTrianglesOnEdgesWithDegrees.BuildTriads;
import eu.stratosphere.test.recordJobs.graph.EnumTrianglesOnEdgesWithDegrees.CloseTriads;
import eu.stratosphere.test.recordJobs.graph.EnumTrianglesOnEdgesWithDegrees.ProjectOutCounts;
import eu.stratosphere.test.recordJobs.graph.EnumTrianglesOnEdgesWithDegrees.ProjectToLowerDegreeVertex;
import eu.stratosphere.test.recordJobs.graph.triangleEnumUtil.EdgeInputFormat;
import eu.stratosphere.test.recordJobs.graph.triangleEnumUtil.TriangleOutputFormat;
import eu.stratosphere.types.IntValue;
/**
* An implementation of the triangle enumeration, which includes the pre-processing step
* to compute the degrees of the vertices and to select the lower-degree vertex for the
* enumeration of open triads.
*/
public class EnumTrianglesWithDegrees implements Program, ProgramDescription {
private static final long serialVersionUID = 1L;
@Override
public Plan getPlan(String... args) {
// parse job parameters
final int numSubTasks = (args.length > 0 ? Integer.parseInt(args[0]) : 1);
final String edgeInput = args.length > 1 ? args[1] : "";
final String output = args.length > 2 ? args[2] : "";
final char delimiter = args.length > 3 ? (char) Integer.parseInt(args[3]) : ',';
FileDataSource edges = new FileDataSource(new EdgeInputFormat(), edgeInput, "Input Edges");
edges.setParameter(EdgeInputFormat.ID_DELIMITER_CHAR, delimiter);
// =========================== Vertex Degree ============================
MapOperator projectEdge = MapOperator.builder(new ProjectEdge())
.input(edges).name("Project Edge").build();
ReduceOperator edgeCounter = ReduceOperator.builder(new CountEdges(), IntValue.class, 0)
.input(projectEdge).name("Count Edges for Vertex").build();
ReduceOperator countJoiner = ReduceOperator.builder(new JoinCountsAndUniquify(), IntValue.class, 0)
.keyField(IntValue.class, 1)
.input(edgeCounter).name("Join Counts").build();
// =========================== Triangle Enumeration ============================
MapOperator toLowerDegreeEdge = MapOperator.builder(new ProjectToLowerDegreeVertex())
.input(countJoiner).name("Select lower-degree Edge").build();
MapOperator projectOutCounts = MapOperator.builder(new ProjectOutCounts())
.input(countJoiner).name("Project out Counts").build();
ReduceOperator buildTriads = ReduceOperator.builder(new BuildTriads(), IntValue.class, 0)
.input(toLowerDegreeEdge).name("Build Triads").build();
JoinOperator closeTriads = JoinOperator.builder(new CloseTriads(), IntValue.class, 1, 0)
.keyField(IntValue.class, 2, 1)
.input1(buildTriads).input2(projectOutCounts)
.name("Close Triads").build();
closeTriads.setParameter("INPUT_SHIP_STRATEGY", "SHIP_REPARTITION_HASH");
closeTriads.setParameter("LOCAL_STRATEGY", "LOCAL_STRATEGY_HASH_BUILD_SECOND");
FileDataSink triangles = new FileDataSink(new TriangleOutputFormat(), output, closeTriads, "Triangles");
Plan p = new Plan(triangles, "Enumerate Triangles");
p.setDefaultParallelism(numSubTasks);
return p;
}
@Override
public String getDescription() {
return "Parameters: [noSubStasks] [input file] [output file]";
}
}