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Configure GraphFrames connected-components algorithm #1405

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5 changes: 4 additions & 1 deletion spark/core/src/main/java/zingg/spark/core/util/SparkGraphUtil.java
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,8 @@

public class SparkGraphUtil implements GraphUtil<Dataset<Row>, Row, Column> {

public static final String CONNECTED_COMPONENTS_ALGORITHM = "two_phase";

public ZFrame<Dataset<Row>, Row, Column> buildGraph(ZFrame<Dataset<Row>, Row, Column> vOrig, ZFrame<Dataset<Row>, Row, Column> ed) {
// we need to transform the input here by using stop words
//rename id field which is a common field in data to another field as it
Expand All @@ -37,7 +39,8 @@ public ZFrame<Dataset<Row>, Row, Column> buildGraph(ZFrame<Dataset<Row>, Row, Co
GraphFrame gf = new GraphFrame(v, e);
//gf = gf.dropIsolatedVertices();
//Dataset<Row> returnGraph = gf.connectedComponents().setAlgorithm("graphx").run().cache();
Dataset<Row> returnGraph = gf.connectedComponents().run().cache();
Dataset<Row> returnGraph = gf.connectedComponents()
.setAlgorithm(CONNECTED_COMPONENTS_ALGORITHM).run().cache();
//reverse back o avoid graphframes id :-()
returnGraph = returnGraph.join(vertices, returnGraph.col("id").equalTo(vertices.col(ColName.ID_COL)));
returnGraph = returnGraph.drop(ColName.ID_COL).withColumnRenamed("id", ColName.ID_COL);
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13 changes: 13 additions & 0 deletions spark/core/src/test/java/zingg/spark/core/util/TestSparkGraphUtilConfiguration.java
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@@ -0,0 +1,13 @@
package zingg.spark.core.util;

import static org.junit.jupiter.api.Assertions.assertEquals;

import org.junit.jupiter.api.Test;

public class TestSparkGraphUtilConfiguration {

@Test
public void connectedComponentsAlgorithmIsExplicitlyConfigured() {
assertEquals("two_phase", SparkGraphUtil.CONNECTED_COMPONENTS_ALGORITHM);
}
}