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https://issues.apache.org/jira/browse/FLINK-1514?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14501466#comment-14501466
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ASF GitHub Bot commented on FLINK-1514:
---------------------------------------
Github user vasia commented on a diff in the pull request:
https://github.com/apache/flink/pull/408#discussion_r28645507
--- Diff:
flink-staging/flink-gelly/src/main/java/org/apache/flink/graph/example/GSAConnectedComponentsExample.java
---
@@ -0,0 +1,190 @@
+/*
+ * 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.graph.example;
+
+import org.apache.flink.api.common.ProgramDescription;
+import org.apache.flink.api.common.functions.FlatMapFunction;
+import org.apache.flink.api.common.functions.MapFunction;
+import org.apache.flink.api.java.DataSet;
+import org.apache.flink.api.java.ExecutionEnvironment;
+import org.apache.flink.api.java.tuple.Tuple2;
+import org.apache.flink.graph.Edge;
+import org.apache.flink.graph.Graph;
+import org.apache.flink.graph.Vertex;
+import org.apache.flink.graph.gsa.ApplyFunction;
+import org.apache.flink.graph.gsa.GatherFunction;
+import org.apache.flink.graph.gsa.SumFunction;
+import org.apache.flink.graph.gsa.RichEdge;
+import org.apache.flink.types.NullValue;
+import org.apache.flink.util.Collector;
+
+/**
+ * This is an implementation of the Connected Components algorithm, using
a gather-sum-apply iteration
+ */
+public class GSAConnectedComponentsExample implements ProgramDescription {
+
+ //
--------------------------------------------------------------------------------------------
+ // Program
+ //
--------------------------------------------------------------------------------------------
+
+ public static void main(String[] args) throws Exception {
+
+ if (!parseParameters(args)) {
+ return;
+ }
+
+ ExecutionEnvironment env =
ExecutionEnvironment.getExecutionEnvironment();
+
+ DataSet<Edge<Long, NullValue>> edges = getEdgeDataSet(env);
+ DataSet<Vertex<Long, Long>> vertices = edges.flatMap(new
InitVerticesMapper()).distinct();
+
+ Graph<Long, Long, NullValue> graph =
Graph.fromDataSet(vertices, edges, env);
+
+ // Simply return the vertex value of each vertex
+ GatherFunction<Long, NullValue, Long> gather = new
ConnectedComponentsGather();
+
+ // Select the lower value among neighbors
+ SumFunction<Long, NullValue, Long> sum = new
ConnectedComponentsSum();
+
+ // Set the lower value for each vertex
+ ApplyFunction<Long, NullValue, Long> apply = new
ConnectedComponentsApply();
+
+ // Execute the GSA iteration
+ Graph<Long, Long, NullValue> result =
+ graph.runGatherSumApplyIteration(gather, sum,
apply, maxIterations);
+
+ // Extract the vertices as the result
+ DataSet<Vertex<Long, Long>> greedyGraphColoring =
result.getVertices();
--- End diff --
greedyGraphColoring?
> [Gelly] Add a Gather-Sum-Apply iteration method
> -----------------------------------------------
>
> Key: FLINK-1514
> URL: https://issues.apache.org/jira/browse/FLINK-1514
> Project: Flink
> Issue Type: New Feature
> Components: Gelly
> Affects Versions: 0.9
> Reporter: Vasia Kalavri
> Assignee: Daniel Bali
>
> This will be a method that implements the GAS computation model, but without
> the "scatter" step. The phases can be mapped into the following steps inside
> a delta iteration:
> gather: a map on each < srcVertex, edge, trgVertex > that produces a partial
> value
> sum: a reduce that combines the partial values
> apply: join with vertex set to update the vertex values using the results of
> sum and the previous state.
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