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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-1514) [Gelly] Add a Gather-Sum-Apply iteration method
Date Tue, 24 Feb 2015 14:30:04 GMT

    [ https://issues.apache.org/jira/browse/FLINK-1514?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14334921#comment-14334921
] 

ASF GitHub Bot commented on FLINK-1514:
---------------------------------------

Github user balidani commented on a diff in the pull request:

    https://github.com/apache/flink/pull/408#discussion_r25255250
  
    --- Diff: flink-staging/flink-gelly/src/main/java/org/apache/flink/graph/example/GSASingleSourceShortestPathsExample.java
---
    @@ -0,0 +1,232 @@
    +/*
    + * 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.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.api.java.tuple.Tuple3;
    +import org.apache.flink.graph.Edge;
    +import org.apache.flink.graph.Graph;
    +import org.apache.flink.graph.GraphAlgorithm;
    +import org.apache.flink.graph.Vertex;
    +import org.apache.flink.graph.example.utils.ExampleUtils;
    +import org.apache.flink.graph.gsa.ApplyFunction;
    +import org.apache.flink.graph.gsa.GatherFunction;
    +import org.apache.flink.graph.gsa.GatherSumApplyIteration;
    +import org.apache.flink.graph.gsa.SumFunction;
    +import org.apache.flink.util.Collector;
    +
    +import java.io.Serializable;
    +
    +/**
    + * This is an implementation of the Single Source Shortest Paths algorithm, using a gather-sum-apply
iteration
    + */
    +public class GSASingleSourceShortestPathsExample implements ProgramDescription, GraphAlgorithm<Long,
Double, Double> {
    --- End diff --
    
    Makes sense, I was blindly copying this part and didn't realize it's not really needed
:)


> [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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