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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-1520) Read edges and vertices from CSV files
Date Mon, 13 Jul 2015 20:03:05 GMT

    [ https://issues.apache.org/jira/browse/FLINK-1520?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14625246#comment-14625246
] 

ASF GitHub Bot commented on FLINK-1520:
---------------------------------------

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

    https://github.com/apache/flink/pull/847#discussion_r34504919
  
    --- Diff: flink-staging/flink-gelly/src/main/java/org/apache/flink/graph/GraphCsvReader.java
---
    @@ -0,0 +1,462 @@
    +/*
    + * 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;
    +import com.google.common.base.Preconditions;
    +import org.apache.flink.api.common.functions.MapFunction;
    +import org.apache.flink.api.java.DataSet;
    +import org.apache.flink.api.java.io.CsvReader;
    +import org.apache.flink.api.java.tuple.Tuple2;
    +import org.apache.flink.api.java.tuple.Tuple3;
    +import org.apache.flink.core.fs.Path;
    +import org.apache.flink.api.java.ExecutionEnvironment;
    +import org.apache.flink.types.NullValue;
    +/**
    + * A class to build a Graph using path(s) provided to CSV file(s) with edge (vertices)
data
    + * The class also configures the CSV readers used to read edges(vertices) data such as
the field types,
    + * the delimiters (row and field),  the fields that should be included or skipped, and
other flags
    + * such as whether to skip the initial line as the header.
    + * The configuration is done using the functions provided in The {@link org.apache.flink.api.java.io.CsvReader}
class.
    + */
    +@SuppressWarnings({"unused" , "unchecked"})
    +public class GraphCsvReader<K,VV,EV> {
    +
    +	private final Path vertexPath,edgePath;
    +	private final ExecutionEnvironment executionContext;
    +	protected CsvReader EdgeReader;
    +	protected CsvReader VertexReader;
    +	protected MapFunction<K, VV> mapper;
    +	protected Class<K> vertexKey;
    +	protected Class<VV> vertexValue;
    +	protected Class<EV> edgeValue;
    +
    +//--------------------------------------------------------------------------------------------------------------------
    +	public GraphCsvReader(Path vertexPath,Path edgePath, ExecutionEnvironment context) {
    +		this.vertexPath = vertexPath;
    +		this.edgePath = edgePath;
    +		this.VertexReader = new CsvReader(vertexPath,context);
    +		this.EdgeReader = new CsvReader(edgePath,context);
    +		this.mapper=null;
    +		this.executionContext=context;
    +	}
    +
    +	public GraphCsvReader(Path edgePath, ExecutionEnvironment context) {
    +		this.vertexPath = null;
    +		this.edgePath = edgePath;
    +		this.EdgeReader = new CsvReader(edgePath,context);
    +		this.VertexReader = null;
    +		this.mapper = null;
    +		this.executionContext=context;
    +	}
    +
    +	public GraphCsvReader(Path edgePath,final MapFunction<K, VV> mapper, ExecutionEnvironment
context) {
    +		this.vertexPath = null;
    +		this.edgePath = edgePath;
    +		this.EdgeReader = new CsvReader(edgePath,context);
    +		this.VertexReader = null;
    +		this.mapper = mapper;
    +		this.executionContext=context;
    +	}
    +
    +	public GraphCsvReader (String edgePath,ExecutionEnvironment context) {
    +		this(new Path(Preconditions.checkNotNull(edgePath, "The file path may not be null.")),
context);
    +
    +	}
    +
    +	public GraphCsvReader(String vertexPath, String edgePath, ExecutionEnvironment context)
{
    +		this(new Path(Preconditions.checkNotNull(vertexPath, "The file path may not be null.")),
    +				new Path(Preconditions.checkNotNull(edgePath, "The file path may not be null.")),
context);
    +	}
    +
    +
    +	public GraphCsvReader (String edgePath, final MapFunction<K, VV> mapper, ExecutionEnvironment
context) {
    +			this(new Path(Preconditions.checkNotNull(edgePath, "The file path may not be null.")),mapper,
context);
    +	}
    +
    +	//--------------------------------------------------------------------------------------------------------------------
    +	/**
    +	 * Specifies the types for the edges fields and returns this instance of GraphCsvReader
    +	 *
    +	 * @param vertexKey The type of Vetex ID in the Graph.
    +	 * @param  edgeValue The type of Edge Value in the returned Graph.
    +	 * @return The {@link org.apache.flink.graph.GraphCsvReader}
    +	 */
    +	public GraphCsvReader typesEdges(Class<K> vertexKey, Class<EV> edgeValue)
{
    +		this.vertexKey = vertexKey;
    +		this.edgeValue = edgeValue;
    +		return this;
    +	}
    +
    +	/**
    +	 * Specifies the types for the edges fields and returns this instance of GraphCsvReader
    +	 * This method is overloaded for the case when the type of EdgeValue is NullValue
    +	 * @param vertexKey The type of Vetex ID in the Graph.
    +	 * @return The {@link org.apache.flink.graph.GraphCsvReader}
    +	 */
    +	public GraphCsvReader typesEdges(Class<K> vertexKey) {
    +		this.vertexKey = vertexKey;
    +		this.edgeValue = null;
    +		return this;
    +	}
    +
    +	/**
    +	 * Specifies the types for the vertices fields and returns an instance of Graph
    +	 * @param vertexKey The type of Vertex ID in the Graph.
    +	 * @param vertexValue The type of Vertex Value in the Graph.
    +	 * @return The {@link org.apache.flink.graph.Graph}
    +	 */
    +	public Graph<K, VV, EV> typesVertices(Class vertexKey, Class vertexValue) {
    +		DataSet<Tuple3<K, K, EV>> edges = this.EdgeReader.types(this.vertexKey,this.vertexKey,
this.edgeValue);
    +		if(mapper == null && this.VertexReader != null) {
    +		DataSet<Tuple2<K, VV>> vertices = this.VertexReader.types(vertexKey, vertexValue);
    +		return Graph.fromTupleDataSet(vertices, edges, executionContext);
    +		} else if(this.mapper != null) {
    +		return Graph.fromTupleDataSet(edges, this.mapper, executionContext);
    +		} else {
    --- End diff --
    
    same around here...


> Read edges and vertices from CSV files
> --------------------------------------
>
>                 Key: FLINK-1520
>                 URL: https://issues.apache.org/jira/browse/FLINK-1520
>             Project: Flink
>          Issue Type: New Feature
>          Components: Gelly
>            Reporter: Vasia Kalavri
>            Assignee: Shivani Ghatge
>            Priority: Minor
>              Labels: easyfix, newbie
>
> Add methods to create Vertex and Edge Datasets directly from CSV file inputs.



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