Github user fanzhidongyzby commented on a diff in the pull request: https://github.com/apache/flink/pull/3788#discussion_r113848435 --- Diff: flink-libraries/flink-gelly/src/main/java/org/apache/flink/graph/generator/EvenlyGraph.java --- @@ -0,0 +1,145 @@ +/* + * 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.generator; + +import org.apache.flink.api.common.functions.FlatMapFunction; +import org.apache.flink.api.java.DataSet; +import org.apache.flink.api.java.ExecutionEnvironment; +import org.apache.flink.api.java.functions.FunctionAnnotation.ForwardedFields; +import org.apache.flink.graph.Edge; +import org.apache.flink.graph.Graph; +import org.apache.flink.graph.Vertex; +import org.apache.flink.types.LongValue; +import org.apache.flink.types.NullValue; +import org.apache.flink.util.Collector; +import org.apache.flink.util.LongValueSequenceIterator; +import org.apache.flink.util.Preconditions; + +/** + * Evenly graph means every {@link Vertex} in the {@link Graph} has the same degree. + * when vertex degree is 0, {@link EmptyGraph} will be generated. + * when vertex degree is vertex count - 1, {@link CompleteGraph} will be generated. --- End diff -- "vertex count - 1" means the degree of every vertex when evenly graph is complete graph, is this clear?
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