hugegraph-example/src/main/java/org/apache/hugegraph/example/PerfExample1.java [105:138]:
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                softwareIds.add(vertex.id());
                LOG.debug("Add software: {}", vertex);
            }

            LOG.debug("========== random knows & created edges ==========");
            for (int i = 0; i < EDGE_NUM / 2 * multiple; i++) {
                Random random = new Random();

                // Add edge: person --knows-> person
                Object p1 = personIds.get(random.nextInt(PERSON_NUM));
                Object p2 = personIds.get(random.nextInt(PERSON_NUM));
                graph.getVertex(p1).addEdge("knows", graph.getVertex(p2));

                // Add edge: person --created-> software
                Object p3 = personIds.get(random.nextInt(PERSON_NUM));
                Object s1 = softwareIds.get(random.nextInt(SOFTWARE_NUM));
                graph.getVertex(p3).addEdge("created", graph.getVertex(s1));
            }

            try {
                graph.tx().commit();
            } catch (BackendException e) {
                if (e.getCause() instanceof NoHostAvailableException) {
                    LOG.warn("Failed to commit tx: {}", e.getMessage());
                } else {
                    throw e;
                }
            }

            this.vertices.addAll(personIds);
            this.vertices.addAll(softwareIds);

            personIds.clear();
            softwareIds.clear();
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hugegraph-example/src/main/java/org/apache/hugegraph/example/PerfExample2.java [88:121]:
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                softwareIds.add(vertex.id());
                LOG.debug("Add software: {}", vertex);
            }

            LOG.debug("========== random knows & created edges ==========");
            for (int i = 0; i < EDGE_NUM / 2 * multiple; i++) {
                Random random = new Random();

                // Add edge: person --knows-> person
                Object p1 = personIds.get(random.nextInt(PERSON_NUM));
                Object p2 = personIds.get(random.nextInt(PERSON_NUM));
                graph.getVertex(p1).addEdge("knows", graph.getVertex(p2));

                // Add edge: person --created-> software
                Object p3 = personIds.get(random.nextInt(PERSON_NUM));
                Object s1 = softwareIds.get(random.nextInt(SOFTWARE_NUM));
                graph.getVertex(p3).addEdge("created", graph.getVertex(s1));
            }

            try {
                graph.tx().commit();
            } catch (BackendException e) {
                if (e.getCause() instanceof NoHostAvailableException) {
                    LOG.warn("Failed to commit tx: {}", e.getMessage());
                } else {
                    throw e;
                }
            }

            this.vertices.addAll(personIds);
            this.vertices.addAll(softwareIds);

            personIds.clear();
            softwareIds.clear();
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