private List initFrontends()

in spark-doris-connector/spark-doris-connector-base/src/main/java/org/apache/doris/spark/client/DorisFrontendClient.java [96:147]
52 lines of code
12 McCabe index (conditional complexity)

    private List<Frontend> initFrontends(DorisConfig config) throws Exception {
        String frontendNodes = config.getValue(DorisOptions.DORIS_FENODES);
        String[] frontendNodeArray = frontendNodes.split(",");
        if (config.getValue(DorisOptions.DORIS_FE_AUTO_FETCH)) {
            Exception ex = null;
            List<Frontend> frontendList = null;
            for (String frontendNode : frontendNodeArray) {
                String[] nodeDetails = frontendNode.split(":");
                try {
                    List<Frontend> list = Collections.singletonList(new Frontend(nodeDetails[0],
                            nodeDetails.length > 1 ? Integer.parseInt(nodeDetails[1]) : -1));
                    frontendList = requestFrontends(list, (frontend, client) -> {
                        String url = URLs.getFrontEndNodes(frontend.getHost(), frontend.getHttpPort(),
                                isHttpsEnabled);
                        HttpGet httpGet = new HttpGet(url);
                        HttpUtils.setAuth(httpGet, username, password);
                        JsonNode dataNode;
                        try {
                            HttpResponse response = client.execute(httpGet);
                            dataNode = extractDataFromResponse(response, url);
                        } catch (IOException e) {
                            throw new RuntimeException("fetch fe failed", e);
                        }
                        ArrayNode columnNames = (ArrayNode) dataNode.get("columnNames");
                        ArrayNode rows = (ArrayNode) dataNode.get("rows");
                        return parseFrontends(columnNames, rows);
                    });
                } catch (Exception e) {
                    LOG.warn("fetch fe request on {} failed, err: {}", frontendNode, e.getMessage());
                    ex = e;
                }
            }
            if (frontendList == null || frontendList.isEmpty()) {
                if (ex == null) {
                    throw new DorisException("frontend init fetch failed, empty frontend list");
                }
                throw new DorisException("frontend init fetch failed", ex);
            }
            return frontendList;
        } else {
            int queryPort = config.contains(DorisOptions.DORIS_QUERY_PORT) ?
                    config.getValue(DorisOptions.DORIS_QUERY_PORT) : -1;
            int flightSqlPort = config.contains(DorisOptions.DORIS_READ_FLIGHT_SQL_PORT) ?
                    config.getValue(DorisOptions.DORIS_READ_FLIGHT_SQL_PORT) : -1;
            return Arrays.stream(frontendNodeArray)
                    .map(node -> {
                        String[] nodeParts = node.split(":");
                        return new Frontend(nodeParts[0], nodeParts.length > 1 ? Integer.parseInt(nodeParts[1]) : -1, queryPort, flightSqlPort);
                    })
                    .collect(Collectors.toList());
        }
    }