@Override
    public MasterEntry getMasterNode(BaseReq req) {
        if (req.getClusterId() == null) {
            return null;
        }
        return masterRepository.findMasterEntryByClusterIdEquals(
                req.getClusterId());
    }
query master to get node info

@param url
@return query info
inlong-tubemq/tubemq-manager/src/main/java/org/apache/inlong/tubemq/manager/service/MasterServiceImpl.java