private TubeMQResult queryRegion(QueryRegionReq req) {
        if (ValidateUtils.isNull(req.getClusterId())) {
            return TubeMQResult.errorResult(TubeMQErrorConst.PARAM_ILLEGAL);
        }
        List<RegionEntry> regionEntries = regionService
                .queryRegion(req.getRegionId(), req.getClusterId());
        return TubeMQResult.successResult(regionEntries);
    }
query regions in cluster

@param req
@return
inlong-tubemq/tubemq-manager/src/main/java/org/apache/inlong/tubemq/manager/controller/region/RegionController.java