private void verifyDuplicatedRegion() {
		Map<String, RegionInfo> regions = getAll();
		String localRegion = getCurrent();
		RegionInfo regionInfo = regions.get(localRegion);
		if (regionInfo != null && !StringUtils.equals(regionInfo.getIp(), config.getClusterProperties().getProperty
			(ClusterConstants.PROP_CLUSTER_HOST, NetworkUtils.getLocalHostAddress()))) {
			throw processException("The region name, " + localRegion
				+ ", is already used by other controller " + regionInfo.getIp()
				+ ". Please set the different region name in this controller.");
		}
	}
Verify duplicate region when starting with cluster mode.

@since 3.2
ngrinder-controller/src/main/java/org/ngrinder/region/service/RegionService.java