for (Map.Entry<String, AWSClient> entry : regionToAwsClient.entrySet()) {
String region = entry.getKey();
AWSClient awsClient = entry.getValue();
Set<String> asgInstances = Sets.newHashSet();
LOGGER.info(String.format("Crawling clusters in region %s", region));
for (AutoScalingGroup asg : awsClient.describeAutoScalingGroups(clusterNames)) {
List<String> instances = Lists.newArrayList();
for (Instance instance : asg.getInstances()) {
instances.add(instance.getInstanceId());
asgInstances.add(instance.getInstanceId());
}