public List<UUID> getClusterIds() {
List<UUID> clusterIds = new ArrayList<UUID>();
byte[] bytes = getAttribute(CONSUMED_CLUSTER_IDS);
if(bytes != null) {
ByteArrayDataInput in = ByteStreams.newDataInput(bytes);
int numClusters = in.readInt();
for(int i=0; i<numClusters; i++){
clusterIds.add(new UUID(in.readLong(), in.readLong()));
}
}
return clusterIds;