hosts.add("host2");
hosts.add("host3");
hosts.add("host4");
Configuration conf = new Configuration();
RetryListOfCollectors rloc = new RetryListOfCollectors(hosts, conf);
rloc.shuffleList();
assertEquals(hosts.size(), rloc.total());
for (int i = 0; i < hosts.size(); ++i) {
assertTrue(rloc.hasNext());
String s = rloc.next();