final Section section = conf.get(name);
final String topic = name.substring("topic=".length());
final TopicConfig topicConfig = new TopicConfig(topic, this);
Set<String> validKeySet = topicConfig.getFieldSet();
Set<String> allKeySet = section.keySet();
Set<String> filterClassKeys = new HashSet<String>();
Set<String> configKeySet = new HashSet<String>();
for (String key : allKeySet) {
if (key.startsWith("group.")) {
filterClassKeys.add(key);