helix-core/src/main/java/org/apache/helix/controller/rebalancer/strategy/AutoRebalanceStrategy.java [316:340]:
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    Map<String, List<String>> newPreferences = new TreeMap<String, List<String>>();
    for (String partition : _partitions) {
      znRecord.setMapField(partition, new TreeMap<String, String>());
      znRecord.setListField(partition, new ArrayList<String>());
      newPreferences.put(partition, new ArrayList<String>());
    }

    // for preference lists, the rough priority that we want is:
    // [existing preferred, existing non-preferred, non-existing preferred, non-existing
    // non-preferred]
    for (Node node : _liveNodesList) {
      for (Replica replica : node.preferred) {
        if (node.newReplicas.contains(replica)) {
          newPreferences.get(replica.partition).add(node.id);
        } else {
          znRecord.getListField(replica.partition).add(node.id);
        }
      }
    }
    for (Node node : _liveNodesList) {
      for (Replica replica : node.nonPreferred) {
        if (node.newReplicas.contains(replica)) {
          newPreferences.get(replica.partition).add(node.id);
        } else {
          znRecord.getListField(replica.partition).add(node.id);
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helix-core/src/main/java/org/apache/helix/controller/strategy/AutoRebalanceStrategy.java [283:307]:
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    Map<String, List<String>> newPreferences = new TreeMap<String, List<String>>();
    for (String partition : _partitions) {
      znRecord.setMapField(partition, new TreeMap<String, String>());
      znRecord.setListField(partition, new ArrayList<String>());
      newPreferences.put(partition, new ArrayList<String>());
    }

    // for preference lists, the rough priority that we want is:
    // [existing preferred, existing non-preferred, non-existing preferred, non-existing
    // non-preferred]
    for (Node node : _liveNodesList) {
      for (Replica replica : node.preferred) {
        if (node.newReplicas.contains(replica)) {
          newPreferences.get(replica.partition).add(node.id);
        } else {
          znRecord.getListField(replica.partition).add(node.id);
        }
      }
    }
    for (Node node : _liveNodesList) {
      for (Replica replica : node.nonPreferred) {
        if (node.newReplicas.contains(replica)) {
          newPreferences.get(replica.partition).add(node.id);
        } else {
          znRecord.getListField(replica.partition).add(node.id);
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