public static boolean isFavoredNodeApplicable(RegionInfo regionInfo) {
    return !regionInfo.getTable().isSystemTable();
  }
Favored nodes are not applicable for system tables. We will use this to check before we apply
any favored nodes logic on a region.
hbase-balancer/src/main/java/org/apache/hadoop/hbase/favored/FavoredNodesManager.java