public List<ServerLocation> getRedundants() {
    List<ServerLocation> result = Collections.emptyList();
    if (queueManager != null) {
      QueueManager.QueueConnections cons = queueManager.getAllConnections();
      List<Connection> backupCons = cons.getBackups();
      if (backupCons.size() > 0) {
        result = new ArrayList<>(backupCons.size());
        for (Connection con : backupCons) {
          result.add(con.getServer());
        }
      }
    }
    return result;
  }
Test hook that returns a list of ServerLocation instances. Each ServerLocation describes a
redundant server. An empty list is returned if we have no redundant servers.
geode-core/src/main/java/org/apache/geode/cache/client/internal/PoolImpl.java