@Override
  public InetSocketAddress getSocketAddr(String hostProperty, String addressProperty,
    String defaultAddressValue, int defaultPort) {
    return conf.getSocketAddr(hostProperty, addressProperty, defaultAddressValue, defaultPort);
  }
Wraps a Configuration to make it read-only.
hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/ReadOnlyConfiguration.java