@Override
  public void validate(URI uri) throws IOException {
    if (StringUtils.isBlank(uri.getAuthority())) {
      throw new IOException("no bootstrap nodes specified, uri: " + uri);
    }
    // TODO: add more check about the bootstrap nodes
  }
Connection registry creator implementation for creating {@link RpcConnectionRegistry}.
hbase-client/src/main/java/org/apache/hadoop/hbase/client/RpcConnectionRegistryURIFactory.java