default void postAuthorizeConnection(ObserverContext<RpcCoprocessorEnvironment> ctx,
    String userName, X509Certificate[] clientCertificateChain) throws IOException {
  }
Called after successfully authorizing connection
@param ctx                    the coprocessor instance's environment
@param userName               the user name
@param clientCertificateChain list of peer certificates from SSL connection
hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/RpcObserver.java