lib/em-hiredis/base_client.rb
def reconnect!(new_uri = nil)
      @connection.close_connection
      configure(new_uri) if new_uri
      @auto_reconnect = true
      EM.next_tick { reconnect_connection }
    end
def reconnect!(new_uri = nil)
      @connection.close_connection
      configure(new_uri) if new_uri
      @auto_reconnect = true
      EM.next_tick { reconnect_connection }
    end
Disconnect then reconnect the redis connection.

 Pass optional uri - e.g. to connect to a different redis server.
 Any pending redis commands will be failed, but during the reconnection
 new commands will be queued and sent after connected.