@gen.coroutine<EOL><INDENT>@query_params()<EOL>def ping(self, params=None):<DEDENT>
try:<EOL><INDENT>self.transport.perform_request('<STR_LIT>', '<STR_LIT:/>', params=params)<EOL><DEDENT>except TransportError:<EOL><INDENT>raise gen.Return(False)<EOL><DEDENT>raise gen.Return(True)<EOL>
Returns True if the cluster is up, False otherwise.