If the delegation token is expired, the server has a background thread to remove expired Delegation Tokens from the server’s token store. Only the renewer of the Delegation Token can renew it, before it expires.   You may refer the below blog for understanding delegation tokes and its associated parameters: Hadoop delegation tokens explained  ... View more

Kindly check on the below: SUPERSET_TIMEOUT should be greater or equal to SQLLAB_TIMEOUT.   The properties need to be set to increase the timeout of visualizations: For synchronous queries -  SUPERSET_WEBSERVER_TIMEOUT  SQLLAB_TIMEOUT    For async queries - SQLLAB_ASYNC_TIME_LIMIT_SEC  ... View more