@sankar rao You may want to visit these links as they are documented about the use of different Authorizations. Hive Authorization Storage Based Authorization in the Metastore Server ... View more

@sankar rao In case that you did not do it already, enable Ambari metrics for services of interest and see what they show. Also, check the logs for services running slow. Quite often they may show errors related to JVM settings etc. ... View more