I have found this interesting article regarding Hortonworks Hadoop Hive.
For now I have moved your thread to the correct category, where you might have more visibility for your questions
Lénaïc RIÉDINGER, Global Community Engineer Tableau
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When you say multiple service accounts do you mean multiple run as users?
The Tableau Server run as user can only be configured once. Though the connections could be established with different credentials (the different service account) the data sources could all be hosted on the Tableau Server with the different accounts signed in.
Please check out the below documentation:
Planning Your Tableau Server Deployment - Check section on 'Run As User', and section 'Data source authentication and the Run As User account'