📌Today Microsoft released the SQL Server 2019 RC1 for big data clusters!https://cloudblogs.microsoft.com/sqlserver/2019/08/29/sql-server-2019-release-candidate-refresh-with-big-data-clusters/
You can get more details on what's new in the following document:
https://docs.microsoft.com/en-us/sql/big-data-cluster/release-notes-big-data-cluster?view=sqlallproducts-allversions#rc
You can learn more about how to deploy SQL Server with High Availability here:
https://docs.microsoft.com/en-us/sql/big-data-cluster/deployment-high-availability?view=sqlallproducts-allversions