Any best practices for hive upgrade from 1.2.1 to 3.1.2

[Battula, Brahma Reddy]

Hi All,

We are planning to upgrade the hive from 1.2.1 to 3.1.2, can we get any best 
practices ..?

Is any chance to upgrade without down time (if we disable new features like 
managed tables)..?


Thanks.