Don't bootstrap nodes simultaneously unless you really know what you're doing, and you're using single tokens. It's not straightforward and will likely lead to data loss/inconsistencies. This applies for all current versions.

On 27 June 2018 at 10:21, dayu <> wrote:
    I have read a warning of not Simultaneously bootstrapping more than one new node from the same rack in version 2.1  link
    My cassandra cluster version is 3.0.10.
    So I wonder to know Is it ok to add more than one node to a exist cluster in 3.0.10.