Upgrading from 3.11.x to 4.1.x is supported, yes. As the documentation you 
reference mentions, it is not possible to downgrade from 4.x to 3.x.

Note that running repair during upgrades is not supported; please ensure it is 
disabled before beginning the upgrade and re-enable after.

– Scott

> On Jan 6, 2024, at 10:25 PM, manish khandelwal <manishkhandelwa...@gmail.com> 
> wrote:
> Hi 
> Is Cassandra upgrade from Cassandra 3.11.x to Cassandra 4.1.3 is supported. 
> NEWS.txt has a general guideline that 
> Snapshotting is fast (especially if you have JNA installed) and takes
> effectively zero disk space until you start compacting the live data
> files again.  Thus, best practice is to ALWAYS snapshot before any
> upgrade, just in case you need to roll back to the previous version.
> (Cassandra version X + 1 will always be able to read data files created
> by version X, but the inverse is not necessarily the case.)
> Based on the above I think it should be supported.
> REgards
> Manish

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