Jai, Thrift was deprecated years ago (maybe 5 or 6?) and COMPACT STORAGE was dropped since the refactor of the storage engine in C* 3.0 so there won't be support for any legacy CLI. In fact, you need to migrate off legacy storage when you upgrade using ALTER TABLE ks.table DROP COMPACT STORAGE.
You won't be able to upgrade to 3.x versions until your application has migrated off legacy drivers since they won't be supported. Out of curiosity, which driver is your application using? I highly doubt it would still be supported by someone since most development on Thrift clients ended years ago. For more info on DROP COMPACT STORAGE, see this KB article I wrote a couple of years ago -- https://support.datastax.com/hc/en-us/articles/360000943523. Cheers!
