Is it possible to add or delete Column Families in a working group?

Yes, it is possible to add or delete Column Families in a working group but before doing it, there has some precaution or procedure that the client has to follow. These precautions are: -

• Very first, users must assure that the commit log is clear and it can be done by 'node tool drain'.
• No data should be left in the commit log. For this Cassandra has to be turned off.
• Lastly, it is vital to delete the SS Table files for the raised CFs.