Secondary indexes for multi-value fields

[Prasad Sunkari]

Hi all,
I have a column family for users of my system and I need to have tags 
set to these users.  My current plan is to have a column that holds a 
string (comma separated tags).

I am not clear if this the best way to do it.  Specially because this 
may lead to a complications when more than one administrator is trying 
to tag the same user (lost updates) as well as the secondary indexes (if 
I wanted to use the built in secondary indexes).  I also am not sure if 
it is possible to have a secondary index on a multi-valued column!

Another alternative is to have it in a super column with each tag being 
a column by itself and let my application take care of the secondary 
indexes.

I am currently of the opinion that the second solution is the only thing 
that I could do.
Any suggestions?  Since this is my first app on Cassandra I am trying to 
see if my opinion is correct.

Thanks,
Prasad