You're right, there is currently no way to do this since 1) insert can't have a IF currently and 2) update can't update such table.

We'll fix that: https://issues.apache.org/jira/browse/CASSANDRA-5715

--
Sylvain


On Sat, Jun 29, 2013 at 9:51 PM, Blair Zajac <blair@orcaware.com> wrote:
On 6/24/13 8:23 PM, Blair Zajac wrote:
How does one do an atomic update in a column family with a single column?

I have a this CF

CREATE TABLE schema_migrations (
version TEXT PRIMARY KEY,
) WITH COMPACTION = {'class': 'LeveledCompactionStrategy'};

Anyone?  Should I raise this on the developer mailing list or open a ticket?

Blair