Does Cassandra have an atomic test-or-set operation?
That is, I want to check to see if a key has a value and, if not, set it to something. But it must be an atomic operation - I can't do a separate fetch and then set from the application as that creates a possible race condition with another application.
Equivalent to the SQL "update foo set grum = 'bang' where isnull(grum) ..." Any thoughts how to do this? Cheers, Ian
