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From Ian Rogers <>
Subject atomic test-or-set
Date Tue, 05 Oct 2010 15:23:26 GMT

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?



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