On Mon, Dec 4, 2017 at 4:13 AM, Peng Xiao <2535...@qq.com> wrote: > Dear All, > If we update a record which actually does not exist in Cassandra,will it > generate a new record or exit? > > UPDATE columnfamily SET data = 'test data' WHERE key = 'row1'; > as in CQL Update and insert are semantically the same.Could anyone please > advise? >
If you're looking for a way to update only existing records you need UPDATE IF EXISTS, which invokes an LWT. Cheers, -- Alex
