Here you got a good explaination of how the counters work. Video : http://blip.tv/datastax/counters-in-cassandra-5497678 Sildes : http://www.datastax.com/wp-content/uploads/2011/07/cassandra_sf_counters.pdf
I think it will answer your question and help you understanding interesting things about counters. If you need a short answer, it concurrency will be handled nicely and you'll have the expected result. Alain 2012/3/14 Tamar Fraenkel <ta...@tok-media.com> > Hi! > > My apologies for the naive question, but I am new to Cassandra and even > more to counter columns. > > If I have a counter column, what happens if two threads are trying to > increment it's value at the same time for the same key? > > Thanks, > > *Tamar Fraenkel * > Senior Software Engineer, TOK Media > > [image: Inline image 1] > > ta...@tok-media.com > Tel: +972 2 6409736 > Mob: +972 54 8356490 > Fax: +972 2 5612956 > > > >
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