How to write a trigger in Cassandra to only detect updates of an existing row ?

2016-10-04 Thread Kant Kodali
Hi all, How to write a trigger in Cassandra to detect updates? My requirement is that I want a trigger to alert me only when there is an update to an existing row and looks like given the way INSERT and Update works this might be hard to do because INSERT will just overwrite if there is an existin

merkle anti-entropy and balancing of trees

2016-10-04 Thread Robert Lemmen
hi everyone, I am trying to understand anti-entropy measures in general and specifically the ones used in cassandra. The more I look at it the more I get confused, so I would be glad if anyone could shed some light on the following question, or point me in the right direction: on the one hand a