http://www.datastax.com/support-forums/topic/atomicity-and-validation Software, Support, and Training for Apache Cassandra en-US Fri, 24 May 2013 12:11:00 +0000 http://bbpress.org/?v=1.0.3 q http://www.datastax.com/support-forums/search.php http://www.datastax.com/support-forums/topic/atomicity-and-validation#post-289 Fri, 08 Jul 2011 03:44:46 +0000 jeffpk 289@http://www.datastax.com/support-forums/ <p>Really, as I thought about it, what I am asking for is a VERY limited form of consistency.</p> <p>Its consistency on a single node, over a single row, only for as long as the update takes. </p> http://www.datastax.com/support-forums/topic/atomicity-and-validation#post-286 Thu, 07 Jul 2011 20:29:32 +0000 jeffpk 286@http://www.datastax.com/support-forums/ <p>As I understand it, all column updates within a single row and a single update request are atomic.</p> <p>My question is this, is the validation call made to validate that update also atomic, in the sense that the current values of the row, if checked by the validation call, will not change underneath the update?</p> <p>You can think of this sort of like a write lock on the row that begins at validation time and ends when the update completes. This is necessary behavior for some synchronization we need to do. (Basically the validity of the update depends on the comaprison of certain values of the current row and the update values.)</p> <p>Thanks</p> <p>JK </p>