Hi All, Making transaction is my actual preoccupation of the moment.
My need is : - update data in column family #1 - insert data in column family #2 My need is to see thes opérations in a single "transaction" because the data is tightly coupled. I use zookeeper/cage to make distributed lock to avoid multiple client inserting or updating on the same data. But there is a problem there is a fail when inserting in column family 2 because i have to "rollback" updated data of the column family #1. My reading on the subject is that to solve the fail : - Can we really consider that "write never fail" with cassandra from the time the execution of a mutation happened on a node. What can be the cause of fail at this point? So is it important to thinking about this potential problem? (yes in my opinion but i'm not totally sure). - Make a retry first. Is there really a chance for the second try to succeed if the first fail? - keep the "transaction data" to have the possibility to rollback programmatically by deleting the inserting data. The problem is on the updated data to rollback because old values are lost. I read what "Read before write" is a bad idea to save old values before the update. the problem remains, so how to do? Do you have any feedback on this topic? Regards, Jérémy Le jeudi 23 juin 2011 à 16:23 -0700, Les Hazlewood a écrit : > Thanks for the pointer Ryan! > > > > Regards, > > > Les > > > > >
