Answers inline. On Fri, Nov 4, 2011 at 4:59 PM, Vlad Paiu <vladp...@opensips.org> wrote:
> Hello, > > I'm a new user of Cassandra and I think it's great. > Still, while developing my APP using Cassandra, I got stuck with some > things and I'm not really sure that Cassandra can handle them at the moment. > > So, first of all, does Cassandra allow for Counters and regular Keys to be > located in the same ColumnFamily ? > What do you mean when you say "regular Keys"? If you are hinting at columns apart from counters, then the answer is *no*: only counters can exist in a CounterColumnFamily and other column families cannot hold counters. > > Secondly, is there any way to dynamically set the TTL for a key ? In the > sense that I have a key, I initially set it with no TTL, but after a while > I decide that it should expire in 100 seconds. Can Cassandra do this ? > TTL is not for one key, it is for one column. > > 3. Can counters have a TTL ? > No. Currently, counters do not (or if I am correct - cannot) have TTL. > > 4. Is there any way to atomically reset a counter ? I read on the website > that the only way to do it is read the variable value, and then set it to > -value, which seems rather bogus to me. > I think that is the only way to reset a counter. I would like to know if there is another way. Background: I am using Cassandra since the past two months. Hope the community corrects me if I am wrong. > > Regards, > > -- > Vlad Paiu > OpenSIPS Developer > > -- Regards Amit S. Chavan
