On Wed, Aug 7, 2013 at 10:47 AM, Aaron Morton <aa...@thelastpickle.com>wrote:
> As for the atomic increment, I take the answer is 'no, there is no atomic > increment, I have to pull the value to the client and send an update with > the new value'. > > Saying "atomic increment" is probably confusing. > You cannot have Counters, the thing most people would think about when you > say "increment", in a collection type. > > You can update the values in a map server side. > > If you can provide a concrete example of what you want to do it may be > easier. > > I think the OP is asking if the following op is atomic: UPDATE users SET favs['posts'] = favs['post'] + 1 WHERE id = 'smith' :- a) Cheers > > ----------------- > Aaron Morton > Cassandra Consultant > New Zealand > > @aaronmorton > http://www.thelastpickle.com > > On 6/08/2013, at 10:05 PM, Andy Twigg <andy.tw...@gmail.com> wrote: > > Counters can be atomically incremented ( > http://wiki.apache.org/cassandra/Counters). Pick a UUID for the counter, > and use that: c=map.get(k); c.incr() > > > On 6 August 2013 11:01, Jan Algermissen <jan.algermis...@nordsc.com>wrote: > >> >> On 06.08.2013, at 11:36, Andy Twigg <andy.tw...@gmail.com> wrote: >> >> > Store pointers to counters as map values? >> >> Sorry, but this fits into nothing I know about C* so far - can you >> explain? >> >> Jan >> >> > > > -- > Dr Andy Twigg > Junior Research Fellow, St Johns College, Oxford > Room 351, Department of Computer Science > http://www.cs.ox.ac.uk/people/andy.twigg/ > andy.tw...@cs.ox.ac.uk | +447799647538 > > > -- :- a) Alex Popescu Sen. Product Manager @ DataStax @al3xandru
