The latter. On Thu, Apr 21, 2011 at 1:24 AM, Constantin Teodorescu <braila...@gmail.com> wrote: > Thank you very much Ellis, I heard about Brisk two weeks ago and I'm already > checking DataStax web site twice a day waiting for Brisk to come. > It seems that it will be a good solution for us. > Once more question please: the Brisk way of operation need to transfer > intermediate data from Cassandra storage to some sort of Hadoop storage? > Or it's just like that: > [ Cassandra data ] --> [ Hadoop Job Tracker ] --> [ Parallel N-nodes > MapReduce Task ] --> > [ Cassandra storage for temporary results ] --> [ Final 1-Node ReReduce Task > ] --> > [ Cassandra storage for final results ] > Thank you for your time, > Teo > > On Thu, Apr 21, 2011 at 5:38 AM, Jonathan Ellis <jbel...@gmail.com> wrote: >> >> You want to run map/reduce jobs for your use case. You can already do >> this with Cassandra (http://wiki.apache.org/cassandra/HadoopSupport), >> and DataStax is introducing Brisk soon to make it easier: >> http://www.datastax.com/products/brisk >> >> On Wed, Apr 20, 2011 at 9:36 PM, Jonathan Ellis <jbel...@gmail.com> wrote: >> > CQL changes the API, that is all. >> > >> > On Wed, Apr 20, 2011 at 5:40 PM, Constantin Teodorescu >> > <braila...@gmail.com> wrote: >> >> My use case is as follows: we are using in 70% of the jobs information >> >> retrieval using keys, column names and ranges and up to now, what we >> >> have >> >> tested suits our need. >> >> However, the rest of 30% of the jobs involve full sequential scan of >> >> all >> >> records in the database. >> >> I found some web pages describing the next good thing for cassandra 0.8 >> >> release, CQL, and I'm wondering: the CQL execution will involve >> >> separate >> >> processes running simultaneously on all nodes in the cluster that will >> >> do >> >> the "filtering and pre-sorting phase" on the local stored data (using >> >> indexes when available) and then execute the "merge phase" on a single >> >> node >> >> (that one that have received the request) ? >> >> Best regards, >> >> Teo >> >> >> > >> > >> > >> > -- >> > Jonathan Ellis >> > Project Chair, Apache Cassandra >> > co-founder of DataStax, the source for professional Cassandra support >> > http://www.datastax.com >> > >> >> >> >> -- >> Jonathan Ellis >> Project Chair, Apache Cassandra >> co-founder of DataStax, the source for professional Cassandra support >> http://www.datastax.com > >
-- Jonathan Ellis Project Chair, Apache Cassandra co-founder of DataStax, the source for professional Cassandra support http://www.datastax.com
