> Is it possible to use CL_ONE with hadoop/cassandra when doing an M/R job? That's the default. https://github.com/apache/cassandra/blob/cassandra-1.2/src/java/org/apache/cassandra/hadoop/ConfigHelper.java#L383
> And more importantly is there a way to configure that such that if my RF=3, > that it only reads from 1 of the nodes in that 3. That's how it works AFAIK. > We have 12 nodes and ideally we would for example hope M/R runs on > a2, a9, a5, a12 which happen to cover all token ranges. > > This would leave a1, a3, a4, a6, a7, a8, a10, a11 to be free for the > real-time work. You could try only putting slots on those machines, not sure if that would work though. The best way to isolate transactional and analytical load is to use multiple DC's. Cheers ----------------- Aaron Morton Cassandra Consultant New Zealand @aaronmorton http://www.thelastpickle.com On 27/07/2013, at 3:33 AM, "Hiller, Dean" <dean.hil...@nrel.gov> wrote: > Is it possible to use CL_ONE with hadoop/cassandra when doing an M/R job? And > more importantly is there a way to configure that such that if my RF=3, that > it only reads from 1 of the nodes in that 3. > > We have 12 nodes and ideally we would for example hope M/R runs on > a2, a9, a5, a12 which happen to cover all token ranges. > > This would leave a1, a3, a4, a6, a7, a8, a10, a11 to be free for the > real-time work. > > (That was just an example…obviously, I could pick another 4 nodes that cover > all token ranges). > > Thanks, > Dean
