i can haz hints pleez? On Wed, May 5, 2010 at 9:28 PM, philip andrew <philip14...@gmail.com> wrote: > Starfish loves you. > > On Wed, May 5, 2010 at 1:16 PM, David Strauss <da...@fourkitchens.com> > wrote: >> >> On 2010-05-05 04:50, Denis Haskin wrote: >> > I've been reading everything I can get my hands on about Cassandra and >> > it sounds like a possibly very good framework for our data needs; I'm >> > about to take the plunge and do some prototyping, but I thought I'd >> > see if I can get a reality check here on whether it makes sense. >> > >> > Our schema should be fairly simple; we may only keep our original data >> > in Cassandra, and the rollups and analyzed results in a relational db >> > (although this is still open for discussion). >> >> This is what we do on some projects. This is a particularly nice >> strategy if the raw : aggregated ratio is really high or the raw data is >> bursty or highly volatile. >> >> Consider Hadoop integration for your aggregation needs. >> >> > We have fairly small records: 120-150 bytes, in maybe 18 columns. >> > Data is additive only; we would rarely, if ever, be deleting data. >> >> Cassandra loves you. >> >> > Our core data set will accumulate at somewhere between 14 and 27 >> > million rows per day; we'll be starting with about a year and a half >> > of data (7.5 - 15 billion rows) and eventually would like to keep 5 >> > years online (25 to 50 billion rows). (So that's maybe 1.3TB or so >> > per year, data only. Not sure about the overhead yet.) >> > >> > Ideally we'd like to also have a cluster with our complete data set, >> > which is maybe 38 billion rows per year (we could live with less than >> > 5 years of that). >> > >> > I haven't really thought through what the schema's going to be; our >> > primary key is an entity's ID plus a timestamp. But there's 2 or 3 >> > other retrieval paths we'll need to support as well. >> >> Generally, you do multiple retrieval paths through denormalization in >> Cassandra. >> >> > Thoughts? Pitfalls? Gotchas? Are we completely whacked? >> >> Does the random partitioner support what you need? >> >> -- >> David Strauss >> | da...@fourkitchens.com >> Four Kitchens >> | http://fourkitchens.com >> | +1 512 454 6659 [office] >> | +1 512 870 8453 [direct] >> > >
-- dwh
