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] > >
