Re: no change observed in read latency after switching from EBS to SSD storage

Mohammed, to add to previous answers, EBS is network attached, with SSD or without it , you access your disk via network constrained by network bandwidth and latency, if you really need to improve IO performance try switching to ephemeral storage (also called instance storage) which is physically

Re: Machine Learning With Cassandra

Adaryl, most ML algorithms are based on some form of numerical optimization, using something like online gradient descent or conjugate gradient (e.g in SVM classifiers).

Re: Time-series data model

James, i'm a big fan of Cassandra, but have you looked at http://en.wikipedia.org/wiki/RRDtool is is natively built for this type of problem Alex On Wed, Apr 14, 2010 at 9:02 AM, Jean-Pierre Bergamin wrote: > Hello everyone > > We are currently evaluating a new DB system (replacing MySQL) to st

Re: Sparse vs dense index

olumn name then > the other does. > > On Tue, Mar 16, 2010 at 12:15 PM, alex kamil wrote: > > which index structure would fit Cassandra more naturally and perform > better: > > 1) a sparse index where in each row there are 100 columns each containing > a > > 5MB data block

Sparse vs dense index

which index structure would fit Cassandra more naturally and perform better: 1) a sparse index where in each row there are 100 columns each containing a 5MB data block (under a single column family) or 2) a dense index where each row contains 100 columns with a single 6bytes value (under a single