Standard columns save size over super columns. Not 50% but depending on the size of the data (3 byte values) the overhead could be significant. I have noticed that post sstable rebuild, 1.0 kicked off some comp actions behind the scenes shrinking some files significantly.
On Fri, Mar 30, 2012 at 9:01 AM, Yiming Sun <yiming....@gmail.com> wrote: > Hi, > > I have a question on the size of cassandra data files. After we upgraded > from cassandra 0.8 to 1.0, and changed our schema to use regular columns > instead of supercolumns, the aggregated size of cassandra data files reduced > by more than half. The source data set is the same, and we didn't set any > compression options in the new schema. > > The reduction of data file is good, but we still would like to know a little > more about the reason behind this reduction. Could someone enlighten me, > please? Thanks. > > -- Y.
