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From Edward Capriolo <>
Subject Re: a question on cassandra data file size
Date Fri, 30 Mar 2012 14:18:27 GMT
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

On Fri, Mar 30, 2012 at 9:01 AM, Yiming Sun <> 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.

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