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Benjamin Lerer commented on CASSANDRA-10225:
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Computing the compression ratio by making the sum of the
{{compressedFileLength}} and dividing it by the sum of the {{dataLength}} does
not look a bad approach to me but it seems that the data length might not
always be the real length (according to a comment in {{CompressionMetadata}}).
[~benedict] I am not too familiar with this part of the code. Is there a risk
that computing the compression ratio this way give us a wrong result?
> Make compression ratio much more accurate
> -----------------------------------------
>
> Key: CASSANDRA-10225
> URL: https://issues.apache.org/jira/browse/CASSANDRA-10225
> Project: Cassandra
> Issue Type: Improvement
> Components: Tools
> Reporter: Jeremy Hanna
> Assignee: Brett Snyder
> Labels: lhf
> Fix For: 2.1.x
>
> Attachments: cassandra-2.1-10225.txt
>
>
> Currently in cfstats, it will take an average over the compression ratios of
> all of the sstables without regard to the data sizes. This can lead to a
> very inaccurate value. It would be good to factor in the uncompressed and
> compressed sizes for the sstables to give an accurate number.
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