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https://issues.apache.org/jira/browse/CASSANDRA-20092?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17899550#comment-17899550
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Benedict Elliott Smith commented on CASSANDRA-20092:
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Just an FYI, that iirc (and I may be wrong), the reason for this approach was
to handle corrupted partitions.
I agree with improving this, just something to bear in mind as you do; it might
be that a fallback path is needed.
> SSTableScanner can be vastly simplified for compaction
> ------------------------------------------------------
>
> Key: CASSANDRA-20092
> URL: https://issues.apache.org/jira/browse/CASSANDRA-20092
> Project: Cassandra
> Issue Type: Improvement
> Components: Local/Compaction
> Reporter: Branimir Lambov
> Priority: Normal
>
> One of the main bottlenecks for compaction performance is its use of the
> {{SSTableScanner}} class, whose main purpose is to implement partition range
> queries and as such supports filtering by row and column that is not helpful
> to compaction. To implement the latter it must rely on the sstable's index,
> adding a lot of complexity and inefficiency.
> Implementing a simpler version of a scanner that reads off the data file
> directly for given spans of offsets would speed up compaction significantly.
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