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https://issues.apache.org/jira/browse/CASSANDRA-20092?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17928177#comment-17928177
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Branimir Lambov commented on CASSANDRA-20092:
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There is some performance data in CASSANDRA-18802.
Roughly 10% improvement in compaction performance.
> SSTableScanner can be vastly simplified for compaction
> ------------------------------------------------------
>
> Key: CASSANDRA-20092
> URL: https://issues.apache.org/jira/browse/CASSANDRA-20092
> Project: Apache Cassandra
> Issue Type: Improvement
> Components: Local/Compaction
> Reporter: Branimir Lambov
> Assignee: Branimir Lambov
> Priority: Normal
> Fix For: 5.1
>
> Attachments: ci_summary_thelastpickle_mck-20092-5.0_154.html,
> results_details_thelastpickle_mck-20092-5.0_154.tar.xz
>
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> 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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