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https://issues.apache.org/jira/browse/CASSANDRA-20092?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Branimir Lambov updated CASSANDRA-20092:
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Test and Documentation Plan: Existing tests exercise the new code, with
some updates to scanner-specific tests to test both simple and full-fledged
scanners.
Status: Patch Available (was: Open)
> 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
> Assignee: 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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