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https://issues.apache.org/jira/browse/CASSANDRA-8635?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14285278#comment-14285278
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Marcus Eriksson commented on CASSANDRA-8635:
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Started this yesterday, I'll most likely have a patch ready for review today
> STCS cold sstable omission does not handle overwrites without reads
> -------------------------------------------------------------------
>
> Key: CASSANDRA-8635
> URL: https://issues.apache.org/jira/browse/CASSANDRA-8635
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Reporter: Tyler Hobbs
> Assignee: Marcus Eriksson
> Priority: Critical
> Fix For: 2.1.3
>
>
> In 2.1, STCS may omit cold SSTables from compaction (CASSANDRA-6109). If
> data is regularly overwritten or deleted (but not enough to trigger a
> single-sstable tombstone purging compaction), data size on disk may
> continuously grow if:
> * The table receives very few reads
> * The reads only touch the newest SSTables
> Basically, if the overwritten data is never read and there aren't many
> tombstones, STCS has no incentive to compact the sstables. We should take
> sstable overlap into consideration as well as coldness to address this case.
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