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https://issues.apache.org/jira/browse/CASSANDRA-8635?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Carl Yeksigian updated CASSANDRA-8635:
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Reviewer: Carl Yeksigian (was: Tyler Hobbs)
> 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
>
> Attachments:
> 0001-Include-cold-sstables-in-compactions-if-they-overlap.patch, 8635-v2.patch
>
>
> 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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