Tyler Hobbs created CASSANDRA-8635:
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Summary: 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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