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Posted to commits@cassandra.apache.org by "Tyler Hobbs (JIRA)" <ji...@apache.org> on 2015/01/16 01:44:35 UTC
[jira] [Created] (CASSANDRA-8635) STCS cold sstable omission does
not handle overwrites without reads
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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