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From "Marcus Eriksson (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-8635) STCS cold sstable omission does not handle overwrites without reads
Date Wed, 02 Dec 2015 09:44:11 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-8635?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Marcus Eriksson updated CASSANDRA-8635:
---------------------------------------
    Component/s: Local Write-Read Paths
                 Compaction

> 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: Compaction
>            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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