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https://issues.apache.org/jira/browse/CASSANDRA-3325?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Fabien Rousseau updated CASSANDRA-3325:
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Attachment: 001-CASSANDRA-3325.patch
> Compaction degrades key cache stats
> -----------------------------------
>
> Key: CASSANDRA-3325
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3325
> Project: Cassandra
> Issue Type: Bug
> Affects Versions: 0.8.6
> Reporter: Fabien Rousseau
> Priority: Minor
> Attachments: 001-CASSANDRA-3325.patch
>
>
> When "compaction_preheat_key_cache" is set to true, then during compaction,
> it keep tracks of cached keys to to re-cache their new position.
> It does this by calling the following method on every key of the compacted
> sstable :
> sstable.getCachedPosition(row.key)
> which also update cache stats, thus lowering hit rate
> Below is an attached patch allowing to know if the key is cached, but without
> updating the stats.
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