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From "Jonathan Ellis (Resolved) (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (CASSANDRA-3325) Compaction degrades key cache stats
Date Thu, 06 Oct 2011 16:05:29 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-3325?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jonathan Ellis resolved CASSANDRA-3325.
---------------------------------------

    Resolution: Fixed

committed to 1.0.0, thanks!
                
> Compaction degrades key cache stats
> -----------------------------------
>
>                 Key: CASSANDRA-3325
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3325
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 0.7.0
>            Reporter: Fabien Rousseau
>            Priority: Minor
>              Labels: compaction
>             Fix For: 1.0.0
>
>         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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