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From "Davide Giannella (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (OAK-2939) Make compaction gain estimate more accurate
Date Wed, 02 Mar 2016 15:34:18 GMT

     [ https://issues.apache.org/jira/browse/OAK-2939?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Davide Giannella updated OAK-2939:
----------------------------------
    Fix Version/s: 1.4

> Make compaction gain estimate more accurate
> -------------------------------------------
>
>                 Key: OAK-2939
>                 URL: https://issues.apache.org/jira/browse/OAK-2939
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: segmentmk
>            Reporter: Michael Dürig
>            Assignee: Michael Dürig
>             Fix For: 1.3.1, 1.4
>
>
> Currently the compaction gain estimation process only takes the current head into account
when calculating the retained size. We could make it more accurate by also taking in memory
references into account. This would prevent compaction from running when many in memory references
would later on prevent segments from being cleaned up. 
> Also for OAK-2862, we would need a way to include the segments used for the persisted
compaction map in the retained size. 
> While at it, we could try to improve logging so information on how much space is retained
by the current head, in memory references and the persisted compaction map would be logged
separately. 



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