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From "Alex Parvulescu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (OAK-2322) Compaction estimation includes all data segments
Date Fri, 05 Dec 2014 09:12:13 GMT

    [ https://issues.apache.org/jira/browse/OAK-2322?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14235291#comment-14235291
] 

Alex Parvulescu commented on OAK-2322:
--------------------------------------

More to the point, where there are cleared checkpoints in a system with external data store,
those will never get reported as garbage.

> Compaction estimation includes all data segments
> ------------------------------------------------
>
>                 Key: OAK-2322
>                 URL: https://issues.apache.org/jira/browse/OAK-2322
>             Project: Jackrabbit Oak
>          Issue Type: Bug
>          Components: core, segmentmk
>            Reporter: Alex Parvulescu
>            Assignee: Alex Parvulescu
>
> The original design of the compaction estimator was to only focus on binary segments
when computing the amount of garbage that can be collected.
> This has a flaw when it runs on systems with external data stores configured as there
will be almost no binary segments and the estimation will always be _0_, no need for compaction.
> The change to include all segments is not big, the _uuids_ bloomfilter is already initialized
with the total number of segments, and the segment collection already loads everything in
memory.



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