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From "Alex Parvulescu (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (OAK-4293) Refactor / rework compaction gain estimation
Date Tue, 09 Aug 2016 14:31:21 GMT

     [ https://issues.apache.org/jira/browse/OAK-4293?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Alex Parvulescu resolved OAK-4293.
----------------------------------
    Resolution: Fixed

marking as fixed. will followup later with the OSGi config bits.

> Refactor / rework compaction gain estimation 
> ---------------------------------------------
>
>                 Key: OAK-4293
>                 URL: https://issues.apache.org/jira/browse/OAK-4293
>             Project: Jackrabbit Oak
>          Issue Type: Task
>          Components: segment-tar
>            Reporter: Michael Dürig
>            Assignee: Alex Parvulescu
>              Labels: gc
>             Fix For: Segment Tar 0.0.10
>
>         Attachments: OAK-4293-v2.patch, size-estimation.patch
>
>
> I think we have to take another look at {{CompactionGainEstimate}} and see whether we
can up with a more efficient way to estimate the compaction gain. The current implementation
is expensive wrt. IO, CPU and cache coherence. If we want to keep an estimation step we need
IMO come up with a cheap way (at least 2 orders of magnitude cheaper than compaction). Otherwise
I would actually propose to remove the current estimation approach entirely 



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