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Posted to oak-issues@jackrabbit.apache.org by "Alex Parvulescu (JIRA)" <ji...@apache.org> on 2016/08/09 14:31:21 UTC

[jira] [Resolved] (OAK-4293) Refactor / rework compaction gain estimation

     [ 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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