[jira] [Assigned] (OAK-3349) Partial compaction

["Francesco Mari (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/OAK-3349?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Francesco Mari reassigned OAK-3349:
-----------------------------------

    Assignee: Francesco Mari  (was: Michael Dürig)

> Partial compaction
> ------------------
>
>                 Key: OAK-3349
>                 URL: https://issues.apache.org/jira/browse/OAK-3349
>             Project: Jackrabbit Oak
>          Issue Type: New Feature
>          Components: segment-tar
>            Reporter: Michael Dürig
>            Assignee: Francesco Mari
>              Labels: compaction, gc, scalability
>             Fix For: 1.8, 1.7.4
>
>         Attachments: compaction-time.png, cycle-count.png, post-gc-size.png
>
>
> On big repositories compaction can take quite a while to run as it needs to create a full deep copy of the current root node state. For such cases it could be beneficial if we could partially compact the repository thus splitting full compaction over multiple cycles. 
> Partial compaction would run compaction on a sub-tree just like we now run it on the full tree. Afterwards it would create a new root node state by referencing the previous root node state replacing said sub-tree with the compacted one. 
> Todo: Asses feasibility and impact, implement prototype.



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