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Posted to oak-issues@jackrabbit.apache.org by "Tomek Rękawek (JIRA)" <ji...@apache.org> on 2017/08/18 08:35:00 UTC

[jira] [Assigned] (OAK-6560) Sidegrade uses too much memory

     [ https://issues.apache.org/jira/browse/OAK-6560?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tomek Rękawek reassigned OAK-6560:
----------------------------------

    Assignee: Tomek Rękawek

> Sidegrade uses too much memory
> ------------------------------
>
>                 Key: OAK-6560
>                 URL: https://issues.apache.org/jira/browse/OAK-6560
>             Project: Jackrabbit Oak
>          Issue Type: Bug
>          Components: upgrade
>            Reporter: Tomek Rękawek
>            Assignee: Tomek Rękawek
>             Fix For: 1.8, 1.7.6
>
>
> Repo migration from old segment to oak segment tar requires heap memory proportional to the repository size, which does not scale well for large-scale repositories. Also, some structures (e.g. lots of direct children) have a big impact on the memory footprint.
> For some repositories, the sidegrade requires as much as 40GB heap to perform the migration, which might not be an option for most of the customers.



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