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From "Marcel Reutegger (Jira)" <j...@apache.org>
Subject [jira] [Resolved] (OAK-8623) Improve collision handling performance
Date Mon, 07 Oct 2019 08:34:00 GMT

     [ https://issues.apache.org/jira/browse/OAK-8623?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Marcel Reutegger resolved OAK-8623.
    Resolution: Fixed

> Improve collision handling performance
> --------------------------------------
>                 Key: OAK-8623
>                 URL: https://issues.apache.org/jira/browse/OAK-8623
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: documentmk
>            Reporter: Marcel Reutegger
>            Assignee: Marcel Reutegger
>            Priority: Major
>             Fix For: 1.20.0
>         Attachments: OAK-8623-2.patch, OAK-8623.patch
> The current collision handling on conflict in the DocumentNodeStore can be rather expensive
when there are old branch commits which were not merged.
> A commit that includes documents with old branch commits that have not been merged will
always attempt to set a collision marker on the commit root document for those changes.
> While it is difficult to tell whether a branch commit will be merged at some point, at
least those branch commits that were created before the most recent startup of a cluster node
cannot be merged. The collision handling logic could be improved to take the start time of
a cluster node into account.

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