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Posted to oak-issues@jackrabbit.apache.org by "Marcel Reutegger (JIRA)" <ji...@apache.org> on 2016/07/19 11:25:20 UTC

[jira] [Resolved] (OAK-4528) diff calculation in DocumentNodeStore should try to re-use journal info on diff cache miss

     [ https://issues.apache.org/jira/browse/OAK-4528?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Marcel Reutegger resolved OAK-4528.
-----------------------------------
       Resolution: Fixed
    Fix Version/s: 1.5.6

> diff calculation in DocumentNodeStore should try to re-use journal info on diff cache miss
> ------------------------------------------------------------------------------------------
>
>                 Key: OAK-4528
>                 URL: https://issues.apache.org/jira/browse/OAK-4528
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: core, documentmk
>            Reporter: Vikas Saurabh
>            Assignee: Marcel Reutegger
>            Priority: Minor
>              Labels: observation, resilience
>             Fix For: 1.6, 1.5.6
>
>
> Currently, diff information is filled into caches actively (local commits pushed in local_diff, externally read changes pushed into memory_diff). At the time of event processing though, the entries could have already been evicted.
> In that case, we fall back to computing diff by comparing 2 node-states which becomes more and more expensive (and eventually fairly non-recoverable leading to OAK-2683).
> To improve the situation somewhat, we can probably try to consult journal entries to read a smaller-superset of changed paths before falling down to comparison.
> /cc [~mreutegg], [~chetanm], [~egli]



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