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From "Julian Reschke (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (OAK-2110) performance issues with VersionGarbageCollector
Date Mon, 02 Feb 2015 15:23:35 GMT

    [ https://issues.apache.org/jira/browse/OAK-2110?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14301375#comment-14301375

Julian Reschke commented on OAK-2110:

Some thoughts:

- we will probably not be able to match the version that is optimized for Mongo, so it would
be good to have a consensus what *needs* to be achieved (this is a BG operation, right?)

- the limit on the batch size is mainly motivated by the size of the NodeDocuments returned
by query(); a variant that just returns identifiers might help

- alternatively, we could consider a new variant of query that takes more complex conditions
(operators other than >=, plus constraints on multiple indexed properties)

> performance issues with VersionGarbageCollector
> -----------------------------------------------
>                 Key: OAK-2110
>                 URL: https://issues.apache.org/jira/browse/OAK-2110
>             Project: Jackrabbit Oak
>          Issue Type: Bug
>          Components: mongomk
>            Reporter: Julian Reschke
>             Fix For: 1.1.7
> This one currently special-cases Mongo. For other persistences, it
> - fetches *all* documents
> - filters by SD_TYPE
> - filters by lastmod of versions
> - deletes what remains
> This is not only inefficient but also fails with OutOfMemory for any larger repo.

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