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From Michael Dürig (JIRA) <j...@apache.org>
Subject [jira] [Comment Edited] (JCR-3477) Lazy query result sets
Date Wed, 05 Dec 2012 09:22:59 GMT

    [ https://issues.apache.org/jira/browse/JCR-3477?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13510373#comment-13510373
] 

Michael Dürig edited comment on JCR-3477 at 12/5/12 9:21 AM:
-------------------------------------------------------------

I have so far seen it for queries of type

   /jcr:root/root//element(*) 

when the tree rooted at "root" is large (no flat hierarchies involved). I.e. ~110k nodes bumps
memory usage up to 400MB on Query.execute(). 
                
      was (Author: mduerig):
    I have so far seen it for queries of type

   /jcr:root/root//element(*) 

when the tree rooted at "root" is large. I.e. ~110k nodes bumps memory usage up to 400MB on
Query.execute(). 
                  
> Lazy query result sets 
> -----------------------
>
>                 Key: JCR-3477
>                 URL: https://issues.apache.org/jira/browse/JCR-3477
>             Project: Jackrabbit Content Repository
>          Issue Type: Improvement
>          Components: jackrabbit-core
>            Reporter: Alex Parvulescu
>            Priority: Minor
>
> Following JCR-3472, I'd like to open a discussion on what can be reasonably expected
from a query that does/can do lazy fetching of results.
> Creating ~110k nodes and fetching them all looks like it goes in the vicinity of 400mb
of memory, so the default 256mb setup for tests is not sufficient to run such a test, as we've
already seen on JCR-3472.
> What are the expectations around lazy loading and queries that can potentially hit a
high number of nodes.

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