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From "Marcel Reutegger (JIRA)" <j...@apache.org>
Subject [jira] Commented: (JCR-1041) Avoid using BitSets in ChildAxisQuery to minimize memory usage
Date Tue, 14 Aug 2007 11:45:31 GMT

    [ https://issues.apache.org/jira/browse/JCR-1041?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12519649
] 

Marcel Reutegger commented on JCR-1041:
---------------------------------------

Very nice work.

Can you please add a copy right header to the new files? And then feel free to commit the
changes.

> Avoid using BitSets in ChildAxisQuery to minimize memory usage
> --------------------------------------------------------------
>
>                 Key: JCR-1041
>                 URL: https://issues.apache.org/jira/browse/JCR-1041
>             Project: Jackrabbit
>          Issue Type: Improvement
>          Components: query
>    Affects Versions: 1.3
>            Reporter: Christoph Kiehl
>            Assignee: Christoph Kiehl
>         Attachments: avoid_using_bitsets.patch
>
>
> When doing ChildAxisQueries on large indexes the internal BitSet instance (hits) may
consume a lot of memory because the BitSet is always as large as IndexReader.maxDoc(). In
our case we had a query consisting of 7 ChildAxisQueries which combined to a total of 14MB.
Since we have multiple users executing this query simultaneously this caused an out of memory
error.

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