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From "Antonio Carballo (JIRA)" <j...@apache.org>
Subject [jira] Commented: (JCR-1663) REFERENCE properties produce duplicate strings in memory
Date Thu, 17 Jul 2008 14:45:32 GMT

    [ https://issues.apache.org/jira/browse/JCR-1663?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12614369#action_12614369
] 

Antonio Carballo commented on JCR-1663:
---------------------------------------

Thank you Roman for the java file and comments.
==
We ran more tests (2gb, 30,000+ documents, 10 different doc types) over the weekend and concluded
that the patch does alleviate this particular memory issue. However, the JCR engine continues
to hang on to memory. Eventually it hits the 'wall' and slows down the response time. Thanks
for the patch.


> REFERENCE properties produce duplicate strings in memory
> --------------------------------------------------------
>
>                 Key: JCR-1663
>                 URL: https://issues.apache.org/jira/browse/JCR-1663
>             Project: Jackrabbit
>          Issue Type: Improvement
>          Components: jackrabbit-core, jackrabbit-spi-commons
>    Affects Versions: 1.4, core 1.4.5
>            Reporter: Roman Puchkovskiy
>         Attachments: JCR-1663.patch
>
>
> When reference property is loaded from PM, Serializer.deserialize(NodeReferences, InputStream)
is called, which calls PropertyId.valueOf(String), which in turn calls NameFactoryImpl.create(String)
which finally splits a full property name to namespace and local name. Namespace is internalized,
but local name is not (comments say that this is done to avoid perm space overfilling).
> So, in the end, a new String instance is created for local name. This leads to considerable
memory waste when repository has a lot of nodes with REFERENCE properties.
> It seems that local name part could be internalized here too because in the most repositories
it's not allowed to create properties with arbitrary names, so the danger of perm space exhaust
does not seem to be an argument.
> As for ways to resolve this, maybe a new NameFactory implementation could be created
which would be used for properties only (and, possibly, mainly in the PropertyId.valueOf(String))
which would extend an existing NameFactoryImpl overriding its create(String) method.
> What do you think about all this?

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