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https://issues.apache.org/jira/browse/JCR-851?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12489866
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Julian Reschke commented on JCR-851:
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I'm not sure I understand.
The code implementing QValue has no way to predict who is going to call
getStream(), and in which order this will occur. If it doesn't copy the data
upon creation, it will have to when it's read first. How exactly does that
help, except by delaying the issue, and by potentially optimizing the case that
getStream() never get's called?
> Handling of binary properties (streams) in QValue interface
> -----------------------------------------------------------
>
> Key: JCR-851
> URL: https://issues.apache.org/jira/browse/JCR-851
> Project: Jackrabbit
> Issue Type: Improvement
> Components: SPI
> Reporter: Julian Reschke
>
> The current SPI requires QValue to return new streams upon each call to
> getStream(). As far as I can tell, this essentially requires a QValue
> implementation to preserve the whole content of a stream, be it in memory or
> on disk.
> In particular (and unless I'm missing something), when importing large
> content into a repository, this causes the whole data stream to be written
> twice. We really should try to avoid that.
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