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https://issues.apache.org/jira/browse/JCR-851?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12489870
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Jukka Zitting commented on JCR-851:
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The most usual (only?) reason for a client to create QValues is when the client
wants to store content in the repository. I would argue that in 99% of those
cases the created QValue is never read by the client.
> 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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