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https://issues.apache.org/jira/browse/JCR-1825?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12641336#action_12641336
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Przemo Pakulski commented on JCR-1825:
--------------------------------------

Without setting copyWhenReading  to true usage of DBDataStore is dangerous, 
could be a bottleneck depending how long streams are kept open.
If streams are not closed DBDataStore hangs/locks.

> DBDataStore doesn't support concurrent reads
> --------------------------------------------
>
>                 Key: JCR-1825
>                 URL: https://issues.apache.org/jira/browse/JCR-1825
>             Project: Jackrabbit
>          Issue Type: Bug
>          Components: jackrabbit-core
>    Affects Versions: 1.5.0
>            Reporter: Przemo Pakulski
>             Fix For: 1.5.0
>
>
> My understanding is that setting parameter copyWhenReading to true should 
> allow concurrent reads by spooling binary property to temporary file and free 
> database resources (connection) immediately to make it available for other 
> threads.
> After applying patch for JCR-1388, DBDataStore doesn't support concurrent 
> reads anymore, resultSet is kept open and db connection is blocked until the 
> stream is read and closed. When copyWhenReading is set to true db connection 
> should be released immediately, this is the reason i guess why temporary file 
> is used.

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