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From "Stefan Guggisberg (JIRA)" <j...@apache.org>
Subject [jira] Commented: (JCR-2407) Make the disk space used by cached binary properties configurable
Date Wed, 25 Nov 2009 10:42:47 GMT

    [ https://issues.apache.org/jira/browse/JCR-2407?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12782361#action_12782361
] 

Stefan Guggisberg commented on JCR-2407:
----------------------------------------

> [...] were the blobs are stored through the PM in the database.

this explains it. blobs read from a db are spooled to the local file system for performance
reasons, that's by design.

we could e.g. change the caching behavior of the SharedItemStateManager to not 'cache' PropertyState
instances with temp-file based binary values. but that seems a bit ugly.

another option would be to read the binary value on demand. this would however impact performance
and would require to tie the Value implementation directly to the persistence layer. we deliberately
avoided this in the past since that would sigificantly compromise the current design.
 
BTW: please note that the SharedItemStateManager 'cache' is not just a cache in the traditional
sense but also an integral part of jackrabbit's isolation level support (read committed).


> Make the disk space used by cached binary properties configurable
> -----------------------------------------------------------------
>
>                 Key: JCR-2407
>                 URL: https://issues.apache.org/jira/browse/JCR-2407
>             Project: Jackrabbit Content Repository
>          Issue Type: Improvement
>          Components: jackrabbit-core
>    Affects Versions: 2.0-beta1
>            Reporter: Martijn Hendriks
>
> Binary properties which are in Jackrabbit's caches (SharedItemStateManager eg) are stored
on disk in the temp dir. This can cause problems on small temporary file systems as the size
of the binary properties on disk is not limited by Jackrabbit. There is one way to influence
this indirectly: make the Jackrabbit cache sizes smaller (via the CacheManager). It could
be helpful in some cases if an upper bound on the disk usage can be given. 

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