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https://issues.apache.org/jira/browse/JCR-2407?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12782831#action_12782831
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Martijn Hendriks commented on JCR-2407:
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After having a look at the code I also think that this problem is specific for
deployments that use a BlobStore and not the DataStore. The DbDataStore seems
to cache nothing on the local file system (except when copyWhileReading is true
but even then the temp file is deleted after closing the stream). So repeated
reads just stream the blob every time from the database? If so, isn't this a
performance issue?
I can see the performance advantages of caching the DB blob in the temp dir
clearly. Can we add information about the disk usage to the Cache interface
similar the getMemoryUsed method? The PropertyState class should then also get
a method similar to calculateMemoryFootprint for the disk footprint. The
CacheManager and Cache implementations can then use this additional information
to evict binary properties if necessary. This might fit in quite cleanly in the
current design :)
> 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
> Attachments: repository.xml, workspace.xml
>
>
> 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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