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https://issues.apache.org/jira/browse/OAK-120?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thomas Mueller updated OAK-120:
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Attachment: OAK-120.patch
Proposed patch
> MicroKernel API: specific retention policy of binaries
> ------------------------------------------------------
>
> Key: OAK-120
> URL: https://issues.apache.org/jira/browse/OAK-120
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: mk
> Reporter: Thomas Mueller
> Attachments: OAK-120.patch
>
>
> A MicroKernel implementation needs to remove unused binaries. As the API
> doesn't have a way to manually remove binaries (see also OAK-117), we need to
> specify a retention policy (the rules for which binaries can be removed and
> which ones need to be retained). The idea is that a MicroKernel
> implementation uses a garbage collection algorithm to remove unused binaries
> from time to time.
> There are two classes of binaries that need to be retained:
> (A) binaries referenced within the nodes (as property values)
> (B) temporary binaries (not [yet] referenced)
> For (B) we could use the same retention policy as for revisions (keep
> temporary binaries as long as old revisions are kept).
> For (A) we need to specify the property value format, so the MicroKernel can
> retain binaries based on the content. One idea is that binary values should
> be kept if there is a node with property value ":blobId:<blobId>", or a node
> with an array property value [..., ":blobId:<blobId>",...].
> I will create a patch.
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