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From "Thomas Mueller (JIRA)" <j...@apache.org>
Subject [jira] [Created] (OAK-120) MicroKernel API: specific retention policy of binaries
Date Wed, 30 May 2012 09:50:22 GMT
Thomas Mueller created OAK-120:

             Summary: 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

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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