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https://issues.apache.org/jira/browse/OAK-11444?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17922690#comment-17922690
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José Andrés Cordero Benítez commented on OAK-11444:
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That would be a good point, we never thought there could be places that assume
there are exactly four collections.
Moving it into SETTINGS collection could be an option, I think this collection
is used only to read specific configs, meaning we can assume there is no
operation to traverse it and look for documents, so it could work.
> [full-gc] Save document id and empty properties names before deletion
> ----------------------------------------------------------------------
>
> Key: OAK-11444
> URL: https://issues.apache.org/jira/browse/OAK-11444
> Project: Jackrabbit Oak
> Issue Type: Story
> Components: mongomk
> Reporter: Daniel Iancu
> Priority: Major
>
> Store document ID and empty properties names into a dedicated *_bin*
> collection
> before physically deletion from Mongo nodes collection during full gc.
> Motivation behind this change is that in case of accidentally deleting data
> that should have not been deleted (not garbage) this `log` of removed
> documents and properties will help the complete restoration from backup.
> A separate collection was preferred instead of logging to files because is
> more reliable. Logs usually needs to be exported to platform like Splunk and
> the process does not guarantee that all logs are saved.
> The data saved in *_bin* collection is temporary, the cleaning can be done
> via setting document TTL or by using an external job to remove it.
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