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You might want to allow updates to this partition to only create snapshot tags. This way you don't need an extended operation to take a snapshot.
Design
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Proposal
There are different levels to which we can implement this feature. I think we should enable different pluggable implementations for the change log service to expose different levels of functionality. To enable this we have to design a few different interfaces for the service and it's subcomponents. The following levels of functionality should be possible:
- Simple Change Log: logs changes only (no snapshots)
- Taggable Change Log: allows tagging for snapshots
- Searchable Change Log: allows tagging and taking snapshots with search capabilities
The same change log logic can be used to swap out different components of a log store to provide varying capabilities and still apply tags and changes to the store interface. Let's take a look at some of the store interfaces which really act as an SPI for this subsystem:
Representing Changes
Every change in an LDAP server can be logged and tracked using an LDIF. A special log of LDIF entries can track each new revision of the server. This can be used to audit changes on the DIT, on subtrees of the DIT, their entries and even on attributes. Each entry can track revisions in the change log using the revisions operational attribute. The revisions represent primary keys into the change log.
The change log should also track
Simple Logger
The first very basic functionality is to implement a basic logger. It has already been added, but some more elements need to be defined, like the way to start the logger turn versioning on and off, either via an LDAP extended request, or programmatically.
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