[jira] [Created] (OAK-9888) Support more flexible SplitPersistence setups via OSGi

["Julian Sedding (Jira)" <ji...@apache.org>]

Julian Sedding created OAK-9888:
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             Summary: Support more flexible SplitPersistence setups via OSGi
                 Key: OAK-9888
                 URL: https://issues.apache.org/jira/browse/OAK-9888
             Project: Jackrabbit Oak
          Issue Type: Story
          Components: segment-azure, segment-tar
    Affects Versions: 1.44.0
            Reporter: Julian Sedding
            Assignee: Julian Sedding


I am working on implementing a use-case where we want to use a {{SplitPesistence}} that starts with a {{TarPersistence}} base "seed" repository and layers its mutable storage on top using an {{AzurePersistence}}.

Currently, in OSGi, it is only possible to configure the reverse of this setup, i.e. an {{AzurePersistence}} as the base and a {{TarPersistence}} as the mutable layer on top.

I propose to add a generic mechanism to configure and use a {{SplitPersistence}} instance in the following way:

* support configuration of an optional "role" property for {{AzureSegmentStoreService}}
* create a {{TarPersistenceService}} to allow configuring and registering a {{TarPersistence}} instance in OSGi, also with an optional "role" property
* create a {{SplitPersistenceService}} to allow configuring and registering a {{SplitPersistence}} instance in OSGi, also with an optional "role" property

By default the {{SplitPersistenceService}} references its read-only persistence with the target filter "(role=split-persistence-ro)" and its read-write persistence with the target filter "(role=split-persistence-rw)". It registers itself with "role=split-persistence".

Finally, in order to use the {{SplitPersistence}} a {{SegmentNodeStoreService}} (or {{SegmentNodeStoreFactory}}) can be configured with "customSegmentStore=true" and "segmentStore.target=(role=split-persistence)" (leveraging the feature of OSGi Declarative Services to [configure target filters|https://docs.osgi.org/specification/osgi.cmpn/8.0.0/service.component.html#service.component-target.property] for references).








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