Tomek Rękawek created OAK-7735:
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Summary: Split segment store persistence
Key: OAK-7735
URL: https://issues.apache.org/jira/browse/OAK-7735
Project: Jackrabbit Oak
Issue Type: Story
Components: segment-tar
Reporter: Tomek Rękawek
Fix For: 1.10
Split segment store persistence is a proxy layer that can be used between the
SegmentMK and the actual segment store persistence. It's configured with two
backends: read-only and read-write. It delegates all the read requests to the
read-only backend, but any write request (eg. creating a new segment) is
delegated to the read-write backend.
The main advantage is that we can have a segment store in the cloud (using the
oak-segment-azure), shared amongst many Oak instances, starting dynamically.
All the changes specific for a given instance are stored locally, with the
TarPersistence.
The implementation remembers the state (tar file list, last journal entry) of
the read-only backend during it's initialisation, so the read-only backend can
be used by a different instance, as long as it only appends new segments (eg.
no compaction).
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