Francesco Mari created OAK-7866:
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Summary: Add tooling for recovering from an outdated journal
Key: OAK-7866
URL: https://issues.apache.org/jira/browse/OAK-7866
Project: Jackrabbit Oak
Issue Type: New Feature
Components: segment-tar
Reporter: Francesco Mari
Assignee: Francesco Mari
Fix For: 1.10
Some error conditions in the Segment Store might prevent the journal from being
updated. After a restart the system will be rolled back to the latest version
persisted in the journal. Every change performed after the system stopped
updating the journal appears to be lost.
Unless some deep inconsistencies are found in the segments, it might be
possible to recover from an outdated journal by performing the following steps:
* Backup the previous journal.
* Scan the segments for node records representing super-roots.
* Order the found records by segment creation date (ascending) and record
number (ascending).
* Create a new journal with the ordered entries.
* Perform a sanity check of the journal (as the "check" tool does).
We should have a tool executing these steps. Being a "porcelain" tool, it
should have a small and stable command-line interface, be safe in the face of
unexpected error conditions, and be friendly when communicating to the user
both in case of success and in case of errors.
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