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From "Francesco Mari (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (OAK-7866) Add tooling for recovering from an outdated journal
Date Tue, 04 Dec 2018 13:40:00 GMT

     [ https://issues.apache.org/jira/browse/OAK-7866?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Francesco Mari resolved OAK-7866.
       Resolution: Fixed
    Fix Version/s: 1.9.13

> Add tooling for recovering from an outdated journal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
>            Priority: Major
>             Fix For: 1.10, 1.9.13
> 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from an outdated journal by performing the following steps: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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