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https://issues.apache.org/jira/browse/OAK-3739?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julian Reschke updated OAK-3739:
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Summary: RDB*Store: allow schema evolution part 1: check for required
columns, log unexpected new columns (was: RDB*Store: allow schema evolution)
> RDB*Store: allow schema evolution part 1: check for required columns, log
> unexpected new columns
> ------------------------------------------------------------------------------------------------
>
> Key: OAK-3739
> URL: https://issues.apache.org/jira/browse/OAK-3739
> Project: Jackrabbit Oak
> Issue Type: Technical task
> Components: rdbmk
> Reporter: Julian Reschke
> Assignee: Julian Reschke
>
> In the future, we may have to add new table columns (for instance, see
> OAK-3730).
> We can somewhat decouple database changes from code changes by only using new
> columns when they are present.
> However, we need to make sure that once the columns have been added and the
> system has started to use them, no older code writes to the DB (potentially
> causing inconsistencies because of not updating these columns).
> To prevent this, code could check that it understands all columns it finds on
> startup. If there are unknown columns, it would need to abort and log an
> error that explains the compatibility issue.
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