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https://issues.apache.org/jira/browse/CASSANDRA-14412?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16814452#comment-16814452
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Tommy Stendahl commented on CASSANDRA-14412:
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It would be nice to have this feature enabled again, it definitely looks like
it was removed by mistake. Extending this with snapshots of the
{{system_schema}} is a good thing.
I have looked at the patch and it LGTM with one comment:
* I think the test case
{{SystemKeyspaceTest.snapshotSystemKeyspaceIfUpgrading()}} should be extended
so it also check the snapshot for {{system_schema}}.
otherwise I'm +1 for this.
> Restore automatic snapshot of system keyspace during upgrade
> ------------------------------------------------------------
>
> Key: CASSANDRA-14412
> URL: https://issues.apache.org/jira/browse/CASSANDRA-14412
> Project: Cassandra
> Issue Type: Bug
> Components: Local/Startup and Shutdown
> Reporter: Sam Tunnicliffe
> Assignee: Sam Tunnicliffe
> Priority: Normal
> Fix For: 4.0
>
>
> Since 2.2, the installed version is compared with the version persisted in
> system.local (if any) at startup. If these versions differ, the system
> keyspace is snapshotted before proceeding in order to enable a rollback if
> any other issue prevents startup from completing. Although the method to
> perform this check & snapshot is still present in {{SystemKeyspace}}, its
> only callsite was mistakenly removed from {{CassandraDaemon}} in
> CASSANDRA-12716.
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