Sam Tunnicliffe created CASSANDRA-14412:
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Summary: 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: Lifecycle
Reporter: Sam Tunnicliffe
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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