[jira] [Created] (CASSANDRA-18460) CEP-21 Ensure that ClusterMetadata::forceEpoch keeps component epochs consistent

["Sam Tunnicliffe (Jira)" <ji...@apache.org>]

Sam Tunnicliffe created CASSANDRA-18460:
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             Summary: CEP-21 Ensure that ClusterMetadata::forceEpoch keeps component epochs consistent
                 Key: CASSANDRA-18460
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-18460
             Project: Cassandra
          Issue Type: Improvement
          Components: Transactional Cluster Metadata
            Reporter: Sam Tunnicliffe
            Assignee: Sam Tunnicliffe


{{forceEpoch}} is used to make the application of multiple transformations in series appear as a single atomic update. It's primary use is in {{UnsafeJoin}} (i.e. join without bootstrap) to apply the usual sequence of start/mid/finish join in a single transformation. In such cases, we must ensure that no component of {{ClusterMetadata}} which maintains its own last-modified epoch, ends up with an epoch greater than the one of the enclosing {{ClusterMetadata}}. 




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