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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