Aleksey Yeschenko created CASSANDRA-15454:
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Summary: Update generations and update comments for altered
distributed system keyspaces
Key: CASSANDRA-15454
URL: https://issues.apache.org/jira/browse/CASSANDRA-15454
Project: Cassandra
Issue Type: Bug
Components: Cluster/Schema
Reporter: Aleksey Yeschenko
Assignee: Aleksey Yeschenko
In 4.0, we set {{memtable_flush_period_in_ms}} to 0 (from 1 hour previously),
and changed default chunk length from 64KiB to 16KiB. On startup we would try
to override existing schema definitions for {{system_traces}},
{{system_distributed}}, and {{system_auth}} to reflect these changes, but
because these are changes to smaller values, while timestamps remain the same,
these will never override existing, pre-upgrade values from 3.0 or 3.11. As a
result, a schema migration request will be pushed by a node on every bounce to
every replica, causing unnecessary and ultimately fruitless work.
Bumping the generations fixes the issue, and documenting the changes doesn't
hurt either.
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