[jira] [Created] (CASSANDRA-15454) Update generations and update comments for altered distributed system keyspaces

["Aleksey Yeschenko (Jira)" <ji...@apache.org>]

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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