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https://issues.apache.org/jira/browse/CASSANDRA-15454?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aleksey Yeschenko updated CASSANDRA-15454:
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Test and Documentation Plan: N/A
Status: Patch Available (was: Open)
> 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
> Priority: Normal
> Fix For: 4.0
>
>
> 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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