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https://issues.apache.org/jira/browse/CASSANDRA-15398?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aleksey Yeschenko updated CASSANDRA-15398:
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Reviewers: Sam Tunnicliffe
> Fix system_traces creation timestamp; optimise system keyspace upgrades
> -----------------------------------------------------------------------
>
> Key: CASSANDRA-15398
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15398
> Project: Cassandra
> Issue Type: Bug
> Components: Cluster/Schema
> Reporter: Aleksey Yeschenko
> Assignee: Aleksey Yeschenko
> Priority: Normal
> Fix For: 4.0, 3.0.x, 3.11.x
>
>
> We have introduced changes to system_traces tables in 3.0 (removal of
> default_time_to_live, lowering of bloom_filter_fp_chance). We did not,
> however, bump the timestamp with which we add the tables to schema, still
> defaulting to 0. As a result, for clusters that upgraded from 2.1/2.2, on
> bounce we would always detect a mismatch between actual and desired table
> definitions, always try to reconcile it by issuing migration tasks, but have
> them never override the existing definitions in place.
> Additionally, prior to 2.0.2 (CASSANDRA-6016) we’d use a ‘real’ timestamp, so
> for clusters that started on even earlier versions of C* (say, 1.2), a bump
> to the timestamp by 1 would be insufficient, and a larger generation is
> necessary (I picked Jan 1 2020 as cut-off date).
> The patch also optimises the process of upgrading replicated system tables.
> Instead of issuing a migration task for every table that changed for every
> node, we batch all changes into a single schema migration task.
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