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Posted to commits@cassandra.apache.org by "Aleksey Yeschenko (Jira)" <ji...@apache.org> on 2019/12/16 11:09:00 UTC
[jira] [Updated] (CASSANDRA-15454) Update generations and update
comments for altered distributed system keyspaces
[ https://issues.apache.org/jira/browse/CASSANDRA-15454?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Aleksey Yeschenko updated CASSANDRA-15454:
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Bug Category: Parent values: Degradation(12984)
Complexity: Low Hanging Fruit
Discovered By: Code Inspection
Fix Version/s: 4.0
Reviewers: Sam Tunnicliffe
Severity: Low
Status: Open (was: Triage Needed)
> 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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