[jira] [Updated] (CASSANDRA-6038) Support schema changes in mixed version clusters

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

     [ https://issues.apache.org/jira/browse/CASSANDRA-6038?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aleksey Yeschenko updated CASSANDRA-6038:
-----------------------------------------
    Summary: Support schema changes in mixed version clusters  (was: Make the inter-major schema migration barrier more targeted, and, ideally, non-existent)

> Support schema changes in mixed version clusters
> ------------------------------------------------
>
>                 Key: CASSANDRA-6038
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6038
>             Project: Cassandra
>          Issue Type: Sub-task
>            Reporter: Aleksey Yeschenko
>            Assignee: Aleksey Yeschenko
>              Labels: client-impacting
>             Fix For: 3.x
>
>
> CASSANDRA-5845 made it so that schema changes in a major-mixed cluster are not propagated to the minorer-major nodes. This lets us perform backwards-incompatible schema changes in major releases safely - like adding the schema_triggers table, moving all the aliases to schema_columns, getting rid of the deprecated schema columns, etc.
> Even this limitation might be too strict, however, and should be avoided if possible (starting with at least versioning schema separately from messaging service versioning, and resorting to major->minor schema block only when truly necessary and not for every x->y pair). 



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