[jira] [Created] (CASSANDRA-6038) Make the inter-major schema migration barrier more targeted, and, ideally, non-existent

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

Aleksey Yeschenko created CASSANDRA-6038:
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             Summary: Make the inter-major schema migration barrier more targeted, and, ideally, non-existent
                 Key: CASSANDRA-6038
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6038
             Project: Cassandra
          Issue Type: Improvement
            Reporter: Aleksey Yeschenko
             Fix For: 2.1


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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