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https://issues.apache.org/jira/browse/CASSANDRA-17044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17433708#comment-17433708
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Alex Petrov commented on CASSANDRA-17044:
-----------------------------------------

[~benedict] you're right. My thinking was that since it's a Listener, there 
might be implementations outside the codebase, but I agree we should always 
move towards what's most useful for Cassandra today. This, then, also applies 
to the API introduced in this patch: if changes introducing consistent schema 
require changes in this API, we will have to make changes to it.

> Refactor schema management to allow for schema source pluggability
> ------------------------------------------------------------------
>
>                 Key: CASSANDRA-17044
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-17044
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Cluster/Schema
>            Reporter: Jacek Lewandowski
>            Assignee: Jacek Lewandowski
>            Priority: Normal
>
> The idea is decompose `Schema` into separate entities responsible for 
> different things. In particular extract what is related to schema storage and 
> synchronization into a separate class so that it is possible to create an 
> extension point there and store schema in a different way than 
> `system_schema` keyspace, for example in etcd. 
> This would also simplify the logic and reduce the number of special cases, 
> make all the things more testable and the logic of internal classes 
> encapsulated.



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