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https://issues.apache.org/jira/browse/CASSANDRA-11071?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15119182#comment-15119182
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Aleksey Yeschenko commented on CASSANDRA-11071:
-----------------------------------------------

[~mikea] This is just cosmetic, right? I don't think there was any reason. It's 
just a minor oversight.

> Invalidate legacy schema CFSs at startup
> ----------------------------------------
>
>                 Key: CASSANDRA-11071
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-11071
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Distributed Metadata, Lifecycle
>            Reporter: Sam Tunnicliffe
>            Assignee: Mike Adamson
>            Priority: Minor
>             Fix For: 3.0.x, 3.x
>
>
> {{ColumnFamilyStore}} instances are created for legacy schema tables at 
> startup when {{SystemKeyspace}} is initialized as they may be required for 
> schema migration during upgrade. Before startup completes, the schema info 
> for these is expunged from {{system_schema}}, but the {{CFS}} instances are 
> not invalidated, which leaves their mbeans registered and visible via 
> nodetool & JMX.



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