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https://issues.apache.org/jira/browse/CASSANDRA-4493?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13450005#comment-13450005
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Jonathan Ellis commented on CASSANDRA-4493:
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+1
                
> Fix update of CF comparator (including adding new collections)
> --------------------------------------------------------------
>
>                 Key: CASSANDRA-4493
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4493
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Sylvain Lebresne
>            Assignee: Sylvain Lebresne
>             Fix For: 1.2.0
>
>         Attachments: 0001-Flush-after-CFStore-reload.txt, 
> 0002-Fix-ALTER-logic.txt
>
>
> Updating the comparator of a column family (which is authorized if the new 
> comparator is "compatible" with the old one, and that includes adding a new 
> component to a CompositeType, or adding a new collection to a CQL3 table) 
> doesn't completely work. The problem is that even if we change the comparator 
> in CFMetada, the old comparator will still be aliased by the current 
> memtable. This means updates (that expect the new comparator) will fail until 
> a new memtable is created.

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