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https://issues.apache.org/jira/browse/CASSANDRA-5411?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13624026#comment-13624026
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Jonathan Ellis commented on CASSANDRA-5411:
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Would it be worth splitting hints out into per-CF objects?  Would be fairly 
simple in hintFor.
                
> Unexpired hints can potentially create previously deleted rows
> --------------------------------------------------------------
>
>                 Key: CASSANDRA-5411
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5411
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 1.1.10
>         Environment: Ubuntu 10.04
>            Reporter: Arya Goudarzi
>            Assignee: Brandon Williams
>
> Per discussion here: 
> http://www.mail-archive.com/user@cassandra.apache.org/msg28905.html
> Hints are TTLed to lowest gc_grace_seconds. If we have hints that are not 
> replayed, and the administrator updates schema to have lower gc_grace seconds 
> on some CF, chances are compactions will delete tombstones and history of 
> delete gets lost. If the deleted row is in some hints CF, since the TTL is 
> not updated, chances are it gets replayed and the deleted row comes back to 
> life. 
> I think it would be nice as part of schema migration, to also update the TTLs 
> on hints that already exists on any nodes hints column family. 

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