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https://issues.apache.org/jira/browse/CASSANDRA-17372?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17490483#comment-17490483
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Brandon Williams commented on CASSANDRA-17372:
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I suspect if we disallowed any other ttl-specified writes (and possibly even
deletes) that could simplify the logic enough to make this easier to do.
> Dynamic Table TTL
> -----------------
>
> Key: CASSANDRA-17372
> URL: https://issues.apache.org/jira/browse/CASSANDRA-17372
> Project: Cassandra
> Issue Type: Improvement
> Components: CQL/Semantics
> Reporter: Paulo Motta
> Priority: Normal
>
> One limitation of the {{default_time_to_live}} option is that it only applies
> to newly inserted data so an expensive migration is required when altering
> the table-level TTL, which is not an uncommon request due to changes in
> retention policies.
> This seems to have been a deliberate design decision when adding the Table
> TTL feature on CASSANDRA-3974, due to the reasons stated [on this
> comment|https://issues.apache.org/jira/browse/CASSANDRA-3974?focusedCommentId=13427314&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-13427314]
> so we should revisit and potentially address these concerns.
> I would like to explore supporting dynamic TTL, which would reflect any
> updates to the table-level {{default_time_to_live}} immediately to all table
> data.
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