[jira] Updated: (CASSANDRA-1537) Add option (on CF) to remove expired column on minor compactions

["Jonathan Ellis (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-1537?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jonathan Ellis updated CASSANDRA-1537:
--------------------------------------

    Fix Version/s:     (was: 0.7.1)

> Add option (on CF) to remove expired column on minor compactions
> ----------------------------------------------------------------
>
>                 Key: CASSANDRA-1537
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1537
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 0.7.1
>            Reporter: Sylvain Lebresne
>            Assignee: Sylvain Lebresne
>            Priority: Minor
>
> In some use cases, you can safely remove the tombstones of an expired column.
> In theory, this is true in each case where you know that you will never update a column 
> using a ttl strictly lesser that the one of the old column.
> This will be the case for instance if you always use the same ttl on all the columns of a CF
> (say you use the CF for a long term persistent cache).
> I propose adding an option (by CF) that says 'always remove tombstone of expired columns
> for that CF'.  

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