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From "Jonathan Ellis (Resolved) (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (CASSANDRA-1537) Add option (on CF) to remove expired column on minor compactions
Date Thu, 15 Dec 2011 20:01:31 GMT

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

Jonathan Ellis resolved CASSANDRA-1537.
---------------------------------------

       Resolution: Won't Fix
    Fix Version/s:     (was: 1.1)
         Assignee:     (was: Sylvain Lebresne)

This doesn't seem urgent or useful enough to justify adding more options and complexity to
the TTL code.
                
> 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
>            Priority: Minor
>   Original Estimate: 8h
>  Remaining Estimate: 8h
>
> 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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