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From Jonathan Ellis <jbel...@gmail.com>
Subject Re: Cassandra and TTL
Date Tue, 12 Jan 2010 21:29:57 GMT
On Tue, Jan 12, 2010 at 2:39 PM, Sylvain Lebresne <sylvain@yakaz.com> wrote:
>> If truncating old sstables entirely
>> (https://issues.apache.org/jira/browse/CASSANDRA-531) meets your
>> needs, that is going to be less work and more performant.
>
> Well, I'm not sure I understand completely this ticket. The part in the
> comment saying "drop all sstables older than X" seems to be something helpful.
> But aren't sstables regularly merged together, thus mixing "older" data with
> newer data ?

Right, that is why the ticket says you would want to disable
compaction if you want to truncate less than the whole CF.

> That is, is this 'truncate with a timestamp t' always remove *all* columns
> with a timestamp older than t ?

Yes.

-Jonathan

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