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Posted to user@cassandra.apache.org by Jeremiah Jordan <JE...@morningstar.com> on 2010/09/14 16:51:15 UTC

Removing Data

Is setting a value to '' the same as deleting it in terms of disk space
being free'd?  Will it still take gc_grace_seconds for the old data to
be removed from disk?

-Jeremiah
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Re: Removing Data

Posted by Jonathan Ellis <jb...@gmail.com>.

On Tue, Sep 14, 2010 at 9:51 AM, Jeremiah Jordan
<JE...@morningstar.com> wrote:
> Is setting a value to ‘’ the same as deleting it in terms of disk space
> being free’d?

no, you're saying "preserve that column X has an empty value, forever."

>  Will it still take gc_grace_seconds for the old data to be
> removed from disk?

No.  (It will take until it happens to be obsoleted by compaction.)

-- 
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support
http://riptano.com