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From Utku Can Topçu <u...@topcu.gen.tr>
Subject Re: A proposed use case, any comments and experience is appreciated
Date Mon, 04 Oct 2010 14:00:10 GMT
What I can understand from "behaving like a deleted" column is
- They'll be there for at most GCGraceSeconds?

On Mon, Oct 4, 2010 at 3:51 PM, Jonathan Ellis <jbellis@gmail.com> wrote:

> Expiring columns are 0.7 only.
>
> An expired column behaves like a deleted column until it is compacted away.
>
> On Mon, Oct 4, 2010 at 8:48 AM, Utku Can Topçu <utku@topcu.gen.tr> wrote:
> > Hi Jonathan,
> >
> > Thank you for mentioning about the expiring columns issue. I didn't know
> > that it had existed.
> > That's really great news.
> > First of all, does the current 0.6 branch support it? If not so, is the
> > patch available for the 0.6.5 somehow?
> > And about the deletion issue, if all the columns in a row expire? When
> the
> > row will be deleted, will I be seeing the row in my map inputs somehow,
> and
> > for how long?
> >
> > Regards,
> > Utku
> >
> > On Mon, Oct 4, 2010 at 3:30 PM, Jonathan Ellis <jbellis@gmail.com>
> wrote:
> >>
> >> A simpler approach might be to insert expiring columns into a 2nd CF
> >> with a TTL of one hour.
> >>
> >> On Mon, Oct 4, 2010 at 5:12 AM, Utku Can Topçu <utku@topcu.gen.tr>
> wrote:
> >> > Hey All,
> >> >
> >> > I'm planning to run Map/Reduce on one of the ColumnFamilies. The keys
> >> > are
> >> > formed in such a fashion that, they are indexed in descending order by
> >> > time.
> >> > So I'll be analyzing the data for every hour iteratively.
> >> >
> >> > Since the current Hadoop integration does not support partial
> >> > columnfamily
> >> > analysis. I feel that, I'll need to dump the data of the last hour and
> >> > put
> >> > it to the hadoop cluster and do my analysis on the flat text file.
> >> > Do you think of any other "better" way of getting the data of a
> keyrange
> >> > into a hadoop cluster for analysis?
> >> >
> >> > Regards,
> >> >
> >> > Utku
> >> >
> >> >
> >> >
> >>
> >>
> >>
> >> --
> >> Jonathan Ellis
> >> Project Chair, Apache Cassandra
> >> co-founder of Riptano, the source for professional Cassandra support
> >> http://riptano.com
> >
> >
>
>
>
> --
> Jonathan Ellis
> Project Chair, Apache Cassandra
> co-founder of Riptano, the source for professional Cassandra support
> http://riptano.com
>

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