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From Jonathan Ellis <jbel...@gmail.com>
Subject Re: A proposed use case, any comments and experience is appreciated
Date Mon, 04 Oct 2010 13:51:08 GMT
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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