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From Jonathan Ellis <jbel...@gmail.com>
Subject Re: ColumnFamilyInputFormat KeyRange scans on a CF
Date Fri, 30 Apr 2010 13:22:42 GMT
Sounds like doing this w/o m/r with get_range_slices is a reasonable way to go.

On Thu, Apr 29, 2010 at 6:04 PM, Utku Can Topçu <utku@topcu.gen.tr> wrote:
> I'm currently writing collected data continuously to Cassandra, having keys
> starting with a timestamp and a unique identifier (like
> 2009.01.01.00.00.00.RANDOM) for being able to query in time ranges.
>
> I'm thinking of running periodical mapreduce jobs which will go through a
> designated time period. I might want to analyze the data only between
> 2009.01 and 2009.02.
> I had done this previously with HBase however I thought cassandra would be a
> better choice for continuously storing data in a safe manner.
>
> I guess this briefly explains my designated use case.
>
> Best Regards,
> Utku
>
> On Thu, Apr 29, 2010 at 11:32 PM, Jonathan Ellis <jbellis@gmail.com> wrote:
>>
>> It's technically possible but 0.6 does not support this, no.
>>
>> What is the use case you are thinking of?
>>
>> On Thu, Apr 29, 2010 at 11:14 AM, Utku Can Topçu <utku@topcu.gen.tr>
>> wrote:
>> > Hi,
>> >
>> > I've been trying to use Cassandra for some kind of a supplementary input
>> > source for Hadoop MapReduce jobs.
>> >
>> > The default usage of the ColumnFamilyInputFormat does a full
>> > columnfamily
>> > scan for using within the MapReduce framework as map input.
>> >
>> > However I believe that, it should be possible to give a keyrange to scan
>> > the
>> > specified range.
>> >
>> > Is it anymeans possible?
>> >
>> > Best 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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