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From Shinpei Ohtani <shinpei.oht...@gmail.com>
Subject Re: key is sorted?
Date Sun, 09 May 2010 12:54:00 GMT
> But you will get all the keys, right?

Yes.

On Sun, May 9, 2010 at 9:45 PM, David Boxenhorn <david@lookin2.com> wrote:
> But you will get all the keys, right?
>
> I want to get all the keys, but I don't care about the order.
>
> On Sun, May 9, 2010 at 3:25 PM, Shinpei Ohtani <shinpei.ohtani@gmail.com>
> wrote:
>>
>> Hi,
>>
>> > If you use random partitioning, you can loop through all keys with a
>> > range
>> > query, but they will not be sorted.
>> >
>> > True or False?
>>
>> I think they will be sorted in a way of MD5 hash if you use
>> RandomPartitioner,
>> at least I looked into SSTables and RandomPartitioner#getToken.
>>
>> On Sun, May 9, 2010 at 4:00 PM, David Boxenhorn <david@lookin2.com> wrote:
>> > This is something that I'm not sure that I understand. Can somebody
>> > confirm/deny that I understand it? Thanks.
>> >
>> > If you use random partitioning, you can loop through all keys with a
>> > range
>> > query, but they will not be sorted.
>> >
>> > True or False?
>> >
>> > On Sat, May 8, 2010 at 3:45 AM, AJ Chen <ajchen@web2express.org> wrote:
>> >>
>> >> thanks, that works. -aj
>> >>
>> >> On Fri, May 7, 2010 at 1:17 PM, Stu Hood <stu.hood@rackspace.com>
>> >> wrote:
>> >>>
>> >>> Your IPartitioner implementation decides how the row keys are sorted:
>> >>> see
>> >>> http://wiki.apache.org/cassandra/StorageConfiguration#Partitioner .
>> >>> You need
>> >>> to be using one of the OrderPreservingPartitioners if you'd like a
>> >>> reasonable order for the keys.
>> >>>
>> >>> -----Original Message-----
>> >>> From: "AJ Chen" <ajchen@web2express.org>
>> >>> Sent: Friday, May 7, 2010 3:10pm
>> >>> To: user@cassandra.apache.org
>> >>> Subject: key is sorted?
>> >>>
>> >>> I have a super column family for "topic", key being the name of the
>> >>> topic.
>> >>> <ColumnFamily Name="Topic" CompareWith="UTF8Type" ColumnType="Super"
>> >>> CompareSubcolumnsWith="BytesType" />
>> >>> When I retrieve the rows, the rows are not sorted by the key. Is the
>> >>> row
>> >>> key
>> >>> sorted in cassandra by default?
>> >>>
>> >>> -aj
>> >>> --
>> >>> AJ Chen, PhD
>> >>> Chair, Semantic Web SIG, sdforum.org
>> >>> http://web2express.org
>> >>> twitter @web2express
>> >>> Palo Alto, CA, USA
>> >>>
>> >>>
>> >>
>> >>
>> >>
>> >> --
>> >> AJ Chen, PhD
>> >> Chair, Semantic Web SIG, sdforum.org
>> >> http://web2express.org
>> >> twitter @web2express
>> >> Palo Alto, CA, USA
>> >
>> >
>>
>>
>>
>> --
>> =============================
>> Shinpei Ohtani
>> mail    : shinpei.ohtani@gmail.com
>> blog    : http://d.hatena.ne.jp/shot6/
>> twitter : http://twitter.com/shot6
>> =============================
>
>



-- 
=============================
Shinpei Ohtani
mail    : shinpei.ohtani@gmail.com
blog    : http://d.hatena.ne.jp/shot6/
twitter : http://twitter.com/shot6 (japanese)
            http://twitter.com/shinpei_ohtani (english)

=============================

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