cassandra-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From David Boxenhorn <da...@lookin2.com>
Subject Re: key is sorted?
Date Sun, 09 May 2010 13:08:34 GMT
Thanks!

I just wanted to be extra sure about that....

On Sun, May 9, 2010 at 3:54 PM, Shinpei Ohtani <shinpei.ohtani@gmail.com>wrote:

> > 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)
>
> =============================
>

Mime
View raw message