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From Lucifer Dignified <vineetdan...@gmail.com>
Subject Re: How many KeySpace will you use in a single application?
Date Sun, 11 Apr 2010 08:04:25 GMT
Dop

You can help us all by sharing your experiences here, so that new users dont
face the same problem :
A group to bring all HA force together (help the effort)

http://www.facebook.com/groups/edit.php?edit_members&gid=116428271708033#!/group.php?gid=116428271708033


On Sat, Apr 10, 2010 at 8:19 PM, Dop Sun <sunht@dopsun.com> wrote:

> So, if my understanding is correct, in this case, the small replication
> factor key space is a online back system, or BCP environment. :)
>
> Very good one. Actually, one of the things which make me a little bit
> uncomfortable is BCP: once something goes wrong, how to take it back? In the
> traditional RDBS world, there are lot of documented practices and procedures
> to follow to make it happen. As a relative new and improving technology,
> these stuff is very limited. (even google cannot help at the moment. :-))
>
> Regards,
> Dop
>
> -----Original Message-----
> From: Benoit Perroud [mailto:benoit@noisette.ch]
> Sent: Saturday, April 10, 2010 5:48 PM
> To: user@cassandra.apache.org
> Subject: Re: How many KeySpace will you use in a single application?
>
> One point in using several keyspaces is that replication factor is per
> keyspace.
>
> If you have a part of your application which generate a lot of data
> whoss can be lost (some non critical logs?), then a dedicated keyspace
> with a smaller replication factor can be a good thing.
>
> Kind regards,
>
> Benoit.
>
> 2010/4/10 Dop Sun <sunht@dopsun.com>:
> > Hi, a question troubles me now: how many KeySpaces one application is
> better
> > to use?
> >
> >
> >
> > The question is coming out since 0.6, Cassandra introduced a new API
> named
> > as “login”, which is done against a specific keySpace. Thanks to the
> > org.apache.cassandra.auth.AllowAllAuthenticator, the old version clients
> can
> > still work without authentication.
> >
> >
> >
> > Actually, while I’m working with the previous version, I just take the
> > KeySpace as another level of the whole structure, KeySpace – ColumnFamily
> –
> > Super Column (optional) – Column – Value.  And consider the whole
> Cassandra
> > cluster as the root of all these, and one application controls everything
> > under this cluster.
> >
> >
> >
> > Now, looks like I need to re-think this and put the KeySpace as a kind of
> > root. It may be better to make one application only takes one KeySpace (a
> > silly question? Since all old time, one application usually uses only one
> > database, but forgive me, I may abuses the flexibility of Cassandra.)? Is
> > there any pros or cons to user multiple key spaces vs. single key spaces,
> > other than the authentication requirements?
> >
> >
> >
> > Can anyone give me some suggestions on this?
> >
> >
> >
> > Dop
>
>
>

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