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From mobiledream...@gmail.com
Subject Re: replica on in the beginning or added later
Date Tue, 14 Jul 2009 15:27:01 GMT
what is quorum for a key?

On Tue, Jul 14, 2009 at 8:25 AM, Jonathan Ellis <jbellis@gmail.com> wrote:

> Note that for N=2, quorum write is the same as block-for-all.  That is
> why N=3 is more popular, because it allows for one node to be down but
> still give you a quorum for any key.
>
> -Jonathan
>
> On Tue, Jul 14, 2009 at 10:22 AM, <mobiledreamers@gmail.com> wrote:
> > starting with replica count 2 is more prudent thanks
> >
> > On Tue, Jul 14, 2009 at 8:21 AM, Jonathan Ellis <jbellis@gmail.com>
> wrote:
> >>
> >> although the repair code Stu is working on
> >> (https://issues.apache.org/jira/browse/CASSANDRA-193) could handle
> >> increasing the replica count, IMO there's little sense in relying any
> >> more on features that don't yet exist than necessary. :)
> >>
> >> On Tue, Jul 14, 2009 at 10:17 AM, <mobiledreamers@gmail.com> wrote:
> >> > as a followup question
> >> > the items we are storing are extremely valuable and we are using
> >> > cassandra
> >> > as a sql replacement tool.. ie no more postgres and all data from
> >> > cassandra,
> >> > given cassandra scalability
> >> > as we hit limits on postgres and found pgpool-II horizontal
> partitioning
> >> > too
> >> > clunky and skype, plproxy requires too much rewiring the client code.
> >> > should we start with a replica factor 1 and then increase replica
> factor
> >> > to
> >> > 2
> >> > or is is prudent to start with a replica factor of 2
> >> > Can cassandra replicate even after running for a long time with a
> >> > replica
> >> > factor of 1, if we change the replica factor to say 2 after 2months
> when
> >> > we
> >> > add more nodes and figure there is enough space now to replicate
> >> > thanks
> >> >
> >> > --
> >> > Bidegg worlds best auction site
> >> > http://bidegg.com
> >> >
> >
> >
> >
> > --
> > Bidegg worlds best auction site
> > http://bidegg.com
> >
>



-- 
Bidegg worlds best auction site
http://bidegg.com

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