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From Jonathan Haddad <...@jonhaddad.com>
Subject Re: is there any type of table existing on all nodes(slow to up date, fast to read in map/reduce)?
Date Fri, 13 Sep 2013 19:50:42 GMT
You could create a bunch of 1 node DCs if you really wanted it.


On Fri, Sep 13, 2013 at 12:29 PM, Hiller, Dean <Dean.Hiller@nrel.gov> wrote:

> Actually, I have been on a few projects where something like that is
> useful.  Gemfire(a grid memory cache) had that feature which we used at
> another company.  On every project I encounter, there is usually one small
> table somewhereĆ .either meta data or something that is infrequently
> changing and nice to duplicate on every node.  I bet eventually nosql
> stores may start to add it maybe in a few years, but I guess we are not
> there yet.
>
> Thanks,
> Dean
>
> On 9/13/13 12:24 PM, "Jon Haddad" <jon@jonhaddad.com> wrote:
>
> >It sounds some something that's only useful in a really limited use case.
> > In an 11 node cluster it would be quorum reads / writes would need to
> >come from 6 nodes.  It would probably be much slower for both reads &
> >writes.
> >
> >It sounds like what you want is a database with replication, not
> >partitioning.
> >
> >On Sep 13, 2013, at 11:15 AM, "Hiller, Dean" <Dean.Hiller@nrel.gov>
> wrote:
> >
> >> When I add nodes though, I would kind of be screwed there, right?  Is
> >>there an RF=${nodecount}Ć that would be neat.
> >>
> >> Dean
> >>
> >> From: Robert Coli <rcoli@eventbrite.com<mailto:rcoli@eventbrite.com>>
> >> Reply-To: "user@cassandra.apache.org<mailto:user@cassandra.apache.org>"
> >><user@cassandra.apache.org<mailto:user@cassandra.apache.org>>
> >> Date: Friday, September 13, 2013 12:06 PM
> >> To: "user@cassandra.apache.org<mailto:user@cassandra.apache.org>"
> >><user@cassandra.apache.org<mailto:user@cassandra.apache.org>>
> >> Subject: Re: is there any type of table existing on all nodes(slow to
> >>up date, fast to read in map/reduce)?
> >>
> >> On Fri, Sep 13, 2013 at 10:47 AM, Hiller, Dean
> >><Dean.Hiller@nrel.gov<mailto:Dean.Hiller@nrel.gov>> wrote:
> >> I was just wondering if cassandra had any special CF that every row
> >>exists on every node for smaller tables that we would want to leverage
> >>in map/reduce.  The table row count is less than 500k and we are ok with
> >>slow updates to the table, but this would make M/R blazingly fast since
> >>for every row, we read into this table.
> >>
> >> Create a keyspace with replication configured such that RF=N?
> >>
> >> =Rob
> >
>
>


-- 
Jon Haddad
http://www.rustyrazorblade.com
skype: rustyrazorblade

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