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From Jonathan Ellis <jbel...@gmail.com>
Subject Re: Question about cassandra (replication)
Date Thu, 25 Jun 2009 14:17:42 GMT
Rather than post the same question verbatim, it would be more useful
if you explained what you still don't understand after Alexander and
Sandeep's explanations on the google group.

(http://groups.google.com/group/cassandra-user/browse_thread/thread/4330e415e959e9d9)

On Thu, Jun 25, 2009 at 9:11 AM, Harold Lim<rold_50@yahoo.com> wrote:
>
> Hi All,
>
> I posted a similar message on the google groups page. Hopefully, I'll get more feedback
here.
>
>
> I just started reading about dynamo and Cassandra and I am thinking
> about possibly using cassandra for my system.
>
> I was reading the dynamo paper and they mentioned about a preference
> list for a particular key. Is this preference list configurable?
>
> How does Cassandra choose which nodes are in the preference list?
> Also, are the number of replica for each key/column configurable? For
> example, can I set the replication factor per key/value?
>
> I read that Cassandra has optimistic replication. What exactly does
> that mean? Underneath the hood, how does cassandra maintain/detect the
> number of replicas? Does it aggressively replicates an item, when it
> detects that the number of replica of a particular item goes below the
> specified repliation factor?
>
> Is the replication strategy (when to replicate, aggresiveness, etc)
> configurable too?
>
>
>
>
>
>
> Thanks,
> Harold
>
>
>
>

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