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From Bryan Talbot <btal...@aeriagames.com>
Subject Re: In a multiple data center setup, do all the data centers have complete data irrespective of RF?
Date Mon, 20 May 2013 15:26:44 GMT
Option #3 since it depends on the placement strategy and not the
partitioner.

-Bryan



On Mon, May 20, 2013 at 6:24 AM, Pinak Pani <
nishant.has.a.question@gmail.com> wrote:

> I just wanted to verify the fact that if I happen to setup a multi
> data-center Cassandra setup, will each data center have the complete
> data-set with it?
>
> Say, I have two data-center each with two nodes, and a partitioner that
> ranges from 0 to 100. Initial token assigned this way
>
> DC1:N1 = 00
> DC2:N1 = 25
> DC1:N2 = 50
> DC2:N2 = 75
>
> where DCX is data center X, NX is node X. *Which one the following
> options is true?*
>
> *Option #1: *DC1 and DC2, each will hold complete dataset with keys
> bucketed as follows
> DC1:N1 = (50, 00] => 50 keys
> DC1:N2 = (00, 50] => 50 keys
> ----
> Complete data set mirrored at DC1
>
> DC2:N1 = (75, 25] => 50 keys
> DC2:N2 = (25, 75] => 50 keys
> ----
> Complete data set mirrored at DC2
>
> *Option #2: *DC1 and DC2, each will hold 50% of the data with keys
> bucketed as follows (much the same way in a single C setup)
> DC1:N1 = (75, 00] => 25 keys
> DC2:N1 = (00, 25] => 25 keys
> DC1:N2 = (25, 50] => 25 keys
> DC2:N2 = (50, 75] => 25 keys
> ----
> data is divided into the two data centers.
>
> Thanks,
> PP
>

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