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From alta...@ceid.upatras.gr
Subject Re: Cassandra Multiple DataCenter Suitability - why?
Date Fri, 18 Jun 2010 06:51:01 GMT
Alright, I thought I'd post it here because it has to do with Cassandra
internals. I will repost it correctly.

Alexander
>
> Jonathan Shook
> On Thu, 17 Jun 2010 12:58:34 -0700
> This is a (yet another) question for the users list.
>
> On Jun 17, 2010 12:50 PM, <alta...@ceid.upatras.gr> wrote:
>
>> Hello,
>>
>> I keep reading everywhere that Cassandra has supported multiple
>> datacenters from the beginning. I would like to know what does Cassandra
>> do to achieve that. Is it just that the developers have written some
>> code
>> that supports that scenario, or is there something inherent in
>> Cassandra's
>> design that is suitable for a multi DC environment, like minimizing
>> inter-DC traffic?
>>
>> I have read about RackAwareStrategy on the wiki, and have also browsed
>> through some code (DataCenterShardStrategy), but I would like to see
>> what
>> people have to say about this.
>>
>> I also read about an implemenetation of Rack Awareness employing
>> Zookeeper, but I gather that wasn't released by Facebook and it was more
>> geared towards single-DC rack awareness because Zookeeper is a bit heavy
>> on the bandwidth.
>>
>> Anyway, just to sum it up, my question is this: please explain in brief
>> the reasons why Cassandra is well suited for multi-DC environments.
>>
>> Alexander Altanis
>>
>
>


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