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From Maki Watanabe <watanabe.m...@gmail.com>
Subject Re: Using cassandra at minimal expenditures
Date Wed, 29 Feb 2012 01:53:20 GMT
If you have 3 nodes of RF=3, you can continue the service on cassandra even if
one of the node will fail ( by hardware or software failure ).
One other benefit is you can shutdown one node for maintenance or patch up
without service interruption.

If you run your service with 2 node and RF=2, your data will be replicated but
your service will not be redundant. ( You can't stop both of nodes )

2012/2/29 Ertio Lew <ertiop93@gmail.com>:
> @Aaron: Are you suggesting 3 nodes (rather than 2) to allow quorum
> operations even at the temporary loss of 1 node from cluster's reach ? I
> understand this but I just another question popped up in my mind, probably
> since I'm not much experienced managing cassandra, so I'm unaware whether it
> may be a usual case that some out of n nodes of my cluster may be
> down/unresponsive or out of cluster reach? (I, actually, considered this
> situation like exceptional circumstance not normal one !?)
>
>
> On Tue, Feb 28, 2012 at 2:34 AM, aaron morton <aaron@thelastpickle.com>
> wrote:
>>
>> 1. I am wandering what is the minimum recommended cluster size to start
>> with?
>>
>> IMHO 3
>> http://thelastpickle.com/2011/06/13/Down-For-Me/
>>
>> A
>>
>> -----------------
>> Aaron Morton
>> Freelance Developer
>> @aaronmorton
>> http://www.thelastpickle.com
>>
>> On 28/02/2012, at 8:17 AM, Ertio Lew wrote:
>>
>> Hi
>>
>> I'm creating an networking site using cassandra. I am wanting to host this
>> application but initially with the lowest possible resources & then slowly
>> increasing the resources as per the service's demand & need.
>>
>> 1. I am wandering what is the minimum recommended cluster size to start
>> with?
>> Are there any issues if I start with as little as 2 nodes in the cluster?
>> In that case I guess would have replication factor of 2.
>> (this way I would require at min. 3 vps, 1 as web server & the 2 for
>> cassandra cluster, right?)
>>
>> 2. Anyone using cassandra with such minimal resources in
>> production environments ? Any experiences or difficulties encountered ?
>>
>> 3. In case, you would like to recommend some hosting service suitable for
>> me ? or if you would like to suggest some other ways to minimize the
>> resources (actually the hosting expenses).
>>
>>
>



-- 
maki

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