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From Kant Kodali <k...@peernova.com>
Subject Re: quick questions
Date Sun, 18 Dec 2016 00:49:17 GMT
@Matjia I think you either did not understand my question or I failed to
explain it more clearly.

On Sat, Dec 17, 2016 at 4:46 PM, Matija Gobec <matija0204@gmail.com> wrote:

> QUORUM is by documentation:
>
> quorum = (sum_of_replication_factors / 2) + 1
>
> Its not fixed value (as 4).
>
> On Sat, Dec 17, 2016 at 10:21 PM, Kant Kodali <kant@peernova.com> wrote:
>
>> I keep hearing that the minimum number of Cassandra nodes required to
>> achieve Quorum consensus is 4 I wonder why not 3? In fact, many container
>> deployments by default seem to deploy 4 nodes. Can anyone shine some light
>> on this?
>>
>> What happens if I have 3 nodes and replication factor of 3 and
>> consistency level: quorum? I should be able to achieve quorum level
>> consensus right.
>>
>> If Total node = 3, RF=2 and consistency level = Quorum. Then I understand
>> the quorum level consensus is not possible because the number of replica
>> nodes here are 2.
>> This also brings up another question does number of replica nodes always
>> have to be an odd number to achieve quorum level consensus? If so, what
>> happens when a replica node goes down ? it would still serve the requests
>> but the quorum level consensus is not possible?
>>
>> Thanks
>> kant
>>
>>
>>
>>
>>
>>
>

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