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From CHAUMIER, RAPHAËL <RACHA...@bouyguestelecom.fr>
Subject RE: cassandra documentation (Multiple datacenter write requests) question
Date Tue, 22 Nov 2016 16:14:46 GMT
Ok,

I submitted to datastax my question.

Regards,
Raphaël CHAUMIER

De : Vladimir Yudovin [mailto:vladyu@winguzone.com]
Envoyé : mardi 22 novembre 2016 16:59
À : user <user@cassandra.apache.org>
Objet : RE: cassandra documentation (Multiple datacenter write requests) question

Is Apache Cassandra community can update this documentation ?
I don't think so, it's hosted on DataStax website and it's not public Wiki.

Anyway you know what is right quorum calculation  formula is ))).

Best regards, Vladimir Yudovin,
Winguzone<https://winguzone.com?from=list> - Hosted Cloud Cassandra
Launch your cluster in minutes.


---- On Tue, 22 Nov 2016 09:01:32 -0500CHAUMIER, RAPHAËL <RACHAUMI@bouyguestelecom.fr<mailto:RACHAUMI@bouyguestelecom.fr>>
<RACHAUMI@bouyguestelecom.fr<mailto:RACHAUMI@bouyguestelecom.fr>> wrote ----

Thank you Hannu,

Is Apache Cassandra community can update this documentation ?

De : Hannu Kröger [mailto:hkroger@gmail.com<mailto:hkroger@gmail.com>]
Envoyé : mardi 22 novembre 2016 14:48
À : user@cassandra.apache.org<mailto:user@cassandra.apache.org>
Objet : Re: cassandra documentation (Multiple datacenter write requests) question

Looks like the graph is wrong.

Hannu

On 22 Nov 2016, at 15.43, CHAUMIER, RAPHAËL <RACHAUMI@bouyguestelecom.fr<mailto:RACHAUMI@bouyguestelecom.fr>>
wrote:

Hello everyone,

I don’t know if you have access to DataStax documentation. I don’t understand the example
about Multiple datacenter write requests (http://docs.datastax.com/en/cassandra/3.0/cassandra/dml/dmlClientRequestsMultiDCWrites.html).
The graph shows there’s 3 nodes making up of QUORUM, but based on the quorum computation
rule (http://docs.datastax.com/en/cassandra/3.0/cassandra/dml/dmlConfigConsistency.html#dmlConfigConsistency__about-the-quorum-level)

quorum = (sum_of_replication_factors / 2) + 1

sum_of_replication_factors = datacenter1_RF + datacenter2_RF + . . . + datacentern_RF

If I have 2 DC of 3 replica nodes so the quorum should be = ( 3+3 /2) +1 = (6/2) + 1 = 3 +
1 = 4

Am I missing something ?

Thanks for your response.

Regards,


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