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From Alain RODRIGUEZ <arodr...@gmail.com>
Subject Re: Adding datacenter and data verification
Date Mon, 17 Sep 2018 15:41:26 GMT
Hello Pradeep,

It looks good to me and it's a cool runbook for you to follow and for
others to reuse.

To make sure that cassandra nodes in one datacenter can see the nodes of
> the other datacenter, add the seed node of the new datacenter in any of the
> old datacenter’s nodes and restart that node.


Nodes seeing each other from the distinct rack is not related to seeds.
It's indeed recommended to use seeds from all the datacenter (a couple or
3). I guess it's to increase availability on seeds node and/or maybe to
make sure local seeds are available.

You can perfectly (and even have to) add your second datacenter nodes using
seeds from the first data center. A bootstrapping node should never be in
the list of seeds unless it's the first node of the cluster. Add nodes,
then make them seeds.


Le lun. 17 sept. 2018 à 11:25, Pradeep Chhetri <pradeep@stashaway.com> a
écrit :

> Hello everyone,
>
> Can someone please help me in validating the steps i am following to
> migrate cassandra snitch.
>
> Regards,
> Pradeep
>
> On Wed, Sep 12, 2018 at 1:38 PM, Pradeep Chhetri <pradeep@stashaway.com>
> wrote:
>
>> Hello
>>
>> I am running cassandra 3.11.3 5-node cluster on AWS with SimpleSnitch. I
>> was testing the process to migrate to GPFS using AWS region as the
>> datacenter name and AWS zone as the rack name in my preprod environment and
>> was able to achieve it.
>>
>> But before decommissioning the older datacenter, I want to verify that
>> the data in newer dc is in consistence with the one in older dc. Is there
>> any easy way to do that.
>>
>> Do you suggest running a full repair before decommissioning the nodes of
>> older datacenter ?
>>
>> I am using the steps documented here: https://medium.com/p/465e9bf28d99
>> I will be very happy if someone can confirm me that i am doing the right
>> steps.
>>
>> Regards,
>> Pradeep
>>
>>
>>
>>
>>
>

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