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From Arun Sandu <arunsandu...@gmail.com>
Subject Re: Snitch for AWS EC2 nondefaultVPC
Date Wed, 02 Mar 2016 15:15:49 GMT
Thanks Asher.

Yes, I agree. It would be better if someone can help us with clear
documentation about this.

As the cross data communication is through private IP, I would consider
updating braodcast_address to private IP and use Ec2MultiRegionSnitch.

On Tue, Mar 1, 2016 at 3:26 PM, Asher Newcomer <ashernew@gmail.com> wrote:

> Hi Arun,
>
> This distinction has been a can of worms for me also - and I'm not sure my
> understanding is entirely correct.
>
> I use GossipingPropertyFileSnitch for my multi-region setup, which seems
> to be more flexible than the Ec2 snitches. The Ec2 snitches should work
> also, but their behavior is more opaque from my perspective.
>
> AFAIK - if all of your nodes can reach each other via private IP, and your
> anticipated clients can reach all nodes via their private IP, then using
> the private IP address as the broadcast_address is fine.
>
> If there will ever be a situation where a client or node will need to
> reach some part of the cluster using public IPs, then public IPs should be
> used as the broadcast_address.
>
> A simple flow-chart / diagram of how these various settings are used by
> Cassandra would be very helpful for people new to the project.
>
> Regards,
>
> Asher
>
> On Tue, Mar 1, 2016 at 3:12 PM, Arun Sandu <arunsandu666@gmail.com> wrote:
>
>> Hi all,
>>
>> All our nodes are launched in AWS EC2 VPC (private). We have 2
>> datacenters(1 us-east , 1- asiapacific) and all communication is through
>> private IP's and don't have any public IPs. What is the recommended snitch
>> to be used? We currently have GossipingPropertyFileSnitch.
>>
>> 1. If Ec2MultiRegionSnitch, then what would be the broadcast_address?
>> 2. If not Ec2MultiRegionSnitch, which snitch better fits this environment?
>>
>> *Ref:*
>> As per the document Ec2MultiRegionSnitch
>> <http://docs.datastax.com/en/cassandra/2.1/cassandra/architecture/architectureSnitchEC2MultiRegion_c.html>,set
>> the listen_address
>> <http://docs.datastax.com/en/cassandra/2.1/cassandra/configuration/configCassandra_yaml_r.html#reference_ds_qfg_n1r_1k__listen_address>
>> to the *private* IP address of the node, and the broadcast_address
>> <http://docs.datastax.com/en/cassandra/2.1/cassandra/configuration/configCassandra_yaml_r.html#reference_ds_qfg_n1r_1k__broadcast_address>
>> to the *public* IP address of the node.
>>
>> --
>> Thanks
>> Arun
>>
>
>


-- 
Thanks
Arun

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