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From Paulo Motta <pauloricard...@gmail.com>
Subject Re: Preferred IP is NULL
Date Mon, 22 Aug 2016 13:39:40 GMT
What snitch are you using? If GPFS you need to enable the prefer_local=true
flag (this is automatic on EC2MRS).

2016-08-21 22:24 GMT-03:00 Anuj Wadehra <anujw_2003@yahoo.co.in>:

> Hi Paulo,
>
> I am aware of CASSANDRA-9748. It says that Cassandra only listens at
> listen_address and not broadcast_address. To overcome that I can add a NAT
> rule to route all traffiic on public IP to private IP.
>
> But, why preferred IP is set to null in peers table? Whats the expected
> value?
>
> Even if I add a NAT rule as workaround for CASSANDRA-9748, what if my
> public interface is down on a node? My traffic would still fail.
>
> I want that at least nodes in my local DC should contact at each other on
> private IP. I thought preferred IP is for that purpose so focussing on
> fixing the null value of preferred IPs.
>
>
> Thanks
> Anuj
>
>
> On Sun, 21 Aug, 2016 at 7:10 PM, Paulo Motta
> <pauloricardomg@gmail.com> wrote:
> See CASSANDRA-9748, I think it might be related.
>
> 2016-08-20 15:20 GMT-03:00 Anuj Wadehra <anujw_2003@yahoo.co.in>:
>
>> Hi,
>>
>> We use multiple interfaces in multi DC setup.Broadcast address is public
>> IP while listen address is private IP.
>>
>> I dont understand why prefeerred IP in peers table is null for all rows.
>>
>> There is very little documentation on the role of preferred IP and when
>> it is set. As per code TCP connections use preferred IP. According to my
>> understanding, nodes in local dc should use preferrably private IP to
>> connect and that's referred as preferred IP for a node.
>>
>> Setup: Cassandra 2.0.14
>>
>> Thanks
>> Anuj
>>
>>
>>
>

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