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From Sunil Khedar <>
Subject Re: How to check if nodes are added in ring or not?
Date Tue, 15 Dec 2009 07:04:37 GMT
Hey Ramzi,

Another related concern is regarding "ListenAddress". In order to allow
multiple DCs, I have to use the Public IP address of each instance.

1) But when I try to use the Public IP of instance, I get the error below.
But I am able to ping nodes using Public IP address (machines are accessible
using Public IP in same DC). Can you please let me know how to configure it? Cannot assign requested address
        at Method)

2) When I using External URL (associate with the external IP address).
Cassandra associate the 7000 and 7001 ports with the private IP address of
that instance.

The best optimal solution is it should use the Private (internal) IP address
for same DC nodes and Public IP address for nodes in other DCs, so that
network latency can be minimized.

Please suggest how it can be achieved?


Sr. Software Architect
Center of Excellence (COE)
True Sparrow Systems
On Mon, Dec 14, 2009 at 9:51 PM, Ramzi Rabah <> wrote:

> 1- Make sure the ports that cassandra uses by default are open (7000,
> 7001, 9160)
> 2- the new command is nodeprobe ring
> On Mon, Dec 14, 2009 at 6:59 AM, Sharief <> wrote:
> > Hi All,
> >
> > I am installing Cassandra on EC2 instances. My goal is to have nodes in
> > different data-centers. I have setup the storage configuration with
> public
> > IP addresses of instances. The problem is:
> >
> > 1) I'm not able to use these public IP address of instances.
> > 2) Also nodeprobe "cluster" is removed in 0.5. Can you please suggest how
> to
> > check if nodes are added in ring or not?
> >
> > Thanks
> > Sharief
> >

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