Re: Cassandra add a node and remove a node

2014-12-02 Thread Neha Trivedi 
Thanks Jens and Robert !!!

On Wed, Dec 3, 2014 at 2:20 AM, Robert Coli  wrote:

> On Mon, Dec 1, 2014 at 7:10 PM, Neha Trivedi 
> wrote:
>
>> No the old node is not defective. We Just want to separate out that
>> Server for testing.
>> And add a new node. (Present cluster has two Nodes and RF=2)
>>
>
> If you currently have two nodes and RF=2, you must add the new node before
> removing the old node, so that you always have at least two nodes in the
> cluster.
>
> =Rob
>
>

Re: Cassandra add a node and remove a node

2014-12-02 Thread Robert Coli 
On Mon, Dec 1, 2014 at 7:10 PM, Neha Trivedi  wrote:

> No the old node is not defective. We Just want to separate out that Server
> for testing.
> And add a new node. (Present cluster has two Nodes and RF=2)
>

If you currently have two nodes and RF=2, you must add the new node before
removing the old node, so that you always have at least two nodes in the
cluster.

=Rob

Re: Cassandra add a node and remove a node

2014-12-01 Thread Neha Trivedi 
No the old node is not defective. We Just want to separate out that Server
for testing.
And add a new node. (Present cluster has two Nodes and RF=2)

thanks

On Tue, Dec 2, 2014 at 12:04 AM, Robert Coli  wrote:

> On Sun, Nov 30, 2014 at 10:15 PM, Neha Trivedi 
> wrote:
>
>> I need to Add new Node and remove existing node.
>>
>
> What is the purpose of this action? Is the old node defective, and being
> replaced 1:1 with the new node?
>
> =Rob
>
>

Re: Cassandra add a node and remove a node

2014-12-01 Thread Robert Coli 
On Sun, Nov 30, 2014 at 10:15 PM, Neha Trivedi 
wrote:

> I need to Add new Node and remove existing node.
>

What is the purpose of this action? Is the old node defective, and being
replaced 1:1 with the new node?

=Rob

Re: Cassandra add a node and remove a node

2014-11-30 Thread Jens Rantil 
Hi Neha,




Generally best practice is to add the new node before removing the old one. 
This is especially important if the cluster’s resources (such as available disk 
space) are low. Also, adding a node usually asserts that the node is 
functioning correctly (check logs) before decommisioning the old node. See [1].




[1] 
http://www.datastax.com/documentation/cassandra/2.0/cassandra/operations/ops_replace_live_node.html




Cheers,

Jens




———
Jens Rantil
Backend engineer
Tink AB

Email: jens.ran...@tink.se
Phone: +46 708 84 18 32
Web: www.tink.se

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On Mon, Dec 1, 2014 at 7:15 AM, Neha Trivedi 
wrote:

> Hi,
> I need to Add new Node and remove existing node.
> Should I first remove the node and then add a new node or Add new node and
> then remove existing node.
> Which practice is better and things I need to take care?
> regards
> Neha

Cassandra add a node and remove a node

2014-11-30 Thread Neha Trivedi 
Hi,
I need to Add new Node and remove existing node.

Should I first remove the node and then add a new node or Add new node and
then remove existing node.
Which practice is better and things I need to take care?

regards
Neha