Thans Arun !
On Tue, Apr 28, 2015 at 9:44 AM, arun sirimalla <arunsi...@gmail.com> wrote:
> Hi Neha,
>
>
> After you add the node to the cluster, run nodetool cleanup on all nodes.
> Next running repair on each node will replicate the data. Make sure you
> run the repair on one node at a time, because repair is an expensive
> process (Utilizes high CPU).
>
>
>
>
> On Mon, Apr 27, 2015 at 8:36 PM, Neha Trivedi <nehajtriv...@gmail.com>
> wrote:
>
>> Thanks Eric and Matt :) !!
>>
>> Yes the purpose is to improve reliability.
>> Right now, from our driver we are querying using degradePolicy for
>> reliability.
>>
>>
>>
>> *For changing the keyspace for RF=3, the procedure is as under:*
>> 1. Add a new node to the cluster (new node is not in seed list)
>>
>> 2. ALTER KEYSPACE system_auth WITH REPLICATION =
>> {'class' : 'NetworkTopologyStrategy', 'dc1' : 3};
>>
>>
>> 1. On each affected node, run nodetool repair
>>
>> <http://docs.datastax.com/en/cassandra/1.2/cassandra/tools/toolsNodetool_r.html>.
>>
>> 2. Wait until repair completes on a node, then move to the next node.
>>
>>
>> Any other things to take care?
>>
>> Thanks
>> Regards
>> neha
>>
>>
>> On Mon, Apr 27, 2015 at 9:45 PM, Eric Stevens <migh...@gmail.com> wrote:
>>
>>> It depends on why you're adding a new node. If you're running out of
>>> disk space or IO capacity in your 2 node cluster, then changing RF to 3
>>> will not improve either condition - you'd still be writing all data to all
>>> three nodes.
>>>
>>> However if you're looking to improve reliability, a 2 node RF=2 cluster
>>> cannot have either node offline without losing quorum, while a 3 node RF=3
>>> cluster can have one node offline and still be able to achieve quorum.
>>> RF=3 is a common replication factor because of this characteristic.
>>>
>>> Make sure your new node is not in its own seeds list, or it will not
>>> bootstrap (it will come online immediately and start serving requests).
>>>
>>> On Mon, Apr 27, 2015 at 8:46 AM, Neha Trivedi <nehajtriv...@gmail.com>
>>> wrote:
>>>
>>>> Hi
>>>> We have a 2 Cluster Node with RF=2. We are planing to add a new node.
>>>>
>>>> Should we change RF to 3 in the schema?
>>>> OR Just added a new node with the same RF=2?
>>>>
>>>> Any other Best Practice that we need to take care?
>>>>
>>>> Thanks
>>>> regards
>>>> Neha
>>>>
>>>>
>>>
>>
>
>
> --
> Arun
> Senior Hadoop/Cassandra Engineer
> Cloudwick
>
> Champion of Big Data (Cloudera)
>
> http://www.cloudera.com/content/dev-center/en/home/champions-of-big-data.html
>
> 2014 Data Impact Award Winner (Cloudera)
>
> http://www.cloudera.com/content/cloudera/en/campaign/data-impact-awards.html
>
>
