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From John Wong <>
Subject Re: Need advice for multi DC C* setup
Date Sun, 16 Aug 2015 04:34:06 GMT
> The EC2 nodes must be in the default VPC.
Did you really mean the default VPC created by AWS or just a VPC? Because I
would be very surprise default VPC must be used.

On Sat, Aug 15, 2015 at 2:50 AM, Prem Yadav <> wrote:

> The EC2 nodes must be in the default VPC.
> create a ring in the VPC in region B. Use VPC peering to connect the
> default and the region B VPC.
> The two rings should join the existing one. Alter the replication strategy
> to network replication so that the data is replicated to the new rings.
> Repair the keyspaces.
> Once it is done, you can decommission the existing ring.
> For spark,if you are using datastax version, it comes with spark. You just
> need to change a config and spark starts along with cassandra. A separate
> ring is advised for analytics stuff.
> On Sat, Aug 15, 2015 at 1:10 AM, Aiman Parvaiz <>
> wrote:
>> Hi all
>> We are planning to move C* from EC2 (region A) to VPC in region B. I will
>> enumerate our goals so that you guys can advice me keeping in mind the
>> bigger picture.
>> Goals:
>> - Move to VPC is another region.
>> - Enable Vnodes.
>> - Bump up RF to 3.
>> - Ability to have a spark cluster.
>> I know this is a LOT of work and I know this all might not be possible in
>> one go.
>> Existing cluster in EC2 is using RF=2, simple snitch and simple
>> replication.
>> I am not sure what would be the best way to approach this task. So please
>> anyone who has done this and would like to share anything I would really
>> appreciate the effort.
>> Thanks

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