I would recommend you utilise Cassandra’s Vnodes config and let it manage this itself.
This means it will create these and a mange them all on its own and allows quick and easy scaling and boot strapping. From: Björn Hachmann <[email protected]<mailto:[email protected]>> Reply-To: "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>> Date: Friday, 27 March 2015 10:40 To: user <[email protected]<mailto:[email protected]>> Subject: Replication to second data center with different number of nodes Hi, we currently plan to add a second data center to our Cassandra-Cluster. I have read about this procedure in the documentation (eg. https://www.datastax.com/documentation/cassandra/2.1/cassandra/operations/ops_add_dc_to_cluster_t.html), but at least one question remains: Do I have to provide appropriate values for num_tokens dependent on the number of nodes per data center, or is this handled somehow by the NetworkTopologyStrategy? Example: We currently have 12 nodes each covering 256 tokens. Our second datacenter will have three nodes only. Do I have to set num_tokens to 1024 (12*256/3) for the nodes in that DC? Thank you very much for your valuable input! Kind regards Björn Hachmann Information in this email including any attachments may be privileged, confidential and is intended exclusively for the addressee. The views expressed may not be official policy, but the personal views of the originator. If you have received it in error, please notify the sender by return e-mail and delete it from your system. You should not reproduce, distribute, store, retransmit, use or disclose its contents to anyone. Please note we reserve the right to monitor all e-mail communication through our internal and external networks. SKY and the SKY marks are trademarks of Sky plc and Sky International AG and are used under licence. Sky UK Limited (Registration No. 2906991), Sky-In-Home Service Limited (Registration No. 2067075) and Sky Subscribers Services Limited (Registration No. 2340150) are direct or indirect subsidiaries of Sky plc (Registration No. 2247735). All of the companies mentioned in this paragraph are incorporated in England and Wales and share the same registered office at Grant Way, Isleworth, Middlesex TW7 5QD.
