http://www.datastax.com/documentation/cassandra/2.0/cassandra/configuration/configCassandra_yaml_r.html?scroll=reference_ds_qfg_n1r_1k__num_tokens
So go with a default 256, and leave initial token empty: num_tokens: 256 # initial_token: Cassandra will always give each node the same number of tokens, the only time you might want to distribute this is if your instances are of different sizing/capability which is also a bad scenario. From: Björn Hachmann <bjoern.hachm...@metrigo.de<mailto:bjoern.hachm...@metrigo.de>> Reply-To: "user@cassandra.apache.org<mailto:user@cassandra.apache.org>" <user@cassandra.apache.org<mailto:user@cassandra.apache.org>> Date: Friday, 27 March 2015 12:11 To: user <user@cassandra.apache.org<mailto:user@cassandra.apache.org>> Subject: Re: Replication to second data center with different number of nodes 2015-03-27 11:58 GMT+01:00 Sibbald, Charles <charles.sibb...@bskyb.com<mailto:charles.sibb...@bskyb.com>>: Cassandra’s Vnodes config Thank you. Yes, we are using vnodes! The num_token parameter controls the number of vnodes assigned to a specific node. Might be I am seeing problems where are none. Let me rephrase my question: How does Cassandra know it has to replicate 1/3 of all keys to each single node in the second DC? I can see two ways: 1. It has to be configured explicitly. 2. It is derived from the number of nodes available in the data center at the time `nodetool rebuild` is started. Kind regards Björn 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.
