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From Jonathan Ellis <jbel...@gmail.com>
Subject Re: Replication Factor and Data Centers
Date Tue, 15 Jun 2010 17:51:28 GMT
(moving to user@)

On Mon, Jun 14, 2010 at 10:43 PM, Masood Mortazavi
<masoodmortazavi@gmail.com> wrote:
> Is the clearer interpretation of this statement (in
> conf/datacenters.properties) given anywhere else?
>
> # The sum of all the datacenter replication factor values should equal
> # the replication factor of the keyspace (i.e. sum(dc_rf) = RF)
>
> # keyspace\:datacenter=replication factor
> Keyspace1\:DC1=3
> Keyspace1\:DC2=2
> Keyspace1\:DC3=1
>
> Does the above example configuration imply that Keyspace1 has a RF of 6, and
> that of these 3 will go to DC1, 2 to DC2 and 1 to DC3?

Yes.

> What will happen if datacenters.properties and cassandra-rack.properties are
> simply empty?

You have an illegal configuration.
https://issues.apache.org/jira/browse/CASSANDRA-1191 is open to have
Cassandra raise an error under this condition and others.

-- 
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support
http://riptano.com

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