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https://issues.apache.org/jira/browse/CASSANDRA-1066?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12865337#action_12865337
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Jeremy Hanna commented on CASSANDRA-1066:
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One solution could be to push the replication factor back to the strategy by a
method to get the replication factor there. That way it could be more
flexible/customizable.
> DatacenterShardStrategy needs enforceable and keyspace based RF
> ---------------------------------------------------------------
>
> Key: CASSANDRA-1066
> URL: https://issues.apache.org/jira/browse/CASSANDRA-1066
> Project: Cassandra
> Issue Type: Improvement
> Affects Versions: 0.7
> Reporter: Jeremy Hanna
> Priority: Minor
>
> Currently, the DatacenterShardStrategy reads in a properties file -
> datacenters.properties - to get a per-datacenter replication factor. So any
> keyspace that is using the DSS in the cluster is using that same properties
> file to configure its replication factor. The implementation doesn't take
> into account the per-keyspace replication factor, but it is assumed that the
> sum of all the datacenter RF values equals the per-keyspace replication value
> that is part of the keyspace metadata.
> It seems that an improvement could be two-fold:
> 1. Enforce the replication factor for the keyspace as always equal the sum of
> all the datacenter RF values. Otherwise, if they aren't equal, bad things
> (tm) can happen.
> 2. Make the datacenter RF values part of the keyspace metadata rather than a
> global value. Again, currently if any keyspace in the cluster is configured
> to use DSS, it will be using the global DC RF values found in the properties
> file. An improvement could be to instead of having the properties file,
> configure that on a per keyspace basis. That would make the cluster more
> multi-tenant friendly so it could be flexible with multiple keyspaces.
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