DatacenterShardStrategy needs enforceable and keyspace based RF
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Key: CASSANDRA-1066
URL: https://issues.apache.org/jira/browse/CASSANDRA-1066
Project: Cassandra
Issue Type: Improvement
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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