DSE Advanced Replication keyspace overview

Keyspaces and tables are automatically created on the source cluster when DSE Advanced Replication runs for the first time. Two keyspaces are used, dse_system and dse_advrep. Each keyspace is configured differently.

System keyspaces on the source and destination are not supported for advanced replication.

The dse_system keyspace uses the EverywhereStrategy replication strategy by default; this setting must not be altered. The dse_advrep keyspace is configured to use the SimpleStrategy replication strategy by default and this setting must be updated in production environments to avoid data loss. After starting the cluster, alter the keyspace to use the NetworkTopologyStrategy replication strategy with an appropriate settings for the replication factor and datacenters. For example, use a CQL statement to configure a replication factor of 3 on the DC1 datacenter using NetworkTopologyStrategy:

   'class': 'NetworkTopologyStrategy',
   'DC1': '3'};

For most environments using DSE Advanced Replication, a replication factor of 3 is suitable. The strategy must be configured for any datacenters which are serving as an advanced replication source.

nodetool repair must be run on each node of the affected datacenters.

To repair the altered keyspace:

nodetool repair -full dse_advrep

For more information, see Changing keyspace replication strategy.

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