KeyspaceDefinition keyspace = cluster.describeKeyspace(ks);
if(keyspace != null){
LOG.warn("Keyspace {} already exists.", ks);
} else{
LOG.warn("Creating keyspace '{}'", ks);
KeyspaceDefinition ksDef = cluster.makeKeyspaceDefinition();
Map<String, String> stratOptions = new HashMap<String, String>();
stratOptions.put("replication_factor", "1");
ksDef.setName(ks)
.setStrategyClass("SimpleStrategy")
.setStrategyOptions(stratOptions);