Comments - Cassandra Storage Engine Use Example
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Apparently the syntax for creating namespaces in Cassandra changed since this article was written three years ago.
Some of the other responses here tell you how to use the old syntax using various options when starting cqlsh.
Here's the updated equivalent command, with Cassandra 3.7 | CQL spec 3.4.2:
CREATE KEYSPACE mariadbtest2 WITH replication = {'class': 'SimpleStrategy', 'replication_factor': 1} AND durable_writes = true;