Execution of DDL statements could lead to the schema disagreement in Cassandra

When executing DDL statements (CREATE/ALTER/DROP) it's possible get schema disagreement in Cassandra, especially for big/geo-distributed clusters. Java drivers has a special handling of such statements, with increased timeout, but it's still possible that next DDL statement will be executed before all nodes agree on the schema version, and this could lead to schema disagreement that need to be resolved by administrators.