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What is the maximum number of keyspaces allowed in a Cassandra cluster? The wiki page on limitations doesn't mention one. Is there such a limit?
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A keyspace is basically just a Map entry to Cassandra... you can have as many as you have memory for. Millions, easily.
ColumnFamilies are more expensive, since Cassandra will reserve a minimum of 1MB for each CF's memtable: http://www.datastax.com/dev/blog/whats-new-in-cassandra-1-0-performance
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