We use PlayOrm to have 60,000 VIRTUAL column families such that the performance 
is just fine ;).  You may want to try something like that.

Dean

From: Robert Coli <rc...@eventbrite.com<mailto:rc...@eventbrite.com>>
Reply-To: "user@cassandra.apache.org<mailto:user@cassandra.apache.org>" 
<user@cassandra.apache.org<mailto:user@cassandra.apache.org>>
Date: Tuesday, July 23, 2013 10:40 AM
To: "user@cassandra.apache.org<mailto:user@cassandra.apache.org>" 
<user@cassandra.apache.org<mailto:user@cassandra.apache.org>>, bjbylh 
<bjb...@me.com<mailto:bjb...@me.com>>
Subject: Re: About column family

On Tue, Jul 23, 2013 at 3:23 AM, bjbylh <bjb...@me.com<mailto:bjb...@me.com>> 
wrote:
1,how many column families can be created in a cluster?is there a limit to the 
number of it?

Low number of hundreds is highest practical. The limit in practice is amount of 
heap, each CF consumes heap.

2,it spents 2-5 seconds to create a new cf while the cluster contains about 
10000 cfs(if the cluster is empty,it spents about 0.5s).is it normal?how to 
improve the efficiency of creating cf?

Yes, that doesn't seem surprising to me. See above.

=Rob

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