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From "Hiller, Dean" <Dean.Hil...@nrel.gov>
Subject Re: About column family
Date Tue, 23 Jul 2013 17:00:03 GMT
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 <rcoli@eventbrite.com<mailto:rcoli@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 <bjbylh@me.com<mailto:bjbylh@me.com>>
Subject: Re: About column family

On Tue, Jul 23, 2013 at 3:23 AM, bjbylh <bjbylh@me.com<mailto:bjbylh@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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