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From Edward Capriolo <>
Subject Re: 10,000s of column families/keyspaces
Date Mon, 01 Jul 2013 20:49:39 GMT
There is another problem. You now need to run repair for a large number of
column families and keyspaces and manage that, look out for schema
mismatches etc.

On Mon, Jul 1, 2013 at 4:09 PM, Robert Coli <> wrote:

> On Mon, Jul 1, 2013 at 9:19 AM, Kirk True <> wrote:
>> What will it take for C* to support 50,000 column families?
> As I understand it, a (the?) big problem with huge numbers of Column
> Families is that each ColumnFamily has a large number of MBeans associated
> with it, each of which consume heap. So.. a lot fewer MBeans per column
> family and/or MBean stuff not consuming heap? Then you still have the
> problem of each CF having at least one live Memtable, which even if empty
> will still consume heap...
> I'm thinking the real answer to "what it will take for C* to support 50k
> CFs" is "a JVM which can functionally support heap sizes over 8gb" ...
> which seems unlikely to happen any time soon.
> =Rob

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