incubator-cassandra-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Robert Coli <rc...@eventbrite.com>
Subject Re: Heap requirement for Off-heap space
Date Fri, 11 Oct 2013 20:06:14 GMT
On Fri, Oct 11, 2013 at 5:47 AM, Artur Kronenberg <
artur.kronenberg@openmarket.com> wrote:

> I was playing around with cassandra off-heap options. I configured 3 GB
> off-heap for my row cache and 2 GB Heap space for cassandra.
>

The row cache is only really useful in very specific cases involving very
small, hot, and uniform in size datasets. Many more people have shot
themselves in the foot by using it than have had great success.

The off-heap row cache also invalidates on UPDATE, which is significantly
different from what many people expect.


> Is there a formula that maps heap space to off-heap?


FWIW, I'd also like to know the answer to this question.

=Rob

Mime
View raw message