Have you seen this thread ?
On Mon, Jul 29, 2013 at 2:19 PM, Sudarshan Kadambi (BLOOMBERG/ 731 LEXIN) <
[EMAIL PROTECTED]> wrote:
> If someone was contemplating running multiple HBase region servers per
> node, what would you tell him? I've lots of RAM on my machines and I want
> HBase to be able to make the most of it. Heaps larger than 12-16G have
> significant gc penalties. I could try to have a larger cache off-heap, but
> that feature is considered to be not fully baked in yet (according to
> people in the know). The option left over is to run multiple region servers
> per node. What are the downsides to that?