Determening the number of clients per KDC

[Sergei Gerasenko]

Hi,

I’m planning an MIT KDC installation for a hadoop cluster consisting of X clients with Y kerberized services each. The KDCs are rather powerful machines with 64 cores and 125G of RAM. I want to get the most out of this hardware and use the mininum number of KDCs required. Is there a rule of thumb for situations like this?

For example, imagining X=300 and Y=10, can/should I run X*Y (3000) workers to accomodate the worst case scenario when they all want to get their tickets? Or can I assume that X*Y/2 will can handle that?

I would appreciate any insights.

Thanks!
  Sergei