Determening the number of clients per KDC

2018-04-15 Thread 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

Re: Determening the number of clients per KDC

2018-04-15 Thread Sergei Gerasenko
:13 PM, Russ Allbery wrote: > > Sergei Gerasenko writes: > >> 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 th

Re: Determening the number of clients per KDC

2018-04-16 Thread Sergei Gerasenko
Hi Russ, Since I don’t know too much about the KDC architecture, sorry for the dilettante questions. > It's unfortunately been long enough since I've tested this on a system > running flat out that I don't remember what qps a KDC can do on modern > hardware, but I would expect it to at least be

Re: Determening the number of clients per KDC

2018-04-16 Thread Sergei Gerasenko
> Oh, no problem -- just be aware that they're being answered by someone who > hasn't run large-scale KDCs in about four years, so some of my information > is stale. :) Still very valuable since I haven’t been able to find answers to any of these questions elsewhere. > If you're doing default K

Re: Determening the number of clients per KDC

2018-04-17 Thread Sergei Gerasenko
Thank you so much for confirming that the KDCs are fast. This saved me a ton of time writing my own tests, etc. Andrew, as far as workers, is it one worker per core in general as Russ theorized? Otherwise, I think I’m all set for now. Thanks!! > On Apr 16, 2018, at 8:41 PM, Russ Allbery wrote

Re: Determening the number of clients per KDC

2018-04-17 Thread Sergei Gerasenko
> On Apr 17, 2018, at 5:20 PM, Russ Allbery wrote: > > Mark Pröhl writes: >> On 04/16/2018 05:51 PM, Russ Allbery wrote: > >>> ... Clients aren't going to generally all try to get a ticket at the >>> same time, due to ticket caching, so that scales to a lot of clients. > >> I have only seen J