On Tue, May 31, 2011 at 2:50 PM, W.P. McNeill <[email protected]> wrote:
> I'm launching long-running tasks on a cluster running the Fair Scheduler.
> As I understand it, the Fair Scheduler is preemptive. What I expect to see
> is that my long-running jobs sometimes get killed to make room for other
> people's jobs. This never happens instead my long-running jobs hog mapper
> and reducer slots and starve other people out.
>
> Am I misunderstanding how the Fair Scheduler works?
>
Try adding
<minSharePreemptionTimeout>120</minSharePreemptionTimeout>
<fairSharePreemptionTimeout>180</fairSharePreemptionTimeout>
To one of your pools and see if that pool pre-empts other pools
