> > I have some questions about running hadoop on top of Mesos, please help me. > 1. when a tasktracker is launched, if n cpu core are allocated to it, it > can only launch n-1 map tasks. Could someone tell me why? And, if I want to > run map-only job, what should I do to run n map tasks on a n cpu resource > offer? >
This is because 1 cpu is allocated to the task tracker itself. > 2. After a tasktracker is launched, in what condition it's status will > update to FINISHED? > In my cluster, sometimes it will never end until I restart the jobtracker. > Sometimes it will end if there is no task or job in jobtracker to run. > The expected case is that the task tracker is finished/killed if there is no task/job assigned to it. If there is an idle task tracker for a long time it's probably a bug (@brenden can correct me if the semantics have changed around this). Some logs would help diagnose the issue. > 3. How to use DRF with weight? I run two frameworks on mesos, and I want > to give them different proportion of resources. > > Give each framework a different role (FrameworkInfo.role) and give weights to each role via master command line flags (see --roles and --weights via ./master --help). > Please help me! > Thank you very much! > > >
