What Devaraj said. Except that if you use CapacityScheduler, then you can bind together memory requests and slot concepts, and be able to have a task grab more than one slot for itself when needed. We've discussed this aspect previously at http://search-hadoop.com/m/gnFs91yIg1e
On Thu, Aug 8, 2013 at 8:34 AM, Devaraj k <devara...@huawei.com> wrote: > One task can use only one slot, It cannot use more than one slot. If the > task is Map task then it will use one map slot and if the task is reduce > task the it will use one reduce slot from the configured ones. > > > > Thanks > > Devaraj k > > > > From: Azuryy Yu [mailto:azury...@gmail.com] > Sent: 08 August 2013 08:27 > To: user@hadoop.apache.org > Subject: Re: specify Mapred tasks and slots > > > > My question is can I specify how many slots to be used for each M/R task? > > > > On Thu, Aug 8, 2013 at 10:29 AM, Shekhar Sharma <shekhar2...@gmail.com> > wrote: > > Slots are decided upon the configuration of machines, RAM etc... > > > Regards, > > Som Shekhar Sharma > > +91-8197243810 > > > > On Thu, Aug 8, 2013 at 7:19 AM, Azuryy Yu <azury...@gmail.com> wrote: > > Hi Dears, > > > > Can I specify how many slots to use for reduce? > > > > I know we can specify reduces tasks, but is there one task occupy one slot? > > > > it it possible that one tak occupy more than one slot in Hadoop-1.1.2. > > > > Thanks. > > > > -- Harsh J
